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| 防渗墙槽段接缝界面剪切力学特性研究 |
| Shear mechanical characterization of joint interface of trench sections of cut-off wall |
| 投稿时间：2025-01-14 修订日期：2025-09-22 |
| DOI： |
| 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 trench section joint shear strength three-dimensional roughness shear strength model |
| 基金项目:国家重点研发计划课题 |
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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极易发生剪切变形。为探究槽段接缝的剪切力学特性，采用实际的防渗墙施工设备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接缝界面的剪切强度和破坏形态均有影响；新的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。新模型可较准确地预测防渗墙槽段接缝界面剪切力学特性，并合理考虑了界面不同的破坏模式。 |
| 英文摘要: |
| The trench section joint of cut-off wall is susceptible to shear deformation under a high hydraulic gradient and dynamic hydraulic forces during operation of the dam. In order to investigate the shear mechanical properties of the joint interface, three experimental cut-off walls were constructed on site downstream of the Shiziping Dam. The original specimens of the trench section joint were cut for indoor direct shear tests. Combined with three-dimensional laser scanning technology, a three-dimensional roughness evaluation method with anisotropy is proposed. Then, a new interface peak strength model is established. The results show that normal stress, roughness and concrete strength have an effect on the shear strength and damage patterns of the interface. The new interfacial peak strength model has obvious validity and superiority. Under high normal stress conditions, the damage pattern of the interface is mainly shear damage, and the influence of roughness on the shear expansion effect is weakened. Under low normal stress conditions, the damage pattern of the interface is mainly dilation failure. The new model can more accurately predict the shear mechanical properties of the trench section joint of cut-off wall and reasonably consider the different damage patterns of the interface. |
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