Strength predictions for jointed rocks in confined and unconfined states |
| |
| Affiliation: | 2. Civil Engineering Department, Indian Institute of Technology, Delhi, New Delhi 110016, India;3. Civil Engineering Department, Regional Engineering College, Kurukshetra, India;1. School of Resources and Safety Engineering, Central South University, Changsha 410083, China;2. State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China;3. School of Nuclear Resources Engineering, University of South China, Hengyang 421001, China;4. Power China Zhongnan Engineering Corporation Limited, Changsha 410014, Hunan, China;5. School of Highway, Chang''an University, Xi''an 710064, China;1. School of Resources and Safety Engineering, Central South University, Changsha, Hunan 410083, China;2. School of Civil, Environmental and Mining Engineering, The University of Western Australia, Perth 6009, Australia;1. School of Civil Engineering, Central South University, Changsha, Hunan 410075, China;2. Key Laboratory of Heavy-Haul Railway Engineering Structure, Ministry of Education, Central South University, Changsha, Hunan 410075, China;3. Key Laboratory of Transportation Tunnel Engineering, Ministry of Education, Southwest Jiaotong University, Chengdu 610031, China;4. Department of Geotechnical Engineering, School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China;1. School of Resources and Safety Engineering, Central South University, Changsha 410083, China;2. State Key Laboratory for GeoMechanics and Deep Underground Engineering, China University of Mining & Technology, Xuzhou 221116, China;1. Geological Survey of Israel, Jerusalem, Israel;2. Department of Geological and Environmental Sciences, Ben-Gurion University of the Negev, Beer Sheva, Israel;1. College of Civil Engineering and Architecture, Hainan University, Haikou 570228, China;2. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China |
| |
| Abstract: | Most of the rational approaches to the design of structures on or in a rock mass are based on the strength response of the rock mass. Realizing this important aspect, the present investigation was undertaken to understand the strength response of jointed rocks. The objective was achieved by simulating joints in intact isotropic rock cores in the laboratory.Three materials, namely, plaster of Paris, Jamrani sandstone and Agra sandstone were selected. The intact specimens of these materials provided a wide range of compressive strength (σci = 11.3−110MN/m2). A special technique was devised to develop joints varying in number and inclination. In all, about 250 uniaxial compressive strength (UCS) tests and 1300 triaxial tests on jointed and intact specimens of these materials were conducted. Based on this extensive experimentation, a joint factor Jf, has been evolved to account for the number of joints per metre length, inclination of the sliding joint and the shear strength along this joint. This factor is found to be uniquely related to the ratio of compressive strength of jointed rock to that of the intact rock irrespective of the type of rock. A strength criterion for jointed rocks is proposed and the parameters defining this criterion can be evolved simply by knowing the joint factor, compressive strength of intact rock and triaxial strength of intact specimens at two convenient confining pressures. The empirical relations developed have been verified with similar data for other jointed rocks and model materials. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
