黏性土中钢管桩振动起拔土体损失与应对措施  

Soil Loss and Mitigation Strategies in Clay During Steel Pipe Pile Vibration Extraction

作　　者：赵颖 赵鹤 林军 ZHAO Ying;ZHAO He;LIN Jun(Jiangsu Bureau of Geology,Nanjing 210018,China;Jiangsu Huadong Geological Construction Group Co.Ltd.,Nanjing 210007,China;Guangxi University of Science and Technology,Liuzhou 545006,Guangxi China;Jiangsu Open University,Nanjing 210036,China)

机构地区：[1]江苏省地质局,南京210018 [2]江苏华东地质建设集团有限公司,南京210007 [3]广西科技大学,广西柳州545006 [4]江苏开放大学,南京210036

出　　处：《河南科学》2024年第3期347-354,共8页Henan Science

基　　金：国家自然科学基金项目(51908250)。

摘　　要：钢管桩作为一种快捷、绿色和可回收的支护结构被广泛关注,但是,钢管桩在振动回收过程中土体损失引起的环境效应是关注的焦点.提出了振动拔桩过程简化模型,依据振动极限状态下“桩+土柱+锤”的动力平衡公式和拔桩条件,以黏性土层厚度和侧阻力标准值为判别指标,建立了黏性土场地拔桩土柱预测模型.根据苏州、淮安和盐城黏性土地层项目的原位拔桩试验,验证了预测模型和计算方法的合理性.基于试验结果,指出在黏性土场地中,土体损失引起的环境效应预测模型的准确性取决于土层侧阻力、上覆土层和土体剪切变形,并提出了消除环境效应的措施,确保周边环境的安全.Steel pipe piles are considered eco-friendly support structures.However,the environmental impact resulting from soil loss during the vibration recovery of steel pipe piles is the main focus.A simplified model for the vibration extraction process has been suggested.The prediction model for the soil column carried by the extraction pile is established using the dynamic equilibrium formula of“pile+soil column+hammer”under the vibration limit state and extraction conditions.This model includes the thickness of the clay layer and the standard side friction resistance value as discriminatory indicators.The validity of the prediction model and calculation method is confirmed through in-situ extraction tests conducted in clay strata projects in Suzhou,Huai’an,and Yancheng.The test results indicate that factors influencing the accuracy of the environmental impact prediction model for the soil column in clay consist of side friction resistance,overlying soil layers,and clay layer shear deformation.Proposed strategies to mitigate the environmental impact of soil loss are suggested to safeguard the surrounding environment.

关 键 词：钢管桩 土柱 黏性土 环境效应 

分 类 号：U445.556[建筑科学—桥梁与隧道工程]