Investigating the effects of the moisture content of filling and shear rate on the shear characteristics of rock-like materials with joint

IF 5.7 2区工程技术 Q1 ENGINEERING, MECHANICAL Engineering Failure Analysis Pub Date : 2025-02-12 DOI:10.1016/j.engfailanal.2025.109411

Yunjin Hu, Chenxing Tian, Caijun Shao, Yong Niu

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Abstract

Rock joints in fault zones are commonly filled with fault gouge, where clay fillings are common. Until now, the shear characteristics of filled rock joints under different moisture contents and shear rates have not been well understood. This work investigates the mechanical behaviour of rock-like materials with clay-filled joints under compression-shear loading. A self-developed rock shear test system was used to conduct direct shear tests on rock-like materials under three normal stresses and five shear rates. Six types of natural red clay with different moisture contents were selected for filling. The coupling effects of the moisture content and shear rate on the mechanical properties of rock-like samples with clay-filled joints were investigated. Furthermore, the failure characteristics of the failure surfaces of rock-like materials after shearing were scanned via 3D scanning. The test results show that the moisture content of fillings and shear rate significantly affect the shear characteristics of rock-like materials with filled joints. The plastic limit moisture content is a critical point where the shear rate has the least effect on the shear strength. Under dry soil filling conditions, the degree of shear damage on the shear plane is the smallest. The present results can provide guidance for slope protection projects.

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研究了充填体含水率和剪切速率对含节理类岩材料剪切特性的影响

断裂带中的岩石节理通常被断层泥填充，其中粘土填充物很常见。到目前为止，对不同含水率和剪切速率下充填岩体节理的剪切特性还没有很好的了解。本文研究了含粘土充填节理的类岩石材料在压剪荷载作用下的力学行为。采用自行研制的岩石剪切试验系统，对类岩石材料在3种正应力、5种剪切速率下进行了直接剪切试验。选取6种不同含水率的天然红粘土进行填充。研究了含水率和剪切速率对含粘土填缝类岩石试样力学性能的耦合效应。利用三维扫描技术对类岩材料剪切后破坏面破坏特征进行了扫描。试验结果表明，充填体含水率和剪切速率对充填节理类岩材料的剪切特性有显著影响。塑性极限含水率是剪切速率对抗剪强度影响最小的临界点。干土充填条件下，剪切面上的剪切破坏程度最小。研究结果对边坡防护工程具有一定的指导意义。

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来源期刊

Engineering Failure Analysis 工程技术-材料科学：表征与测试

CiteScore

7.70

自引率

20.00%

发文量

956

审稿时长

47 days

期刊介绍： Engineering Failure Analysis publishes research papers describing the analysis of engineering failures and related studies. Papers relating to the structure, properties and behaviour of engineering materials are encouraged, particularly those which also involve the detailed application of materials parameters to problems in engineering structures, components and design. In addition to the area of materials engineering, the interacting fields of mechanical, manufacturing, aeronautical, civil, chemical, corrosion and design engineering are considered relevant. Activity should be directed at analysing engineering failures and carrying out research to help reduce the incidences of failures and to extend the operating horizons of engineering materials. Emphasis is placed on the mechanical properties of materials and their behaviour when influenced by structure, process and environment. Metallic, polymeric, ceramic and natural materials are all included and the application of these materials to real engineering situations should be emphasised. The use of a case-study based approach is also encouraged. Engineering Failure Analysis provides essential reference material and critical feedback into the design process thereby contributing to the prevention of engineering failures in the future. All submissions will be subject to peer review from leading experts in the field.