2001 Vol. 15, No. 4

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Application of Artificial Neural Network in Back-analyzing the Soil Parameter of Deep Excavation
2001, 15(4): 187-189,211.
[Abstract](45) [PDF 281KB](4)
Abstract:
Based on the elastic-plastic displacement back-analysis of deep excavation,the Artificial Neural Networks(ANN) is applied in the back-analysis of deep excavation and the deformation prediction is built through ANN.Its practicability is reliable by engineering case.
Changes for Intensity Parameters of Unsaturated Soil Disturbed by Construction
2001, 15(4): 190-192.
[Abstract](43) [PDF 107KB](6)
Abstract:
During construction,intensity parameters of unsaturated soil have some changes,but some mechanical indexes of original stated soil are adopted in design,which must be bring about some errors.In order to resolve this problem,Some triaxial tests to simulate the practical stress paths of unsaturated soil are introduced,the affection and changed properties of cohesion and inner frictional angle of unsaturated soil disturbed by construction is researched.On the basis of research,the reasons of these changes is analyzed.
Research of the Non-linearity Models of Soil Resistance
2001, 15(4): 193-197.
[Abstract](30) [PDF 268KB](4)
Abstract:
Based on analyzing the change of soil resistance surrounding pile with the displacement of foundation pile during dynamic test,some relative models of soil resistance surrounding pile and soil resistance on pile's end in high strain condition are given.The models are proven by engineering practice.
An Analytical Solution for Settlement of Composite Piled Foundation
2001, 15(4): 198-203.
[Abstract](28) [PDF 330KB](4)
Abstract:
The distribution of lateral fricrion of single pile is deduced by using bilinear model.And the settlement of single pile is calculated by MINDLIN elastic theory.Through the method mentioned above,a series of analytical solutions of the settlement of composite piled foundation are deduced.The calculated results can be used directly in analyzing the settlement of single pile.
Discuss on Forecasting Ultimate Bearing Capacity of Single Pile by Hyperbola Method
2001, 15(4): 204-207,216.
[Abstract](39) [PDF 160KB](4)
Abstract:
Using the data of 49 pile's static loading tests,the ultimate bearing capacity of pile is forecasted by hyperbola model and compared it to the results of tests,the suitable limits and forecasting precision of settlement control method and discount coefficient method are discussed.
Analysis of Methods to Determine Compressed Layer's Thickness in Calculating Foundation Settlements
2001, 15(4): 208-211.
[Abstract](42) [PDF 255KB](5)
Abstract:
There are mainly two methods to determine compressed layer thickness in calculating foundation settlements,control strain method and control stress method.Through comparing results of foundation settlement calculated by using the two methods,it is found that control strain method is not reasonable in determining compressed layer.And it resulted from the reason that the thickness of compressed layer determined by control strain does not put relationship with additional stress under foundation.The method to determine the thickness of compressed layer is suggested.
Characteristic of Marine Soft Soil in Lianyungang
2001, 15(4): 212-216.
[Abstract](28) [PDF 164KB](5)
Abstract:
Based on the large quantities of geological survey materials of Lianyungang area,a series of problems about the soft soil are studied,such as the type of formation cause,the physical characteristics,the indoor experiment,the local experiment and the confirmation of mechanical indexes in particular.The result shows,there are some errors in confirming the mechanical indexes of soft soil by indoor experiment,somtimes the value confirmed by indoor experiment is twice as big as that confirmed by local experiment,which is difficult to handle.Vane test or CPT is suggested to confirm the mechanical indexes of soft soil.
Settlement Analysis of Xuan men Second Sea Bank in Yuhuan County
2001, 15(4): 217-220,225.
[Abstract](29) [PDF 305KB](3)
Abstract:
With the methods of summing settlement in divided layers and finite element method,the total settlement and the settlement caused by different load level in this sea bank are analyzed.In order to accelerate the process of drainage consolidation,the plastic drainage plate and the process of loading in different level are designed for the sea bank's soft soil ground base,which makes the degree of consolidation satisfied in the appointed time.
Feasibility for Using Artificial Neural Network to Design the Composite Foundation with Ramming Expanded piles
2001, 15(4): 221-225.
[Abstract](30) [PDF 327KB](3)
Abstract:
Through analyzing the design,constuction and mechanism of composite foundation with ramming expanded piles,some practical experiences are summarized,and the feasibility and foreground for using artificial neural network to forecast the effect of foundation improvement are probed.
Experimental Research on Composite Foundation with Drilling Ram-expanded Piles
2001, 15(4): 226-230.
[Abstract](29) [PDF 162KB](4)
Abstract:
The composite foundation is composed of pile and soil in order to bring latent capacity of soil into full play by reinforcing the soil with string-pearl shape.According to many insitu tests and analyses,the result show that the composite foundation with drilling ram-expanded piles could be applied to high-rise building effectively and successfully.
Application of Two-Stage Fuzzy Classification Polymerization Method in Comprehensive Assessment of Stability of Slope District
2001, 15(4): 231-234.
[Abstract](30) [PDF 237KB](4)
Abstract:
Aiming at the fuzziness existing in the zoned limit of slope stability,the multi stage fuzzy classification polymerization method is established by fuzzy mathematics.The calcuating method and procedure of two stage fuzzy classification polymerization in assessing the slope stability zoning is introduced.By using the two stage fuzzy classification polymerization,the slope stability type in accordance with the stability of the slope district of an area is selected. The comparison of this method with the calculating result of other assessment methods shows,the application effect of the fuzzy classification polymerization method is better than any others,it is a simple,rapid and good method.
Preliminarily Study on the Risk Analysis Methodology for Landsilde
2001, 15(4): 235-240.
[Abstract](31) [PDF 199KB](3)
Abstract:
It is one of the most important evidence of establishing the anti disaster target,optimizing the countermeasures,evaluating the anti disaster effects and making the anti disaster decisions to analyze the risk of landslide.The risk analysis methodology for landslide from the viewpoint of risk distinguishing,risk estimating and risk evaluation is discussed.
Research and Application of Unloading Model about Engineering Rock Mass
2001, 15(4): 241-243.
[Abstract](24) [PDF 224KB](2)
Abstract:
There is essential difference between the mechanical condition of unloading engineering rock mass and loading engineering rock mass. The non-linearity character of unloading engineering rock mass is more significant and the research of unloading engineering rock mass is a new domain. The geological engineering character of unloading engineering rock mass, the certainty of mechanical parameter, constitutive relation and the calculation of releasing load are discussed
Application of Sample Element Method to Determine the Mechanical Parameters of Blocky Structure Crack Rock Mass
2001, 15(4): 244-247.
[Abstract](32) [PDF 138KB](3)
Abstract:
Based on the analysis of the structure characteristics, influencing factor to the mechanical properties, the data of field surveys and indoor studies, the bolcky structure rock mass is classified and the relative sample element is built. The FEM is used to simulate the field large-size trail. The mechanical parameters of each sample element on the base of the mechanical parameters of block mass are abtained.

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