滑坡-抗滑桩土拱效应三维数值模拟研究

Three-dimensional Numerical Simulation of Soil Arching Effect between Landslide and Anti-slide Pile

土拱效应的变化规律对地质灾害治理具有十分重要的意义。基于堂梨树滑坡,研究不同埋深下土拱效应的主应力及荷载分担比变化规律。结果表明:(1)桩后端承土拱体现为小主应力拱,拱脚为桩后侧面,拱形呈M形;桩间端承土拱体现为大主应力拱,拱脚为桩间侧面,拱形呈抛物线形;滑坡推力主要由桩后端承土拱承担。(2)桩体埋深不同,土拱的承载能力、分级承担比例及土拱形状均会发生改变,承担荷载与土拱拱层厚度和分布范围呈正相关。

The change law of soil arching effect is of great significance to the management of geological disasters. The change law of main stress and load sharing ratio of soil arching effect under different buried depths is studied based on Tonglishu Landslide. The results show that： ①The soil-bearing arch at the back end of pile is a small main stress arch with the arch foot as the back side of the pile and the arch shape is M shape; the end bearing soil arch between the piles is a large main stress arch with the arch foot as the side between piles and the arch is parabolic shape; landslide thrust is mainly borne by the soil bearing arches at the rear of the pile. ②With different buried depths of pile body, the bearing capacity, grading proportion and arching shape of soil arching will change. The bearing load and soil arching thickness and distribution range are positively correlated.