高层建筑刚性桩复合地基现场试验探究.pdfVIP

第七届全国土木工程研究生学术论坛 东南大学 2009 高层建筑刚性桩复合地基现场试验研究 陶景晖1,2 1 1 2 ，梁书亭 ，龚维明 ，吴春良 (1. 210096 2. 210029) 东南大学土木工程学院，南京 ； 江苏省建筑设计研究院有限公司，南京 摘 要： 为研究高层建筑刚性桩复合地基的工作机理和荷载传递特性，在南京某高层建筑刚性桩复合地基工程现场 设置了大型试验区,进行了多项复合地基原位载荷试验与应力测试。根据试验数据，对复合地基承载机理、应力分布和变 化规律进行了分析与研究。对四桩复合载荷试验进行了数值模拟并深入分析，分析结果与实测数据吻合较好。研究结果表 明：桩体对桩间土的加固效果随荷载水平增加而提高，本次试验桩间土承载力提高系数为1.16，发挥系数为0.88～1.00； 桩土应力比随荷载增加而增大，最终趋于稳定，本次试验测得稳定值在15～17；加载过程中，刚性桩的承载力发挥滞后于 桩间土，桩侧阻力的发挥早于桩端。根据研究结果，提出承载力取值标准的建议，可供同类工程设计和研究参考。 关键词：刚性桩复合地基；载荷试验；数值模拟；桩土应力比；承载力 Field study of composite foundation with rigid pile for high-rise building Tao Jing-hui 1,2，Liang Shu-ting 1，Gong Wei-ming 1，Wu Chun-liang 2 (1.School of Civil Engineering, SouthEast University, Nanjing 210096, China； 2.Jiangsu Provincial Architectural Design and Research Institute Co., Nanjing 210029, China) Abstract: To study the working mechanism and load-transfering behavior of the composite foundation with rigid piles in high-rise building, a large field test area was set at the site of a high-rise building in Nanjing. A series of static loading tests and stress tests were carried out. Based on the test results, the load bearing mechanism of composite foundation and the distribution and variation of stress were analyzed. A numerical model of the four-pile composite foundation was generated and the load test was simulated. The simulation results are in good agreement with the test results. Analytical results show that the strengthening effect on the soil among the piles increases with the loading values. For this test, the strengthening coefficient