In-situ stress measurement based on Kaiser effect and differential strain analysis method and regional in-situ stress distribution research
ZHAO Long
QIAO Wei
CHENG Xianggang
HE Hu
MENG Xiangsheng
ZHANG Yusheng
SUN Wenjie
REN Yangyang
XIAO Chong
Abstract：In previous practice,the differential strain analysis(DSA)method,relied upon for estimating vertical principal stress to re-solve geological stress,has shown limitations in reliability.Drawing upon observations of the Kaiser effect in rock samples,we intro-duce the Kaiser-differential strain analysis(Kaiser-DSA)method,amalgamating the Kaiser effect with the DSA method to assess in-situ stress differentials.Comparative evaluation with the stress relief method reveals that the Kaiser-DSA method demonstrates min-imal relative error and generally consistent orientation of the maximum horizontal principal stress.Utilizing the findings from in-situ stress testing,this investigation scrutinizes the distribution patterns of in-situ stress in Yaojie Mining Area and investigates the caus-ative factors contributing to the prevailing in-situ stress field.The study elucidates that Yaojie Mining Area is subject to the influ-ence of compressive tectonic stress fields,resulting in elevated residual stress.Influenced by the Qinghai-Tibet thrust nappe action and the clockwise shear action of the F19 fault,the geostress field in this region predominantly manifests a strike-slip stress state typi-fied by σH>σv>σh.Furthermore,the heightened differential stress within this locale exacerbates deformation and damage to the sur-rounding rock mass during mining activities,thereby exacerbating the frequency of dynamic disaster events.
Keywords：Kaiser effectdifferential strain analysisin-situ stress measurementYaojie Mining Arearegional tectonic evolution
Publication Date：2024-10-20
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：9( 91-99 )