岩土力学2024，Vol.45Issue(5)：1321-1333,13.DOI:10.16285/j.rsm.2023.0671
不均匀卵石持力层桩端后注浆效果试验研究
Experimental study of post-grouting effect of piles installed in inhomogeneous pebble bearing layer
摘要
Abstract
The southeast coast of China,particularly in Wenzhou,is characterized by soil strata comprising a thick layer of soft soil overlying an uneven pebble layer.In this region,post-grouting technique is frequently employed to enhance the bearing performance of bored piles.To assess the effectiveness of post-grouted piles in such strata,several model tests were carried out to analyze the impact of varying grouting volume on the bearing capacity of the piles.Subsequently,scanning electron microscope(SEM)tests were used to explore the distribution ranges of the grout in the pebble layer.Furthermore,the relationship between the diffusion range and the bearing capacity of piles was investigated.The results show that the grout effectively permeates the pebble around piles tip,and increasing the grouting volume expands the permeated range.The most significant improvement in pile bearing capacity occurs when the range is 3-4 times the pile diameter.An optimal grout volume level is identified,with the normalized value of the grout volume being approximately 2.8 for the model piles.The bearing capacity of the pile is no longer significantly increased once the normalized value of the grout volume is exceeded.Notably,the optimal grout volume closely aligns with the predicted result of Liu Jinli's formula[1].The utilization of scanning electron microscopy proved instrumental in evaluating the effect of post-grouting in a soil layer characterized by a thick layer of soft soil overlying an inhomogeneous pebble layer.关键词
卵石持力层/桩端后注浆/注浆量/静载试验/电镜扫描/细观评价Key words
pebble bearing layer/post-grouting at pile tip/grouting volume/static load test/scanning electron microscope(SEM)/microscopic evaluation分类
建筑与水利引用本文复制引用
王军,金天,秦伟,张峰,蔡瑛..不均匀卵石持力层桩端后注浆效果试验研究[J].岩土力学,2024,45(5):1321-1333,13.基金项目
国家自然科学基金青年项目(No.52008318) （No.52008318）
温州市科技局项目(No.X2023102,No.S20210004) （No.X2023102,No.S20210004）
浙江省教育厅专培项目(No.Y202351959) （No.Y202351959）
温州大学科研创新项目(JWXC2023229).This work was supported by the National Natural Science Foundation of China(52008318),the Project of Wenzhou Science and Technology Bureau(X2023102,S20210004),the Specialized Training Program for Education Department of Zhejiang Province(Y202351959)and the Innovation Funds of Wenzhou University(JWXC2023229). （JWXC2023229）
