Based on the Richards equation for water movement in unsaturated porous media,a simulation model of the humidity field model of high speed railway subgrade was established through the numerical software to study the influence of the number of layers and the outstretched length of water-conducting geotextiles on the humidity field of high speed railway subgrade.An engineering example verification was carried out relying on the Tieli-Yichun High Speed Railway Project.The results show that after the laying of water-conducting geotextiles,the volume moisture content of the soil decreases by 7.7%to 8.2%,indicating that the water-conducting geotextiles played a significant role in water isolation.Compared with a single layer of water-conducting geotextiles,the laying of double layers of water-conducting geotextiles reduced the volume moisture content at the top of the subgrade by 3.7%and at the bottom by 6.0%.The outstretched length of water-conducting geotextiles had a significant promoting effect on the humidity control of the subgrade,and the optimal extension length is 1.34 m.After the laying of geotextiles,the increase in the internal water content of the subgrade was significantly reduced,which shows that the water-conducting geotextiles played a certain drainage function in the on-site application and effectively inhibited the increase in the internal humidity of the subgrade.
water-conducting geotextilelayout characteristics of geotextilevolume moisture contentfield test
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