Seismic permanent displacement of clay slopes reinforced with cantilever stabilizing piles
Seismic permanent displacement of clay slopes reinforced with cantilever stabilizing piles
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DOI：
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发表时间：
2013
影响因子：
1.5
通讯作者：
Zhu Guang-cen
中科院分区：
文献类型：
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作者：
Zhu Guang-cen
为了有效地得到悬臂稳定桩加固粘土边坡的地震永久位移，基于极限分析上界定理和土质边坡的圆形破坏模式，通过计算外荷载做功率和耗能率，推导出悬臂稳定桩加固边坡在地震作用下的安全系数和相应的屈服加速度。然后，结合Newmark滑动块法，通过对边坡旋转加速度进行二重积分，推导出与设计安全系数相关的地震永久位移表达式。以5.12汶川地震作用下的某粘土边坡为例，通过与Ambraseys方法的对比，验证了所提方法的有效性。此外，给出了加固边坡的永久位移时程，并给出了永久位移与边坡安全系数的关系。得到了不同安全条件下土体黏聚力和内摩擦角对永久位移的影响规律。研究结果表明，边坡永久位移随设计安全系数的增大呈指数递减。在设计安全系数较低的情况下，永久位移对土体抗剪强度参数更为敏感。但随着设计安全系数的增大，灵敏度逐渐降低。
In order to get the seismic permanent displacement of clay slope reinforced with cantilever stabilizing piles effectively,based on the upper bound theorem of limit analysis and circular failure mode of soil slope,factor of safety and the corresponding yield acceleration of slope with stabilizing piles under the earthquake can be derived through calculating the rate of work done by external loads and the energy dissipation rate.Then,combined with the Newmark’s sliding block method,the expression for the seismic permanent displacement related to design safety factor can be deducted by the double integrals of the rotational acceleration of slope.The paper takes a clay slope reinforced with cantilever stabilizing piles under the 5.12 Wenchuan Earthquake for example,the validity of the proposed method is verified by comparison with Ambraseys’s method.In Addition,the permanent displacement time history of the reinforced slope is given,and the relationship between the permanent displacement and factor of safety of the slope is also shown.The laws that the permanent displacement affected by the cohesion and internal friction angle of soil under different safety conditions are obtained.The research results show that the permanent displacement exponentially decreases with design safety factor of the slope increasing.In the case of lower design safety factor,the permanent displacement is more sensitive to soil shear strength parameters.However,the sensitivity is gradually reduced with the increase of the design safety factor.