防灾减灾工程学报2018，Vol.38Issue(1)：185-192,8.DOI:10.13409/j.cnki.jdpme.2018.01.025
地震断裂带深孔岩芯非弹性应变恢复法三维地应力测试
Inelastic Strain Recovery Method to Determine 3D In-situ Stress of the Deep Hole Core in Earthquake Fault
摘要
Abstract
Wenchuan Fault Scientific Drilling (WFSD) is the quickest earthquake fault drilling project in the world.When borehole caving and hydraulic fracturing methods can hardly be implemented,the corebased method,i.e.the inelastic strain recovery method,is first used to determine three-dimensional insitu stress in deep drilling wells.Based on the theory of inelastic strain recovery of viscoelastic body and core testing principle,the inelastic deformation of deep hole core under three-dimensional in-situ stress is simulated,and the magnitudes and directions of the three principal stresses are calculated under the assumption of isotropy.In the laboratory of WFSD project site,the developed testing systems are used to test the normal strains with six independent directions of inelastic recovery strain of the deep drill core,and to determine the magnitudes and directions of three-dimensional in situ stresses at the measure point.In order to validate the inelastic strain recovery method,the test results of the No.1 hole of WFSD project have been analyzed,which are compared with those obtained by focal mechanism solutions and other stress measurement method.The results show that the inelastic strain recovery method is reasonable and reliable,especially under complicated geological conditions when other stress testing methods can not be used.The proposed method can obtain reliable data with good adaptability,which provides a new way for carrying out in-situ stress measurement by using the core method under the deep drilling conditions.关键词
汶川地震/大陆科学钻探/岩芯/非弹性应变/地应力Key words
Wenchuan earthquake/continental scientific drilling/core/inelastic strain/in-situ stress分类
天文与地球科学引用本文复制引用
王锦山,彭华..地震断裂带深孔岩芯非弹性应变恢复法三维地应力测试[J].防灾减灾工程学报,2018,38(1):185-192,8.基金项目
国家科技支撑计划项目(2008WFSD-03)资助 （2008WFSD-03）
