煤矸石改良膨胀土承载比特性研究

RESEARCH ON CBR OF EXPANSIVE SOIL IMPROVED BY COAL GANGUE

膨胀土路基工程中常发生膨胀、沉降等问题严重影响工程质量。同时,随着煤的大量生产,其副产品煤矸石也越来越多,不仅占用了大量土地,还对环境造成污染。在膨胀土中加入煤矸石,研究煤矸石改良膨胀土的承载比特性。研究表明:随着膨胀土中煤矸石掺量的增加,膨胀土的CBR值呈先增大后减少的关系,在最佳含水率时膨胀土中煤矸石的掺量分别为30%,35%,40%,45%,50%的五组试验中,发现膨胀土中煤矸石含量为35%时对膨胀土的承载比特性改良效果最佳。

In the engineering of subgrade which used the expansive soil had frequently came out such kind problem as expansion,sedimentation,etc. But at the same time,with the production of the coal becoming larger and larger,its byproduct,the coal gangue were also much more. Not only a large acre of land had been occupied,but also it polluted the ecology. We had already tried to put some coal gangue into the expansive soil to observe whether it can make a difference to the California Bearing Ratio of the expansive soil. The research showed that with the level of coal gangue in the expansive soil gradually increasing,its CBR showed a correlation that first increase then decrease with the level of coal gangue in the expansive soil gradually increasing. In the six group trial,with the best level of water in the expansive soil,the level of the coal gangue were 30%,35%,40%,45%,50%,55% perspectively. We found out that coal gangue content in the expansive soil was 35% bearing ratio characteristics of expansive soil improvement effect is best.