A method for rapid measuring the compactness of soil-rock mixed subgrade based on the characteristics of granular material
HE Min1，CAO Wengui1，WANG Jiangying2，LUO Hong1
(1. Institute of Geotechnical Engineering，Hunan University，Changsha，Hunan 410082，China；
2. School of Hydraulic Engineering，Changsha University of Science and Technology，Changsha，Hunan 410004，China)
Abstract：Static penetration experiments is an effective method for rapid measuring the compactness of soil-rock mixed subgrade. However，the testing principle need to be further studied. In this paper，a method of stress analysis suitable for the granular material of soil-rock mixed subgrade is established by assuming the stresses transmitted downward with the shape of cone in the soil-rock mixture based on the stress transmission mechanism of granular material. The deformation modulus，Poisson?s ratio and porosity varied with the deformation of subgrade is determined on the basis of the porous media mechanics. A force-settlement relationship of soil-rock mixed subgrade，i.e. the P-s curve，is established based on the layer summation method. On the basis of the P-s curves obtained with the static penetration experiments，the initial porosity is obtained with the method of back analysis using an adaptive algorithm. The method for rapid measuring the compactness of soil-rock mixed subgrade is thus established. The accuracy of this method meets the engineering requirement without the complicated calibration experiments. The results of proposed method were compared with the results from tests and existing method and proved that this method was reasonable and feasible.
贺 敏1，曹文贵1，王江营2，罗 宏1. 基于散体材料性质的土石混填路基压实度快速检测方法[J]. 岩石力学与工程学报, 2017, 36(8): 2061-2069.
HE Min1，CAO Wengui1，WANG Jiangying2，LUO Hong1. A method for rapid measuring the compactness of soil-rock mixed subgrade based on the characteristics of granular material. , 2017, 36(8): 2061-2069.
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2017, Vol. 36 
