考虑干湿效应的土工织物–残积土界面静动力剪切特性

doi:10.3724/1000-6915.jrme.2025.0039

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摘要土工织物广泛应用于残积土边坡加固与防护，而不同干湿条件下土工织物–残积土界面静动力剪切特性尚不明晰。开展考虑干湿效应的土工织物–花岗岩残积土界面单调剪切试验和界面循环剪切试验，描述织土界面剪切应力–位移关系、界面抗剪强度指标、界面剪切刚度等指标随干湿次数、干湿幅度的发展过程与演化机制。结果表明：在单调剪切下，织土界面粗糙度随干湿效应增强而逐渐增大；相较于干湿幅度，干湿次数对织土界面强度指标影响更为显著。在循环剪切下，经历干湿作用后织土界面滞回曲线形态随剪切次数增长而逐渐外扩，界面剪切刚度逐渐增长，界面阻尼比逐渐下降，循环剪切次数对织土界面强度指标的影响较小，而干湿次数是影响织土界面循环剪切模量的主要因素；相较于界面内摩擦角，界面黏聚力受循环剪切历史的影响更为明显。同时，反复干湿历程会造成花岗岩残积土自身结构性削弱以及织土界面咬合作用增强，而循环剪切过程会造成织土界面粗糙度下降，这也较好地解释了不同干湿历程下土工织物–花岗岩残积土界面剪切特性先增强后衰减的现象。

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	冯雨泉1
	朱锐1
	2
	3
	周峰1
	郭万里3
	张凌凯4
	王梦玲1

关键词 ：土力学, 干湿效应, 花岗岩残积土, 土工织物, 单调剪切, 循环剪切

Abstract：Geotextiles are extensively employed for slope reinforcement in granite residual soil regions. However, the static and dynamic shear characteristics of geotextile-granite residual soil interfaces under wet-dry conditions remain inadequately understood. This study conducted monotonic and cyclic shear tests on the interface between geotextile and granite residual soil, considering wet-dry effects. The shear stress-displacement relationships, shear strength parameters, and shear stiffness variations were analyzed with respect to wet-dry cycles and amplitudes. The results indicate that during monotonic shear processes, interface roughness progressively increases with wet-dry cycles. The wet-dry cycle has a more pronounced impact on the strength parameters of the geotextile-soil interface compared to the wet-dry amplitude. With the increasing number of shear cycles, the hysteresis curve of the geotextile-soil interface expands outward, and the interface shear stiffness increases, while the damping ratio decreases. Cyclic shear cycles have a limited effect on strength parameters, whereas wet-dry cycles primarily influence the cyclic shear modulus. Cohesion is more significantly affected by cyclic shear history than the internal friction angle. Additionally, repeated wet-dry processes weaken the structural integrity of granite residual soil and enhance the interlocking action of the geotextile-soil interface. The cyclic shear process can reduce the roughness of the geotextile-soil interface, which explains the observed trend of initially increasing and subsequently decreasing interface shear characteristics under varying wet-dry histories.

Key words： soil mechanics wet-dry effects granite residual soil geotextile monotonic shear cyclic shear

引用本文:

冯雨泉1，朱锐1，2，3，周峰1，郭万里3，张凌凯4，王梦玲1. 考虑干湿效应的土工织物–残积土界面静动力剪切特性[J]. 岩石力学与工程学报, 2025, 44(6): 1658-1670.
FENG Yuquan1, ZHU Rui1, 2, 3, ZHOU Feng1, GUO Wanli3, ZHANG Lingka4, WANG Mengling1. Study on static and dynamic shear characteristics of geotextile- residual soil interface considering wet-dry effect. , 2025, 44(6): 1658-1670.

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https://rockmech.whrsm.ac.cn/CN/10.3724/1000-6915.jrme.2025.0039 或 https://rockmech.whrsm.ac.cn/CN/Y2025/V44/I6/1658

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