基于压路机—土体非线性系统动力响应的压实质量连续检测方法研究

项目名称： 基于压路机—土体非线性系统动力响应的压实质量连续检测方法研究

项目编号： No.51478481

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 建筑环境与结构工程学科

项目作者： 聂志红

作者单位： 中南大学

项目金额： 83万元

中文摘要： 基于机-土系统动力响应的连续检测方法是压实质量检测的发展方向。机-土动力响应计算模型、土体动力参数识别方法、动力参数与压实指标的量化关系是影响检测结果的三个主要因素。本项目通过对压路机动态响应的现场测试分析，给出压路机振动模式与轮-土关系的判别方法与指标；通过动三轴试验，获得振动压路机荷载下土体变形特征，确定适用于机-土系统的土体计算模型；建立反映多种振动模式、轮-土接触关系、土体变形特征的机-土非线性系统动力响应计算模型；分析系统动态响应信号，利用增量谐波法识别机-土系统多种振动模式下的土体动力参数；从作用于土体能量与土体位移关系出发，阐明土体动力参数与压实指标的内在关系，提出压实质量连续检测的指标。研究成果将完善压实质量连续检测的基础理论，为提高压实质量检测结果的准确度，保证土工构筑物压实质量提供理论支持。

中文关键词： 压实质量；连续检测方法；机-土系统模型；动力响应；参数识别

英文摘要： Continuous detection method based on the dynamic response of roller-soil system is the development direction of compaction quality detection. The calculation model of dynamic response of roller-soil system, identification method of dynamic parameters of soil mass and quantitative relation between dynamic parameters and compaction index are three main factors that influence detection result. Through the field test and analysis of the dynamic response parameters of the roller, this study revealed the influence of the degree of compaction of soil on the vibration mode of roller, and also revealed the contact relation between wheel and soil. A dynamic tri-axial test was employed to obtain the soil deformation characteristics under the load of vibratory roller, and to determine a calculation model suitable for the roller-soil system. The dynamic response signal of the system was analyzed based on the established dynamic response calculation model of roller-soil nonlinear system that reflects various vibration modes and roller-soil contact relationship. The method and index for identifying the vibration mode of roller were also given. The incremental harmonic balance method was used for the identification of the dynamic parameters of soil mass under different vibration modes. Based on the comparative test and theoretical analysis, the relationship between soil dynamic parameters and compaction index was established. Thus, an index was proposed for the detection of continuous compaction quality. This research result will improve the basic understanding for the detection of continuous compaction quality. It will also provide theoretical support in realizing higher precision of compaction quality detection and in assuring the compaction quality of earthen structure.

英文关键词： Compaction Quality;Continuous Detection Method;Roller-soil System Model;Dynamic Response;Parameter Identification