干湿循环对深部粉砂岩蠕变特性影响的试验研究

doi:10.13722/j.cnki.jrme.2017.0711

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摘要为探究围岩含水率变化对深部岩体长期稳定性的影响，以朱集东煤矿－906 m处粉砂岩为研究对象，借助ZYSS2000型岩石高温高压蠕变仪，采用分级加载方式，对不同干湿循环次数粉砂岩试件开展单轴压缩蠕变试验。试验结果表明，随干湿循环次数增多，粉砂岩轴向蠕变应变和轴向稳态蠕变速率呈非线性增大，瞬时变形模量呈对数降低，且轴向蠕变应变和轴向稳态蠕变速率在1次干湿循环后出现较大增幅，瞬时变形模量在干湿循环0～1次阶段劣化度最大，为10.06%；不同干湿循环作用后的粉砂岩试件在最后一级应力作用下发生蠕变破坏的规律基本一致，且在相同的破坏应力下，随干湿循环次数的增多，粉砂岩试件蠕变破坏全程历时逐渐减小，减速蠕变段和加速蠕变段占全程历时的比例逐渐升高；粉砂岩的长期强度随干湿循环次数的增多逐渐降低，且在1次循环以后出现较大的降幅；粉砂岩的蠕变破坏特征随干湿循环次数增多呈现出由张拉破坏向剪切破坏转化。

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	马芹永1
	郁培阳1
	袁璞1
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关键词 ：岩石力学, 干湿循环, 分级加载, 单轴压缩蠕变, 破坏形态

Abstract：In order to investigate the influence of moisture content on the long-term stability of deep rock，the siltstone from －906 m of Zhujidong coalmine was studied. A series of uniaxial compressive creep tests of cyclic wetting and drying on the siltstone were carried out in stepped loading on the rock creep testing machine ZYSS2000 under high temperature and high pressure. The test results show that with increasing of wetting and drying cycles，the axial creep strain and axial steady creep rate of siltstone increase nonlinearly，while the instantaneous deformation modulus decreases logarithmically. The axial creep strain and axial steady creep rate increase significantly after the first wetting and drying cycle. The degree of deterioration of the instantaneous deformation modulus from 0 to 1 stage is the biggest which is 10.06%. The creep failure curve of siltstone under various wetting and drying cycles present similar regularities under the last level of stress. With the increasing of the number of wetting and drying cycles，the whole time for creep failure of siltstone decrease gradually under the certain failure stress，while the proportion of transient creep stage and accelerated creep stage in the whole time increase gradually. The long-term strength of siltstone decreases gradually with the increasing of the number of wetting and drying cycles. The largest reduction occurs after the first wetting and drying cycle. The creep failure characteristics of siltstone present a transformation from tension failure to shear failure.

Key words： rock mechanics cyclic wetting and drying step-loading uniaxial compressive creep failure modes

引用本文:

马芹永1，郁培阳1，袁璞1，2. 干湿循环对深部粉砂岩蠕变特性影响的试验研究[J]. 岩石力学与工程学报, 2018, 37(3): 593-600.
MA Qinyong1，YU Peiyang1，YUAN Pu1，2. Experimental study on creep properties of deep siltstone under cyclic wetting and drying. , 2018, 37(3): 593-600.

链接本文:

http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2017.0711 或 http://www.rockmech.org/CN/Y2018/V37/I3/593

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