Abstract：Research purposes：Loess exists widely in the area along the Zhengzhou-Xi'an Passenger Dedicated Line, with length of collapsible loess section accounting for 65% of the total railway length. The collapsible loess covers all types of loess in China, with degrees from Grade Ⅰ to Grade Ⅳ. Construction of high-speed railway in such a area with complex geological condition faced the much uncertainty and challenges Therefore, at the early stage of construction, the soaking tests were done in the typical test pits according to the different topographical features of the loess plateau, the second-order terraces of Yi River and Luo River, the loess tableland, the second-order terraces of the Yellow River and the Wei River, so as to seek the influence range of collapsible loess under condition of soaking in large floor for the purpose of providing the tested data for foundation treatment and design of water control and drainage.
Research conclusions：The tests and researches showed the saturation-line rates of 8 soaking test fields under fully soaking were between 1.3~6.0. The horizontal distance between the area where the collapsible deformation happened and the side of soaking test pit increased gradually to 6-15 m from east to west out of the test pit of 15 mm. The horizontal distance between the area where the water proof measures were taken and the shoulder was 0.2~0.5 times of the loess layers' thickness. The design depths were 0.32H -1.60a, 1.53H-3.40a and 0.88H-1.75a separately for the areas of DK 233-DK 250, DK 250 -DK 321 and DK 321-DK 356.
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2010, Vol. 27 
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