2004 Vol. 18, No. 5

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Application of Generalized Reliability Method Based on Fuzzy-Stochastic Theorem in Bank Slope Stability Analysis
Wang Yajun
2004, 18(5): 217-223.
[Abstract](32) [PDF 518KB](3)
Abstract:
On the basis of conventional probability ultimate theory,through analyzing the fuzzy identity of bank slope stability situation,the fuzzy-stochastic reliability method based on the math theorem of MCS and FORM is established. By using this method,the stochastic parameters sensitivity analysis is implemented respectively on slope collapse and seepage failure of bank slope.Furthermore,the system failure of bank slope is introduced.
Application of Fuzzy Neural Network in the Classification of Rock Mass Surrounding Tunndel
Song Guoxin, Yang Zirong, Sun Xiang
2004, 18(5): 224-226,229.
[Abstract](29) [PDF 339KB](4)
Abstract:
Through the combination of fuzzy sets and neural network,and synthesizing the output of each subnetwork by using fuzzy integration,the stability model and the classification method of surrownding rook are put forward.The result of calculation shows that this method can overcome the shortcomings of traditional naural network and offer reliabal informations for construction.
Some Porblems about the Determination of Anti-uplift Groundwater Level of Building Foundation
Zhang Siyuan
2004, 18(5): 227-229.
[Abstract](54) [PDF 181KB](12)
Abstract:
The uplift pressure on building foundation is mainly controled by the groundwater level of the stratum sit by foundution.In the site with multi-level grounduater,the highest grourdwater level should be predicted layer by layer.
Improvement on the Three-dimensional Model of the Stability of Slurry Trenchs in Diaphram Wall Engineering
Li Chao
2004, 18(5): 230-234.
[Abstract](23) [PDF 405KB](3)
Abstract:
Through modifying the current mechanical model and the current cumputational method of the stability of slurry trenchs in diaphram wall engineering,the improved parabolic cylinder model is put forward.The objective function based on the limit equilibrium theory is established and designed with the complex optimal method.The superiority of this method is proved by engineering practice.
Determination for the Bearing Stratum Capacity of Layered Foundation Soils
Li Lianying, Lin Bo
2004, 18(5): 235-237.
[Abstract](54) [PDF 141KB](6)
Abstract:
Through the analysis on the layered foundation soil,the method used to revise the bearing stratum capacity of layered foundation soil is given. At the same time, through the analysis on the bearing stratum capacity that adopted by two buildings, which are located in the same residence area and their settlements is stable, and the use situation of the two buildings, the reasonablity of this method is tested.
Prediction for the Bearing Capacity of Pile Foundation by the Grey Model with Different Time Steps
Tang Junfeng, Tang Xuemei, Hu Xiangzhao
2004, 18(5): 238-241.
[Abstract](33) [PDF 306KB](3)
Abstract:
According to the theory of grey system,the different time steps model of GM(1,1)in the pile foundation engineering is established,and a testing method of this model is provided.Through engineering practice and precision examination,it is shown that the calulated result gear very well with the tested result,and the model has a very high precision.
Determination Method for the Size of Cross Section of Self-weight Type Retaining Wall
Huang Taihua, Yuan Jian
2004, 18(5): 242-243,247.
[Abstract](45) [PDF 140KB](7)
Abstract:
Designers usually have to calculate many times to decide the size of cross section for self weight type retaining wall because not analyzing the design point very well. There presents a new design method,basing on satisfying anti sliding to calculate the engineering quantity and adjust properly to satisfy anti overturning requirement.Applying this method,designers can choose the size easily,which can satisfy anti sliding and anti overturning stability requirement at the same time.
Analysis and Study on Indoor and Outdoor Testing Method of Coefficient of Subgrade Reaction
Liu Yanhua
2004, 18(5): 244-247.
[Abstract](67) [PDF 173KB](7)
Abstract:
By discussing and analyzing the indoor and outdoor testing methods of coefficient of subgrade reaction, the irrationality about its testing method is given. And based on above, studying and testing on coefficient of subgrade reaction are carried out. At last, two new simple and practical indoor methods are proposed.
Application of the Composite Foundation with Multielement Pile in Ground Treatment for Highrise Building
Sun Zhijun, Wang Yingyan
2004, 18(5): 248-251,262.
[Abstract](27) [PDF 394KB](6)
Abstract:
As composite foundation with multi-element pile,the under-rammed bored pile,which composites the cast-in-place pile in upper part and the rammed bulb pile in under part,is used in an engineering by combining with the rammed and compacted lime-waste-soil pile.The function of this composite foundation lies in,improving the bearing capacity of ground soil and controlling the settlement of building by the under-rammed bored pile,and compacting the soil around pile and improving the compressibility of artificial soil by the rammed and compacted pile.The best plan of ground treatment from analysis and calculation can provide some valuable informations for the similar engineering.
Study on Design of Composite Foundation with Long-short Pile
Sun Yanlin
2004, 18(5): 252-254.
[Abstract](36) [PDF 255KB](8)
Abstract:
Through the contrast analysis of different calculation formulae of bearing capacity for composite foundation with long-short piles,the optimal design method is put forward,the calculation formula of settlement and the testing method of consolidation effect are both presented.At last,It is suggested that the theory of compsite foundation with long-short piles can be flexibly used in piles compensation design.
Probabilistic Analysis Method for Bearing Capacity of Composite Foundation Based on Bayes' Theorem
Qin Jianqing, Chen Jianfeng
2004, 18(5): 255-257,266.
[Abstract](30) [PDF 190KB](3)
Abstract:
Based on Bayes' theorem,probabilistic analysis method has been studied for bearing capacity of composite foundation.According to prior distribution and some measured results,a calculation method for posterior distribution has been proposed.
Numerical Simulation on Tunnel Construction and Security Analysis of the Lining Structure Strength
Wang Yong
2004, 18(5): 258-262.
[Abstract](90) [PDF 246KB](6)
Abstract:
By using the 2D-FEM of elastic-plasticity,simulation of tunnel excavation is carried out,and the internal force and safety coefficient of the lining is calculated to inspect structure security.Then the thesis discusses the effect of thickness changing on lining safety coefficient and structure stability,thus offers guidance and reference for the design and construction of similar highway tunnel.
Corrosion of Anchor Bar and Its Resistance
Huang Yu, Guo Zhikun, Xiang Xiaofeng
2004, 18(5): 263-266.
[Abstract](38) [PDF 182KB](5)
Abstract:
In practical engineering,serious damage resulting from the corrosion of anchor bar occurred frequently.The conditions of corrosion and the types of corrosion are summarized,and the main factors influencing corrosion are analysed. At last,the basic requests and measures of corrosion resistance are presented.
Characters Analysis and Design Optimization of Super-deep Anti-seepage Purdah
Yang Bo, Liu Guobin, Yang Guangxu
2004, 18(5): 267-270.
[Abstract](56) [PDF 170KB](4)
Abstract:
Super-deep anti-seepage purdah is used very few and mainly in hydraulic and bridge engineering. It is very difficult to control its parameters, which are very important to the construction. How to determine those parameters that not only insure the engineering effect, but also affect the cost. Based on the basic theory and calculations, and compared with the related law, the appropriate parameters are put forward, which are also proved by certain construction.

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