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张鑫义 , 刘峰 , 王浩辰 , 周鹏君 , 刘洋

(陕西建工第九建设集团有限公司 , 榆林   719000)

摘  要: 复杂地质条件下基坑工程的支护稳定性直接影响施工安全和周边环境保护 。以某深基坑工程为研究对象 , 通过数值模拟 , 分析了基坑的变形规律 、地质参数对支护性能的敏感性及优化设计方案在极限工况和长期使用条件下的性能表现 。结果表明 : 在静态工况下 , 基坑最大水平位移为 0. 68 cm, 沉降量为 1. 23 cm, 主要集中在基坑顶部和中部区域 ; 在暴雨和地震工况下 , 优化支护方案的最大水平位移分别为 0. 87、1. 05 cm, 均未超出设计安全范围 ; 长期性能预测显示 , 在 50 年使用寿命内 , 最大水平位移和沉降量分别增长至 1. 58、 2. 75 cm。研究可为复杂地质条件下深基坑支护体系的设计优化提供技术支持 , 并对极端工况和长期使用条件下的基坑稳定性评估具有参考意义。

关键词: 深基坑支护 ; 复杂地质条件 ; 地质参数 ; 动态稳定性 ; 长期性能预测

中图分类号: TU752      文献标志码: A      文章编号: 1005-8249 (2026) 04-0128-06

DOI:10. 19860/j. cnki. issn1005-8249. 2026. 04. 019

 

Stability Analysis and Optimization of Deep Excavation Support under Complex Geological Conditions

ZHANG Xinyi , LIU Feng, WANG Haochen, ZHOU Pengjun, LIU Yang

(Shaanxi Construction Ninth Construction Group Co. , Ltd. , Yulin 719000, China)

Abstract : The stability of excavation support under complex geological conditions directly impacts construction safety and environmental protection.  This  study investigates a deep excavation project using numerical simulations to analyze the deformation patterns, the sensitivity of geological parameters on support performance, and the effectiveness of optimized designs under extreme and long-term conditions. Results indicate that, under static conditions, the maximum horizontal displacement of the excavation is 0. 68 cm, and the settlement is 1. 23 cm, primarily concentrated at the top and middle regions. Under extreme conditions such as heavy rainfall and seismic events, the optimized support scheme limits the maximum horizontal displacement to 0. 87 cm and 1. 05 cm, respectively, within safe design thresholds. Long-term performance predictions show that over a 50-year lifespan, the maximum horizontal displacement and settlement increase to 1. 58 cm and 2. 75 cm, respectively.  This study provides theoretical guidance for optimizing deep excavation support systems under complex geological conditions and offers valuable insights for stability assessments under extreme and long-term operational conditions.

Key words: deep excavation support; complex geological conditions; geological parameters; dynamic stability; long - term performance prediction