非线性强度准则下抗滑桩加固边坡稳定性极限平衡分析

来源期刊:中南大学学报(自然科学版)2020年第10期

论文作者:罗伟 徐长节 荣耀 陈磊 戴程琳

文章页码:2950 - 2959

关键词:抗滑桩;边坡稳定性;极限平衡;非线性强度准则;安全系数

Key words:anti-slide pile; slope stability; limit equilibrium; nonlinear strength criterion; factor of safety

摘    要:考虑到现有极限平衡方法无法揭示非线性强度准则下抗滑桩加固边坡的作用机理,应用土压力理论简化抗滑桩与边坡滑体的力学计算模型,并根据力学平衡条件推导出抗滑桩桩侧有效压力。然后,基于瑞典法所得滑面应力计算式,由边坡安全系数定义建立非线性强度准则下抗滑桩加固边坡稳定性极限平衡解决方案。最后,通过工程实践验证本文解决方案的有效性。研究结果表明:岩土体非线性参数对边坡稳定性有着显著影响,且考虑岩土体非线性时需增加抗滑桩桩长才可确定边坡满足稳定性要求;抗滑桩布置于临近坡脚点位置有利于提高边坡稳定性,但应防止位于抗滑桩上方的边坡滑动体出现局部破坏。工程实例结果表明本文解决方案可有效应用于边坡抗滑桩加固设计。

Abstract: Considering that the reinforcement mechanism for the slope reinforced by the anti-slide piles with the nonlinear strength criterion has not yet been revealed by the existing limit equilibrium methods, the earth theory was applied to simplify the mechanical model of the anti-side pile in the slope sliding body, and the effective pressure on the side of anti-slide pile was deduced according to its mechanical equilibrium condition. Then, based on the formula of stress on the slip surface obtained by the Swedish method, the limit equilibrium solution of slope stability with nonlinear strength criterion was established according to the definition of slope safety factor. Finally, the effectiveness of the proposed solution was validated by engineering practice. The results show that the nonlinear parameter of geotechnical body has significant influence on slope stability, and it is necessary to increase the length of anti-slide pile for achieving the design goal of the slope in stable state when the strength nonlinear of geotechnical body is considered. It is beneficial for the anti-slides piles arranged near the slope toe to improve the slope stability, but the slope local failure above the anti-slide piles should be prevented. The results from engineering case show that the proposed solution is effective for guiding the reinforcement design on the slope reinforced by the anti-slide piles.

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