| Mechanical properties and failure characteristics of fractured sandstone with grouting and anchorage简 |
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| 作者姓名： | Zong Yijiang Han Lijun Qu Tao and Yang Shengqi |
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| 摘 要： |
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| 收稿时间： | 24 September 2013 |
Mechanical properties and failure characteristics of fractured sandstone with grouting and anchorage |
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| Zong Yijiang,Han Lijun,Qu Tao and Yang Shengqi.Mechanical properties and failure characteristics of fractured sandstone with grouting and anchorage[J].Mining Science and Technology,2014,24(2):165-170. |
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| Affiliation: | 1. State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining & Technology, Xuzhou 221008, China;2. Jiangsu Jianzhu Institute, Xuzhou 221116, China;3. Shanxi Electric Power Exploration & Design Institute, Taiyuan 030001, China;1. Geotechnical & Structural Engineering Research Center, Shandong University, 250061 Jinan, Shandong, PR China;2. School of Civil Engineering, Shandong University, 250061 Jinan, Shandong, PR China;3. School of Civil Engineering and Mechanics, Huazhong University of Science and Technology, 430074 Wuhan, Hubei, PR China;4. Jinan Rail Transit Group Co., Ltd, 250101 Jinan, Shandong, PR China;1. College of Computer Science, Sichuan University, Chengdu 610064, PR China;2. College of Computer Science and Information Technology, Yunnan Normal University, Kunming 650092, PR China;3. Department of Computer Science and Engineering, Konkuk University, Seoul 143-701, Republic of Korea |
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| Abstract: | Based on uniaxial compression experimental results on fractured sandstone with grouting and anchorage, we studied the strength and deformation properties, the failure model, crack formation and evolution laws of fractured sandstone under different conditions of anchorage. The experimental results show that the strength and elastic modulus of fractured sandstone with different fracture angles are significantly lower than those of intact sandstone. Compared with the fractured samples without anchorage, the peak strength, residual strength, peak and ultimate axial strain of fractured sandstone under different anchorage increase by 64.5–320.0%, 62.8–493.0%, and 31.6–181.4%, respectively. The number of bolts and degree of pre-stress has certain effects on the peak strength and failure model of fractured sandstone. The peak strength of fractured sandstone under different anchorage increases to some extent, and the failure model of fractured sandstone also transforms from tensile failure to tensile–shear mixed failure with the number of bolts. The pre-stress can restrain the formation and evolution process of tensile cracks, delay the failure process of fractured sandstone under anchorage and impel the transformation of failure model from brittle failure to plastic failure. |
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| Keywords: | Fractured rock mass Anchorage properties Peak strength Crack propagation Failure characteristics |
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