黏性土中静压桩沉桩过程现场试验及桩土界面桩侧土压力分析  

Analysis of Earth Pressure at Interface of Piles-Soil in Pile Sinking Under Static Pressure in Cohesive Soil

作　　者：王永洪[1] 桑松魁 张明义[1] 李长河 韩勃 袁炳祥[6] 项俊宁 王振杰 刘慧宁 Wang Yonghong;Sang Songkui;Zhang Mingyi;Li Changhe;Han Bo;Yuan Bingxiang;Xiang Junning;Wang Zhenjie;Liu Huining(School of Civil Engineering,Qingdao University of Technology,Qingdao 266033,Shandong,China;Zhongji Jiurui Geotechnical Engineering Co.,Ltd.,Qingdao 266061,Shandong,China;Qingdao Green Technology Geotechnical Engineering Co.,Ltd.,Qingdao 266033,Shandong,China;School of Mechanical and Automotive Engineering,Qingdao University of Technology,Qingdao 266520,Shandong,China;School of Civil Engineering,Shandong University,Jinan 250061,China;School of Civil and Transportation Engineering,Guangdong University of Technology,Guangzhou 510006,China;Shandong Hi-Speed Engineering Construction Group Co.,Ltd.,Jinan 250014,China)

机构地区：[1]青岛理工大学土木工程学院,山东青岛266033 [2]中基久瑞岩土工程有限公司,山东青岛266061 [3]青岛绿色理工岩土工程有限公司,山东青岛266033 [4]青岛理工大学机械与汽车工程学院,山东青岛266520 [5]山东大学土建与水利学院,济南250061 [6]广东工业大学土木与交通工程学院,广州510006 [7]山东高速工程建设集团有限公司,济南250014

出　　处：《吉林大学学报（地球科学版）》2021年第5期1535-1543,共9页Journal of Jilin University：Earth Science Edition

基　　金：国家自然科学基金项目(51708312);山东省重点研发计划项目(2018GSF117010)。

摘　　要：为了揭示黏性土中静压桩贯入过程中桩土界面桩侧土压力的受力特性,依托山东东营某桩工程开展了现场足尺试验,得到了静压桩沉桩过程中桩土界面桩侧土压力随贯入深度的变化规律,分析了贯入过程中不同土层桩侧土压力的分布特性,明确了桩侧土压力在沉桩过程中存在明显的退化效应,探讨了桩土界面桩侧土压力与桩侧上覆土体竖向土压力的比值关系。结果表明:桩土界面桩侧土压力与土层性质密切相关;随着传感器贯入深度的逐渐增加,桩侧土压力逐渐增大,并且增大幅度随土层的不同而不同;在同一贯入深度处,桩土界面桩侧土压力存在明显的退化现象,粉土中的退化幅度明显小于粉质黏土中的退化幅度;同一土层中桩土界面桩侧土压力与桩侧上覆土体竖向土压力的比值为常数,并且粉土中的比值明显大于粉质黏土中的比值。In order to reveal the changes of the earth pressure at the pile-soil interface during the penetration of the jacked pile in the cohesive soils, based on a pile project in Dongying, Shandong Province, a full-scale field test was carried out. The variation law of the earth pressure on the side of the pile with the penetration depth during the process of jacked pile sinking was obtained. The distribution characteristics of the earth pressure on the side of piles in different soil layers were analyzed. It is clear that the earth pressure on the pile sides has obvious degradation effect in the process of pile sinking. The relationship between the soil pressure at the pile sides and the overburden soil weight at the pile-soil interface was discussed. The results show that the earth pressure at the pile-soil interface is closely related to the soil properties. As the penetration depth of the sensor increases, the soil pressure on the side of the pile increases gradually, and the increase rate varies with different soil layers. At the same depth, the earth pressure at the pile-soil interface degrades obviously, and the degradation rate in silt soil is less than that in silty clay. In the same soil layer, the ratio of the earth pressure on the pile-soil interface to the soil weight on the pile-soil interface is constant, and the ratio in silt soil is obviously greater than that in silty clay.

关 键 词：静压桩 桩侧土压力 退化效应 现场试验 

分 类 号：TU473.11[建筑科学—结构工程]