| 冻结饱水单裂隙岩体力学特性试验研究 |
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| 引用本文： | 杨昊,张晋勋,单仁亮,武福美,郭志明.冻结饱水单裂隙岩体力学特性试验研究[J].岩土力学,2018,39(4):1245-1255. |
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| 作者姓名： | 杨昊 张晋勋 单仁亮 武福美 郭志明 |
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| 作者单位： | 1. 北京城建集团有限责任公司博士后工作站，北京 100088；2. 中国矿业大学 力学与建筑工程学院，北京 100083 |
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| 基金项目： | 国家自然科学基金资助项目(No. 41572270)。 |
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| 摘 要： | 通过相似单裂隙岩体冻结三轴试验，研究裂隙倾角、迹长、隙宽、围压和温度对单裂隙岩体力学特性的影响，试验结果表明：裂隙岩体力学参数与倾角呈二次函数分布，与迹长呈指数函数分布，通过拟合式（3）可近似计算岩体强度；岩体强度与围压呈线性分布，负温条件下泊松比和弹性模量受围压影响较小；隙宽小于0.1 mm或大于0.8 mm时，岩体强度随隙宽增大而减小，隙宽在0.1～0.8 mm之间时，岩体力学参数几乎不受隙宽影响；岩体强度随温度降低而增大的作用机制是岩体孔隙水和裂隙水冻结成冰，增大了颗粒间的凝聚力和摩擦角；裂隙倾角影响破裂面的起始位置，迹长影响破裂面的扩展规模，围压影响破裂面的延伸方向；倾角对岩体强度影响最大，迹长次之，温度影响最小。
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| 关 键 词： | 单裂隙岩体 裂隙产状 冻结温度 力学性质 |
| 收稿时间： | 2016-05-03 |
Experimental study on mechanical properties of frozen saturated single fractured rock mass |
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| YANG Hao,ZHANG Jin-xun,SHAN Ren-liang,WU Fu-mei,GUO Zhi-ming.Experimental study on mechanical properties of frozen saturated single fractured rock mass[J].Rock and Soil Mechanics,2018,39(4):1245-1255. |
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| Authors: | YANG Hao ZHANG Jin-xun SHAN Ren-liang WU Fu-mei GUO Zhi-ming |
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| Institution: | 1. Postdoctoral Workstation, Beijing Urban Construction Group Co., Ltd., Beijing 100088, China; 2. School of Mechanics and Civil Engineering, China University of Mining and Technology, Beijing 100083, China |
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| Abstract: | In this paper, a series of triaxial compression experiments was performed to investigate the effects of fracture dip, trace length, gap width, confining pressure and temperature on mechanical properties of the single-fractured rock mass. Experimental results show that the mechanical parameters of rock mass exhibit the quadratic function with dips and the exponential distribution with trace length, respectively. Moreover, the fitting formula (3) is employed to calculate rock mass strength approximately. It is found that rock mass strength linearly increases with the confining pressure. However, Poisson ratio and elastic modulus under negative temperature are independent of the confining pressure. The strength of rock mass decreases with the increase of gap width when it is less than 0.1 mm or greater than 0.8 mm. However, mechanical parameters are irrelevant to the gap width when it locates between 0.1 mm and 0.8 mm. Water, existing in pores and fractures, freezes under negative temperature so that both the cohesion and friction angle between rock particles are increased. Hence, the change of water form is the reason why the rock mass strength increases with reducing temperature. Results also show that the fracture angle affects the initial position of failure surface, the trace length affects the expansion scale of failure surface, and the confining pressure influences the extension direction of failure surface. In addition, the crack dip is the most sensitive influencing parameter to the strength of rock mass, followed by trace length, with the least temperature. |
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| Keywords: | single-fractured rock fracture morphology frozen temperature mechanical properties |
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