论文部分内容阅读
介绍了护坡桩+预应力锚杆支护体系及三轴水泥土搅拌桩在山西太原汾河阶地敏感地层中的应用。通过提高单根锚杆极限承载力减少锚杆道数,进而减小锚杆成孔造成的地层损失;采用液压双动力双套管施工工艺,有效保护孔壁,降低孔壁受冲刷的程度进而减小地层附加沉降;同时采取多重堵漏措施,确保高水位环境下帷幕体系的有效性;通过监测及时指导施工,动态调整施工参数,使敏感建筑物变形始终位于安全变形范围之内。结果证明此种基坑支护技术在灵敏地层中应用的可行性和有效性。
The application of slope protection pile + prestressed bolt support system and triaxial cement-soil mixing pile in the sensitive formation of Caohe terrace in Taiyuan, Shanxi Province was introduced. Through the improvement of the ultimate bearing capacity of a single bolt, the number of anchor rods can be reduced, thereby reducing the loss of the stratum caused by the formation of holes in the anchor rod; and the hydraulic double power double casing construction technology can be used to effectively protect the wall of the hole and reduce the degree of erosion of the hole wall. Reducing the additional settlement of the stratum; adopting multiple measures for plugging at the same time to ensure the effectiveness of the curtain system under high water level environment; timely monitoring and guiding the construction and dynamically adjusting the construction parameters, so that the deformation of sensitive buildings is always within the scope of safe deformation. The results demonstrate the feasibility and effectiveness of this foundation pit support technology in sensitive formations.