岩土力学2023，Vol.44Issue(11)：3091-3098,8.DOI:10.16285/j.rsm.2023.0818
静钻根植桩扩底桩端极限承载性能的试验研究
Field study on the ultimate bearing capacity of enlarged grout base of pre-bored grouted planted pile
摘要
Abstract
Pre-bored grouted planted pile is a new type of eco-friendly pile toundation.The combination of the lower section of PHC nodular pile and the pile base expansion greatly improves the vertical bearing capacity of single pile.A lot of application practices have been achieved in Jiangsu,Zhejiang and Shanghai regions,but limited to the current research status,the bearing capacity of enlarged grout base is not clear.Based on the in-situ self-balanced loading test,the ultimate compressive bearing capacity of the enlarged grout base of the pre-bored grouted planted pile is investigated.The research results reveal that the measured ultimate bearing capacity of the enlarged grout base of the pile is 40％higher than that calculated by the specifications.The back analysis of the test results shows that the ultimate end resistance reduction coefficient of Shanghai ⑦ layer of silt is 0.72-0.81,which is significantly higher than the recommended value of 0.50-0.55 in the specifications.The bearing capacity of the enlarged grout base of the pile is mainly controlled by the end bearing capacity,and the required displacement value for its full bearing capacity is about 0.03 times the pile diameters.The enlarged grout base of the pile accounts for 64％to 67％of the bearing capacity of pre-bored grouted planted pile,and the structural integrity of the enlarged grout base plays a key role in the working performance of the pre-bored grouted planted pile.关键词
静钻根植桩/扩大头/自平衡试验/承载性能/桩端阻力Key words
pre-bored grouted planted pile/enlarged grout base/self-balanced loading test/bearing capacity/end resistance of pile分类
土木建筑引用本文复制引用
王卫东,王萌,吴江斌..静钻根植桩扩底桩端极限承载性能的试验研究[J].岩土力学,2023,44(11):3091-3098,8.基金项目
上海市科技创新行动计划(No.22dz1202900) （No.22dz1202900）
上海市青年科技启明星计划(No.22QB1400500).This work was supported by the Shanghai Science and Technology Development Funds(22dz1202900)and Shanghai Rising-Star Program(22QB1400500). （No.22QB1400500）
