CONTENTS[Chinese] |
| Discussion on velocity solution of slip
line theory for geotechnical materials-the application of generalized |
ZHENG Ying-ren,WANG
Jing-lin,ZHU Xiao-kang |
| Application of self-organization feature
maps to analysis of aquatic data |
CHEN Qiu-wen |
| Application of single parent genetic
algorithm for optimization of tree pipe network layout |
ZHOU Rong-min,LIN
Xing-cui |
| Numerical simulation of meso-level
mechanical properties of roller compacted concrete |
PENG Yi-jiang,LI
Bao-kun,LIU Bin |
| The ground deformations in Kezier
Reservior before and after impounding |
YANG Zhi-rong,AN
Jing-sheng,ZHANG Hong-ke,TAO Mao-song |
| 3-D FEM analysis for surrounding concrete
of steel spiral case keeping constant internal pressure |
QIN Jin-zhang,MA
Shan-ding,WU He-gao,KUANG Hui-jian |
| Finite element algorithm for 3-D
unconfined seepage flow field |
HUANG Wei,LIU
Ying-xi,ZHOU Cheng-fang |
| Study on exploitation and protection of
groundwater in Northwestern China |
GUO Zhan-rong,LIU
Hua-tai,ZHU Yan-hua |
| Relationship between RCC permeability
coefficients of indoor experiment and from water pressure test in situ |
HU YUN-jin,SU
Bao-yu,ZHAN Mei-li,ZHANG Zhu-tian |
| Study on computation of crop transpiration
under the conditions of different light densities |
LIU Xian-zhao,KANG
Shao-zhong |
| Incipient motion of cohesive silt in the HaiHe River
estuary |
JIANG Chang-bo,BAI
Yu-chuan,JIANG Nai-shen,HU Shi-xiong |
| 3-D calcucation of gas-oil flow in
rotodynamic pump based on a bubbly flow model |
HUANG Si,WU Yu-lin |
| Application and improvement of soil
resistance coefficient in numerical analysis of cylinder shell with large diameter |
ZHOU Xi-reng,PAN
Hou-zhi |
| Neural network of phase space and its
application in dam safety monitoring |
XU Hong-zhong,WU
Zhong-ru,LI Xue-hong |
| The parabolic mild-slope equation for irregular waves |
LIN Gang |
| The
effects of feinforcement on strength and deformation of soil-gravel material |
BAO Hua-fu,GONG Tao |
| Numerical solution of water hammer due to
pumping interruption using direct alternative format |
XIE Shui-bo,QIU
Chang-jun,CHEN Shen-bing,LI Bu-xin |
| Study on silting at the entrance of ship lock approach |
LIU Xiao-ping,XIE
Li-fang,JIANG Chang-bo |
| Salted soil and its development in
Northwest China |
WANG Lin,GAN Hong,YU
Fu-liang,WANG Shan |
Discussion on velocity solution of slip line theory for
geotechnical materials
—the application of generalized
plastic theory
ZHENG Ying-ren, WANG Jing-lin,
ZHU Xiao-kang
(Logistic Engineering Unviersity)
Abstract:The slip line
theory based on the associated flow rule for traditional plastic theory is not accord with
the experiment for geotechnical material and the stress characteristic line is not
coincide with the velocity line。It is proved that
the plastic potential surface intersects the M-C yield surface with an angle, so that the
velocity line must be studied by non-associated flow rule. In this paper, the generalized
plastic mechanics is briefly introduced and the generalized plastic potential formula with
three plastic potential functions is given. The yield surfaces are related to the plastic
potential surfaces, but it does not means that they are always the same. The velocity slip
line equations based on the generalized plastic mechanics(non-associated flow rule) are
derived, which are independent of the M-C yield condition. Whereas, the stress
characteristic line equation is always related to the M-C yield condition. The angle
between the velocity line and the stress characteristic line is φ/2 atevery point of intersection. The Prandtl solution of the
flat-roofed obtuse wedge is used as an example for illustration.
Key words:slip line;
stress characteristic line; velocity slip line; non-associated flow rule
Application of self organization feature maps to analysis
of aquatic data
CHEN Qiu wen
(Delft Hydraulics)
Abstract:The paper
describes the application of self organization feature maps(SOFM)such as Kohonen networks
to the analysis of spatial temporal patterns of eutrophication in Taihu Lake and the main
forcing dynamics.General aspects of SOFM are presented and a real case study on the
eutrophication data anlysis is carried out to detail the procedure of application.Some
preliminary ideas for further study are also presented for discussion.
Key
words:SOFM,Kohonen networks;aquatic data;Taihu Lake;eutrophication
Application of single parent genetic algorithm for optimization of
tree pipe network layout
ZHOU Rong-min1, LIN
Xing-Cui2
(1.Zhengzhou University 2.Northwest Science & Technology
University of Agriculture & Forestry, Yangling)
Abstract:Based on the
graphic theory and genetic algorithm an improved genetic algorithm, namely single parent
genetic algorithm(SPGA), is introducedto optimize the tree pipe network layout. The
corresponding fitness function, single parent transposition operator and single parent
reverse operator are designed. In comparison with the Dijkstra algorithm and Kruskal
algorithm the SPGA uses the minimal cost of pipe network as the optimal layout objective,
so that a set of tree pipe network layout with minimal cost can be acquired. Furthermore,
the SPGA possesses the advantages of high searching efficiency, quick convergenceand good
stability.
Key words:single parent
genetic algorithms; tree pipe network; optimal layout
Numerical simulation of meso-level mechanical properties
of roller compacted concrete
PENG
Yi-jiang1, LI Bao-kun1, LIU Bin1
(Graduate School,North China Institute of Water Conservancey and Electric Power)
Abstract:The
RCC is taken as a two-phae composite material consisting of mortar matrix (including
cement and fly ash),aggregate and bonds between matrix and aggregate on meso-level.This
random aggregate model is used to simulate the structure of RCC.The propagation process of
cracks and the mechanical properties of RCC in split specimens are simulated using FEM.The
simulation result agrees well with the experimental data.
Key words:meso-level;
compostite material; random aggregate model; FEM; fracture mechanism; strength
The ground deformations in Kezier Reservior before and after
impounding
YANG
Zhi-rong1, AN Jing-sheng2, ZHANG Hong-ke1 , TAO Mao-song2
(1.Seismological Bureau of Xinjiang Urgur Autonomous Region 2.Administration
Bureau of Kezier Reservoir)
Abstract:The
Kezier Reservoir is located at the region of active geological fault.After impounding,the
observation data show taht abnormal deformation of the fault is happened.The least square
method is applied to study the deformation tendency and calculate the mean annual rate of
deformation.It is found that the deformation variation is closely correlated to the
excavation of rock mass,filling of the damduring construction as well as the water loading
due to impounding.Other factorsincluding the hydro-geological condition,ground stress
status and pore stress has also affected the deformation.
Key words:Kzier
Reservir; dam construction; ground deformation observation
3－D FEM analysis for
surrounding concrete of steel spiral
case keeping constant internal pressure
QIN Jin
zhang1, MA Shan ding1, WU He gao1, KUANG Hui jian2
(1.Wuhan University of Hydraulic and Electric Engieering, Wuhan
2.Construction and Management
Bureau of Feilaixia Project)
Abstract：The calculation result of 3 D FEM analysis for spiral casestructure
of the Three Gorges Project, under the condition of keeping constant internal pressure, is
presented. It is shown that the adoption of keeping constant internal pressure during
placement of concrete encasement of steel spiral case is feasible. The suitable internal
pressure is ranging from 78 88m. Since themaximum stress in various sections is dependent
of the combination of differentloads, the reinforcement of the surrounding concrete must
be carefully considered in design.
Key
words：spiral case；surrounding concrete; keeping constant internal pressure；calculation method; FEM analysis
Finite element algorithm for 3 D unconfined seepage flow field
HUANG Wei1,
LIU Ying xi2, ZHOU Cheng fang2
(1.Wenzhou University 2.Dalian University of Technology)
Abstract：Based on the iteration of adjusted conductivity matrix of element
intersected at free surface, a new finite element algorithm called abandoned element
method is developed. The effectiveness of this method is verified bythe comparisons of
calculation results with analytic solution and other algorithms. It was applied to the
seepage analysis of the dam in Fengmang Hydro Project having complicated drainage system.
The analysis result is in good agreement withobservation data.
Key
words：free
surface；seepage flow; FEM; abandoned element
Study on exploitation and protection of groundwater in Northwestern
China
GUO Zhan
rong, LIU Hua tai, ZHU Yan hua
(Institute of Hydrogeology and Environmental Geology)
Abstract：On the basis of analysis on the space and temporal distribution
characteristics of water resources, present situation of exploitation and utilization of
groundwater and the eco environmental problems occurred, suggestionon reasonable
exploitation and utilization of water resources have been made. the content of suggestion
includes reasonably increasing the extraction of groundwater, making full use of the
control function of groundwater to eco environment, carrying out the water resources
utilization and eco environmental protectionsimultaneously, elevating the utilization rate
of water resources, combining theutilization with conservation of water resources and
enhancing the survey and investigation of groundwater.
Key
words：groundwater；utilization；protection;
suggestions; Northwestern China
Relationship between RCC permeability coefficients of indoor
experiment and from water pressure test in situ
HU Yun-jin,SU
Bao-yu, ZHAN Mei-li, ZHANG Zhu-tian
(1.Hohai University)
Abstract:
The permeability coefficients for two-grade and three-grade aggregate RCC of indoor
experiment and from water pressure test in situ are statistically analyzed. According to
the accumulated probability curve the permeability coefficients with 6 kinds of guarantee
rate both for indoor experiment andtest in situ are derived and linear relationship is
found by using least squaremethod. On the basis of this linear relationship, the
coefficient from water pressure test can be predicted according to the experment.
Key words:
RCC；indoor experiment;
water pressure test; premeability;linear correelation
Study on computation of crop transpiration under the
conditions of different light densities
LIU
Xian-zhao1, KANG Shao-zhong2
(1.Institute of Soil and Water Conservation，
2.Northwest Agriculture Science
and Technology University of Agriculture and Forestry)
Abstract:Based
on the Penman-Monteith energy conservation, the relation between the ratio of canopy
resistance to aerodynamic resistance and the ratio of introduce critical resistance to
aerodynamic resistance is established. A simple method for computing crop transpiration
under different light densities is attained according to climatological paramenters. The
theoretical analysis andexample show that the method is valid and applicable in estimating
crop transpiration. Daily course of crop transpiration shows that the transpiration may
increase after shading regime at noon in summer.
Key
words:transpiration；different light
densitioes; Penman-Monteithformula; cotton
Incipient motion of cohesive silt in the Haihe River
estuary
JIANG
Chang-bo1, BAI Yu-chuan1, JIANG Nai-shen1, HU Shi-xiong2
(1.Tianjin University, 2International Research and Training Center on Erosion and
Sedimentation)
Abstract：The characteristics and incipient law of cohesive sediment are
experimentally studied.The samples are taken from the downstream ofthe tidal gate in Haihe
River estuary.The experimental and calculation results show that the incipient of the
sediment obeys the Shiled theory and can be described by the extended Shiled′s curve.
Key
words：incipient velocity; Shiled′s curve; cohesive sediment
3-D calcucation of gas-oil flow in rotodynamic pump based on a
bubbly flow model
HUANG Si1,
WU Yu-lin2
(1.University of Petroleum，2.Tsinghua University)
Abstract:A
3-D numerical method is proposed on the basis of a bubblyflow model, in order to simulate
the behavior of gas-oil flow in a rotodynamicpump impeller.In the model,the two-phase flow
prediction technique is an iterative method composed of two parts.The first is the
calcucation of continuous-phase(liquid)velocity field assuming that the distribution of
gas void fraction is given.For the 3-D numerical solution of the liquid governing
equations,a procedure called stream-surface coordinate iteration is adopted.The second is
the calculation of dispersed-phase(bubble)trajectories when the liquid flow field is
known.Governing factors for the bubble motion are the force due to the pressure
gradient,the drag force due to the flow resistance of the surrounding liquid and the
inertia force due to virtue mass of liquid.The equation of motion of gas bubbles are
solved numerically to obtained the gas void fraction.These calculationsare iterated to get
a convergent solution.This method is applied to the calculation of multi-stage
helico-axial booster-pump impellers.It is found that the trajectories of gas bubbles do
not considerably deviate from the path of liquidin blade-to-blade surfaces.In
hub-to-shroud surfaces,however,almost all bubbles are finally shifted toward hub of
impeller no matter where they initially were.
Key words:gas-liquid
two-phase flow boosting;rotodynamic pump;3-D numerical method
Application and improvement of soil resistance coefficient
in numerical analysis of cylinder shell with large diameter
ZHOU Xi
reng PAN Hou zhi
(Tianjin University)
Abstract：Foundation resistance coefficient method is applied to numerical
analysis of the interaction between soil and deep embedded cylinder shell with large
diameter. Reduction of the coefficient m, reflecting the variation of reaction modulus in
depth, along the circle is considered.Furthermore, a new method for simulating shear force
between soil and shell structure is proposed。This
method has been successfully used in engineering practice.
Key
words：interaction between soil and
structure; numerical analysis; cylinder shell; winkler foundation
Neural network of phase space and its application in dam safety
monitoring
XU
Hong-zhong, WU Zhong-ru, LI Xue-hong
(Hohai University)
Abstract:
Combining the chaos theory with neural network theory,a fuzzy network model of phase space
for analyzing the observation data of dam monitoring is established.The analysis on the
horizontal displacements of a gravity damis given as an example for the application of the
model.First,after reconstruction of phase space of measured time series,the correlation
dimension is derived,which shows the chaos effect lies in the time series of the
horizontal displacement.According to the phase point of measured time series,fuzzy neural
network model of phase space is built.The result shows that the prediction according to
this model is more precise than that of regression model.
Key words:
dam；fuzzy neural network;chaos;phase space;prediction
The parabolic mild-slope equation for irregular waves
LIN Gang
(Zhongshan University)
Abstract:
The parabolic mild-slope equation for the combined refraction and diffraction of
irregular waves is derived using Kubo approximation.The numerical modeling of parabolic
mild-slope equation for irregular waves is compared with the result of physical model.The
parabolic mild-slope equation for irregular waves is shown to be capable of describing
wave propagation over a bed consisting of substantial variation in water depth and
predicting wave refraction-diffraction 3-D topography.
Key words: parabolic mild-slope;irregular
waves;refraction-diffraction;numerical simulation
Numerical solution of water hammer due to pumping
interruptionusing
direct alternative format
XIE Shui
bo1,QIU Chang jun1,CHEN Shen bing1,LI Bu xin2
(1.Nanhua University,China;2.Design Institute of Pearl River Commission)
Abstract:
A practical direct alternative format for calculation of thecharacteristic line equations
and boundary condition equations of water hammer due to interruption of pumping are
proposed.Program for computation is developed。The computation parameters for pumps and
valves are discussed.The application shows that this method is feasible.
Key words: water hammer;pumping interruption;numerical calculation;direct
alternative format;water hammer caculation
Study on silting at the entrance of ship lock approach
LIU
Xiao-ping, XIE Li-fang, JIANG Chang-bo
(Changsha Communication institute)
Abstract：Based on the experience accumulated and the study of hydraulic
model test combining with mathematical model,a series of engineeringmeasure and a rational
operation dispatch scheme have been proposed to prevent from the silting occurred to the
entrance of the ship lock in Zhuzhou Hydro Project.The Project is under planning.
Key
words：ship lock; silting; hydraulic model
test; mathematical model; fluid
Salted soil and its development in Northwest China
WANG Lin1,
GAN Hong1, YU Fu-liang1, WANG Shan2
(1.China Institute of Water Resources and Hydropower Research;
2.Insitute of Hydrogeology and Environment Geology)
Abstract：A review on distribution and formation of salted soil in Northwest
China as well as the present status of utilization and development is presented.It is
pointed out that there exist five problems in the development of salted soil:excessive
irrigation area,low irrigation efficiency,inadequate exploitation of ground water,lack of
drainage planing and misunderstanding on salt damage.The corresponding countermeasures on
these aspects are proposed.
Key
words：salted soil; utilization and
development; problems; countermeasures; Northwest China