随着黄土高原地区经济的迅速发展, 场地问题已成为制约地方经济发展瓶颈, 削坡造地成为必然, 为此, 引发 了大量灾难性黄土滑坡。从坡体开挖造成边坡失稳的极限平衡理论出发, 在不同开挖尺度下, 分别从应力、 应变和 屈服区的变化特征等方面进行了计算分析。结果显示, 开挖区域形成水平减载作用, 坡顶易出现张拉裂缝, 开挖加 速形成上下贯通的屈服面, 最后对不同开挖尺度下的坡体稳定性进行分析。研究结果对黄土地区边坡开挖具有科 学指导意义。

With the rapidly economic development in the Loess Plateau, the site has become a bottleneck restricting the develop2 ment of local economy, which leads to inevitable slope cutting and therefore a large number of catastrophic loess landslides. Ac 2 cording to the limit equilibrium theory of slope instability caused by excavation, the variation characteristics of stress, strain, and yield zone were analyzed under different scales. T he results showed that the excavation area forms horizontal load decrement, the top of slope is prone to the occurrence of tension crack, and the excavation can accelerate the formation of the yield surface from top to bottom. Finally, the excavation slope stability was analyzed under different scales. The research results are of scientific and guiding significance on the excavation slope in the loess area.

国家自然科学基金重点项目( 41130753) ; 湖北省教育厅科学研究计划项目( Q20122510) ; 许昌市科技局基础与前沿课题 (1404010) ; 许昌学院科研基金项目( 2014089)