水利水电技术（中英文）2026，Vol.57Issue(7)：255-273,19.DOI:10.13928/j.cnki.wrahe.2026.07.019
不同含水状态下层理灰岩变角剪切力学特性及微震信号特征研究
Variable-angle shear mechanical properties and microseismic signal characteristics of bedded limestone under different water-bearing states
摘要
Abstract
[Objective]The stability and failure modes of bedding rock slopes are closely related to the shear mechanical behavior of layered rock masses.To thoroughly reveal the underlying mechanisms,the effects of different shear angles and water-bearing states on the shear mechanical behavior of bedded limestone are investigated.[Methods]Variable-angle shear tests were conducted,combining with digital image correlation(DIC)and microseismic monitoring techniques,on bedded limestone specimens under both natural and saturated water-bearing states at different shear angles(30°～60°).Their mechanical properties,strain field evolution,and microseismic signal characteristics were systematically studied.[Results]The result demonstrated that:(1)with increasing shear angle,the peak shear stress,normal stress,and shear stress of the specimens gradually decreased,while the failure mode transitioned from shear fracture of the rock matrix to slip along the bedding planes.(2)At lower shear angles,the specimens tended to develop shear-tensile composite fractures with relatively fragmented failure patterns.As the shear angle increased,the effects of normal stress weakened,and the failure mode gradually transformed into a single slip mode dominated by shear along the bedding planes.(3)Under the natural state,microseismic activity exhibited a clear sequence of"active-quiet-precursor-mainshock"with high signal peaks,indicating typical brittle failure.Under the saturated state,the lubricating effects of water caused microseismic activity to remain continuously active,but the signal peaks were significantly lower,demonstrating microseismic signal characteristics of a transition from brittle to plastic failure.(4)The shear angle dominated the macroscopic deformation and failure mode of bedded limestone specimens.At lower angles,microseismic activity was dispersed with high cumulative counts,while at higher angles,microseismic precursor signals became concentrated with a significant quiet period,[Results]ing in more sudden failure.[Conclusion]The research findings provide theoretical and data support for stability evaluation and disaster early warning of bedding rock slopes under rainfall conditions by revealing the variable-angle shear mechanical properties and microseismic signal characteristics of bedded limestone under different water-bearing states.关键词
层理灰岩/变角剪切/剪切角度/含水状态/力学特性/微震信号特征/降雨/灾害预警Key words
bedded limestone/variable-angle shear/shear angle/water-bearing state/mechanical properties/microseismic signal characteristics/rainfall/disaster early warning分类
天文与地球科学引用本文复制引用
张勇,李麟玮,安友豪,王凯,向喜琼,廖德武..不同含水状态下层理灰岩变角剪切力学特性及微震信号特征研究[J].水利水电技术（中英文）,2026,57(7):255-273,19.基金项目
国家自然科学基金项目(42367022) （42367022）
贵州省科技计划项目(黔科合支撑[2023]一般127,黔科合基础-ZK[2023]一般066) （黔科合支撑[2023]一般127,黔科合基础-ZK[2023]一般066）
