Experimental study on strain field evolution around a simulated thrust fault  

作　　者：Yonghong Zhao Yanjun Xiao Jiaying Yang Xiaofan Li Andong Xu 

机构地区：[1]School of Earth and Space Sciences,Peking University,Beijing 100871,China [2]State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development,Beijing 100083,China [3]SinoPEC Key Laboratory of Seismic Elastic Wave Technology,Beijing 100083,China [4]SinoPEC Petroleum Exploration and Production Research Institute,Beijing 100083,China

出　　处：《Earthquake Science》2023年第1期40-51,共12页地震学报（英文版）

基　　金：This research was supported by the National Key R&D Program of China(Nos.2018YFC1504203 and SQ2017YFSF040025).

摘　　要：Earthquakes result from continuous geodynamic processes.A topic of significant interest for the scientific community is to elaborate on the phenomena governing the faulting and fracturing of crustal rocks.Therefore,in this study,uniaxial compressive shear failure experiments were conducted on Fangshan marble rock samples with a prefabricated slot to simulate thrust faulting.The center of each marble plate(105 mm × 80 mm × 5 mm) was engraved with a 30-mm long double-sided nonpenetrating slot(depth:2 mm,width:0.5 mm).The deformation and destruction processes of the rock surface were recorded using a high-speed camera.The digital image correlation method was used to calculate the displacement and strain distribution and variation at different loading stages.The accumulative and incremental displacement fields u and v,strain field exand e_(y),and shear strain e_(xy) were analyzed.When the loading level reached its ultimate value,the strain field was concentrated around the prefabricated slot.The concentration reached a maximum at the ends of the prefabricated slot.The magnitude of shear strain reached 0.1.This experiment contributes to our understanding of the dynamic process of active faulting.

关 键 词：experimental study deformation field evolution fracture process EARTHQUAKE 

分 类 号：P315[天文地球—地震学]