大面积真空预压加固法处理软土地基技术研究

真空预压是软土地基加固处理的一种方法,结合京沪高速铁路上海虹桥枢纽工程的深厚软土地基加固处理与沉降控制资料,介绍采用真空预压加固的虹桥动车运用所软基的一个试验段施打排水板引起的沉降、地基表面沉降以及孔隙水压力的现场观测和试验,并对观测结果进行了分析。最后,结合现场测试数据,采用数值计算方法对地基加固措施的受力特性和沉降变形规律进行分析,得到的沉降量与实测沉降推算结果较接近。

Technological Research on Treating Soft Foundation with Large Area Vacuum Preloading Method

Vacuum preloading is a method to treat soft foundation.With reference to the data of soft soil foundation reinforcement and settlement control from Shanghai Hongqiao hub project on Beijing-Shanghai high-speed railway,this paper introduces the test section of Hongqiao soft foundation where settlement is caused by placing draining board in the process of vacuum preloading reinforcement,and on-site observation and tests of ground surface settlement and pore water pressure are conducted And the results of observation are analyzed.Finally,the mechanical characteristics and the rule of the settlement of foundation reinforcing measures are analyzed with numerical calculation method based on field test data,and the calculated settlement is close to the measured result.