隧道弃渣填筑高速公路路基施工与检测技术研究
[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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