【作者】 唐晓武； 林维康； 邹渊； 王天琦； 赵文芳；

【Author】 TANG Xiao-wu;LIN Wei-kang;ZOU Yuan;WANG Tian-qi;ZHAO Wen-fang;Research Center of Coastal and Urban Geotechnical Engineering,Zhejiang University;Zhejiang Urban Underground space Development Engineering Technology Research Center,Zhejiang University;

【机构】 浙江大学滨海和城市岩土工程研究中心； 浙江省城市地下空间开发工程技术研究中心；

【摘要】 "碳达峰,碳中和"已成为我国国策,绿色发展理念亦是岩土工程发展的机遇所在。我国的铁路、公路、港口和机场等重要基础设施,80%以上分布在软弱土地区,随着"一带一路"倡议、海洋资源开发战略的实施,重大基础设施建设中会面临越来越多的软弱土复杂技术难题。本文首次提出了一种真空预排水管桩,旨在同时实现地基处理与桩基础的作用。真空预排水管桩打桩能耗小,碳排放更少,且不使用塑料排水板,进一步减少了塑料降解产生的二氧化碳。本文首先介绍其结构与工作原理,后通室内试验分析其排水固结特性与承载力特性。结果表明:真空预排水管桩的单桩抗压承载力是普通管桩的3倍以上,单桩抗拔承载力为普通管桩的6倍,反滤膜和真空固结是提升排水管桩承载力的重要条件;当真空时间为300h时,真空预排水管桩距桩侧3d范围内的桩周土固结度可达到77.2%,基本达到了初步固结;真空预排水管桩使桩周土更为紧密,起到扩展桩径的效果,提高了真空预排水管桩的承载性能。更多还原

【Abstract】 "Carbon peak,carbon neutral "has become China’s national policy,green development concept is also the opportunity for the development of geotechnical engineering.More than 80% of the important infrastructure in China,such as railway,highway,port and airport,is distributed in soft soil area.In this paper,a kind of vacuum pre drainage pipe pile is proposed for the first time in order to realize the function of foundation treatment and pile foundation at the same time.The results show that:the compressive bearing capacity of single pile of vacuum pre drainage pipe pile is more than 3 times of that of ordinary pipe pile,and the uplift bearing capacity of single pile is 6 times of that of ordinary pipe pile;When the vacuum time is 300 h,the consolidation degree of the soil around the vacuum pre drainage pipe pile can reach 77.2%within 3 days from the pile side;The vacuum pre drainage pipe pile can make the soil around the pile more compact,expand the pile diameter,and improve the bearing capacity of the vacuum pre drainage pipe pile.更多还原