双钢轮振动压路机面层压实工艺研究

发布时间：2018-09-05 20:00

【摘要】：面层是公路的重要组成部分，双钢轮振动压路机是面层压实的主要设备，其压实质量与压实效率关系到公路的使用质量与建设成本。目前国产双钢轮振动压路机结构、性能参数与国际水平保持同步，但施工工艺研究几乎处于空白。因此论文对双钢轮振动压路机面层的压实工艺进行了实际工地调研统计、理论与试验研究，为双钢轮振动压路机压实工艺的研究提供了参考。首先，对压实工艺中的压实遍数、振动压实模式、振动参数组合进行了理论分析。指出通过能量等效方法可预估压实遍数；前进时开启振动比前进后退均开启振动时的压实效果好。提出了有效接触宽度及重叠度两个概念，指出有效接触宽度及重叠度可确定振动频率与压实速度的关系，并得出了压实速度、振动频率、有效接触宽度及重叠度之间的关系式。其次，选取某国产压路机与AC13型沥青混凝土为研究对象，对有效接触宽度进行试验研究，并建立了其数学模型。通过对不同松铺厚度下的材料沉降量观测，发现在前两遍压实时，沉降量最大，第四遍以后，沉降量变化不明显，并得出了沉降量随压实遍数变化的拟合方程。通过分析钢轮与材料在压实过程中的变化，得出了有效接触宽度的数学模型，并根据该数序模型计算出了每一遍压实时的有效接触宽度。发现：有效接触宽度随振幅及松铺厚度增大而增大；在压实的初期，有效接触宽度最大，，随着压实的进行，有效接触宽度逐渐减小，直到稳定不变。最后，以某高速公路施工标段为依托，对某国产双钢轮振动压路机的压实工艺进行了系统研究。通过对材料进行击实试验，计算室内试验的击实能量和压路机施加给材料的振动能量，确定了压实遍数；通过对比试验确定了振动压实方向及振动参数组合；通过研究不同重叠度下压实度变异系数的变化情况，确定了每遍压实的合理速度范围。通过有效接触宽度确定振动频率和压实速度关系的方法，为压实工艺的研究提供了新思路。
[Abstract]:The surface layer is an important part of highway, and the double-wheel vibratory roller is the main equipment for surface compaction. Its compaction quality and compaction efficiency are related to the use quality and construction cost of highway. In this paper, the surface compaction technology of double-wheel vibratory roller is investigated and analyzed on the actual site, and the theoretical and experimental research is carried out, which provides a reference for the study of the surface compaction technology of double-wheel vibratory roller.
Firstly, the theoretical analysis of compaction times, vibratory compaction mode and vibration parameter combination in compaction technology is carried out. It is pointed out that the energy equivalent method can be used to predict the compaction times, and the effect of opening vibration in advance is better than that of opening vibration in both forward and backward. The relationship between vibration frequency and compaction velocity can be determined by width and overlap degree, and the relationships among compaction velocity, vibration frequency, effective contact width and overlap degree are obtained.
Secondly, the effective contact width between a domestic road roller and AC13 asphalt concrete is tested and studied, and its mathematical model is established. Through the observation of material settlement under different thickness of loose pavement, it is found that the first two times of compaction are real-time, the settlement is the largest, and after the fourth time, the change of settlement is not obvious, and the settlement is obtained. By analyzing the change of the effective contact width between the steel wheel and the material in the process of compaction, the mathematical model of the effective contact width is obtained, and the real-time effective contact width is calculated according to the mathematical model. During the compaction period, the effective contact width decreases gradually until it is stable.
Finally, the compaction technology of a domestic twin-wheel vibratory roller is systematically studied on the basis of the construction tender section of a highway. The compaction energy of indoor test and the vibratory energy of the roller are calculated through the compaction test, and the compaction times are determined. By studying the variation coefficient of compaction degree under different overlap degree, the reasonable speed range of each compaction is determined.
The method of determining the relationship between vibration frequency and compaction velocity by effective contact width provides a new idea for the study of compaction technology.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U415.521

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