不同围压与冻结温度下白垩系红砂岩力学性质试验研究

doi:10.13722/j.cnki.jrme.2018.0780

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摘要西部立井冻结法施工中，冻结壁岩体受到温度场及地应力场的耦合作用。为研究白垩系红砂岩在地应力与温度耦合作用下冻结后的力学性质，利用围压模拟地应力条件，在不同的温度(20 ℃，－5 ℃，－10 ℃，－15 ℃)及围压(0，2，4，6，8 MPa)下对红砂岩试样进行冻结处理，并在相同的围压下测试其冻结后的三轴力学性质，分析冻结围压及冻结温度对红砂岩冻结力学性质的影响，并就红砂岩冻结过程中地应力的影响机制进行初步探讨。试验结果表明，冻结时的围压可以提高红砂岩的冻结程度，红砂岩强度、弹性模量相对无围压冻结增加，泊松比下降。随温度降低，红砂岩的黏聚力、内摩擦角、起裂及扩容应力水平均随温度的降低而增加，但黏聚力增加幅度更大。红砂岩冻结后，弹性阶段相对变长，塑性阶段变短，塑性变形储备能力不足。对于多孔弱胶结的红砂岩，冻结过程中的地应力可以提高岩石孔隙的约束能力，抵抗冻胀变形，使冻结作用可以尽可能向次级微孔隙发展。研究结果为西部地区煤矿立井冻结壁厚度及掘进段高设计提供了指导。

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	刘波1
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	马永君1
	盛海龙1
	邓和浪1
	韩茜1
	曹英杰1

关键词 ：岩石力学, 白垩系, 冻结红砂岩, 围压, 温度, 力学参数

Abstract：Rock masses in the frozen wall are subjected to coupling actions of the temperature and the crustal stress during the construction of mine shafts using the artificial freezing technology. To investigate the mechanical properties of Cretaceous red sandstone after freezing under the coupling action of the crustal stress and the temperature，triaxial compression tests with frozen samples were carried out under different temperatures of 20 ℃，－5 ℃，－10 ℃ and －15 ℃ and different confining pressures of 0，2，4，6 and 8 MPa，and the influence of the confining pressure and the temperature on the mechanical properties of red sandstone during freezing process was discussed. Test results demonstrate that the confining pressure during the freezing process enhances the freezing effect modestly，namely，compared with the case without the confining pressure during the freezing process，the strength and the elastic modulus of the red sandstone increase while Poisson?s ratio decreases. With decreasing the temperature，the cohesion，the internal friction angle，the crack initiation and dilatation stresses of the red sandstone increase，and the cohesion has a higher sensibility to the temperature. It is also revealed that，after freezing，the red sandstone has a comparative longer elastic stage and the reserve capacity for plastic deformation is not adequate. The crustal stress enhances the restraining capacity of pores so as to resist the damage caused by the frost heaving force，which makes the freezing action develop to the secondary micro-cracks. The study results help for the design of the thickness of the frozen wall and the section height of mine shafts in Western China.

Key words： rock mechanics Cretaceous frozen red sandstone confining pressure temperature mechanical parameters

引用本文:

刘波1，2，马永君1，盛海龙1，邓和浪1，韩茜1，曹英杰1. 不同围压与冻结温度下白垩系红砂岩力学性质试验研究[J]. 岩石力学与工程学报, 2019, 38(3): 455-466.
LIU Bo1，2，MA Yongjun1，SHENG Hailong1，DENG Helang1，HAN Qian1，CAO Yingjie1. Experimental study on mechanical properties of Cretaceous red sandstone under different freezing temperatures and confining pressures. , 2019, 38(3): 455-466.

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http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2018.0780 或 http://www.rockmech.org/CN/Y2019/V38/I3/455

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