不同围压及循环载荷下砂岩的渗流、力学特性试验研究

doi:10.13722/j.cnki.jrme.2022.0241

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摘要为探究深部煤层底板滞后突水机制，明晰开采过程中底板岩层的渗流、力学特性，基于Rock Top多场耦合试验仪对砂岩开展不同围压(20，30，40 MPa)及循环载荷作用下的应力–渗流耦合试验研究。结果表明：(1) 岩石在循环载荷作用下全应力–应变曲线可以分为5个阶段，即原生微裂隙压缩闭合阶段、弹性压缩阶段、裂纹稳定发展阶段、裂纹快速发展阶段及峰后变形破坏阶段；(2) 不同围压条件下，循环载荷试验下岩石峰值强度较常规三轴压缩试验小幅减小，但应力–应变曲线出现了明显滞后现象；(3) 随着循环载荷次数的增加，耗散能逐渐降低，初次循环时加载阶段弹性模量随轴向应力差的增大呈现阶段性减小的特点；(4) 同一静水压条件下，砂岩破坏后较破坏前的渗透率明显增大，且随着卸荷水平的增加，渗透率增量与增长率变化规律相一致；(5) 不同围压及循环载荷作用下，峰前渗透率随应力差的增大呈现阶段性变化，峰后渗透率随应力差的减小明显降低；(6) 不同围压及循环载荷作用下，砂岩主要表现为剪切破坏，且随着卸荷水平的增加，破坏程度增大，20 MPa围压下均表现为单一剪切破坏，30，40 MPa围压循环载荷作用下则出现了以贯通剪切裂纹为主、次生张拉裂纹为辅的裂纹网络。

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	张培森1
	2
	许大强1
	2
	张睿1
	2
	张晓乐1
	2
	董宇航1
	2
	慕卫丽1

关键词 ：岩石力学, 循环载荷, 渗流特性, 力学特性, 破坏特征

Abstract：In order to explore the lagging water inrush mechanism of deep coal seam floor and to clarify the seepage and mechanical characteristics of floor strata during mining，the Rock Top multi-field coupling tester was used to carry out stress-seepage coupling experiment of sandstone under different confining pressures(20，30，40 MPa) and cyclic loading. The results show that：(1) The complete stress-strain curve of rock under cyclic loading can be divided into five stages，including primary micro-fracture compression closure stage，elastic compression stage，crack stable development stage，crack rapid development stage and post-peak deformation failure stage；(2) Under different confining pressures，the peak strength of rock under cyclic loading decreases slightly compared with that under conventional triaxial compression，but the stress-strain curve shows obvious hysteresis；(3) With the increase of the number of cyclic loads，the dissipation energy periodically decreases，and the elastic modulus gradually decreases with the increase of the axial stress difference during the first cycle；(4) Under the same hydrostatic pressure，the permeability of sandstone after failure increases significantly compared with that before failure，and with the increase of the unloading level，the permeability increment is consistent with the growth rate；(5) Under different confining pressures and cyclic loads，the pre-peak permeability changes periodically with the increase of the stress difference，and the post-peak permeability decreases obviously with the decrease of the stress difference；(6) Under different confining pressures and cyclic loads，sandstone mainly shows shear failure，and with the increase of the unloading level，the degree of damage increases. Under 20 MPa confining pressure，sandstone shows a single shear failure. Under the cyclic load of 30 MPa and 40 MPa confining pressure，there is a crack network dominated by through shear cracks and supplemented by secondary tension cracks.

Key words： rock mechanics cyclic load seepage characteristics mechanics characteristics failure characteristics

引用本文:

张培森1，2，许大强1，2，张睿1，2，张晓乐1，2，董宇航1，2，慕卫丽1. 不同围压及循环载荷下砂岩的渗流、力学特性试验研究[J]. 岩石力学与工程学报, 2022, 41(12): 2432-2450.
ZHANG Peisen1，2，XU Daqiang1，2，ZHANG Rui1，2，ZHANG Xiaole1，2，DONG Yuhang1，2，MU Weili1. Experimental study on seepage and mechanical properties of sandstone under different confining pressures and cyclic loads . , 2022, 41(12): 2432-2450.

链接本文:

http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.0241 或 http://rockmech.whrsm.ac.cn/CN/Y2022/V41/I12/2432

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