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| Analysis and Study of Loess Engineering Characteristics of Dongzhiyuan on Xi ‘an - Yinchuan High - speed Railway |
| MENG Xiang - lian，XIA Wan - yun，ZHOU Fu - jun，JU Xiao – qiang |
| (China Railway First Survey ; Design Institute Group Co. Ltd，Xi’an，Shaanxi 710043，China) |
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Abstract Abstract:Research purposes: Xi’ an - Yinchuan high - speed railway penetrates northwards through Dongzhiyuan as The First Loess Plateau Form in the World'. The vertical section geologically indicates， the railway line pierces through twice the primary mega - thick loess layer，respectively upwards from underpart and downwards from upperpart. Therefore the loess engineering characteristics of Dongzliiyuan are key controlling factors，due to their significant impacts on the construction of Xi ’ an - Yinchuan high - speed railway in this rail segment. Through comprehensive exploration and test，as well as statistical analysis research on Dongzliiyuan segment，this paper illuminates the loess engineering characteristics of Dongzliiyuan and existing primary engineering geological problems，meanwhile puts forward reasonable measures，to provide reference for the railway construction in loess plateau area. Research conclusions:(1) The primary loess layer in Dongzhiyuan is as mega - thick as 150 ?200 m，and the surface collapsible loess is 15 ~ 23 m，with self - weight collapsibility grade as 2 to 4. ( 2 ) The physical - mechanical properties of Dongzhiyuan loess are remarkably different from south to north and in vertical direction，the loess closer to northi has lower natural water content，lower index of plasticity，higher sensitivity to collapse，higher collapsihility grade. The loess which is deeper has smaller void ratio of loess and higher natural density. ( 3 ) The geological disasters due to collapsible loess，soft plastic loess and gully of loess are main engineering geological problems existed in Dongzliiyuan segment in Xi’an -Yinchuan high - speed railway，to solve these problems，reasonable route selection and engineering treatment measures are required. (4) The research results can provide basic data for projects of Xi ‘ an - Yinchuan high - speed railway and reference for other construction in loess plateau area.
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Received: 06 September 2016
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2016, Vol. 33 
