压密试验后破碎岩石的透水系数试验研究-西安建筑科技大学学报（自然科学版）

文章信息/Info

Title:: Experimental study on the coefficient of permeability of broken rock specimens after compaction test

作者:: 雷鸣1; 羽柴公博2; 福井胜利2; 大久保诚介2; (1. 江苏圣泰实田环境修复有限公司,211106;2. 东京大学工学系研究科,日本东京 113 –8656)

Author(s):: LEI Ming1HASHIBA Kimihiro 2FUKUI Katsunori2OKUBO Seisuke 2; (1. In Situ Solution China Co. Ltd , Nanjing, 211106; 2. Department of Systems InnovationThe University of TokyoTokyo, 1138656)

Keywords:: rock; compaction test; excavation disturbed zone; coefficient of permeability; damage-healing

摘要:: 本文通过室内试验研究探讨了破碎岩石压密后试样的透水系数降低．对于田下凝灰岩、来待砂岩、河津凝灰岩、三城目安山岩、本小松安山岩5种岩石，在MTS伺服试验机下压碎空心钢制圆筒中的岩石试样，并持续加载压密至指定的最大轴向荷载．卸载后将钢制圆筒取出置于自制的试验装置中，利用变水头透水试验求解压密后试样的透水系数．试验结果表明，压密后的岩石试样的透水系数变小，透水系数的对数值与压密试验中的最终的轴向应变成反比例关系，且与压密试验中最大轴向应力/完整岩石单轴抗压强度的比值的对数值成反比例关系．挖掘扰动区内的部分岩石在满足一定的支护条件下，强度恢复和渗透性降低是值得期待的．研究结果可以为建立挖掘扰动区损伤恢复模型提供参考依据．

Abstract:: Strength healing of compacted rock in the Excavation Disturbed Zone (EDZ) has been verified through field observation and laboratory test. Tage tuff, Kimachi sandstone, Kawazu tuff, Sanjome andesite and Honkomatsu andesite were employed to investigate water permeability of the compacted rocks in this study. Firstly, rock specimens were broken in a hollow steel cylinder under the MTS servo testing machine, and then loaded to the predetermined axial load. Following the unloading, the cylinder was placed in the self-made falling head permeability test device. Coefficients of permeability of the compacted rock specimens were obtained through falling head permeability test. From the experimental data, it can be concluded that coefficients of permeability of the co mpacted rock specimens decrease after the compaction test. There exists an inverse semi-logarithmic relationship between coefficients of permeability of the compacted rock specimens and the ultimate axial strain in the compaction test. Furthermore, there is also an inverse logarithmic relationship between the coefficients of permeability and the ratio of maximum axial stress to uniaxial compressive strength of intact specimens for the five rock types. For some rocks in the EDZ ，strength healing and decrease of water permeability were expected after being properly supported . These experimental results may be helpful in build ing a damage-healing model for rocks in the EDZ