Experimental investigation on the relevance of mechanical properties and porosity of sandstone after hydrochemical erosion  

作　　者：CAI Yan-yan YU Jin FU Guo-feng LI Hong CAI Yan-yan YU Jin FU Guo-feng LI Hong(Fujian Research Center for Tunneling and Urban Underground Space Engineering,Huaqiao University;School of Civil and Hydraulic Engineering,Dalian University of Technology)

机构地区：[1]Fujian Research Center for Tunneling and Urban Underground Space Engineering, Huaqiao University, Xiamen361021, China [2]School of Civil and Hydraulic Engineering, Dalian University of Technology, Dalian116024, China

出　　处：《Journal of Mountain Science》2016年第11期2053-2068,共16页山地科学学报（英文）

基　　金：supported by the National Basic Research Program of China (973 Program) (Grant No.2011CB013503);the National Natural Science Foundation of China (Grant No.51374112,51679093);the Promotion Program for Young and Middle-aged Teacher in Science and Technology Research of Huaqiao University (ZQNPY112,ZQN-PY311)

摘　　要：Under the effect of chemical etching,the macroscopic mechanical properties,mesoscopic structure,mineral content,and porosity of rocks undergo significant changes,which can lead to the geological disasters; thus,an understanding of changes in the microscopic and macroscopic structure of rocks after chemical etching is crucial.In this study,uniaxial mechanical tests and nuclear magnetic resonance(NMR) spectroscopy were carried out on sandstone samples that had been previously subjected to chemical erosion under different p H values.The aim was to study changes in properties and mechanical characteristics,including deformation and strength characteristics,of the rock,and microscopic pore variation characteristics,and to perform preliminary studies of the chemical corrosion mechanism.Results show that different chemical solutions have a significant influence on the uniaxial compressive strength,the axial strain corresponding to the peak axial stress,elastic modulus,etc.With the passage of time,porosity increases gradually with exposure to different chemical solutions,and exposure to chemical solutions results in large changes in the NMR T2 curve and T2 spectrum area.Sandstone exposed to different chemical solutions exhibits different corrosion mechanisms; the root cause is the change of mineral.

关 键 词：Chemical erosion HYDROCHEMISTRY Mechanical properties Nuclear magnetic resonance POROSITY SANDSTONE 

分 类 号：TU45[建筑科学—岩土工程]