盐腔内回填碱渣沉降固结特性室内试验研究

发布时间：2019-03-22 20:48

【摘要】：碱渣回填到充满卤水的废弃盐腔后,颗粒会自由沉降到盐腔底部形成沉积层,进而在自重作用下固结。为了解盐腔内回填碱渣的沉降固结特性,以江苏淮安地区碱渣为对象,进行了沉降柱试验和固结试验。试验结果表明:(1)碱渣在卤水中的沉降过程可以分为3个阶段:絮凝阶段、沉降阶段和固结阶段。初始浓度对碱渣的沉降曲线和沉降速率有很大的影响。(2)碱渣颗粒分布、密度、含水率和孔隙比均呈现出分层特性,颗粒粒径、密度随深度的增加而增大,含水率、孔隙比随深度的增大而减小。(3)碱渣具有很高的压缩性,压缩系数a1-2为3.36 MPa-1。在压力范围小于100 kPa下,固结系数随固结压力的增加而显著减小。试验结果对了解盐腔内回填碱渣的沉降固结特性提供了参考,有利于指导回填施工工艺和碱渣的后期处理。
[Abstract]:After the alkali slag is filled into the waste salt chamber filled with brine, the particles will settle freely to the bottom of the salt chamber to form a sedimentary layer, and then consolidated under the action of self-weight. In order to understand the settlement and consolidation characteristics of alkali slag backfilled in salt chamber, the settlement column test and consolidation test of alkali slag in Huaian area of Jiangsu Province were carried out. The experimental results show that: (1) the sedimentation process of alkali slag in brine can be divided into three stages: flocculation stage, sedimentation stage and consolidation stage. The initial concentration has a great influence on the settlement curve and sedimentation rate of alkali slag. (2) the distribution, density, water content and pore ratio of alkali slag have the characteristics of stratification, the particle size and density increase with the increase of depth, and the water content of alkali slag increases with the increase of depth. The porosity ratio decreases with the increase of depth. (3) Alkali slag has high compressibility with a compressibility of 3.36 MPa-1.. When the pressure range is less than 100 kPa, the consolidation coefficient decreases significantly with the increase of the consolidation pressure. The experimental results provide a reference for understanding the settlement and consolidation characteristics of alkali slag backfilled in salt chamber, which is helpful to guide the backfilling construction technology and the later treatment of alkali slag.
【作者单位】：重庆大学西南资源开发及环境灾害控制工程教育部重点实验室;中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室;
【基金】：国家自然科学基金(No.51304187)
【分类号】：TU41;TU521

【参考文献】