Effects of desiccation cracks and vegetation on the shallow stability of a red clay cut slope under rainfall infiltration
Effects of desiccation cracks and vegetation on the shallow stability of a red clay cut slope under rainfall infiltration
复制标题
降雨入渗条件下干燥裂缝和植被对红粘土路堑边坡浅层稳定性的影响
DOI：
10.1016/j.compgeo.2021.104436
复制
发表时间：
2021-09-06
影响因子：
5.3
通讯作者：
Shi, Zhen-Ning
中科院分区：
文献类型：
--
作者：
Gao, Qian-Feng;Zeng, Ling;Shi, Zhen-Ning
红粘土是我国南方广泛分布的一种易开裂的赤红壤。裂隙红粘土边坡在降雨条件下常表现为浅部破坏，用有限元方法模拟具有挑战性。本研究旨在探讨乾燥裂缝与植被对红黏土路堑边坡在降雨期间浅层稳定性之影响。利用有限元软件ABAQUS建立了边坡的数值模型，提出了一种有效的方法来模拟干化裂缝的分布。数值模型和方法的可靠性进行了验证，对实地调查。通过参数分析，研究了降雨参数、裂隙参数和植被参数对边坡稳定性的影响。结果表明，干化裂缝的存在会引起边坡的浅层破坏，大大降低边坡的安全系数。这表明控制裂缝的发展对维护边坡的安全至关重要。此外，根系长度大于0.5m的植被可以明显提高破裂边坡的稳定性。主根系统似乎比须根系统表现得更好。然而，浅根植被也可以通过抑制干燥裂缝的形成而有助于边坡的浅层稳定性。
Red clay, an easily cracking lateritic soil, is extensively distributed in southern China. Cracked red clay slopes often show shallow failures under rainfall, which is challenging to reproduce by finite element methods. This study aims to examine how desiccation cracks and vegetation affect the shallow stability of a red clay cut slope during rainfall. Numerical models of the slope are created using ABAQUS, and an effective approach is proposed to simulate the distribution of desiccation cracks. The reliability of the numerical models and approaches is validated against field surveys. Parametric analysis is then conducted to investigate the influences of rainfall parameters, crack parameters and vegetation parameters on the slope stability. The results demonstrate that the presence of desiccation cracks can cause shallow failure and greatly reduce the factor of safety of the slope. This indicates that control of crack development is important to maintain slope safety. Moreover, the stability of cracked slopes can be obviously improved by vegetation with roots longer than 0.5 m. A tap root system appears to perform better than a fibrous root system. However, shallow-rooted vegetation may also contribute to the shallow stability of the slope by restraining the formation of desiccation cracks.