Applied Mechanics and Materials Vols. 170-173

Abstract: Abstract. This article compared the two supporting structure programs which were prepared for the foundation pit of Zhengzhou Exhibition Hotel, from the angle of cost, duration, and deformation conditions. The better one was selected for the project. Monitoring results of two important indicators with the security of supporting structure were analyzed; they were deep displacement in supporting structure and displacement of pile top. With the conditions of continuous excavation, this paper also concluded shifty discipline and tendency of the supporting structure, which could provide some references to similar projects.

Abstract: Central coordinates of the critical failure surface of uniform slope are searched by using procedural Simplified Bishop equation. Comparison of stability factor K calculated by the program with existing ones shows that the program is available. The sensibilities of the factors influencing on slope stability are analyzed by orthogonal test method. The results indicate that the sensibilities of the factors are as follows in their magnitude order: slope height H, ratio m, internal friction angle φ, cohesion c and unit weight γ. Central coordinates of the critical failure surface is located at center of the K contours, the results of Fellenius straight-line method and Taylor chart method are different from the program’s. The fitting curves of central coordinates change with γtanφ/c and the corrected values are obtained based on a large number of calculations. It can be conveniently used in actual engineering.

Abstract: In order to accurately simulate the distribution of complicated in-situ stress filed of reservoir using the method of numerical simulation. In this paper, firstly, we have established the injection-production pore pressure model around refracturing well using potential additive principle; secondly, we have established primary fracture induced stress field model, considering that the weakly compressible fluid is filled with the injection-production primary fracture and introducing the elastic coefficient of fluid; finally, we have calculated the distribution of stress around a production well using ANASYS software. The calculating result is accurate and agrees well with practical ones. This method can solve the problem of calculating complicated in-situ stress filed using analytical method, and provides a new method for the subsequent study of stress field.

Abstract: In order to describe the stability of borehole face and the theory of hydraulic fracture fissure stretch in real, the stress field of adjacent rock in the hole should be constituted exactly .The article is based on the damnification dynamics theory, meanwhile, considered the rock is fracture-pore dual medium and the damnification characteristic of the rock in hole .Adjacent formation is sectioned three areas: damage-area, damnification-area, elasticity-area. And we have calculated the ambient stress distribution of one oil-well .The results show that the destructive radius of the minimum in-situ stress direction is 1.247m, the damage radius is 8.082m, the destructive radius of the maximum in-situ stress direction is 0.998m, and the damage radius is 6.5865m.

Abstract: This article takes soil erodibility factor as the research object, compared with the existing calculation formula. And it takes Yian (in Heilongjiang Province) as an example, quantitatively calculating the specific values of the black soil erodibility factor in northeast district, in order to provide basic data and scientific basis of the black soil for the purpose of conservation and sustainable development of soil and water in northeast district.

Abstract: Earthquake effect of the construction site in Shijiazhuang city was studied when the artificial wave is taken as input ground motion. The dynamic parameters in the model were taken from the measured values, recommended values in 94 Code and recommended values by X.M. Yuan respectively. The ground peak acceleration and acceleration response spectra are compared and analyzed, and it shows that the calculation results from the recommended values by X.M. Yuan are more close to the results from the real measured values than 94 Code. The results can be taken as a reference of the soil dynamic value in seismic risk assessment of engineering projects.

Abstract: This study simulates the slope stability at Jiu-Fen, using the limit equilibrium method and the finite element method. The limit equilibrium method can find potential slide surfaces and safety factors rapidly. The advantage of the finite element method is that it utilizes more reasonable soil behavior and boundary conditions. A critical slide surface obtained by the limit equilibrium method can be compared with the displacement vector, stress field and location of plastic zone obtained by the finite element method. Furthermore, we can compare the safety factors produced by the two methods. This study shows that the safety factor from the limit equilibrium method is higher than that from the finite element method. The displacement analysis by the finite element method agrees well with the progressive slope failure. So, if we combine the two methods using monitored data in the field, we can analyze slope stability clearly.

Abstract: Based on momentum equations of signal sand particle in airflow, the sand particle dynamic model was derived. Furthermore, the calculation equations of time, velocity and distance when the sand particle flies from leaving land to getting land are being offered by analyzing the dynamic model. Meanwhile the velocity distribution integral and differential equations of sand particle in dust flow are built up according to the definition of dust flow. Particularly the author puts forward the approximate method to calculate it, and analyzed the motion characters of sand particle dynamic model on sand of storm two-phase flow in theory.

Abstract: In order to get better calculation parameters for slope stability analysis, as well as provide a better theoretical basis for slope design and reinforcement. In this paper, based on the single factor sensitivity analysis method, the finite difference strength reduction method was taken to calculate the slope safety coefficient when influence factors change. Sensitivity analysis process was explained through a numerical example, the calculation result shows that, influence factor sensitivity of slope stability is related to the value of influence factor.

Abstract: This paper describes landslide rock-soil structure characteristics and physical-mechanical properties on the left side of a roadbed, and landslide formation mechanism and harm were analyzed in construction, with the transfer coefficient method and finite element method, the stability of the foundation and structures were evaluated, the stability coefficient and surplus sliding force of landslide were calculated, according to the calculation results, treatment measures are proposed, and the landslide stability were made comparative analysis before and after treatment, and that valuable experience and lesson were gained, which provide a strong basis for the landslide recognition and design, at the same time has a certain reference value for similar landslide governance.