锥形-有孔柱形组合管桩群桩沉桩效应试验研究  

Experimental Research on the Sinking Effect of Group of Taper-cylinder with Holes Combined Pipe-piles

作　　者：曾璐 雷金波[1] 王泽南 张汉军 ZENG Lu;LEI Jin-bo;WANG Ze-nan;ZHANG Han-jun(School of Civil and Architectural Engineering,Nanchang Hangkong University,Nanchang 330063,China)

机构地区：[1]南昌航空大学土木建筑学院,南昌330063

出　　处：《南昌航空大学学报（自然科学版）》2023年第4期66-72,共7页Journal of Nanchang Hangkong University(Natural Sciences)

基　　金：国家自然科学基金(52268060);南昌航空大学研究生创新专项(YC2021-111)。

摘　　要：为研究锥形-有孔柱形组合管桩群桩沉桩挤土效应,对锥形-有孔柱形组合管桩群桩沉桩引起的超孔隙水压力时空消散规律进行了研究。基于室内模型试验,对锥形-有孔柱形组合管桩群桩沉桩引起的超孔隙水压力进行监测和分析。结果表明,通过增加桩身开孔数和减小锥度,可降低锥形-有孔柱形组合管桩群桩沉桩引起的超孔隙水压力峰值,降低的幅度在13.96%~17.94%;超孔隙水压力的消散速率随着深度的增大而增大,随着径向距离的增大而减小;与其他布孔方式相比,星状布孔方式的桩身,其群桩沉桩引起的超孔隙水压力峰值更小,消散速率更快。总之,锥形-有孔柱形组合管桩能够提高桩基础的施工质量和稳定性,研究成果能够为锥形-有孔柱形组合管桩的工程应用提供一定的参考。In order to study the soil squeezing effect of Taper-cylinder with holes combined pipe-piles,a group pile test was conducted on Taper-cylinder with holes combined pipe-piles to obtain the spatial and temporal dissipation law of super-pore water pressure caused by sinking piles.Based on the indoor model test,the excess pore water pressure caused by the Taper-cylinder with holes combined pipe-piles group pile sinking was detected and analyzed.The results showed that by increasing the number of holes in the pile body and reducing the taper,the peak of excess pore water pressure caused by the sinking of Taper-cylinder with holes combined pipe-piles could be reduced by 13.96%~17.94%.The dissipation speed of excess pore water pressure increased with the increase of depth and decreased with the increase of radial distances.Otherwise,compared with other hole layout methods,the pipe-piles with star-shaped hole layout method exhibited smaller peak value of excess pore water pressure caused by pile group sinking and faster dissipation speed.In conclusion,the Taper-cylinder with holes combined pipe-piles would be able to improve the construction quality and stability of pile foundation,and the research results could provide some reference for the engineering application of Taper-cylinder with holes combined pipe-piles.

关 键 词：锥形-有孔柱形组合管桩 模型试验 超孔隙水压力 沉桩效应 

分 类 号：TU473.1[建筑科学—结构工程]