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地铁勘察中水平基床系数是一个非常重要的参数,而扁铲侧胀试验(DMT)是一种现场横向原位测试,存在着快速、准确、土体扰动少等特点,有着现有试验手段无法达到的优势,它可以获取四个基本参数(侧胀模量ED、材料指数ID、水平压力指数KD及孔隙水压力UD)和进行水平基床系数的估算。本文对杭州地铁工程勘察中的28个扁铲测试孔的回归统计分析,初步总结出划分地层界线的土类指数ID的范围值,建立了铁路规范中水平基床系数估算公式的折减修正系数的相关公式,在地铁勘察中作了有益的尝试。
The horizontal bed coefficient in subway survey is a very important parameter. However, flat dilatometer test (DMT) is a kind of on-site horizontal in-situ test, which has the characteristics of rapid, accurate and less disturbed soil. It has the existing experimental methods Unpredictable advantages include four basic parameters (Swell Modulus ED, Material Index ID, Horizontal Pressure Index KD, and Pore Water Pressure UD) and an estimate of horizontal bed coefficient. This paper regresses the statistical analysis of 28 flat shovel test holes in the Hangzhou Metro survey, initially summarizes the range value of the soil index ID which divides the boundary of the strata, and establishes the reduced correction coefficient of the horizontal bed coefficient estimation formula in the railway code The relevant formula in the subway survey made a useful attempt.