文献类型：会议论文

英文题名：Frictional properties of the stressed limestone fracture

作者：Zhong, Z.[1]; Elsworth, D.[2]; Hu, Y.J.[1]

机构：[1] Shaoxing University, No.5 Huancheng West Road, Shaoxing, 312000, China; [2] Pennsylvania State University, 201 Old Main, Pennsylvania, 16802-5000, United States

会议论文集：13th ISRM International Congress of Rock Mechanics

会议日期：May 10, 2015 - May 13, 2015

会议地点：Montreal, QC, Canada

语种：英文

外文关键词：Creep - Fracture - Lime - Limestone - Rock mechanics - Rock pressure

外文摘要：A standard triaxial apparatus was set up to perform sliding tests. Slide-hold-slide (SHS) tests, with hold times from 10 to 3000s and at invariant effective confining pressures of 1MPa, incremented to 3MPa and then 5MPa, were conducted on both dry and wet split limestone samples to study the evolution of fracture friction under holding and sliding processes. Limestone fracture shows time-dependent behaviors in SHS tests, friction drops (creep) gradually during hold periods, and recovers (healing) after re-slide. Frictional healing and creep increment are proportional with hold times, while are inversely proportional with effective confining pressures. Moreover, the wet sample displays heavier healing than the dry one, whereas creep increment of the wet sample is lighter than the dry one. We conclude that the evolution of limestone fracture friction is significantly controlled by mechanisms of fluid-rock interactions. ? 2015 by the Canadian Institute of Mining, Metallurgy & Petroleum and ISRM.