Reaction coefficient of subgrade on Xi?an loess and correlation analysis of methods of measurement
YU Yongtang1，2，TANG Hao2
(1. College of Civil Engineering，Xi?an University of Architecture and Technology，Xi?an，Shaanxi 710055，China；2. Shaanxi Key Laboratory of Engineering Behavior and Foundation Treatment for Special Soil，China Jikan Research Institute of Engineering Investigations and Design Co.，Ltd.，Xi?an，Shaanxi 710043，China)
Abstract：The ranges of coefficient of subgrade reaction in different soil layers and the relationships of coefficient of subgrade reaction with depth are analysed based on the measurement with plate load test in Xi?an Metro. The measured coefficients of subgrade reaction from the plate load test，the pressure-meter test，the standard penetration test，and the laboratory consolidation test are compared and analyzed with the method of regression analysis. The results show that the coefficients of subgrade reaction of the new loess layer，the old loess layer and the paleosol layer increase with depth，but the variation regularity is not obvious in the loess-like soil layer. The horizontal coefficient of reaction is mostly smaller than the vertical coefficient of subgrade reaction . In general，the ratio exhibits a normal distribution. The values of of nearly 81% of the total test data are distributed in the range 0.5–1.0. The measured coefficients of subgrade reaction vary linearly with the pressure-meter modulus and the SPT counts. The measured coefficients of subgrade reaction have approximately the quadratic relationships with the modulus of compressibility and the coefficient of compressibility.
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2017, Vol. 36 
