基于卸加载响应比的煤岩变形破坏研究
Research on Deformation and Failure of Coal Rock Based on Unload/Load Response Ratio
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摘要: 基于加卸载响应比理论,克服加卸载响应比的不足与局限,提出卸加载响应比的基本概念,推导卸加载响应比与弹性模量之间的关系。从损伤力学的基本理论出发,结合材料的弹性模量与损伤变量之间的关系,建立卸加载响应比与损伤变量之间的关系模型。然后,利用WE-100型万能材料试验机,对煤试样进行了单轴应力试验研究,结合煤试样的应力-应变曲线,计算卸加载响应比值并分析其变化趋势,从而得到在卸加载过程中煤试样的损伤情况。因此,基于煤岩的单轴应力试验,研究由煤岩变形破坏的应力-应变关系定义的卸加载响应比及其演化规律,用于预测煤岩的变形破坏程度是可行的。Abstract: According to the load/unload response ratio theory and its inadequacy and limitation, unload/load response ratio theory (ULRR for short) is introduced first in this paper, and the relationship between ULRR and elastic modulus E is obtained. Based on the basic theory of damage mechanics, the relationship between ULRR and damage variable D is set up and analyzed with the relationship between E and D. Using WE-100 type universal material tester, the stress-strain test of coal specimen is conducted. According to the stress-strain curve, unload/load response ratio and its change trends are calculated and analyzed in order to obtain the damage variable of coal specimen in the unloading and loading experiments. Therefore, for rock fracture experiment, it is feasible to utilize ULRR evolution laws defined by the stress-strain relationship to predict the rock damage extent.
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