Intrinsic compression behavior of remolded sand-clay mixture
Intrinsic compression behavior of remolded sand-clay mixture
复制标题
重塑砂土混合物的固有压缩行为
DOI：
10.1139/cgj-2016-0453
复制
发表时间：
2017
影响因子：
3.6
通讯作者：
Wang Qiong
中科院分区：
文献类型：
--
作者：
Chu Chengfu;Wu Zilong;Deng Yongfeng;Chen Yonggui;Wang Qiong
对纯粘土和不同砂/粘土比和粘土矿物组成的砂-粘土混合物进行了一系列增量加载试验。引入空隙指数Iv和Iv H来评价其本征压缩性。试验结果表明，Iv比IvH更适合描述纯粘土的压缩特性;而对于砂-粘土混合物的压缩特性，由于砂粒的存在，使用Iv得到的归一化压缩线与纯粘土和传统土的压缩线有明显差异。因此，引入砂-粘土混合物的四阶段分析框架，以统一有砂和无砂土的固有压缩特性。结果发现，更新的粘土孔隙指数Ivc参数是有效的，统一土壤的压缩行为，排除砂骨架形成前的粘土中的砂粒的影响。在砂骨架形成后，颗粒簇改变了混合料的应力分布，使粘土基质上的应力减小，从而导致本征压缩行为的分叉。
A series of incremental loading oedometer tests was conducted on pure clays and sand–clay mixtures with various sand/clay ratios and clay mineral compositions. The void indexesIvandIvHwere introduced to evaluate their intrinsic compressibility. Test results revealed thatIvwas more suitable for depicting the compression behavior of pure clays thanIvH; whereas, for the compressibility of sand–clay mixtures, the normalized compression line by usingIvwas obviously different from that of pure clays and traditional soils due to the presence of sand particles. Therefore, a four-phase analysis framework of sand–clay mixtures was introduced to unify the intrinsic compression behavior of soils with and without sands. It was found that the updated clay void indexIvcparameter was effective to unify the soil’s compression behavior by excluding the influence of sand particles in clays before the sand skeleton formation. After the formation of the sand skeleton, the cluster particles change the stress distribution of mixtures, leading to less stress being applied on the clay matrix and thus the bifurcation of the intrinsic compression behavior.