深厚覆盖层潜蚀对大坝应力变形影响的有限元模拟

发布时间：2018-04-11 13:13

本文选题：管涌 + 潜蚀　；参考：《岩土力学》2017年07期

【摘要】：深厚覆盖层坝基潜蚀不一定导致坝基的渗透破坏。但坝基砂砾石土内部细颗粒的流失,一方面会增大土体的渗透性;另一方面可降低土体的强度和变形模量。前者导致坝基坝体渗流场的变化,从而引起坝体变形和应力变化,后者变形模量衰化,导致坝基坝体变形和应力调整。潜蚀造成的坝基和坝体应力变形对大坝的正常使用和安全性带来一定负面影响,定量评估这种影响是内部不稳定砂砾石深厚覆盖层坝基采用悬挂式防渗墙处理方案设计和该类大坝运行管理的迫切需求。提出了潜蚀对大坝应力变形影响的模拟方法,对一个典型大坝设计方案进行了计算分析,该设计方案中潜蚀造成应力变形变化的两种机制中,渗流场变化机制对坝基坝体的应力变形改变远大于模量衰化造成的影响。总体上该方案潜蚀造成的坝体变形和应力变化并未显著降低坝体的安全性。
[Abstract]:The deep overburden suffosion does not necessarily lead to the dam foundation seepage failure of sandy gravel soil foundation. But the internal loss of fine particles, the permeability of a soil will increase; on the other hand can reduce the shear strength and deformation modulus. The former leads to changes in the seepage field of dam and dam foundation, which caused the dam deformation and stress change. The latter leads to the decline of the deformation modulus of dam and dam foundation, deformation and stress deformation adjustment. Bring some negative impact on the normal use and safety of the dam of the erosion caused by the dam foundation and dam stress, quantitative evaluation of this effect is the internal instability of deep overburden gravel with suspended cut-off wall of the dam design and processing the operation and management of the urgent needs. This paper presents a simulation method of erosion of dam stress and deformation effect, for a typical dam design scheme is analyzed, the design scheme of erosion made In the two mechanisms of stress and deformation, the change of seepage field mechanism to dam foundation stress and deformation is far greater than the influence of modulus deterioration. In general, the deformation and stress change caused by potential erosion did not significantly reduce the safety of the dam.

【作者单位】：中国科学院力学研究所;中国科学院大学;中国电建集团成都水利水电勘测设计研究院;
【基金】：国家重点基础研究发展计划课题(No.2013CB035903) 国家科技支撑计划课题(No.2014BAB03B04)~~
【分类号】：TB115;TV64

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