基于拟动力法抗滑桩加固非饱和土边坡稳定性分析
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王龙(1989—),男,讲师,博士。主要从事边坡稳定性研究。E-mail:longwang@jiangnan.edu.cn

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TU43

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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


Seismic Stability of Unsaturated Soil Slopes Stabilized by Anti-slide Piles Based on Pseudo-dynamic Approach
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    摘要:

    基于极限分析上限原理和拟动力法,提出一种半解析改进水平片分法,计算具有非线性分布特征的非饱和土重力和地震惯性力所做外功率,将传统塑性理论扩展至非饱和土中以考虑基质吸力对桩侧阻力的提升作用,与解析解对比验证了该方法的合理性。通过算例分析,揭示了吸力对非饱和土边坡稳定性及抗滑桩加固效果的强化作用,探究了非饱和土边坡的地震响应规律,研究了抗滑桩布设参数对支挡结构边坡稳定性的影响规律。研究结果表明:吸力对边坡稳定性的提升效果可达 20% ~ 50%,吸力效应与地震动特性密切相关,在地震波达到峰值时显著增强;水平和竖向加速度系数以及土剪切模量对边坡地震稳定性影响较大;桩距 D1/dp ≤ 4 时,抗滑桩加固效果较为显著并随摩擦角的增加得到强化,抗滑桩最佳桩位位于边坡中上部,且随摩擦角的增加逐渐减小,对应的加固效果也有所降低。

    Abstract:

    Based on the upper bound limit analysis theorem and the pseudo-dynamic approach, a modified 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 extended 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 parametric 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 enhanced 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 increases. The optimum pile location commonly lies in the middle and upper part of the slope. The optimum pile location gradually decreases, and the pile reinforcement is slightly reduced as the internal friction angle increases.

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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

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  • 收稿日期:2022-05-09
  • 最后修改日期:2022-06-28
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  • 在线发布日期:2024-01-11
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