Experimental Study On Subgrade Filling Characteristics Of Saline Soil For Chaerhan-Geermu Expressway

Based on the saline soil which is from A contract section of Chaerhan-Geermu expressway, the author primarily used the experiments in room and the theoretical analysis, the road-related performance is studied systemically. The main research contents and conclusions as follows:(1)Through the tests in the laboratory, the paper approaches the physical and chemical properties and the microcosmic features of saline soil with different salt percentage, the basic research parameters are obtained.(2)Based on the heavy compaction and the vibration table test, the compacting and the vibratory compacting properties and the compaction mechanism are studied. The rules that the vibratory parameters influence the vibratory compacting of saline soil are analyzed and the optimum combination of the parameters is summed up. In the vibrating compaction test, the combination of low frequency and high swing is recommended if we use the same acceleration.The effect of the vibratory compaction is superior to the heavy compaction. The vibration compaction method is used to determine the biggest dry density, which is suggested to evaluate the compaction degree standard of saline soil in highway subgrade.(3)The feasibility of saline soil in highway subgrade filling is evaluated systemically by the strength of saline soil, including the influence factors of CBR and resilient modulus are analyzed and the effects of CBR and resilient modulus by the different molding methods are compared.(4)Through the laboratory tests and the onsite work examination, the feasibility of nature rock-salt in subgrade filling is analyzed, this paper proposes the way of onsite work of subgrade construction of rock salt, the method of examination and the measures of preventing disease.