| Wind erosion is an important factor to influence subgrade structure durability,It is dry and sparse vegetation in Northwest C hina, for example,Xinjiang, Inner Mongolia and other places,which were under the influence of wind sa nd disaster in all the year round. Through the indoor model test of the indoor Cement-Improved Loess Subgrade model and sand blasting machine involving the effects on the durability of high-speed railway subgrade in this paper, hoping to provide a reference for the construction of sand subgrade, provide the basis for the sand prevention engineering of sand subgrade, and the main conclusions are as follows:(1)Subgrade erosion is an ongoing process, and in the presence of wind-blown sand subgrade model quality gradually decreases, while at high wind speeds, the quality loss of subgrade model is faster. When the wind-sand flow rate is 25.41, 27.95, 30.28, 33.14m/s condition, and keep the sand after a continuous function 40 h, model of subgrade erosion is 3.59%, 3.18% and 7% respectively;(2)Along with the growth of wind erosion,the density of subgrade model decreases, early in the wind erosion more quickly and along with the growth of wind erosion more slowly, in addition to wind speed increases,the density o f subgrade models reduces speed. When the wind-sand flow rate is 25.41, 27.95, 30.28, 33.14m/s condition, keep the sand after a continuous function 40 h, The density of subgrade model reduce to 0.93%, 1.19%, 1.96% and 2.22% respectively;(3)The moisture content of subgrade model decreases with the increase of Aeolian erosion, while at high wind speeds, the moisture content of subgrade model decreases more faster. When the wind-sand flow rate is 25.41, 27.95, 30.28, 33.14m/s condition, keep the sand after a continuous function 40 h, the moisture content of subgrade model reduces to 8.73%, 12.19%, 18.08%, and 25.40% respectively;(4)With the increases of wind speed and time of wind erosion,unconfined compressive strength of subgrade model reduces evenly, the increases of wind speed does not expedite that the unconfined compressive strength of subgrade model decreases the speed. When the wind-sand flow rate is 25.41, 27.95, 30.28, 33.14m/s condition, keep the sand after a continuous function 40 h, unconfined compressive strength of subgrade model reduces to 5.51%, 6.3%, 7.09% and 9.06%. |
