大理岩峰前卸荷损伤表征及再承载破坏耗能特征

doi:10.13722/j.cnki.jrme.2020.0411

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摘要深部高地应力条件下，地下工程开挖的强卸荷效应将导致围岩损伤甚至破裂。这类损伤破裂围岩是保障工程长期安全稳定的主要承载体，因此对其再承载能力的研究至关重要。利用MTS815.3试验系统开展卸荷点为70，80和90 MPa的恒轴压卸围压试验，每级卸荷点设置3个卸围压速率(0.1，0.5和1.0 MPa/s)，共得到损伤破裂试样27块，然后再对其进行单轴压缩再承载试验。恒轴压卸围压过程中，耗散能密度与卸荷点正相关，与卸荷速率负相关，卸荷点的影响更大；损伤变量D随耗散能密度增加而增大。再承载试验结果表明，损伤破裂试样的破坏应变随D增加呈指数函数增大，其破坏耗能特征以Dc = 0.10为界分为两阶段：D＜Dc时，吸收能密度、耗散能密度和弹性能密度随D增加趋于稳定，破坏形态以剪切破坏为主，伴随少量张拉裂纹，碎块块度较大、数量较少；D＞Dc时，耗散能密度占比急剧升高，弹性能密度和吸收能密度快速减小，破坏形态以张拉破坏为主，碎块数量快速增加，并出现薄片状碎块。研究结论对深部地下工程围岩力学参数选取和支护方案优化有一定借鉴意义。

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	李景龙1
	朱子涵1
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	蔚立元2
	白继文1
	隋斌1
	孟庆彬2
	张站群2

关键词 ：岩石力学, 峰前卸荷, 损伤变量, 耗散能, 再承载破坏特征

Abstract：The strong excavation unloading under the high geo-stress conditions leads to damage or even failure of surrounding rock mass in deep underground engineering. As the main bearing structure of underground engineering，fracturing rock mass has significantly effect on engineering safety. It is necessary to study the energy dissipation characteristics of unloading damaged rock during reloading. Unloading damaged test was carried out by MTS815 test system. The unloading points were set as 70，80 and 90 MPa，and the unloading confining pressure rates were set as 0.1，0.5 and 1.0 MPa/s at each unloading point. Twenty-seven damaged specimens were obtained，on which uniaxial compress reloading test was performed. The unloading test results show that the dissipated energy density is positively correlated with the unloading point and negatively correlated with the unloading confining rate. The unloading point has greater influence on the dissipated energy density than unloading confining rate. The damage variable D increases with increasing the dissipative energy density. The uniaxial compress reloading test results show that the failure strain of specimens after unloading increases exponentially as D increases. The destruction and energy characteristics are divided into two stages with a threshold value of Dc = 0.10. When D＜Dc，the absorbed energy density，dissipated energy density and elastic energy density tend to be stable as the damage variable increases， and the failure mode of the unloading damaged sample is dominated by shear failure accompanied by a small amount of tensile cracks. When D> Dc，the proportion of the dissipated energy density increases sharply，while the elastic energy density and absorbed energy density decrease rapidly. The failure mode of the unloading damaged sample is mainly tensile failure. The fragment size is large and the quantity of fragments is small. This research is significant for the selection of mechanical parameters of surrounding rock and the optimization of support schemes in deep underground engineering.

Key words： rock mechanics pre-peak unloading damage variable dissipated energy failure characteristics

引用本文:

李景龙1，朱子涵1，2，蔚立元2，白继文1，隋斌1，孟庆彬2，张站群2. 大理岩峰前卸荷损伤表征及再承载破坏耗能特征[J]. 岩石力学与工程学报, 2020, 39(12): 2429-2438.
LI Jinglong1，ZHU Zihan1，2，YU Liyuan2，BAI Jiwen1，SUI Bin1，MENG Qingbin2，ZHANG Zhanqun2. Dissipative characteristics investigation of marble during reloading process considering pre-peak unloading damage. , 2020, 39(12): 2429-2438.

链接本文:

http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2020.0411 或 http://rockmech.whrsm.ac.cn/CN/Y2020/V39/I12/2429

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