騰格里沙漠風積沙路基壓實技術研究
[Abstract]:After decades of development, our country has a certain development in desert road construction, but with the increasing number of desert highways, new problems are gradually emerging, which makes the existing theory sometimes can not solve the new problems very well. On the basis of investigating and collecting the data of desert highway at home and abroad, this paper studies the roadbed compaction technology in Tenggri desert area, which is filled with eolian sand. The main contents are as follows: (1) the project division of eolian sand along the supporting project is carried out through the particle sub-test, the vibration compaction characteristics of eolian sand are studied by vibration test, and the dry compaction and wet compaction characteristics of eolian sand are analyzed. The compaction effect of eolian sand roadbed under different virtual paving thickness and different compaction mode is analyzed, and the static, weak, strong and water drop compaction tests are carried out on different wind-sand subgrade. The compaction effect of eolian sand subgrade under different construction techniques is analyzed systematically, the dry density testing test of eolian sand is carried out by sand filling method and annular knife method, and the difference of these two methods in detecting the compaction degree of eolian sand subgrade is analyzed. A light dynamic penetration method is proposed to quickly detect the compaction degree of eolian sand subgrade. (2) the model of wind-sand roadbed under different layer thickness, different slope ratio and different rolling times is established, and the compaction effect of roadbed under various working conditions is analyzed. The optimal roadbed compaction scheme is determined. In this paper, the deformation characteristics of thick aeolian sand subgrade are analyzed, the secondary compaction effect under load is studied, and its deformation law is summarized. (3) the uneven settlement at the junction of fill and excavation of the roadbed on steep slope of eolian sand is analyzed numerically. The effects of different geoglass reinforcement position, layer number, modulus and height on uneven settlement were discussed, and the best reinforcement method was finally determined.
【學位授予單位】:長安大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:U416.1
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