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随着城市开发建设的快速推进和高层建筑的修建,市政工程大规模的建设,地下停车场以及地下商场等地下空间的开发和利用,基坑边坡工程越来越多,受周边环境的影响,施工难度越来越大,施工中必须确保基坑边坡的稳定以及周边建(构)筑物的安全。通过玉屏县宏发铭都基坑支护工程实例,介绍钻孔咬合桩为主的基坑支护设计方案,解决了卵石层透水性强、自稳性差、内摩擦角大以及粘聚力小容易失稳的基坑支护问题。该方案采用钻孔咬合桩+预应力锚索支护方案,有效解决了以上问题。通过实际监测表明:基坑位移及沉降均满足基坑支护规范几设计要求。该方案成功应用为卵石层基坑工程提供了一定的借鉴方法。
With the rapid development of urban development and construction of high-rise buildings, large-scale municipal construction projects, underground parking and underground shopping malls and other underground space development and utilization of foundation pit slope more and more projects, affected by the surrounding environment , The construction more and more difficult, the construction must ensure the stability of the pit slope and the surrounding building (structure) safety. Through the example of the supporting project of Hongdu Mingdu foundation pit in Yuping County, the design scheme of foundation pit supporting with bored piles is introduced to solve the problem that the pebble layer has strong water permeability, poor self-stability, large internal friction angle and small cohesion Susceptible foundation pit support problems. The program uses bored pile + prestressed anchor cable support program, effectively solve the above problems. The actual monitoring shows that the displacement and settlement of foundation pit meet the requirements of several specifications of foundation pit supporting. The successful application of this scheme has provided a certain reference method for pebble foundation pit project.