| “地下复合支撑”变形分析与优化设计 |
| Received:October 21, 2023 Revised:January 02, 2024 点此下载全文 |
| 引用本文：潘春宇.“地下复合支撑”变形分析与优化设计[J].Geology and Exploration,2024,60(2):356-366 |
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| 中文摘要:“地下复合支撑”是通过在基坑坑底布置加固水泥土将坑底工程桩与基坑支护桩墙相连形成复合受力体。基坑开挖时,复合受力体共同受力抵抗变形,有效控制围护结构变形并抑制坑底土体隆起。本文提出“地下复合支撑”概念及其设计理论,分析坑底加固面积置换率、固化剂掺量、加固深度等关键设计参数对基坑变形的影响,为“地下复合支撑”投入工程实践提供设计依据和理论参考。基于工程实例,针对原支护体系给出地下复合支撑的优化设计方案,验证新型复合支撑的可行性,体现其对基坑围护结构水平位移和坑底隆起变形控制的优势。同时,按照优化设计方案可以减少基坑内支撑的道数,具有安全性和经济性。 |
| 中文关键词:深基坑 坑底加固 基坑支护 数值模拟 优化设计 |
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| Deformation analysis and optimization design of underground composite supports |
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| Abstract:"Underground composite support" is a composite load-bearing body formed by connecting the engineering piles at the bottom of the foundation pit with the foundation pit support pile wall by arranging reinforced cement soil at the bottom of the foundation pit. During excavation of the foundation pit, the composite load-bearing body is jointly subjected to force to resist deformation, effectively controlling the deformation of the retaining structure and suppressing the uplift of the soil at the bottom of the pit. This article proposes the concept of "underground composite support" and its design theory, analyzes the influence of key design parameters such as replacement rate of pit bottom reinforcement area, dosage of curing agent, and reinforcement depth on the deformation of foundation pits, and provides design basis and theoretical reference for the application of "underground composite support" in engineering practice. Based on engineering examples, an optimized design scheme for underground composite support was proposed for the original support system, and the feasibility of the new composite support was verified,witch has demonstrated its advantages in controlling the horizontal displacement and uplift deformation of the foundation pit enclosure structure. Meanwhile, according to the optimized design scheme, the number of supports in the foundation pit can be reduced, which is safe and economical. |
| keywords:deep foundation pit, pit bottom reinforcement, excavation support, numerical simulation, optimal design |
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