砂岩加载试验峰后变形、破坏与应变能特征

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摘要为认识峰后破裂岩样在连续载荷作用下的变形、破坏特征及应变能变化情况，利用MTS815岩石力学试验系统，对永川煤矿砂岩样进行三轴等围压试验。在试验基础上提出岩样破裂比(r)概念，它反映峰后破裂岩样相对于完整岩样的破裂程度，r越小表示岩样破裂程度越高，r最大值为1，最小值为岩样残余强度与峰值强度之比。结果分析表明：低围压作用下破裂比与其对应割线模量、轴向应变量、应变能之间的线性关系较好；峰后破裂砂岩样在连续加载后，呈现“X”剪切破坏模式；岩石最大泊松比可通过峰后连续加载试验确定。研究结论对认识岩石突出和岩爆机制有重要意义。

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关键词 ：岩石力学, 破裂砂岩样, 破裂比, 循环加载, 变形, 破坏, 应变能

Abstract：In order to understand the characteristics of deformation，failure and strain energy of the fractured rock sample under continuous loading，triaxial compression tests of the sandstone sample from Yongchuan mine are carried out by a MTS815 rock testing system. Based on the experimental results，the fractured ratio(r) is developed，it reflects the ratio of the break between the fractured sample and the perfect sample，smaller r means the larger fracture for the rock sample，the maximum and the minimum value of r is 1 and the ratio of residual strength and peak strength. The results of this analysis showed that the fractured ratio has good linear relationship with the secant modulus，axial strain，Poisson?s ratio and strain energy；after continuous loading，the failure mode of fractured rock sample appears‘X’shear failure mode；the maximum of Poisson?s ratio of rock can be determined by the test under continuous loading. These conclusions have a great significance to understand the mechanism of rock outburst and rockburst.

Key words： rock mechanics fractured sandstone sample fractured ratio cycling loading deformation failure strain energy

收稿日期: 2010-09-04

引用本文:

郭臣业1，2，鲜学福1，姜永东1，王臣1. 砂岩加载试验峰后变形、破坏与应变能特征[J]. 岩石力学与工程学报, 2011, 30(S2): 3892-3898.
GUO Chenye1，2，XIAN Xuefu1，JIANG Yongdong1，WANG Chen1. CHARACTERISTICS OF DEFORMATION，FAILURE AND STRAIN ENERGY OF SANDSTONE UNDER CYCLING LOADING IN POST-PEAK. , 2011, 30(S2): 3892-3898.

链接本文:

http://www.rockmech.org/CN/Y2011/V30/IS2/3892

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