Failure mechanism of boulder-embedded slope under excavation disturbance and rainfall
Failure mechanism of boulder-embedded slope under excavation disturbance and rainfall
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DOI：
10.1007/s10064-023-03369-z
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发表时间：
2023-08
影响因子：
4.2
通讯作者：
Xiang Yu;Tao Zhao;Bin Gong;Chun’an Tang
中科院分区：
文献类型：
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作者：
Xiang Yu;Tao Zhao;Bin Gong;Chun’an Tang
由于岩石风化的不均匀性，边坡内部可能存在漂石，使边坡的变形破坏机制非常复杂。通过分析某嵌岩边坡在开挖与降雨交替作用下的失稳特征，提出了两种典型的失稳模式，卵石失稳和土体失稳。对于土体失稳，可能发生三种破坏过程，包括漂石上方的滑动面、漂石下方的滑动面和与漂石相交的滑动面。同时，在不同的破坏阶段，土与漂石之间的相互作用也会发生变化。通过现场监测和数值模拟，研究了边坡的滑动变形、破坏机制和土-漂石相互作用。结果表明，孤石起到了抗滑作用，阻挡了深层滑动面的形成，导致了研究边坡浅层土体失稳和局部大变形。此外，在边坡滑动变形过程中，土体会先后出现三个破坏过程，由于孤石的阻碍作用，土体会沿着孤石底部或顶部滑动。
Due to the uneven weathering of rocks, boulders can exist inside a slope, making the deformation and failure mechanism of the slope very complex. By analyzing the failure characteristics of a boulder-embedded slope under alternating excavation and rainfall, two classical instability modes are proposed, i.e., boulder instability and soil instability. For the soil instability, three failure processes may occur, including the sliding surface above the boulder, the sliding surface below the boulder, and the sliding surface intersecting the boulder. Meanwhile, the interaction between soil and boulder can also vary during different failure phases. Furthermore, the slope sliding deformation, failure mechanism, and soil-boulder interaction are investigated by on-site monitoring and numerical simulation. The results show that the boulders play an anti-sliding role and block the formation of deep sliding surface, resulting in the shallow soil instability and local large deformation of the studied slope. Besides, during the slope sliding deformation, three failure processes of the soils appear one after another, and the soils may slide along the bottom or top of the boulders because of the hindering effect of the boulders.