腾格里沙漠风积沙路基压实技术研究

发布时间：2018-09-09 15:09

【摘要】：经过几十年的发展,我国在沙漠筑路方面有了一定的发展,但随着沙漠公路逐渐增多,新的问题也逐渐显现出来,使得已有的理论有时不能很好的解决新问题。本文在调查和收集国内外沙漠公路资料的基础上,依托通额公路,对以风积沙为填料的腾格里沙漠地区路基压实技术进行研究。主要内容如下:(1)通过颗分试验对依托工程沿线的风积沙进行了工程划分;通过振动试验对风积沙的振动压实特性进行了研究,并分析了风积沙的干压实和湿压实特性;分析了风积沙路基在不同虚铺厚度和不同碾压方式下路基的压实效果;对不同标段风积沙路基进行静压、弱振、强振、水坠法压实试验,系统分析了风积沙路基在不同施工工艺下的压实效果;通过灌砂法和环刀法对风积沙进行了干密度检测试验,分析了这两种方法在检测风积沙路基压实度上的差异性;提出了轻型动力触探法,可快速检测风积沙路基压实度。(2)建立了在不同层厚、不同坡比和不同碾压遍数工况下风积沙路基模型,分析了各种工况下的路基压实效果,并确定了最佳路基压实方案。分析了厚层风积沙路基的变形特征,研究了其在荷载作用下的二次压实效应,并总结了其变形规律。(3)对风积沙陡坡路基填挖交界衔接处的不均匀沉降进行了数值分析,探讨了不同土工格室加筋位置、层数、模量和高度等因素对不均匀沉降的影响效果,并最终确定了最佳的加筋方式。
[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.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U416.1

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