温州市域铁路深厚软土层扁铲侧胀试验应用研究  

Application of Flat Dilatometer Tests in Deep Soft Soils of Wenzhou Suburban Railway Projects

作　　者：涂启柱[1] TU Qizhu(China Railway Siyuan Survey and Design Group Co.Ltd.,Wuhan 430063)

机构地区：[1]中铁第四勘察设计院集团有限公司,武汉430063

出　　处：《土工基础》2023年第1期142-146,160,共6页Soil Engineering and Foundation

基　　金：中国铁路总公司科技研究开发计划科研专项课题(J2015C008)。

摘　　要：扁铲侧胀试验可以获取岩土体多个重要参数,针对温州市域铁路深厚软土层,开展扁铲侧胀试验应用研究。试验研究表明:扁铲侧胀试验获取的水平固结系数约是孔压静探消散试验的0.74倍,获取的不排水抗剪强度约是十字板剪切试验的1.04倍,获取的静止侧压力系数、水平基床系数与室内试验、规范经验值较为接近,因此扁铲侧胀试验可为地下工程设计与施工提供较准确的岩土参数。扁铲侧胀试验结果表明,温州市域铁路软土层具有固结与渗透特性弱、不排水抗剪强度低、静止侧压力系数大、水平基床系数小等特点,地下工程施工安全风险高。The flat dilatometer test is an advanced in-situ test method, which can obtain a variety of important geotechnical parameters. This paper presents the application of flat dilatometer tests in deep soft soil layers in Whenzhou Suburban Railway Project to provide design and construction support of the underground engineering. The results indicate that: the horizontal consolidation coefficient obtained from the flat dilatometer test is about 0.74 times that of from the pore pressure dissipation test, and the undrained shear strength obtained from the flat dilatometer test is about 1.04 times that of the field vane shear test, and the static lateral earth pressure coefficient and the subgrade horizontal coefficient obtained from the flat dilatometer test are close to that obtained from laboratory test and the empirical value recommended in the design code. Therefore, the flat dilatometer test can provide accurate geotechnical parameters for the design and construction of underground engineering. The results of flat dilatometer test show that the soft soil layer in the Wenzhou Suburban Railway Project has the characteristics of weak consolidation and permeability, low undrained shear strength, large coefficient of static lateral earth pressure and small coefficient of horizontal subgrade bed. During underground engineering construction, the safety risk is high of underground engineering construction.

关 键 词：温州市域铁路 地下工程 扁铲侧胀试验 水平固结系数 不排水抗剪强度 静止侧压力系数 水平基床系数 

分 类 号：TU413[建筑科学—岩土工程]