桩土复合路基静载试验的改进方法  

Improved Method of Static Load Test of Pile-soil Composite Roadbed

作　　者：宋浩翰 洪宝宁[1,2,3] 单浩 姜昌武[1,2,3] 刘鑫 SONG Hao-han;HONG Bao-ning;SHAN Hao;JIANG Chang-wu;LIU Xin(Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China;Jiangsu Research Center for Geotechnical Engineering Technology, Hohai University, Nanjing 210098, China;Geotechnical Research Institute, Hohai University, Nanjing 210098, China;Tunnel and Underground Engineering Institute, Hohai University, Nanjing 210098, China)

机构地区：[1]河海大学岩土力学与堤坝工程教育部重点实验室,南京210098 [2]江苏省岩土工程技术工程研究中心,河海大学,南京210098 [3]河海大学岩土工程科学研究所,南京210098 [4]河海大学隧道与地下工程研究所,南京210098

出　　处：《科学技术与工程》2020年第32期13402-13409,共8页Science Technology and Engineering

摘　　要：为了克服现有复合路基静载试验的不足,通过引进能模拟实际垫层作用的弹性垫层,提出一种改进的桩土复合路基静载试验方法。首先,通过数值模拟对不同工况下的静载试验进行分析,论证引入弹性垫层的合理性;然后,对比不同工况下的桩土应力比以确定弹性垫层参数;最后,通过现场水泥粉煤灰碎石(cement fly-ash gravel,CFG)桩复合路基试验,分析改进后静载试验在沉降及桩土应力比的变化规律。试验表明,弹性垫层具有明显的应力调节作用,更能体现实际工程垫层的作用,为桩土复合路基的质量检测提供了一种新方法。In order to overcome the deficiency of existing static load test of composite roadbed,an improved static load test method of pile-soil composite roadbed was proposed by introducing elastic cushion which could simulate actual cushion action.Firstly,the rationality of introducing elastic cushion was proved by analyzing static load test under different working conditions through numerical simulation.Then,the pile-soil stress ratio under different working conditions was compared to determine the elastic cushion parameters.Finally,through the field cement fly-ash gravel(CFG)pile composite roadbed test,the change rule of settlement and pile-soil stress ratio in the improved static load test were analyzed.The tests show that the elastic cushion has an obvious stress regulation effect,which can better reflect the effect of actual engineering cushion,and provide a new method for quality inspection of composite roadbed.

关 键 词：复合路基 静载试验 弹性垫层 现场试验 

分 类 号：TU473.16[建筑科学—结构工程]