基于极限平衡理论与有限元强度折减法的某涉水高边坡稳定性分析

Stability Analysis of High Slope Based on Limit Equilibrium and FEM Strength Reduction Method

该文以深圳某大型涉水高边坡为研究对象,将极限平衡法和有限元强度折减法原理相结合,从边坡稳定性角度出发,应用理正及有限元软件分别对开挖边坡整体抗滑稳定性和局部面层塑性破坏进行计算分析。研究结果表明,原始边坡安全系数大于规范允许值,边坡防护结果符合稳定性要求,但边坡浅层面在地应力卸荷作用下仍会产生破坏问题,因此,采用锚杆框格梁支护结构来减少边坡面层卸荷崩解破坏对工程安全造成的影响,支护后边坡稳定系数为1.47,满足规范允许值要求。利用圆弧滑动极限平衡法对开挖边坡进行多断面整体稳定分析的同时,采用有限元软件对边坡典型断面的护坡结构进行设计,能够更为全面、准确、快速地分析大型边坡工程的整体抗滑稳定性,并满足局部稳定安全要求,可为类似工程提供借鉴。

This paper takes a large waterside high slope in Shenzhen as the research object, which combines the principle of limit equilibrium method and finite element strength reduction method to calculate and analyze the overall anti-slip stability and local surface plastic damage of the excavated slope from the perspective of slope stability by applying Lizheng deep foundation pit plane finite element software respectively. The research shows that the original slope safety coefficient is greater than the design allowable value, and the slope protection results meet the stability requirements. However, the shallow surface of the slope will still produce damage under the effect of ground stress unloading, so the anchor frame lattice beam support structure is used to reduce the impact of slope surface unloading disintegration damage on engineering safety. The stability coefficient of the slope after reinforcement is 1.47, which meets the requirements of the specification. The arc sliding limit equilibrium method is used to analyze the overall stability of the excavated slope in multiple sections, while the finite element software is used to design the slope protection structure in typical sections of the slope. That can analyze the overall anti-slip stability of large slope projects more comprehensively, accurately and quickly, and meet the local stability safety requirements. The research outcomes are of reference value for the safety and stability design of high slope excavation projects.