自平衡测试技术及桩端后压浆工艺在大直径超长桩的应用 English Version
Application of self-balanced testing and post grouting to large diameter and super-long piles
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摘要: 桩端后压浆对桩承载特性的作用:①消除工艺因素的影响,恢复土层原有的承载能力;②提高桩的承载力。为提高苏通大桥桩基础的承载力,将不同后压浆工艺应用于苏通大桥大直径超长桩中。采用自平衡试桩法对压浆效果进行了静载荷试验。基于试桩的测试结果,对桩压浆前后的承载力、位移变化情况以及承载特性作了分析。该研究成果直接应用于苏通大桥主桥桩基础设计中,取得了显著的经济效益。Abstract: The effects of grouting were as follows: to eliminate the influence of technological defects; to recover the bearing capacities of strata; and to improve the bearing capacities of piles. To improve the bearing capacity of piles under Sutong Yangtze River Bridge, different post grouting techniques were adopted to large diameter and super-long piles. Self-balanced testing was used to determine bearing capacity and to verify grouting effect. Based on the test results, bearing capacity, settlement and bearing characteristic before and after grouting were analyzed. The research results were applied in the design of piles of Sutong Yangtze River Bridge to solve the difficulty and to achieve the remarkable economic benefit.
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