准静态应变率下单轴煤岩特征应力确定方法研究

doi:10.13722/j.cnki.jrme.2020.0321

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摘要基于准静态应变率[10－5，10－2] s－1范畴下芙蓉白皎煤岩单轴压缩试验，开展不同应变率下煤岩变形破坏过程的能量演化规律分析，提出利用能量耗散率曲线和横向应变差确定单轴煤岩特征应力的新方法，并分析准静态应变率范畴下的变化规律。研究结果表明，不同应变率下的煤岩能量演化可划分为裂隙闭合、线弹性及裂隙快速扩展3个阶段，能量耗散率曲线均呈现峰前阶段先升后降再升的趋势。利用该趋势，根据能量耗散率曲线，将曲线的极大值点与极小值点分别确定为裂纹闭合应力点与损伤应力点，结合获得的损伤应力点，计算横向应变差后确定裂纹的起裂应力点。比较不同应变率下煤岩的特征应力与峰值应力之比，3个应力特征比值均随着应变率的增加呈降低的趋势。最后对比分析单轴煤岩特征应力确定传统方法的局限性及新方法的合理性、准确性，提出特征应力应变率效应研究的工程意义。

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	刘晓辉1
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	郝齐钧2
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	郑钰2

关键词 ：岩石力学, 煤岩, 准静态应变率, 特征应力, 能量耗散理论

Abstract：Based on uniaxial compression tests of Furong Baijiao coal rock under quasi-static strain rate[10－5，10－2] s－1，the energy evolution law of coal rock deformation and failure process under different strain rates was analyzed. A new method for determining the characteristic stress of coal rock by using energy dissipation rate curve and lateral strain difference was proposed，and the variation law of the characteristic stress under the category of quasi-static strain was analyzed. The results show that the energy evolution of coal rock under different strain rates can be divided into three stages including crack closure，linear elasticity and rapid crack propagation，and the energy dissipation rate curves all show a trend of rising first，then falling and next rising in the pre-peak stage. The maximum and the minimum points of the energy dissipation rate curves are respectively defined as the crack closure stress and the damage stress ，and the lateral strain difference is calculated to determine the crack initiation stress combined with the obtained damage stress. The ratios of the characteristic stress to the peak stress of coal rock under different strain rates are compared，showing that all three ratios decrease with increasing the strain rate. Finally，the limitation of the traditional methods and the rationality and accuracy of the new method are compared and analyzed，and the engineering significance of the strain rate effect of the characteristic stress is proposed.

Key words： rock mechanics coal rock quasi-static strain rate characteristic stress energy dissipation theory

引用本文:

刘晓辉1，2，郝齐钧2，胡安奎1，2，郑钰2. 准静态应变率下单轴煤岩特征应力确定方法研究[J]. 岩石力学与工程学报, 2020, 39(10): 2038-2046.
LIU Xiaohui1，2，HAO Qijun2，HU Ankui1，2，ZHENG Yu2. Study on determination of uniaxial characteristic stress of coal rock under quasi-static strain rate. , 2020, 39(10): 2038-2046.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2020.0321 或 http://rockmech.whrsm.ac.cn/CN/Y2020/V39/I10/2038

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