[关键词]
[摘要]
针对黄陵印台山老滑坡不稳定现状, 通过野外调查采样及一系列室内试验方式获取土样基本物理性质及抗剪 强度指标, 在分析非饱和土渗流过程及作用机理基础上, 探讨了印台山裂缝对黄土边坡稳定性影响, 同时借助geo2 studio2007 软件模拟了上述过程。研究结果表明: 降雨强度及降雨持时与边坡稳定性存在明显相关性, 降雨强度越 大, 边坡稳定性越低; 降雨持时越长, 边坡稳定性也越低。印台山边坡裂缝的存在是影响边坡稳定的积极因素, 裂缝 产生的优先流一方面通过对土体内部孔隙水压力的改变来影响边坡应力平衡, 另一方面通过与岩土层分界面的相 互作用, 促成岩土层分界面发展为优势滑动面, 进而影响边坡整体稳定性。在滑坡防治方面, 建议在坡体前缘段设 置抗滑桩, 以增大坡体抗滑阻力, 并对边坡裂缝进行有机物填充处理, 避免优先流的产生。
[Key word]
[Abstract]
Acco rding to the unstable status o f o ld landslide in Yint aishan of H uang ling Co unty , the physical pro per ties and shear2 ing strength o f so il samples collected in the field w ere determined thro ug h labo rato ry tests. Based o n the analysis of seepag e pr ocess and action mechanism of unsatur ated soil, the impacts of g ro und fracture on the stability of Yintaishan slope w ere dis2 cussed, and the pro cess was simulat ed using the geo2studio2007 so ftwar e. T he results show ed t hat there is an obvio us co rrela2 tion betw een pr ecipitation intensity and duratio n and slope st abilit y, and slope stability decreases with t he increasing o f pr ecipi2 tat ion intensity and duration. The ex istence of g ro und fr actur e can affect slope stability . On one hand, the pr eferential f low gen2 er ated by g ro und fr actur e can affect t he st ress equilibrium of so il slo pe thro ug h the v ariation of po re w ater pressur e; on the other hand, the interaction between the pr eferential flow and interface o f so il lay er can change the interface of so il layer into the prior i2 ty slip surface and then affect slo pe stability . Finally, based on its adver se impact of fr actur e, some sugg estions o f prev ention and treatment wer e put fo rw ard, such that the ant i2slide pile should be co nsidered at the beg inning of slope to increase the antiskid resistance and t he fr act ur e is filled wit h the o rg anic matter to av oid the pr eferential flow .
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[基金项目]
国家自然科学基金项目( 40372114)