峰前卸荷损伤大理岩的动静力学特性试验研究

doi:10.13722/j.cnki.jrme.2018.1414

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摘要深部巷(隧)道开挖将导致围岩卸荷损伤甚至破裂，这类损伤破裂围岩还将承受后继采掘活动带来的静态扰动和动力冲击，继续破裂甚至破坏失稳，因此，有必要开展损伤破裂围岩再承载力学行为的研究。首先开展3级围压(15，25，35 MPa)条件下的大理岩峰前卸荷试验，每级围压分4个卸荷点，共制备72个损伤破裂岩样；然后，分别采用MTS815试验机和分离式Hopkinson压杆对损伤岩样进行静、动态单轴压缩破坏试验。试验结果表明：相同围压(或卸荷点)下，岩样卸荷损伤变量与卸荷点(或围压)呈正相关关系；卸荷损伤岩样的静、动态宏观力学参数均随损伤变量的增加而呈负指数函数衰减，且脆性破坏特征趋于不明显。损伤变量小于其临界值Dc = 0.17时，动态增强因子稳定在1.5左右，动弹性模量快速下降而静弹性模量变化不显著；损伤变量大于Dc时，动态增强因子急剧增大，而动、静态弹性模量则趋于一致。这种动静态的差异性是卸荷损伤效应和应变率效应复杂的耦合作用导致的。研究结论对深部巷(隧)道围岩力学参数的选取和支护方案的优化有一定借鉴意义。

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	朱子涵1
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	蔚立元1
	孟庆彬1
	靖洪文1
	苏海健1
	付安琪1
	2

关键词 ：岩石力学, 峰前卸荷试验, 损伤破裂, 动静载, 力学特性

Abstract：Excavation of tunnels under deep high stress environment will induce unloading damage or even cracking of surrounding rock and，then，the damaged surrounding rock will rupture or fail under static and dynamic loads caused by mining activities. Therefore，it is necessary to study the dynamic and static mechanical behavior of damaged surrounding rock. Pre-peak unloading tests on 72 damaged marble specimens were performed under three confining pressures of 15，25 and 35 MPa with four unloading points respectively corresponding to 70%，80%，90% and 100% of each confining pressure，and then，static and dynamic uniaxial compression tests of the damaged samples were respectively carried out by MTS815 and split Hopkinson pressure bar(SHPB) test system. The test results show that the damage variable of the rock samples increases with increasing the unloading point/confining pressure under the same confining pressure/unloading point. The static and dynamic compressive strength and elastic modulus of the unloading damaged rock samples decrease with the damage variable in a negative exponential function. When the damage variable is lower than the critical value Dc = 0.17，the dynamic enhancement factor keeps stable around 1.5. The dynamic elastic modulus decreases rapidly while the static elastic modulus does not change significantly. When the damage variable is greater than 0.17，the dynamic enhancement factor increases sharply while the dynamic and static elastic moduli tend to be the same. The dynamic and static differences are attributed to the complex coupling of unloading damage effect and strain rate effect. The findings of this research can provide a reference for the selection of the mechanical parameters of the surrounding rock and the optimization of the support scheme.

Key words： rock mechanics pre-peak unloading damage-fracture dynamic and static loads mechanical properties

引用本文:

朱子涵1，2，蔚立元1，孟庆彬1，靖洪文1，苏海健1，付安琪1，2. 峰前卸荷损伤大理岩的动静力学特性试验研究[J]. 岩石力学与工程学报, 2019, 38(4): 747-756.
ZHU Zihan1，2，YU Liyuan1，MENG Qingbin1，JING Hongwen 1，SU Haijian1，FU Anqi1，2. Experimental study on dynamic and static characteristics of marble considering pre-peak unloading damage. , 2019, 38(4): 747-756.

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http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2018.1414 或 http://www.rockmech.org/CN/Y2019/V38/I4/747

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