竖向管式格栅加筋碎石桩承载力计算方法  

Calculation method of ultimate bearing capacity of gravel pile reinforced with tube-geogrids

作　　者：高明军[1,2] 刘汉龙[1,2] 丁选明[3] 高有斌[2] 

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,江苏南京210098 [2]河海大学岩土工程科学研究所,江苏南京210098 [3]河海大学水资源高效利用与工程安全国家工程研究中心,江苏南京210098

出　　处：《解放军理工大学学报（自然科学版）》2011年第6期649-653,共5页Journal of PLA University of Science and Technology(Natural Science Edition)

基　　金：江苏省自然科学基金资助项目(BK2008040)

摘　　要：为了研究竖向管式格栅加筋碎石桩承载力的计算方法,根据其受力特性,提出可能发生破坏的3种模式:桩顶鼓出破坏、格栅套筒下方碎石桩鼓出破坏和桩端刺入破坏。基于Brauns的计算方法,给出了桩顶鼓出破坏模式的承载力计算公式,推导出了格栅套筒下方碎石桩鼓出破坏模式的单桩极限承载力的理论计算方法,给出了根据格栅抗拉强度来判断破坏模式的计算公式。对现场试验的算例进行了复核验算,将计算结果与现场静载荷实验结果进行了比较,两者吻合较好。According to mechanical characteristics,the three failure modes that may occur includes pile head bellying,bellying failure of gravel below tube-geogrids and penetration failure of pile bottom.Based on the method of Brauns,the bearing capacity formula of pile head bellying mode was put forward.In addition,the bearing capacity calculation method of the mode of bellying failure of gravel below tube-geogrids was also deduced.The calculational formula to estimate the failure mode by tensile strength of geogrids was put forward.The conclusion is proved by the results of the field experiment.

关 键 词：复合地基 承载力 土工格栅 管式格栅碎石桩 

分 类 号：TU473[建筑科学—结构工程]