咬合桩支护结构的抗弯承载特性研究  

Study on the bending performance of secant pile retaining wall

作　　者：廖少明[1] 周学领[1] 宋博 李文林[1] 范垚垚[1] 

机构地区：[1]同济大学地下建筑与工程系 [2]上海申通集团有限公司,上海200031

出　　处：《岩土工程学报》2008年第1期72-78,共7页Chinese Journal of Geotechnical Engineering

摘　　要：钻孔咬合桩作为一种较为新颖的基坑挡土墙形式,其抗弯承载力特性对于基坑挡墙的设计来说至关重要。在室内试验的基础上,根据缓凝时间要求,确定C30超缓凝混凝土的配比;通过相似模型试验对咬合桩支护结构在考虑素桩作用下的抗弯承载力特性进行研究,揭示了咬合桩从弹性到塑性破坏不同阶段荤素桩力学行为,提出了其抗弯承载力计算方法.进一步结合上海地铁某咬合桩试验段,通过实测钢筋应力和测斜曲线推算了不同工况下咬合桩抗弯承载力的发挥情况.实测情况表明,考虑素桩作用的抗弯承载力设计是合理的。The bending performance of the secant piles is crucial to the design of foundation pits. The mixture ratio of ultra-retardation concrete was determined in accordance with the requirements of strength and coagulation time by laboratory tests. Through model tests, the bending performance of the secant piles with intercrossing of reinforced concrete pile （RCP） and plain concrete pile （PCP） was studied and the mechanical behavior and the effect of PCP on the bending capacity of secant piles at different stages from elastic to plastic state had been achieved. Furthermore, the bending performance of secant piles in different cases had also been evaluated through field measurement of the stress of steel and displacement of the pile. It was shown by in-situ tests that it was reasonable to take the effect of plain concrete piles into consideration in design.

关 键 词：咬合桩 荤素桩 模型试验 抗弯承载力 

分 类 号：TU375.1[建筑科学—结构工程]