2005 Vol. 19, No. 1

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Numerical Simulation for Ground Subsidence due to Underground Metro-station Excavation and Comparison with Peck Volume Loss Model
CHEN Jun, LIU Bo, TAO Long-guang
2005, 19(1): 1-4.
[Abstract](26) [PDF 197KB](7)
Abstract:
A metro-station of the Guangzhou metro line 3# is expected to be constructed by expanding excavation on two established shielding tunnels. Using FLAC3D code, the numerical simulation on this metro-station excavation is presented. Further, the method of least square is used to simulate the curve of Peck volume loss model. The acquired formula for ground movement prediction shows good agreement with practical results. The current research will offer reference for similar engineering of metro-construction.
The Application of Artificial Neural Networks to Low Strain Integrity Testing of Foundation Piles
FENG Jing, GAO Guang-yun
2005, 19(1): 5-8.
[Abstract](61) [PDF 188KB](8)
Abstract:
There are many methods for analyzing the data of low strain integrity testing on foundation piles, but there are a lot of the artificial interferences in the data processing. Based on the powerful nonlinear reflection and training function of artificial neural networks,the model of BP neural network for foundation piles integrity testing is put forward. According to in-situ measurements, every interference in the data processing can be avoided in this model. At last, the model is applied to the analyzing a case history. The results of training and examination show that this method is speediness and convenience on the pattern identification of pile integrity.
The Slope Stability Analysis of Highway and Research of Treating Measure Fitted into Environmental Protection
YAO Jing-song, CAO Ping
2005, 19(1): 9-12.
[Abstract](52) [PDF 370KB](9)
Abstract:
Taking the typical rock slope stability analysis of Chang-Zhang highway for example, the whole process of slope stability analysis is systematically introduced, at the same time,a treating measure of biological prevention of slope is proposed from the angle of environment protection.
Study on Numerical Simulation of Seepage of Underground Engineering and Its Application
ZHANG Wei, XIAO Ming
2005, 19(1): 13-16.
[Abstract](35) [PDF 205KB](6)
Abstract:
Combined with the reality of 3D FEM analyze of complicated seepage field of underground engineering,penetrability tensor is utilized to simulate the non-isotropy medium,improved abandon-element method is utilized to calculate the free surface,latent complex-material element is utilized to simulate the waterproof,slot instead of well curtain is utilized to simulate the drainage.Based on the above theory,3D FEM calculation program for seepage analyse is compiled.Finally this program is applied on seepage analysis of 2nd Project of Manwan Underground Plant.Based on the result,the factors influencing seepage flow area are analyzed.The result testifies the rationality and practicability of the program.
Application of Parameter-method in the Design of Bottom-slab's Size of Cantilever Type Retaining Wall
YUAN Jian, LIU Qi-mei
2005, 19(1): 17-19.
[Abstract](56) [PDF 139KB](9)
Abstract:
Through the analysis on the characteristic of cantilever type retaining wall,the parameter-method used to design the size of bottom-slab is presented, and the influence made by bearing capacity of ground is further studied.The result of calculation shows that this method can make the design easier and reasonable.
Study of Rayleigh Dispersion Curves Calculation for Pavement Systems
YANG Tian-chun, YI Wei-jian, HE Ji-shan
2005, 19(1): 20-23.
[Abstract](40) [PDF 198KB](6)
Abstract:
The shear wave velocities of pavement systems decrease with depth, and their dispersion curves can be obtained by the stiffness matrix approach or the finite element method, etc. For pavement systems, searching for the roots of the frequency equation is beset with difficulties. The roots are mostly complex numbers and numerical overflow problems occur frequently. Through adding a high velocity layer under the sub-grade, then, the roots become real numbers. The influence is more and more weak with the thickness of sub-grade increasing. The new method is feasible from simulated results.
Study on Vertical Bearing Capacity of Post-injecting Paste Bored Pile
LI Lian-ying, LIN Bo, SHAO Jian
2005, 19(1): 24-27.
[Abstract](47) [PDF 296KB](10)
Abstract:
Through analysing several results of static loading test of bored pile which injected paste to pile tip after pile driving,a method of estimating for the standard vertical limited bearing capacity of single pile has been presented in TianJin area.
Study on Methane Drainage with Technique of Multi-perforating and Fracturing
LUO Yong
2005, 19(1): 28-31.
[Abstract](30) [PDF 352KB](6)
Abstract:
Compound technique of perforating can effectively control the perforating direction and the fracturing expansion.The functional mechanism of this technique is analyzed theoretically and related parameters are calculated.This technique is applied to fracturing coal seams and the on-site monitoring effects are satisfactory. The development direction and application prospects of compound technique of perforating are both pointed out.
Research and Development of Unloading Rock Mass Mechanics Theory
WANG Fei, YANG Xue-tang
2005, 19(1): 32-35.
[Abstract](41) [PDF 347KB](13)
Abstract:
There is essential difference between the mechanical condition of unloading engineering rock mass and loading engineering rock mass.On the base of reviewing the current status of unloading rock mass mechanics,the main problems are presented from test research,theory and engineering application. Some opinions on furture development trend are brought forward.
Deformation and Consolidation Effect of Softsoils Treated by Vacuum Preloading Method
JIANG Zeng-guo, YAO Zhi-an
2005, 19(1): 36-38.
[Abstract](49) [PDF 147KB](6)
Abstract:
Combined with an engineering case of foundation treatment,the consolidation effect of vacuum preloading method is studied.Through analyzing the data of settlement and inclination, it shows that vacuum preloading method is successful used to consolidate the softsoils in this area.
Analysis on the Test and Design Calculation of Bracing Structure for Foundation Pit
LIU Ya-chen, HUANG Chao-ning, WU Ju-ying
2005, 19(1): 39-42,45.
[Abstract](41) [PDF 234KB](10)
Abstract:
Through analysis on design calculation and the test deformation and internal force of bracing structure for foundation engineering and active (passive) soil pressure in site,some profitable experiences are obtained,which can offer some references for the application and spread in local soft area.
Several Problems of Layerwise Summation Method in Settlement Calculation
CHEN Kai-sheng, LIU Yu-feng
2005, 19(1): 43-45.
[Abstract](54) [PDF 142KB](7)
Abstract:
Several problems of layerwise summation method in settlement calculation are disscussed,such as the calculation of echelon section additional load,the lower limit of compressed layer,the modulus of compressibility.This work gives a practical reference for subgrade design and construction.
Testing study on Stress and Deformation of Two-sided Vertical Mutual Anchoring Retaining Wall
SU Jun, YU Tian-qing
2005, 19(1): 46-49.
[Abstract](26) [PDF 371KB](7)
Abstract:
A two-sided vertical mutual anchoring retaining wall with height H=9 6m was built in high grade highway engineering in mountain areas firstly. In order to research the horizontal displacements,basement pressure and lateral pressure of wall,the testing study is made on the full-scale.The change and distribution law of the reinforcement tensions,the lateral earth pressure on the face,the vertical earth pressures at the base,the horizontal displacements are obtained. The results can be used as a reference for future studies and designs of similar retaining structures.
Analyzing the Influence of Cushion in CFG Pile Composite Foundation
LI Shao-he, YI Fa-cheng, WANG Dian-gang
2005, 19(1): 50-52.
[Abstract](45) [PDF 143KB](9)
Abstract:
The cushion in CFG pile composite foundation is studied, the influence of the different cushion thickness and compression modulus in CFG pile composite foundation to stress ratio of pile and soil, friction in side of pile, settlement and bearing capacity are also discussed.
The Construcion Technology of Bored Pile On-sea
CENG Ding-bang, PENG Wen-xiang
2005, 19(1): 53-55.
[Abstract](65) [PDF 319KB](11)
Abstract:
The construction technology of bored pile on Donghai bridge is introduced, which include some key technology,the bored equipment and how to compound fresh water slurry.

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