| 邹德高,屈永倩,孔宪京,刘京茂,冉从勇,张丹.深厚覆盖层上土石坝防渗墙损伤开裂精细化分析及防渗功能评价[J].水利学报,2024,55(2):147-157 |
| 深厚覆盖层上土石坝防渗墙损伤开裂精细化分析及防渗功能评价 |
| Refined failure analysis and functional evaluation of cutoff walls of rockfill dams on deep overburden |
| 投稿时间：2023-07-17 |
| DOI：10.13243/j.cnki.slxb.20230436 |
| 中文关键词: 深厚覆盖层 防渗墙 损伤开裂分析 防渗功能 性态评价 |
| 英文关键词: deep overburden cutoff wall failure analysis anti-seepage function functional evaluation |
| 基金项目:国家自然科学基金项目（52192674，52109151）；云南省重大科技专项计划项目（202102AF080002）；中央高校基本科研业务费项目（DUT23RC（3）001） |
| 作者 | 单位 | E-mail | | 邹德高 | 大连理工大学 海岸与近海工程国家重点实验室, 辽宁 大连 116024
大连理工大学 水利工程学院, 辽宁 大连 116024 | | | 屈永倩 | 大连理工大学 海岸与近海工程国家重点实验室, 辽宁 大连 116024
大连理工大学 水利工程学院, 辽宁 大连 116024 | quyongqian@dlut.edu.cn | | 孔宪京 | 大连理工大学 海岸与近海工程国家重点实验室, 辽宁 大连 116024
大连理工大学 水利工程学院, 辽宁 大连 116024 | | | 刘京茂 | 大连理工大学 海岸与近海工程国家重点实验室, 辽宁 大连 116024
大连理工大学 水利工程学院, 辽宁 大连 116024 | | | 冉从勇 | 中国电建集团成都勘测设计研究院有限公司, 四川 成都 610072 | | | 张丹 | 中国电建集团成都勘测设计研究院有限公司, 四川 成都 610072 | |
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| 中文摘要: |
| 混凝土防渗墙是覆盖层上土石坝坝基的关键防渗结构，由于防渗墙与覆盖层的刚度和尺度差异巨大，通常的数值分析方法难以保证精度，且现有基于强度的安全评价方法，无法适应防渗墙作为防渗结构而非承载结构的功能评价要求。本文提出了比例边界元-有限元耦合跨尺度离散、塑性损伤模型和内聚力模型分离描述压损伤和受拉开裂、破损后防渗功能目标评价的精细化分析方法，实现了深厚覆盖层上土石坝防渗墙的性态演化评价。研究结果表明：超深覆盖层上悬挂式防渗墙在两岸底部因近似垂直于岸坡的高压应力发生压损伤，类“外伸梁”的面内弯曲变形使靠近防渗墙两岸的顶部和底部区域产生坝轴向高拉应力导致槽段间出现竖向裂缝；在防渗墙两岸的上游侧局部设置辅助防渗措施，可有效降低防渗墙破损后的渗流量。本文方法揭示了混凝土防渗墙的损伤开裂模式，定位了防渗墙薄弱区域，评价了防渗墙损伤开裂对防渗功能的影响，量化防渗措施效果，实现了防渗墙从传统承载能力评价到功能性态评价的跨越，可为深厚覆盖层上土石坝防渗墙的安全评价和设计优化提供理论和技术支持。 |
| 英文摘要: |
| The concrete cutoff wall is the key anti-seepage structure for the foundation of rockfill dams on the overburden.Due to the significant difference in stiffness and scale between the cutoff wall and the overburden, conventional numerical analysis methods struggle to ensure accuracy.Moreover, current strength-based safety evaluation methods cannot adapt to the functional evaluation requirements of the cutoff wall as an impermeable structure rather than a load-bearing structure.In this paper, a refined analysis method is proposed to describe the evaluation of anti-seepage performance targets after compression damage and tensile cracking and breakage by coupling the proportional boundary element-finite element cross-scale discretization, the plastic damage model, and the cohesion model separately, and to realize the evaluation of the performance evolution of the cutoff wall of the rockfill dams on the deep overburden.The results indicate that the hanging-type cutoff walls on the ultra-deep overburden undergo pressure damage at the bottom on both sides due to high compressive stresses approximately perpendicular to the bank slope.The in-plane bending deformation, resembling an "outstretched beam", induces high tensile stresses in the top and bottom regions near the banks of the cutoff wall, resulting in vertical cracks between adjacent sections.The auxiliary cutoff walls on the upstream side is an effective measure in reducing the seepage flow after damage to the cutoff wall.The proposed method reveals the damage and cracking patterns of concrete cutoff walls, locates weak areas of the cutoff wall, evaluates the effect of damage-induced cracking on anti-seepage performance, and quantifies the effectiveness of measures.This method bridges the gap from the traditional load-bearing capacity evaluation to the functional performance evaluation of cutoff walls, providing theoretical and technical support for the safety evaluation and design optimization of cutoff walls of rockfill dams on deep overburden. |
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