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吕   凯

 

( 上海市地矿建设有限责任公司 , 上海   200040)

摘  要 :  为验证高强度预制倾斜桩支护体系在上海软土地区浅基坑工程中的应用效果 , 基于上海某开挖深度 5. 8 m 基坑为背景 , 通过系统监测围护顶竖向位移 、水平位移 、深层水平位移 、支撑轴力 、立柱竖向位移及周边地表沉降等多维监测数据 , 对比分析验证其变形控制效果 。结果显示 : 角部混凝土+倾斜桩复合区围护顶竖向位移在最大值显著低于单一倾斜桩区 ;  围护顶水平位移终值介于 3. 4 ~ 8. 7 mm 之间远低于设计报警值 ; 深层水平位移呈“ 弓形 ”分布 , 南侧施工重载通道区值最大值 , 达 39. 6 mm; 倾斜桩支撑轴力与抗压承载力比值均符合设计要求 ; 重型车辆通道侧地表沉降最大 , 达 29. 79 mm 。结论表明 , 倾斜桩支护可有效控制变形 , 结合角部混凝土支撑形成三角受力体系可进一步提升整体支撑刚度 ;  同时 , 动荷载加剧局部变形 , 但体系整体安全可靠。研究成果可为相关工程提供参考。

关键词 : 倾斜桩 ; 软土地区 ; 变形控制

中图分类号 : TU43          文献标志码 :  A           文章编号 :  1005- 8249  (2026)  03-0121-06

DOI :10. 19860/j. cnki. issn1005- 8249. 2026. 03. 020

 

LV Kai

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

Abstract :  To  evaluate  the  application  effectiveness  of  high - strength  prefabricated  inclined  piles  support  systems in shallow foundation pit engineering  within  Shanghai ' s  soft  soil regions , a case study  was conducted using a 5. 8 m excavation depth foundation pit  in  Shanghai.   Through systematic  monitoring of  multidimensional parameters including vertical displacement of retaining walls , horizontal displacement , deep horizontal displacement , support axial forces , column vertical displacement , and surrounding ground settlement , the deformation control performance was analyzed.   Results demonstrated : Vertical  displacement at the corner concrete-inclined pile composite zone was significantly lower than that in single inclined pile zones ; Final horizontal displacement  values  of retaining  walls  ranged  between  3. 4 - 8. 7  mm ,  substantially  below   design  alarm  thresholds ;  Deep horizontal displacement exhibited a "  bow-shaped "  distribution with  maximum values recorded in the heavy-load construction passage area on the southern side (39. 6 mm) ; Both support axial force ratios and compressive bearing capacity ratios of inclined piles met design specifications ; Maximum surface settlement occurred along heavy vehicle access routes (29. 79 mm) .   The study concludes that  inclined  pile  support  systems effectively control deformation ,  while integrating corner concrete supports to  form triangular stress systems enhances overall structural stiffness.   Although dynamic loads exacerbate localized deformation , the entire system remains structurally safe and reliable.   The outcomes of this study may serve as a reference for relevant engining application.

Key words :  inclined piles ; soft soil areas ;  deformation control