地震作用下土石混合体边坡稳定性分析研究∗
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刘康琦(1996—),男,硕士研究生。主要从事岩土工程方面的研究。E?mail:lkq1104@126.com

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TU443

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国家级地质灾害应急防治项目(2019);四川省自然资源科技计划项目(KJ-2018-23)资助


Stability Analysis of Soil-rock Mixture Slope under Earthquake
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    摘要:

    目前对边坡进行的动力分析多是针对土质边坡或岩质边坡,忽略了土石混合体边坡这一特殊岩土体边坡,而少有的研究中都是将土石混合体边坡简化为等效均质土坡,忽略了块石的存在。利用数字图像处理技术,建立某一实际土石混合体边坡的细观结构模型,利用有限差分软件 FLAC3D 的动力分析模块分析对比了等效均质土坡与土石混合体边坡在地震荷载作用下的变形及稳定性。结果表明:土石混合体边坡在地震作用下首先在坡脚处出现剪切破坏,随作用时间增加逐渐在顶部产生拉裂破坏,最终形成完整的破坏带;土石混合体边坡的滑面受石块位置制约,具有“绕石现象”;在相同地震荷载作用下,土石混合体边坡破坏区贯通比等效均质土坡慢,最终产生的永久位移比等效均质土坡产生的永久位移小,块石的存在增加了土石混合体边坡的抗剪强度,提高了其稳定性。

    Abstract:

    At present,the dynamic analysis of slope mainly focuses on soil slope or rock slope,but ignores soil-rock mixture slope which is a special geomaterial slope. However,few studies have simplified the soil-rock mixture slope into equivalent homogeneous soil slope,ignoring the existence of block rock. By using digital image processing technology,a meso-structure model of an actual soilrock mixture slope is established,and the deformation and stability of equivalent homogeneous soil slope and soil-mixture slope under seismic load are analyzed and compared by using the dynamic analysis module of FLAC3D software. The following conclusions are drawn:the soil-rock mixture slope first appears shear failure at the foot of the slope under earthquake;then gradually develops tensile failure at the top with the increase of action time;finally forms a complete failure zone. The sliding surface of the soil-rock mixture slope is restricted by the position of the rock and has the phenomenon called stone-winding phenomenon. Under the same seismic load,the failure zone of soil-rock mixture slope is slower than that of the equivalent soil slope,and the final permanent displacement is smaller than that of the equivalent soil slope. The existence of block stones increases the shear strength and stability of soil-rock mixture slope.

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刘康琦,刘红岩.地震作用下土石混合体边坡稳定性分析研究∗[J].防灾减灾工程学报,2022,(1):224-230

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  • 在线发布日期:2022-03-30
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