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       吕   凯

         （上海市地矿建设有限责任公司 ，上海 200040)

摘   要 ：在软土地区深基坑工程中 ，地层高压缩性 、低渗透性及环境敏感性对支护技术提出更高要求。以 上海某调蓄池项目为背景 ，针对开挖深度达 16. 6 m（ 局部 18. 1  m ) ,  引入自动伺服系统。通过构建多维度监测 网络 ，系统追踪地下连续墙侧向位移 、支撑轴力动态变化 、周边地表沉降及坑外水土响应特征 ，结合自动伺服 系统的实时反馈与动态调整机制 ，验证其主动控制变形能力。结果表明： 自动伺服系统通过压力阈值设定与多级支撑协同 ，显著降低地下连续墙最大侧移至 0. 1% H  ( H 为开挖深度），较传统实测规范均值缩减 31 . 3% ;  系 统的自适应调节有效平衡了软土流变效应与开挖卸荷应力释放间的矛盾 ，其  “预测 －响应 －补偿 ” 闭环逻辑为 复杂地层基坑工程提供新思路。

关键词： 自动伺服系统 ；深基坑 ；变形控制

中图分类号：TU43           文献标志码：A     

       

文章编号： 1005- 8249  (2025)  03- 0084- 06

DOI:10. 19860/j.cnki.issn1005 - 8249.2025 .03 .016

LV Kai

(Shanghai Geological and Mineral Construction Co., Ltd., Shanghai 200040，China)

Abstract：In deep foundation pit engineering in soft soil areas, the high compressibility, low permeability and environmental sensitivity of the strata pose higher requirements for support technology.Traditional deep excavation projects commonly adopt a support system combining diaphragm walls with concrete struts, while systematic research on the support structure integrating diaphragm walls with composite servo steel struts remains relatively scarce. Taking a Shanghai storage tank project as the background, for an excavation depth reaching 16.6 m (locally 18.1 m), the support system adopts an automatic servo steel support system.Monitoring data is used to track the lateral displacement of diaphragm walls, the dynamic changes of the support axial force, the surrounding ground surface settlement and the response characteristics of the water and soil outside the pit are systematically tracked. Combined with the real-time feedback and dynamic adjustment mechanism of the servo system, its active control deformation ability is verified. The research found that the servo system, through the pressure threshold setting and the coordination of multi-level supports, significantly reduced the maximum lateral displacement of the underground continuous wall to 0.1%H (H is the excavation depth), which is 31.3% lower than the average value of the traditional measured norms. Theoretical analysis shows that the self-adaptive regulation of the system effectively balances the contradiction between the rheological effect of soft soil and the stress release of excavation unloading, and its "prediction-response-compensation" closed-loop logic provides a new idea for complex stratum foundation pit engineering.

Key words:automatic servo system; deep excavation engineering; deformation control

作者简介： 吕    凯  (1992—) ,   男 ，硕士 ，工程师 ，研究方向 ：岩土工程。

收稿日期：2025 - 04 - 19