复杂边界条件下深基坑分区组合支护设计与应用
首发时间:2018-12-03
摘要:石家庄市某商业中心深基坑工程周边环境复杂,研究确定了有放坡土钉墙支护、桩锚支护和桩锚-内支撑支护相结合的分区组合支护方案,对支护结构的强度、基坑位移等进行了设计计算。基坑监测数据结果表明,该方案合理可行,实施效果良好。当基坑周围环境相差较大时,可采用分区组合支护方案,发挥不同支护方式的优点,在保证基坑支护质量的同时,降低工程造价。桩锚支护结构和土钉支护结构中,锚杆根部和土钉根部附近地表容易出现较大的裂缝,在基坑工程设计、施工时应予重视。基坑水平位移随着离坑角距离的增加而显著增大,对于异形基坑,中部凸出的阳角部位的水平位移增大尤其明显,基坑设计和开挖过程中应加强这些部位的支护。
关键词: 深基坑 分区组合支护 土钉支护 桩锚支护 现场监测
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Design and Application of Divisional Combined Retaining for Deep Foundation Pit under Complex Boundary Conditions
Abstract:The surrounding environment of the deep foundation pit project of a commercial center in Shijiazhuang is complex, a divisional combined retaining scheme with soil nailing wall, pile-anchor support and pile-anchor-internal reinforced concrete support was presented, and the strength of support structure and the displacement of foundation pit were calculated. The monitoring data of foundation pit show that the scheme is reasonable and feasible, and the implementation result is successful. When the environment around the foundation pit is quite different, divisional combined retaining scheme can be adopted to take advantages of different supporting methods, so as to ensure the quality of foundation pit support and reduce the cost of constrDesign and Application of Divisional Combined Retaining for Deep Foundation Pituction. In pile-anchor supporting structure and soil nailing supporting structure, large cracks appear on the ground above the end of bolts and soil nails, much attention should be paid in the design and construction of foundation pit. The horizontal displacement of foundation pit increases obviously with the increase of the distance from the pit angle. For special-shaped foundation pit, the horizontal displacement of the bulgy corner in the middle of the pit increases remarkably, and support of these parts should be strengthened in the design and excavation of foundation pit.
Keywords: deep foundation pit divisional combined retaining soil-nailed wall support, pile-anchor support, site monitoring
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复杂边界条件下深基坑分区组合支护设计与应用
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