Micro-characteristics of granite impinged by abrasive water jet from a mineralogical perspective  

作　　者：Zhongtan Li Zhaolong Ge Qinglin Deng Zhe Zhou Lei Liu Jianming Shangguan Chuanfu Shao 

机构地区：[1]State Key Laboratory of Coal Mine Disaster Dynamics and Control,Chongqing University,Chongqing,400044,China [2]School of Resources and Safety Engineering,Chongqing University,Chongqing,400044,China

出　　处：《Journal of Rock Mechanics and Geotechnical Engineering》2025年第2期1008-1017,共10页岩石力学与岩土工程学报(英文)

基　　金：supported by the Postdoctoral Fellowship Program of CPSF(Grant No.GZC20233326);the Chongqing Science Fund for Distinguished Young Scholars(Grant No.CSTB2022NSCQJQX0028);the National Natural Science Foundation of China(Grant Nos.U23A20597,52274112).

摘　　要：An abrasive water jet(AWJ)is commonly used to develop deep geothermal resources,such as drilling in hot dry rock(HDR).The influence of rock mineral properties,such as mineral types,mineral contents,and grain size,on the formation of perforation by AWJ is unclear yet.In this study,we investigate AWJ impacts on three types of granite samples with different mineral fractions using a polarizing microscope and scanning electron microscope(SEM).The results show that when the grain size is doubled,the perforation depth increases by 16.22%under the same type of structure and properties.In general,fractures are more likely to be created at the position of rough surfaces caused by abrasive impact,and the form of fractures is determined by the mineral type.In addition,microstructure analysis shows that transgranular fractures typically pass through large feldspar particles and quartz removal occurs along mineral boundaries.The longitudinal extension of perforation depends mainly on the strong kinetic energy of the jet,while the lateral extension is controlled by the backflow.The results contribute to a better understanding of the process involved in the breaking of hard rock by abrasive jets during deep geothermal drilling.

关 键 词：Abrasive water jet(AWJ) DRILLING Hot dry rock(HDR) PERFORATION Fracture generation Removal mechanism 

分 类 号：TU45[建筑科学—岩土工程]