Laponite RD透明土模拟软黏土的适用性分析  

Applicability Analysis for Laponite RD Transparent Clay in Simulating Natural Soft Clay

作　　者：叶恬 易立达 胡孟娴 张仪萍[1] Ye Tian;Yi Lida;Hu Mengxian;Zhang Yiping(College of Civil Engineering and Architecture,Zhejiang University,Hangzhou 310012,China)

机构地区：[1]浙江大学建筑工程学院

出　　处：《科技通报》2019年第6期154-159,164,共7页Bulletin of Science and Technology

基　　金：国家自然科学基金(51579219)

摘　　要：评估Laponite RD透明土作为岩土实验材料的适用性。首先,以透射率作为评估透明度的指标,基于透明土透射率的测量结果,给出了Laponite RD透明土适用的实验厚度范围。其次,制备不同强度的透明土试样,进行了渗透试验、固结试验、直接剪切试验和固结不排水三轴压缩试验,将透明土的物理力学指标与天然软黏土的物理力学指标进行了对比分析。试验结果表明,Laponite RD透明土的渗透性能和天然软黏土相当,固结系数却远小于多数天然软黏土,黏聚力较多数天然软黏土略小,而内摩擦角大致处于天然软黏土的分布范围内。基于试验结果分析可知,Laponite RD透明土可较好地模拟天然软黏土的渗透性能,其次是模拟强度特性,而用于模拟压缩等变形特性时则可能与实际软黏性土相距较大。In this paper, we are aimed to estimate the applicability for Laponite RD transparent clay as an experimental material. First, we measured transmissivity, which is a factor for transparency estimation, for Laponite RD clay of varying thickness, and provide an applicable thickness range. Afterwards, we made transparent clay samples with different strength, with which we conducted permeability tests, consolidation tests, direct shear tests and consolidated-undrained triaxal tests. We contrast the physical and mechanical index gained through these tests with natural soft clay and find out that: the permeability property of Laponite RD clay is comparable to natural clay;the consolidation index is smaller than most soft clay;the cohesion is slightly smaller, while the friction angle factor is within the distribution of natural soft clay. In conclusion, Laponite RD transparent clay can effectively simulate the permeability property of natural soft clay;its simulation to strength property is not perfect but also acceptable;while in simulation to compressibility property, it may cause much inaccuracy.

关 键 词：透明土 软黏土 渗透性 压缩性 强度 

分 类 号：TU44P.2[建筑科学—岩土工程]