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       呂   凱

         （上海市地礦建設有限責任公司 ，上海 200040)

摘   要 ：在軟土地區深基坑工程中 ，地層高壓縮性 、低滲透性及環境敏感性對支護技術提出更高要求。以 上海某調蓄池項目為背景 ，針對開挖深度達 16. 6 m（ 局部 18. 1  m ) ,  引入自動伺服系統。通過構建多維度監測 網絡 ，系統追蹤地下連續墻側向位移 、支撐軸力動態變化 、周邊地表沉降及坑外水土響應特征 ，結合自動伺服 系統的實時反饋與動態調整機制 ，驗證其主動控制變形能力。結果表明： 自動伺服系統通過壓力閾值設定與多級支撐協同 ，顯著降低地下連續墻最大側移至 0. 1% H  ( H 為開挖深度），較傳統實測規范均值縮減 31 . 3% ;  系 統的自適應調節有效平衡了軟土流變效應與開挖卸荷應力釋放間的矛盾 ，其  “預測 －響應 －補償 ” 閉環邏輯為 復雜地層基坑工程提供新思路。

關鍵詞： 自動伺服系統 ；深基坑 ；變形控制

中圖分類號：TU43           文獻標志碼：A     

       

文章編號： 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

作者簡介： 呂    凱  (1992—) ,   男 ，碩士 ，工程師 ，研究方向 ：巖土工程。

收稿日期：2025 - 04 - 19