基于连续压实质量检测的压实薄弱区域评价指标研究

Evaluation of Compaction Weak Areas Based on Continuous Compaction Quality Detection

压实薄弱区域评价是铁路路基填筑工程连续压实质量控制与验收的重要内容。本文针对现行压实薄弱区域评价体系未综合考虑薄弱区域压实指标、面积以及空间分布的问题,提出压实体积的概念并定义薄弱区域压实指标、面积综合评价指标U,引入地统计学中的最近邻指数法并确定薄弱区域空间分布评判指标R。结合沪昆高速铁路路基试验段现场试验数据,比较现行压实薄弱区域评价指标与新指标U、R的评价结果,结果表明:综合使用指标U、R能够较全面地评价薄弱区域质量,新指标U、R的验收目标值分别为1%和0.5。本文研究为进一步完善铁路路基填筑工程连续压实质量评价体系提供了新方法。

Evaluation of compaction weak areas is an important part in railway subgrade compaction quality control and acceptance. In view of the disadvantage that the existing evaluation system of compaction weak areas does not include the characteristics of measurement value, area and spatial distribution of weak areas, the concept of ＂compaction volume＂ was proposed and the weak area index and area comprehensive evaluation indicator U was defined. The nearest neighbor index method in geo-statistics was introduced to determine the weak area spatial distribution evaluation index R. Using the test data of subgrade test section of Shanghai-Kunming high speed railway, a comparison was made on the evaluation results between the existing compaction weak area evaluation indicators and new indicators U and R. The results proved the applicability and advantages of U and R when the two indicators evaluated the compaction quality of weak areas together. The acceptance target values of comprehensive indicators U and R were determined to be 1% and 0. 5 respectively. The results provided a new reference for the evaluation system of the continuous compaction quality of railway subgrade.