水利学报2025，Vol.56Issue(12)：1594-1607,1619,15.DOI:10.13243/j.cnki.slxb.20250024
防渗墙槽段接缝界面剪切力学特性研究
Shear mechanical characterization of joint interfaces of cut-off wall panels
摘要
Abstract
The joints between cut-off wall panels are prone to shear deformation under high hydraulic gradients and dynamic hydraulic forces during dam operation.To investigate the shear mechanical properties of the joint interface,an experimental cut-off wall was constructed on-site downstream of the Shiziping Dam.Undisturbed samples contain-ing joints were extracted for laboratory direct shear tests.Combined with high-precision 3D laser scanning technol-ogy,a three-dimensional roughness evaluation method considering anisotropy was proposed,and a new model for the peak shear strength of the interface was established.The results indicate that normal stress,roughness,and the strength of the concrete matrix significantly influence the shear strength and failure modes of the cut-off wall joint interface.The new peak shear strength model demonstrates clear effectiveness and superiority.Under high normal stress conditions,the primary failure mode of the joint interface is shear-off failure,and the influence of roughness on the dilatancy effect is weakened.Under low normal stress conditions,the primary failure mode is dilatant shear failure.The new model can more accurately predict the shear mechanical properties of the cut-off wall panel joint interfaces,reasonably account for the different failure modes of the joint interface,and provide theoretical support for the safety assessment of cut-off walls.关键词
防渗墙/槽段接缝/剪切强度/三维粗糙度/剪切强度模型Key words
cut-off wall/panel joint/shear strength/three-dimensional roughness/shear strength model分类
建筑与水利引用本文复制引用
廖明可,王刚,金伟,孙亮..防渗墙槽段接缝界面剪切力学特性研究[J].水利学报,2025,56(12):1594-1607,1619,15.基金项目
国家重点研发计划课题(2024YFF1700601) （2024YFF1700601）
