高速公路中炭质泥岩路堤研究

发布时间：2018-01-08 05:30

本文关键词：高速公路中炭质泥岩路堤研究　出处：《长安大学》2015年硕士论文　论文类型：学位论文

【摘要】：炭质泥岩具有风化快、强度低、遇水崩解的工程特性,如果处理不当很容易造成路基病害。本文依托六寨-河池高速公路,针对炭质泥岩是否能用于高速公路做了一系列研究。在已有的软岩填料的基础上,围绕炭质泥岩的路用性能、水理特性、路堤沉降变形以及施工质量控制等问题,通过室内室外试验以及有限元数值模拟等展开了工作:通过化学成分分析、物理基本性能、粒度分析、CBR试验、压缩试验、直剪、三轴剪切以及炭质泥岩崩解水理试验研究,表明若炭质泥岩趋近于完全崩解状态,其性质比较稳定,满足高速公路路堤的强度和刚度,可用于高速公路的路堤填筑。对本构模型进行分析,结合室内试验得到炭质泥岩的应力-应变关系接近Duncan-Chang模型;本文使用大型有限元软件ABAQUS的二次开发平台,针对不同压实度的条件下建立有限元模型,得到水平以及竖向位移变形特点,为沉降特征进一步做准备;同时通过对现场的沉降值进行采集并与数值模拟的数值进行拟合分析,筛选出双曲线法最符合沉降的趋势,使用该法根据现场实测数据对炭质页岩路堤的工后沉降进行预测研究。参考现有的软岩施工工艺以及压实标准,结合使用现有的施工机械,提出了适用于30-40cm松铺厚度的方案,首先使用20t的羊角碾压路机对铺筑的炭质泥岩路堤进行碾压两遍,随后采用20t的光轮压路机碾压4遍,在填筑到94区顶面时,对压实好的路堤采用冲击式压路机冲压20遍,对于高度较大的路堤,每隔一定的高度(2-4m)也可以多次采用冲击式压路机进行补压。
[Abstract]:Carbonaceous mudstone has weathered fast, low strength and engineering properties of water disintegrable, if handled properly it is easy to cause subgrade diseases. Based on the six village highway in Hechi, aiming at whether carbargilite can do a series of studies for the highway. On the base of soft rock filling on existing around the carbonaceous mudstone road performance, water physical properties, the problem of embankment settlement deformation and construction quality control, through indoor and outdoor test and finite element numerical simulation work was carried out by chemical analysis, particle size analysis of the basic physical properties, CBR, test, compression test, direct shear, three axle shear and Carbon Mudstone disintegration of water test shows that, if Carbon Mudstone tends to completely disintegrate, the nature is stable and meet the highway embankment strength and stiffness, can be used for highway embankment. The constitutive model of node Combined tests find carbargilite stress-strain relationship close to Duncan-Chang model; this paper uses finite element software ABAQUS two development platform, according to the different degree of compaction under the condition of finite element model is established, and the level of vertical displacement deformation characteristics, settlement characteristics for further preparation; at the same time by collecting on the scene the sedimentation value and fitting analysis and numerical simulation, screened hyperbolic method accords with the trend of settlement, settlement prediction of the use of the method according to the measured data of the carbonaceous shale embankment. The existing soft rock construction process and compaction standard, combined with the use of existing construction machinery, is presented. 30-40cm loose thickness scheme, claw roller first use 20t for paving carbonaceous mudstone embankment compacted for two times, followed by light wheel road 20t When the machine is rolled for 4 times, when it is filled to the top 94 area, the compacted embankment will be punched 20 times by impact roller. For a large embankment, the impact compactor can also be used repeatedly for a certain height (2-4m).

【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U416.1

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