黄土压实质量控制指标的科学性和合理性研究  

Study on the Scientific and Reasonable Expression of Compaction Quality Control Indicator of Loess

作　　者：杨晶[1,2] 王林浩[1] 马富丽[1] 白晓红[1] 

机构地区：[1]太原理工大学建筑与土木工程学院,太原030024 [2]太原电力高等专科学校土木工程系,太原030013

出　　处：《地下空间与工程学报》2012年第5期1021-1025,共5页Chinese Journal of Underground Space and Engineering

基　　金：国家自然科学基金(51178287);山西省自然科学基金(2010011029);山西省回国留学人员科研资助项目(2011-026)

摘　　要：回填地基或路基工程中,回填土的压实质量是导致沉降病害的一个重要原因。目前国内通常采用压实度作为填土压实质量控制指标。但压实度自身的准确性受诸多因素影响,若以压实度作为唯一重要指标是存在一定缺陷的。本文通过室内试验研究了不同击实能和含水量下压实黄土的压缩变形规律,分析了压实黄土土样空气体积率的变化规律。研究表明无论击实能如何变化,压实黄土土样的空气体积率在相应击实能对应的最优含水量附近时总是一定的。分析了采用空气体积率作为黄土压实质量附加控制指标的合理性。结合当地工程实际经验,建议在满足规范要求的前提下,以空气体积率不大于6.5%作为判定该地区黄土压实质量合格的参考指标,从而提高当地黄土状填土的压实质量。The disease caused by settlement of backfill foundation and road foundation often results in serious failures of filling project. One of the most important reasons is the quality of backfill. The degree of compaction is u- sually used as the compaction quality and control indicator of backfill in our country. But the degree of compaction is affected by various factors frequently. There may be some defects if the degree of compaction is used as the only im- portant indicator of the quality of backfill. In order to reduce the effect of these defects, this paper attempts to find other reasonable indicator to discuss this issue. In this paper, the compression deflection characteristics of compacted loess under different compaction energies and water contents were studied by laboratory experiment. The air porosities of compacted loess samples under the same compaction energy and different water content were analyzed. The study shows that when the water content is exactly the optimum water content, the air porosity of compacted sample is sta- ble. The rationality of using air porosity as the loess compaction quality control indicator is discussed. Combined with the local experience in practical engineering, it is proposed using air porosity less than 6.5% as the quality control additional indictor for region backfill compaction on the condition of meeting the requirements of codes, so that the compaction quality of loess backfill can be improved.

关 键 词：压实黄土 压实度 空气体积率 含水量 击实能 

分 类 号：TU444[建筑科学—岩土工程]