蚀变花岗岩物理力学特性试验研究

Experimental Investigation on Physical and Mechanical Properties of Altered Granite

为进一步分析蚀变花岗岩的稳定性,针对蚀变花岗岩的强度特性,选取矿山井下开挖现场的岩样测试了不同蚀变程度岩样的矿物成分、孔隙率、耐崩解性、点荷载强度等参数,进行了部分参数与蚀变花岗岩强度的相关性分析。结果表明,1#岩样较2#、3#岩样有更优良的物理力学性能;矿物成分中,石英和长石含量对1#岩样强度影响较大,绿泥石和蒙脱石含量对2#岩样强度影响较大;蚀变花岗岩强度随密度的增加呈线性增长;含水率、吸水率、孔隙率的增大会使强度降低,其值较小时,对蚀变花岗岩强度的影响较大;耐崩解系数的增大会使强度增强,其值较大时对强度影响较大。

In order to study the strength properties of altered granite rocks,the samples were selected from the mine underground excavation site. The physical parameters of mineral composition,porosity,slake durability and point load strength were tested on those samples with different altered-degrees. Then the correlation between the physical parameters and the strength properties of altered granite rocks was analyzed. The results showed that the physical and mechanical properties of sample 1^#were better than those of samples 2^#and 3^#. Among the mineral compositions,quartz and feldspar had greater influence on the strength of sample 1^#,while chlorite and montmorillonite had greater influences on the strength of samples 2^#. The rock strength of altered granite increased linearly with the increase of density,while the strength decreased with the increase of moisture content,water absorption and porosity. Greater effect on the rock strength was revealed when those parameter was in a lower values range. In another aspect,the increase of slake durability was benefit to the rock strength and the effects on the strength would be more obvious when those parameter was in a higher value range. The results could provide experimental supports for the further analysis of stability of altered granite rocks.