A detailed study about the application of in situ stress field in engineering slope has been carried out. To take the in situ stress into account in analysis of slope stability, the parent-model with coarse grids and sub-model with fine grids was established. In order to determine the in situ stress field of slope, the regional stress field calculated by stress regression method was converted to stress boundary of sub-model. The analysis of slope stability based on the in situ stress field is accurately to reflect the effect of natural factors.
[Nie, Lin] School of Civil Engineering, Southwest Jiaotong Univ., Chengdu 610031, China;[Zhou, Depei] Chengdu City Construction Investment Management Group Co., Ltd., Chengdu 610015, China
rock slope;deep-cutting valley;excavation deformation;numerical analysis
The mainly purpose of the paper is to investigate the slope excavation deformation of the rock slope at the deep-cutting valley under different load conditions. As an example of the rock slope at the intake of the sluice tunnel of Jinping hydropower station, whose slope deformation characteristics was system analyzed by numerical method during different construction conditions. The dead weight, rain, seism and theirs combination were involved in the numerical analysis. The numerical results could give a reference for the excavation stability of the high rock slope, and it is the basis to determine the reasonable construction method and to optimize the design of the strengthening and enhancing engineering.
As a slope retaining structures of micropile unit, the micropiles may bear the axial pressure. The paper analyzes the stability of the compression micropile, and establishes the calculation model with the soil resistance. Then we get the ultimate bearing capacity formula using the ZHANG-Method that the distribution of subgrade resistance is constant. With the help of ANSYS buckling analysis, a finite element numerical model can be established. At last, through an example to make comparison to solutions of theory and numerical simulation, and provide useful conclusions. Copyright ASCE 2009.
The excavation, the creep of soft rock and rainfall are the main reasons for the failure of the soft rock slope. The deformation and stability of soft rock slope under excavation and rainfall, as well as the effect of the supporting system on slope deformation are analyzed by physical modeling. It is suggested that the immediate supports are necessary to decrease the deformation of slope under excavation. Meanwhile, the supporting system can effectively restrict the creep deformation of soft rock slope, especially for the areas of the middle and bottom of the slope.