Dynamic Properties of Intact Rock Samples Subjected to Cyclic Loading under Confining Pressure Conditions
Dynamic Properties of Intact Rock Samples Subjected to Cyclic Loading under Confining Pressure Conditions
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DOI：
10.1007/s00603-011-0151-8
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发表时间：
2011-04
影响因子：
6.2
通讯作者：
E. Liu;Si-ming He;X. Xue;J. Xu
中科院分区：
文献类型：
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作者：
E. Liu;Si-ming He;X. Xue;J. Xu
最近，人们的注意力集中在岩石的动态特性上，目的是了解它们在不同加载历史和条件下的动态力学特征(例如，斯塔夫罗金和塔拉索夫2001年；巴格德和佩特罗š，2009年)。研究人员对不同类型的岩石进行了研究，以考察加载效应和加载应变率对其强度和变形特性的影响(例如，赵2000；Cho等人)。2003；Mahmutoglu 2006；Wang等人。2009年；梁等人。2010)。关于循环载荷的更广泛的工作已经探索了岩石是否会受到疲劳的削弱(例如，Burdine 1963；Prost 1988；Singh；Tien等人)。1990年；Li et al.2001年；Fuenkajorn和Phueakphum，2010年)。上面引用的实验研究主要集中在加载速率或单轴循环加载对岩石样品的动态力学特性的影响(例如，Bagde和Petroš，2005年，2009年；Fuenkajorn和Phueakphum，2010年；梁等人)。2010年)，但很少有研究涉及在围压条件下承受循环载荷的岩石样品。在应用工程中遇到的岩体通常处于受力状态，并受压力的约束。因此，有必要研究围压对循环荷载作用下岩样动态力学特性的影响，这就是本文所进行的研究类型。本文对砂岩试件进行了轴向循环加载试验，以确定围压对砂岩动态残余变形和动态力学性能的影响。采用5种不同的围压水平(10、20、30、40和50 Mpa)进行轴向循环加载。最后，综合分析了围压对砂岩在循环荷载作用下的动力特性的影响。
Recently, attention has focused on the dynamic properties of rocks with the goal of understanding their dynamic mechanical features under different loading histories and conditions (eg, Stavrogin and Tarasov 2001; Bagde and Petroš 2009). Researchers have carried out studies on different types of rocks to examine the loading effects and loading strain rates on their strength and deformation characteristics (eg, Zhao 2000; Cho et al. 2003; Mahmutoglu 2006; Wang et al. 2009; Liang et al. 2010). More extensive work on cyclic loading has explored whether rocks are subject to weakening from fatigue (eg, Burdine 1963; Prost 1988; Singh 1989; Tien et al. 1990; Li et al. 2001; Fuenkajorn and Phueakphum 2010). The experimental studies cited above primarily focus on the influence of loading rates or uniaxial cyclic loading on the dynamic mechanical properties of rock samples (eg, Bagde and Petroš 2005, 2009; Fuenkajorn and Phueakphum 2010; Liang et al. 2010), but few studies have addressed rock samples subjected to cyclic loading under confining pressure conditions. Rock masses encountered in applied engineering are usually in a stressed state and are confined by pressure. Therefore, it is necessary to study the effects of confining pressures on the dynamic mechanical characteristics of rock samples upon cyclic loading, which is the type of study performed here. In this work, sandstone samples were subjected to axially cyclic loading to experimentally determine the effects of confining pressures on their dynamic residual deformation and dynamic mechanical properties. Five levels of confining pressure (10, 20, 30, 40 and 50 MPa) were applied for axial cyclic loading. Finally, the influence of confining pressures on the dynamic features of sandstone samples with cyclic loading was comprehensively analyzed.