基岩面倾角对沿其滑动的土坡后缘裂缝特征的影响研究

doi:10.3724/1000-6915.jrme.2024.0672

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摘要后缘裂缝的位置往往是土质滑坡后缘边界的位置。本文旨在研究基岩面倾角对沿其滑动的土坡后缘裂缝特征的影响。首先开展12组沿基岩面滑动的土坡的后缘裂缝试验，然后提出后缘裂缝位置的理论计算方法，最后利用该方法计算12个试验滑坡和2个实际滑坡的裂缝位置。结果表明：12组试验后缘裂缝倾角的变化范围为63.7°～78.1°。随着基岩面倾角逐渐增大，后缘裂缝面逐渐由以张拉破坏为主转变为以剪切破坏为主，故后缘裂缝的倾角逐渐减小。理论方法将滑坡视为滑面由两部分(较缓的底滑面和较陡的后缘裂缝面)组成的受力体，底滑面表现为剪切破坏，后缘裂缝面则表现为“上部张拉、下部剪切”的破坏形式。无论对于试验滑坡还是实际滑坡，理论方法计算得到的后缘裂缝位置与实际位置总体偏差不大。研究成果有助于准确定位此类滑坡的后缘裂缝。

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	饶云康1
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	杨涛2
	陈怀林2
	张哲2

关键词 ：边坡工程, 土质滑坡, 后缘裂缝, 基岩面, 张拉破坏, 剪切破坏, 滑面

Abstract：The position of the trailing edge crack is often the location of the boundary of the trailing edge in a soil landslide. This paper aims to explore the effect of bedrock-surface inclination on the characteristics of the trailing edge crack in a soil landslide sliding along the bedrock surface. Twelve laboratory tests on trailing edge cracks in soil landslides along the bedrock surface are first conducted. A theoretical approach for calculating the position of the trailing edge crack is then proposed. The theoretical approach is finally applied to calculate the positions of trailing edge cracks in twelve laboratory landslides and two field landslides. The results show that the inclinations of the trailing edge cracks in the twelve laboratory tests range from 63.7° to 78.1°. As the bedrock-surface inclination increases，the failure mode of the trailing edge crack transitions from predominantly tensile failure to predominantly shear failure，resulting in a corresponding decrease in the inclination of the trailing edge crack. The proposed theoretical approach treats the landslide as a stressed body，with the slip surface divided into two parts：the bottom slip surface and the steeper trailing edge crack surface. The bottom slip surface exhibits shear failure. In contrast，the trailing edge crack surface exhibits tensile failure and shear failure at positions near and far from the slope surface，respectively. For both laboratory and field landslides，the overall deviation of the trailing edge crack positions calculated by the theoretical approach from the measured positions is not significant. The results of this study help to accurately locate the trailing edge crack in the landslide.

Key words： slope engineering soil landslide trailing edge crack bedrock surface tensile failure shear failure slip surface

引用本文:

饶云康1，2，杨涛2，陈怀林2，张哲2. 基岩面倾角对沿其滑动的土坡后缘裂缝特征的影响研究[J]. 岩石力学与工程学报, 2025, 44(4): 989-1000.
RAO Yunkang1，2，YANG Tao2，CHEN Huailin2，ZHANG Zhe2. Effect of bedrock-surface inclination on characteristics of trailing edge crack in soil landslide sliding along the bedrock surface#br#. , 2025, 44(4): 989-1000.

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https://rockmech.whrsm.ac.cn/CN/10.3724/1000-6915.jrme.2024.0672 或 https://rockmech.whrsm.ac.cn/CN/Y2025/V44/I4/989

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