摘要
为提高煤矸石利用率及解决公路工程选用膨胀土时需对其进行改良的问题,论文将煤矸石粉作为膨胀土的改良剂,通过室内直剪试验,对比分析掺4%、8%、12%煤矸石粉对膨胀土抗剪强度的影响,并通过煤矸石浸泡液pH值及X射线衍射分析了改良机理。结果表明：抗剪强度的增加主要是由于黏聚力的增加,改良机理为煤矸石稳定后的浸泡液pH值在3.8~5.8之间,溶液为酸性,导致膨胀土的含水率降低,黏聚力增大,且XRD衍射图谱中经过经浸泡过后的煤矸石的衍射强度减小,证明其发生了一系列化学反应,析出的物质可与膨胀土胶结或发生离子交换反应提高了黏聚力,从而增加了膨胀土的抗剪强度。
In order to improve the utilization rate of coal gangue and solve the problem of expansive soil, direct shear tests were conducted using coal gangue powder as ameliorant. The impact of gangue powder to expansive shear strength was analyzed at the rate of 4%, 8% and 12%, and the improving mechanism was studied from the view of soak solution pH value and gangue powder X - ray diffraction. The results showed that, the increase of shear strength was mainly caused by the increasing cohesion, and the improving mechanism was that the soaking solution pH value was between 3.8 to 5.8, and the acidic solution decreased the water content of expansive soil, increasing the cohesion, and the diffraction intensity of gangue powder after soaking decreased, proving that a series of chemical reactions happened, precipitation of substances cemented with expansive soil or ion exchange reaction increased cohesion, enhancing the shear strength of expansive soil.
出处
《煤炭工程》
北大核心
2014年第9期123-125,共3页
Coal Engineering
