防灾减灾工程学报2023，Vol.43Issue(6)：1386-1394,9.DOI:10.13409/j.cnki.jdpme.20220509005
基于拟动力法抗滑桩加固非饱和土边坡稳定性分析
Seismic Stability of Unsaturated Soil Slopes Stabilized by Anti-slide Piles Based on Pseudo-dynamic Approach
摘要
Abstract
Based on the upper bound limit analysis theorem and the pseudo-dynamic approach,a modi-fied horizontal slice method is proposed to calculate the work rates of soil gravity and seismic inertia forces,both characterized by evident nonlinear distribution features.Traditional plasticity theory is ex-tended to unsaturated soils to account for the influence of soil suction on the resistance forces acting on piles.The proposed method is validated by comparing it with analytical solutions.A series of paramet-ric analysis are conducted regarding the impacts of soil suction and pile design parameters on soil slope stability.The results show that the slope stability is underestimated by 20%～50%when soil suction is not considered in practice.The suction effect depends on seismic excitations and is significantly en-hanced when the seismic wave approaches its peak.The horizontal,vertical acceleration coefficients,and the soil shear modulus all have a great influence on seismic slope stability.When the pile spacing D1/dp≤4,pile reinforcement becomes obvious and increases rapidly as the internal friction angle in-creases.The optimum pile location commonly lies in the middle and upper part of the slope.The opti-mum pile location gradually decreases,and the pile reinforcement is slightly reduced as the internal friction angle increases.关键词
非饱和土边坡/极限分析/抗滑桩/拟动力法/基质吸力Key words
unsaturated soil slope/limit analysis/anti-slide pile/pseudo-dynamic approach/matric suction分类
建筑与水利引用本文复制引用
王龙,陈国兴,胡伟,周恩全,孙德安..基于拟动力法抗滑桩加固非饱和土边坡稳定性分析[J].防灾减灾工程学报,2023,43(6):1386-1394,9.基金项目
国家自然科学基金项目(52208345)、成都理工大学地质灾害防治与地质环境保护国家重点实验室开放基金项目(SKLGP2022K002)、江苏省自然科学基金项目(BK20210479)资助 （52208345）
