振动沉拔钢护筒对周围软土层的挤压效应  

Extruding Effect of the Vibration Driving of Steel Tubes on Soft Clay around Piles

作　　者：聂庆科[1] 胡建敏[1] 王伟[2] 

机构地区：[1]河北建设勘察研究院有限公司,石家庄050031 [2]北京交通大学土木建筑工程学院,北京100044

出　　处：《工程勘察》2008年第3期5-9,共5页Geotechnical Investigation & Surveying

摘　　要：通过现场测试,研究振动沉拔钢护筒施工过程对周围软土层的挤压效应,分析了孔压产生和消散规律以及挤压应力在空间上的分布特征。测试结果表明,随着钢护筒沉入深度的增加,沿土层深度的挤压应力峰值呈现逐渐增大并向深层传递的趋势,而孔压峰值也呈现向深层逐步推进的演变过程;在每次沉入或上拔过程中,孔压总是先表现为明显的上升过程,然后又开始下降;沉拔结束后经过较短的时间,挤压应力就减小至非常接近初始应力状态的值,而孔压的消散过程也非常快。Based on field test results the extruding effect in a deep soft clay foundation due to the vibration driving of Steel tubes is studied and the generation and dissipation of pore pressure and the squeeze stresses are analyzed. Test results show that the peak values of the extruding stresses and pore pressure continually increase with the increasing of the driving depth of steel tube, and the locations of the peak values move in the direction of depth. In the processes of driving or drawing, the pore pressure obviously increases at the first stage and then decreases. During the short time after the end of driving or drawing, the extruding stresses decrease nearly to the initial values of horizontal stress, and the pore pressure is also dissipated in a short time.

关 键 词：软土地基 振动作用 现场测试 挤压效应 

分 类 号：TU435[建筑科学—岩土工程]