隧道弃渣填筑高速公路路基施工与检测技术研究

发布时间：2018-10-15 10:22

【摘要】：随着西部大开发,山区的高速公路建设发展迅速,建设中桥隧所占的比例日益增加,其中所产生的隧道弃渣也越来越多,大多数处理的方法就是简单的堆砌。这种粗放型的做法,将本可以利用的隧道弃渣未加利用而直接抛弃,填筑路基时又缺乏筑路材料,反而需在当地大量开采筑路材料,这不仅破坏自然环境和生态平衡,而且浪费社会资源,增加了建设费用。若利用隧道弃渣,并经破碎等工艺处理后作路基填料,可实现材料的就地取材,也可提高路基的强度及稳定性。隧道弃渣作路基填料时,检测其压实度是否符合要求就显得尤为重要。本文首先分析了隧道弃渣的工程特性;其次分析了在压实过程中隧道弃渣的破碎性及其影响因素;同时进一步阐明了影响隧道弃渣压实度的因素,分析出传统压实度检测方法的一些不足。本文通过借鉴国内外对弃渣填料压实度检测研究成果的基础上,建立了“振动机—路基填料”模型并提出压实度连续检测系统,该方法有利于压实质量的实时控制。本文对压实度连续检测系统进行了理论分析研究及现场试验,证明了该方法的可靠性、准确性。主要得出以下几个结论:(1)在我国高速公路建设中,规范中压实度的检测方法只适用于填土路基,而对于填石路基的检测有很大缺陷,在本文研究试行一种新的检测方法,即压实度连续检测技术。该检测方法能够方便利用快速检测出路基的压实质量且实用性强。(2)提出由加速度传感器、数据采集仪、计算机及数据分析系统组成的压实度连续检测系统进行的压实度连续检测技术。通过采集加速度的振动信号并对其进行分析处理,其结果能够反映出路基整体的压实程度。在本文中也证明了该方法准确可行。(3)通过对采集压路机加速度激振信号分析证明:路基压实度是与路基填料的刚度成正相关、与其阻尼成负相关的;而振动压路机垂直的振动加速度与路基填料的刚度也是成正相关、与其阻尼也是成负相关的。通过本文理论分析的结果基础上,建立起“振动压路机—路基”模型仿真模拟,结果表明路基填料压实度的确与振动压路机垂直的振动加速度成正相关关系。(4)因隧道弃渣填料属于散体材料,具有破碎性质,我们以第一种级配进行三种压实工艺的对比,确定工艺Ⅰ的施工方法对路基压实的效果最为合理。(5)提出用振动压路机的振动加速度有效值表示压实填料的压实度。本文得到三种弃渣填料在级配不同、最佳含水量不同的条件下,压实度与振动轮加速度有效值之间的回归公式和相关系数。
[Abstract]:With the development of the western region, the highway construction in the mountainous area is developing rapidly, the proportion of bridge and tunnel is increasing day by day, and more tunnel waste is produced, most of the disposal methods are simply stacking. In this extensive way, the waste residue of the tunnel that could have been used is discarded directly, and the roadbed is filled with no road construction materials. Instead, it requires extensive mining of road building materials in the local areas, which not only destroys the natural environment and ecological balance, but also causes a great deal of damage to the natural environment and the ecological balance. And waste social resources, increased the cost of construction. If the waste residue is used as subgrade filler after crushing, the material can be obtained locally, and the strength and stability of roadbed can also be improved. It is very important to test whether the compaction degree meets the requirement when the slag is used as the subgrade filler. In this paper, the engineering characteristics of tunnel slag are analyzed at first, secondly, the fragmentation of tunnel slag and its influencing factors are analyzed, and the factors that influence the compaction degree of tunnel slag are expounded. Some shortcomings of traditional compaction measurement methods are analyzed. Based on the domestic and foreign research results on the compaction degree of waste slag filler, the model of "vibration moving-subgrade packing" is established and a continuous compaction measurement system is put forward. This method is beneficial to the real-time control of compaction quality. In this paper, the theoretical analysis and field test of the continuous compaction measurement system are carried out, and the reliability and accuracy of the method are proved. The main conclusions are as follows: (1) in the highway construction of our country, the compaction degree detection method in the code is only applicable to the subgrade filled with earth, but there are great defects in the detection of the subgrade filled with stone. In this paper, a new testing method is studied and tried. That is compactness continuous testing technology. This method can be used to quickly detect the compaction quality of roadbed and has strong practicability. (2) the acceleration sensor and data acquisition instrument are proposed. The continuous compactness testing technology of the compactness continuous testing system composed of computer and data analysis system. By collecting the vibration signal of acceleration and analyzing it, the result can reflect the compaction degree of subgrade as a whole. The method is also proved to be accurate and feasible in this paper. (3) by analyzing the acceleration excitation signal of road roller, it is proved that the compaction degree of roadbed is positively correlated with the stiffness of subgrade filler and negatively correlated with its damping. The vertical vibration acceleration of the vibratory roller is also positively correlated with the stiffness of the subgrade filler and negatively correlated with its damping. Based on the results of theoretical analysis in this paper, a model of "vibratory road roller subgrade" is established. The results show that the compaction degree of subgrade filler is positively related to the vertical vibration acceleration of the vibratory roller. (4) because the waste material of the tunnel belongs to the bulk material and has the property of breaking, we use the first gradation to compare the three compaction processes. It is suggested that the effective value of vibration acceleration of vibratory roller can be used to express the compaction degree of compacted filler. In this paper, the regression formula and correlation coefficient between the compaction degree and the effective value of vibration wheel acceleration are obtained under the conditions of different gradation and different optimum moisture content.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U416.1

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