静载对节理煤岩体动态力学特性和应力波传播的影响

doi:10.13722/j.cnki.jrme.2021.0891

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摘要为研究地应力和节理作用下煤岩体的动态力学特性和应力波传播规律，利用改造的动静组合加载SHPB装置，针对人工构造节理试样，研究不同静载(0，2，4，6和8 MPa)和不同节理吻合系数(JMC：0.8，0.9，1.0和无节理)煤样的动态力学特性和应力波传播规律。试验结果表明：随节理吻合系数减小，反射波振幅呈现增大趋势，透射波振幅呈现降低趋势；随着静载从0 MPa增大到8 MPa，不同节理吻合系数试样的透射系数均呈现增大趋势，且节理吻合系数越小，透射系数增加值越大，静载对低节理吻合系数试样的透射系数影响更为明显；峰值应力随静载增大而增大，而峰值应变反之；节理比刚度和动态模量均随静载增大呈现增长的趋势，表明静载的存在抑制节理煤岩体劣化作用。基于应力–应变关系和标准线性固体模型分析验证了试验结果，随静载和节理吻合系数增大，地震波品质因子增大，试样耗散能量减少。研究认为在地下工程中应更为重视节理和静载共同对应力波传递特性的影响。

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	殷志强1
	王建恩2
	张卓3
	常聚才2
	史文豹2

关键词 ：岩石力学, 节理, 静载, 节理吻合系数, 应力波, 地震波品质因子

Abstract：To investigate the dynamic mechanical properties and stress wave propagation law of coal rock mass under the action of in-situ stress and joints，the dynamic compression tests of coal rock under different static loads (0，2，4，6 and 8 MPa) and different joint coincidence coefficients(JMC：0.8，0.9，1.0 and no joint) were carried out on modified split Hopkinson pressure bar(SHPB) coupled static and dynamic loads by using artificial joint specimen. The results show that，with the decrease of joint match coefficients，the amplitude of the reflected wave increases，and the transmitted wave decreases. With the static load increased from 0 MPa to 8 MPa，the transmission coefficients of samples with different joint match coefficients increase，and the smaller the joint match coefficients，the greater the increase of transmission coefficient. The influence of static load on the transmission coefficient of samples with low joint match coefficients was more obvious. The peak stress increases with the increase of static load，while the peak strain decreases with the increasing static load. The specific stiffness and dynamic modulus of the joint specimen increase with the increasing static load. It shows that the existence of static load inhibits the deterioration of jointed coal and rock mass. Based on the stress-strain relationship and the standard linear solid model，the experimental results are verified. With the increase of static load and joint coincidence coefficients，the seismic wave quality factor increases，and the sample dissipated energy decreases. It is considered that more attention should be paid to the influence of joint and static load on the transmission characteristics of stress waves in underground engineering.

Key words： rock mechanics joint static load contact area ratio stress wave seismic wave quality factor

引用本文:

殷志强1，王建恩2，张卓3，常聚才2，史文豹2. 静载对节理煤岩体动态力学特性和应力波传播的影响 [J]. 岩石力学与工程学报, 2022, 41(S2): 3152-3162.
YIN Zhiqiang1，WANG Jianen2，ZHANG Zhuo3，CHANG Jucai2，SHI Wenbao2. Influence of static load on dynamic mechanical properties and stress wave propagation of jointed coal rock masses. , 2022, 41(S2): 3152-3162.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2021.0891 或 http://rockmech.whrsm.ac.cn/CN/Y2022/V41/IS2/3152

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