不同入渗边界条件下简单均质砂土边坡失稳模型试验和数值模拟研究

doi:10.13722/j.cnki.jrme.2023.0756

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摘要在实践中很多边坡工程常因功能需求呈现出复杂不同的入渗边界情景，但往往易被忽视。通过开展不同入渗情景(坡顶入渗、坡面入渗、全面入渗)的室内降雨边坡模型试验，借助DIC图像技术，捕捉暴雨诱发边坡失稳破坏的初始微小变形和宏观整体渐变位移，并结合CFD-DEM数值模拟，提取暴雨诱发边坡剪切带、接触力链的渐变云图，揭示不同入渗情景下简单均质砂土边坡的失稳灾变机制。结果表明：坡顶入渗易先引发坡脚破坏，而后沿坡面向上扩展，最终导致整体滑移破坏，其前期稳定阶段较长但破坏具有突发性，破坏形态呈上宽下窄的弧形态；坡面入渗易在坡肩和坡脚首先发生塑性变形，二者不断扩展并引发牵引式滑移破坏，破坏周期较长，呈上窄下窄中间宽的弧形状；全面入渗易引发整体破坏，具有突发性、直线型特点，破坏形态呈上宽下宽中间宽的形态。3种情景中，坡顶入渗导致边坡的破坏距离和破坏深度最大，其次是全面入渗，而坡面入渗最小。在相同降雨强度下，坡顶入渗因破坏周期较短且具有突发性，要比坡面入渗更加危险。此外，边坡每次破坏后易在滑移面后边缘形成应力集中的力链拱，表明边坡破坏后会呈现出一定的自稳性。

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	宋享桦1
	2
	谭勇2
	3
	陆烨4
	刘俊岩1
	刘燕1
	韦华周5
	赖科5
	许泽6

关键词 ：边坡工程, 降雨, 砂土边坡, 模型试验, CFD-DEM流固耦合, 入渗边界

Abstract：In practice，many slope projects usually present complex infiltration boundaries due to functional requirements. In this paper，a series of physical experiments about rainfall slopes with different infiltration scenarios (rainfall covering slope crest only，slope surface only，and both slope crest and surface) were carried out. DIC image technology was used to capture the initial micro deformations and macroscopic overall asymptotic displacements during the slope failure. The contour maps of shear zones and contact force-chains were extracted，and the failure mechanism of high permeable soil slopes under different infiltration scenarios was revealed by the CFD-DEM numerical simulation. The results show that the rainfall covered slope crest only is easy to cause the failure of the slope toe first，then spread upward along the slope surface，and finally lead to the overall slip failure with the failure pattern of wide at the top and narrow at the toe. It had longer stability period，while its failure had characteristic of suddenness. When the rainfall covered slope surface only，plastic deformation was prone to occur first near the slope crown and slope toe. As two deformation areas continuously expanded and connected，it triggered the retrogressive failure with longer period. Its failure pattern presented narrow at the top，narrow at the bottom，and wide in the middle. When the slope covered by the full-area rainfall，overall failure was prone to triggered directly with characteristics of suddenness and linearity. Its failure pattern presented wide on the top，wide on the bottom，and wide in the middle. The scenario of rainfall covered slope crest only had the largest failure distance and failure depth，followed by the rainfall covered both slope crest and surface，while the scenario of rainfall covered slope surface only had the smallest failure distance and failure depth. The scenario of rainfall covered slope crest only was more dangerous than scenario of rainfall covered slope surface only due to the shorter failure period and sudden failure. In addition，the phenomenon of force-chain arch is prone to form at the back edge of the slip surface after the slope failure，indicating that the slope has the ability of self-stability.

Key words： slope engineering rainfall sandy slope physical experiment CFD-DEM coupling simulation infiltration scenarios

引用本文:

宋享桦1，2，谭勇2，3，陆烨4，刘俊岩1，刘燕1，韦华周5，赖科5，许泽6. 不同入渗边界条件下简单均质砂土边坡失稳模型试验和数值模拟研究[J]. 岩石力学与工程学报, 2024, 43(5): 1204-1218.
SONG Xianghua1，2，TAN Yong2，3，LU Ye4，LIU Junyan1，LIU Yan1，WEI Huazhou5，LAI Ke5，XU Ze6. Experimental and numerical studies on the instability of simple homogeneous sandy slopes under different infiltration scenarios. , 2024, 43(5): 1204-1218.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2023.0756 或 http://rockmech.whrsm.ac.cn/CN/Y2024/V43/I5/1204

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