基于构造影响下典型剖面不同放坡条件下的稳定性分析

Stability Analysis of Typical Section under Different Grading Conditions Based on Structure

合理的参数和研究方法对构造影响下岩体斜坡的稳定性分析具有重要作用,以胶州湾北部受断裂构造影响下某一工程为例,通过现场载荷试验和室内剪切试验等相关工作确定了构造影响下岩体相关物理力学参数。结合该工程地质勘察相关资料,选取典型剖面,假定3种不同的放坡方式,通过大型有限元ABAQUS商用软件,使用Mohr-Coulomb屈服准则,并利用有限元强度折减法进行岩体的稳定性分析计算,通过实测的构造层物理力学参数得出典型剖面在不同放坡条件下的稳定性安全系数、位移等信息。通过对比不同放坡方案下的稳定性安全系数及位移等信息,得到了在构造影响下该典型剖面最宜的放坡角度,为后续胶州湾北部受构造影响下的基坑施工及支护提供了参考。

Reasonable parameters and research methods play an important role in the stability analysis of slopes under structural influence,a project under the influence of fracture structure in the northern part of Jiaozhou Bay is taken as an example,the physical and mechanical parameters of rock mass under the influence of tectonics are determined through on-site load test and laboratory shear test and related work.Typical section is selected,combined with the geological prospecting related information,through the large finite element ABAQUS commercial software,the Mohr-Coulomb yield criterion is used,the stability analysis and calculation of rock mass is carried out by finite element strength reduction method,the stability factor,displacement and other information of typical section are obtained under different conditions of grading through the measured physical and mechanical parameters of the structural layer.By comparing the stability of the safety factor and displacement under different grading scenarios and other information,the optimal grading angle of this typical section was obtained under the influence of tectonics,it provides a reference for the construction and support of the foundation pit under the influence of tectonics in the following Jiaozhou Bay.