Study on the Effect of Dry and Wet Cycles on the Mechanical and Deformation Characteristics of Mechanism Sand-amended Expansive Soil
Different dosage(0%,10%,20%,30%)of mechanism sand is added into the expansive soil for phys-ical improvement,and the above soil samples are subjected to 0-5 times of wet and dry cycle tests to analyze the crack development law of the soil samples,direct shear tests and shrinkage and expansion tests are conducted on the soil samples after 1,3 and 5 dry and wet cycles to explore the strength attenuation and shrinkage and expan-sion characteristics of the soil samples after the dry and wet cycles.The results show that the mechanism sand can effectively inhibit the crack development of expansive soil,and the best inhibition effect is achieved when the dos-age of the mechanism sand is 10%,which can better inhibit the concentrated development of cracks in the im-proved soil,and the shear strength of the improved soil under the dosage of 10%has the smallest attenuation,and the contraction and expansion characteristics also have the best performance.This test verifies that the mechanism of sand can delay the development of cracks and shear strength attenuation of expansive soil in the process of dry and wet cycle,and can improve the contraction and expansion deformation characteristics of soil samples,the im-provement effect is affected by the dosage of mechanism of sand,taking various factors into consideration,the dos-age of mechanism of sand should be controlled within 10%.
mechanized sand-amended soilswet and dry cyclesstrength decayshrinkage deformationex-pansion deformation
NETL
NSTL
万方数据
