Fundamental Theroy and Experimental Research

Model study of frictional healing of limestone fracture: The role of pressure solution and stress corrosion

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  • 1. College of Civil Engineering, Shaoxing University, Shaoxing, Zhejiang 312000, China; 2. Centre of Rock Mechanics and Geological Disaster, Shaoxing University, Shaoxing, Zhejiang 312000, China; 3. Rock Mechanics Laboratory, The Pennsylvania State University, State College, PA, 16802-5000, USA; 4. China Harbour Engineering Co., Ltd., Beijing 100027, China

Received date: 2014-12-12

  Online published: 2018-06-14

Supported by

Project supported by the National Natural Science Foundation of China (Grant No. 51279177 and 51509154) and Scientific Research Startup Foundation of Shaoxing University (Grant No. 20145016 and 20145016).

Abstract

A coupled model including the combination of pressure solution model and stress corrosion model is proposed to simulate the observed strength recovery of limestone fracture. Thus, the coupled model can consider both pressure solution and stress corrosion in modification of the fracture contact area, which is used to predict the frictional healing of the fracture. The simulation results show that the pressure solution model underestimates frictional healing during short hold times, and with extending the hold times, the simulated results of the pressure solution model obviously increase with the growth of temperature, whereas the results are slightly influenced by the effective confining stress. Generally, the stress corrosion model reflects the growth of fracture contact area caused by compaction. Therefore, the coupled model can simulate the frictional healing well observed from Slide-Hold-Slide (SHS) tests. In conclusion, the stress corrosion model should be considered, when the pressure solution model is employed to simulate the frictional healing, especially under short hold times and at low temperatures when the domain effects are mechanical.

Cite this article

ZHONG Zhen , GAO Hui-cai , XIE Chang-fei, . Model study of frictional healing of limestone fracture: The role of pressure solution and stress corrosion[J]. Rock and Soil Mechanics, 2015 , 36(12) : 3410 -3416 . DOI: 10.16285/j.rsm.2015.12.010

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