路基压实度自动连续检测技术研究

发布时间：2018-02-28 23:02

本文关键词： 连续压实度检测仪振动压路机压实振动加速度 MATLAB　出处：《重庆交通大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着高速公路建设的发展,公路建设的质量问题也越来越引起人们的重视。压实程度不够是造成路面早期破坏的重要原因之一。压实作业是使路基和路面各结构材料获得足够密实度的重要环节,采用行之有效的压实度检测方法是对其实行监控的重要手段。本文在借鉴国内外对压实度检测方法研究成果的基础上,提出用随车式压实度实时连续检测系统来测量土体的压实度,其优点在于方便、快捷、准确的对压实度进行全面连续检测,以便于进行压实质量控制。通过理论分析及室内试验,设计了车载式压实度检测系统基本构成;确定了传感器、信号采集仪的选型和参数的选取,数据信号的分析和处理技术。在系统标定试验,振动台试验的基础上,完成了车载式压实度连续检测系统。通过现场试验证实了系统的准确性及可靠性。得出的主要结论如下:①振动轮激振信号的变化反映了土体的压实程度,通过对激振信号的分析处理来反映实际压实度的方法正确、可行。②通过对实际激振信号的分析表明:路基土的压实度和土的刚度正相关、和土的阻尼负相关;而振动压路机垂直振动加速度与土的刚度正相关、与土的阻尼负相关。在以上分析结果的基础上建立了“振动压路机—土体”模型及仿真分析,得到了路基土的压实度与振动压路机垂直振动加速度正相关的关系。③提出应用振动压路机垂直振动加速度传感器、数据采集仪、计算机数据处理及分析系统组成的压实度连续检测系统进行压实度连续检测技术。提出了加速度检测数据的处理及分析技术。④提出用振动压路机垂直振动加速度有效值表示压实土体压实度,加速度谐波比表示土体压实度的技术及方法。得到三种级配不同、最佳含水量不同条件下的砂类土的压实度与振动轮垂直加速度有效值之间的回归公式和相关系数,压实度与振动轮垂直加速度、压实度与加速度谐波比之间的回归公式和相关系数。⑤提出不同细粒含量(hx)砂砾土的压实度y与加速度有效值a之间的关系。
[Abstract]:With the development of highway construction, People pay more and more attention to the quality problem of highway construction. The insufficient compaction is one of the important reasons for the early destruction of pavement. Compaction is an important link to make the subgrade and pavement materials to obtain sufficient compactness. It is an important means to monitor the compaction degree by using effective compactness detection method. This paper draws lessons from the research results of compactness measurement methods at home and abroad. In this paper, a real-time continuous measurement system of compaction degree is put forward to measure the compaction degree of soil. The advantages of this system are that it is convenient, fast and accurate to measure the compaction degree in a comprehensive and continuous way. Through theoretical analysis and indoor test, the basic composition of the vehicle-borne compaction measurement system is designed, and the selection of sensor and signal collector and the selection of parameters are determined. Data signal analysis and processing techniques. Based on system calibration test, shaking table test, The accuracy and reliability of the system are verified by field tests. The main conclusions are as follows: the variation of vibration signal of the vibration wheel of 1 / 1 reflects the compaction degree of soil. The method to reflect the actual compaction degree is correct through the analysis and processing of the exciting signal. The analysis of the actual exciting signal shows that the compaction degree of the subgrade soil is positively correlated with the stiffness of the soil and negatively correlated with the damping of the soil. The vertical vibration acceleration of the vibratory roller is positively correlated with the stiffness of the soil and negatively correlated with the damping of the soil. Based on the above analysis results, the "vibratory roller-soil" model and its simulation analysis are established. The positive correlation between the compaction degree of subgrade soil and the vertical vibration acceleration of vibratory roller is obtained. The compactness continuous testing system composed of computer data processing and analysis system is used to measure the compactness continuously. The processing and analyzing technology of acceleration detection data is put forward. 4. The vertical vibration acceleration of vibratory roller is put forward. The effective value represents the compaction degree of the compacted soil, The technique and method of the acceleration harmonic ratio to express the compaction degree of soil, the regression formula and the correlation coefficient between the compaction degree of sand soil and the effective value of vertical acceleration of vibration wheel under three different gradation and different optimum moisture content are obtained. The regression formula between compaction degree and vertical acceleration of vibrating wheel, compaction degree and harmonic ratio of acceleration, and correlation coefficient of 5. 5. The relationship between compaction degree y and acceleration effective value a of gravel soil with different fine grain content is put forward.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U416.1

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