正反向排水板真空预压法在地基处理工程中的应用  

Application of vacuum preloading method of prefabricated vertical drain and reverse prefabricated vertical drain in foundation treatment engineering

作　　者：武亚军[1] 陈浩[1] VU Quoc Vuong 陈国公 陈先叠 WU Yajun;CHEN Hao;VU Quoc Vuong;CHEN Guogong;CHEN Xiandie(Department of Civil Engineering,Shanghai University,Shanghai 200444,China;Faculty of Civil Engineering,Thuy Loi University,Hanoi City 100000,VietNam;ZhejiangLonggang Xinggang Investment and Construction Co.,Ltd.,Wenzhou 325802,China)

机构地区：[1]上海大学力学与工程科学学院,上海200444 [2]越南水利大学土木工程学院,越南河内100000 [3]浙江省龙港市兴港投资建设有限公司,浙江温州325802

出　　处：《水运工程》2024年第7期217-225,238,共10页Port & Waterway Engineering

基　　金：国家自然科学基金项目(42272320、42207168)。

摘　　要：目前真空预压法加固软土地基中排水板负压源通常位于顶部,由于真空度沿竖向的衰减,普通真空预压对深层土体的加固效果较差。为此提出了正反向排水板相结合的排水方式,正向排水板的负压源在排水板顶部,反向排水板的负压源在排水板的底部。将正反向排水板结合真空预压应用于温州某地基处理工程中,对地表沉降、真空度、孔隙水压力等指标的监测结果显示,平均固结度达到93.1%。相同工况下正反向排水板结合真空预压数值模拟得到的地表沉降大于正向排水板结合真空预压得到的地表沉降,增长率达到12.9%;相同工况下正反向排水板结合真空预压数值模拟得到的孔隙水压力在3~10 m范围内的消散情况明显优于正向排水板结合真空预压,地基加固效果更好。正反向排水板结合真空预压方法值得在工程中进一步推广应用。At present,the negative pressure source of the prefabricated vertical drains(PVD)in the soft soil foundation reinforced by vacuum precompression method is usually located at the top,due to the attenuation of the vacuum along the vertical direction,the effect of ordinary vacuum preloading on deep soil is relatively poor.Therefore,a drainage method combining the PVD and the reverse prefabricated vertical drains(RPVD)is proposed,the negative pressure source of the PVD is at the top of the drainage plate,and the negative pressure source of the RPVD is at the bottom of the drainage plate.The PVD and RPVD combined with vacuum precompression is applied to a foundation treatment project in Wenzhou,and the monitoring results of surface settlement,vacuum degree and pore water pressure show that the average consolidation degree reaches 93.1%.Under the same working conditions,the surface settlement value obtained by the PVD and RPVD combined with vacuum precompression numerical simulation is larger than the value of surface settlement obtained by PVD combined with vacuum precompression,and the growth rate reaches 12.9%.Under the same working conditions,the dissipation of pore water pressure in the range of 3-10 m obtained by the PVD and RPVD combined with vacuum precompression numerical simulation is significantly better than that of the PVD combined with vacuum precompression,and the foundation reinforcement effect is better.PVD and RPVD combined with vacuum precompression method is worthy of further popularization and application in engineering.

关 键 词：基础工程 正反向排水板 真空预压 地表沉降 数值模拟 固结度 

分 类 号：U655.5[交通运输工程—港口、海岸及近海工程]