| High-speed railway subgrade requires higher quality fillers than ordinary railways. China has a vast, complex and diverse geological condition,soil distribution characteristics are not the same, therefore, with the high-speed railway construction launched extensively throughout the country, the lack of high quality fillers will inevitably hanppen,and the unqualified fillers need to be improved for using, so studying on improving unqualified fillers for high-speed railway using is of great significance. This paper studies on physical improvement of C group fine sand, which is not qualified for the constructions of high-speed railway subgrade and embankment. Results of improved filler field filling experiment show that the improvement achieved the desired effect. The major work and research contents are as following:1. According to particle analysis test results, the type and group of the raw filler are studied to determine whether it is qualified for the constructions of high-speed railway subgrade.2. Based on theorectical research results and the naure of the filler, a raw filler improving programe is proposed, in which crushed stone is used to change the particle size distribution and improve the engineering properties, the particle size distribution of the crushed stone and the reseaching programe for determination of crushed stone content are also studied.3.The changing properties of density,strength and deformation of filler according to the content change of coarse particles are studied by heavy compaction test and large-scale triaxial shear test. According on the study results, the final filler improving programe is proposed.4. The density, strength and deformation properties of improved filler are studied by carrying out field filling experiment, according to the results,improved filler construction technique is defined.5.The relaitions between K30, Ev2 and Evd are studied, based on the results of which, a high efficiency quality testing methord is studied and suggested. |
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