| 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 |
| 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 |
| 投稿时间：2025-01-14 修订日期：2025-12-24 |
| DOI：10.13243/j.cnki.slxb.20250024 |
| 中文关键词: 防渗墙 槽段接缝 剪切强度 三维粗糙度 剪切强度模型 |
| 英文关键词: cut-off wall panel joint shear strength three-dimensional roughness shear strength model |
| 基金项目:国家重点研发计划课题（2024YFF1700601） |
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| 摘要点击次数: 13 |
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| 中文摘要: |
| 防渗墙槽段接缝在大坝服役期间的高水力坡降及动水力作用下易发生剪切变形。为探究防渗墙槽段接缝的剪切力学特性，采用实际的防渗墙施工设备在狮子坪大坝下游现场浇筑了试验防渗墙，切取防渗墙槽段接缝原状样进行室内直剪试验。结合高精度三维激光扫描技术，提出了考虑各向异性的三维粗糙度评价方法，建立了新的接缝界面峰值剪切强度模型。结果表明：法向应力、粗糙度和混凝土本体强度对防渗墙接缝界面的剪切强度和破坏形态均有影响；本研究建立的新的接缝界面峰值剪切强度模型具有明显的有效性与优越性。在高法向应力条件下，接缝界面的破坏模式主要为剪断破坏，粗糙度对剪胀效应的影响被弱化；在低法向应力条件下，接缝界面的破坏模式主要为剪胀破坏。建立的新界面峰值剪切强度模型可较准确地预测防渗墙槽段接缝界面剪切力学特性，并合理考虑接缝界面不同的破坏模式，为防渗墙的安全评估提供了理论支撑。 |
| 英文摘要: |
| 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 containing joints were extracted for laboratory direct shear tests. Combined with high-precision 3D laser scanning technology，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. |
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