新颖的路基压实度测定方法的研究

摘要

叙述了用瞬态冲击法快速、无损测量路基压实度（土壤坚实度）的方法及技术关键。对不同压实度、含水量的土壤进行了测定，提出了在瞬态冲击下，存在新的SX水滞规律。SX水滞频率范围为0～FSX，在该频段内压实度响应的功率谱图接近于水平线，且几乎与含水量和频率无关；用冲击响应的功率谱值作为测量指标具有较高的分辨力，能区分不同压实度时的响应值。不同的土壤，响应谱值与压实度之间具有不同的回归方程。本文对于深入研究瞬态冲击法测定路基压实度（土壤坚实度）的机理及其进行测量装置的设计具有重要的指导作用，为解决国内外利用激振法无需测含水量就能得到现场压实度数值奠定了基础。%This paper discusses the method and technical keys of rapid and nondestructive measurement of subgrade compactness (soil compactibility) by instantaneous impulsion method. By measuring different kinds of soil with different compactness and moisture content, the authors put up a new law of SX water-retardation in a state of instantaneous impulsion. The law provides that the SX water-retardation frequency ranges from 0 to FSX, and in this range, the power spectrum graph of the compactness response approaches to a horizontal line, i.e, the response spectrum value has almost no connection with the frequency and the moisture content of soil. This power spectrum of impulsion response can be used as the compactness measuring index due to its better resolving power, and can distinguish the response value of different compactness, that is, for different kinds of soil, there is a different regression equation between the compactness and the response spectrum value. It has great directive function in further researching the mechanism of measuring the subgrade compactness (soil compactibility) by instantaneous impulsion method and in designing measuring instrument. It also can lay a foundation for acquiring the on-the-spot compactness value without knowing its moisture content.