Dynamic compaction properties of bentonite-based materials
Dynamic compaction properties of bentonite-based materials
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DOI：
10.1016/j.enggeo.2008.01.005
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发表时间：
2008-05
影响因子：
7.4
通讯作者：
Hiroshi Ito;H. Komine
中科院分区：
文献类型：
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作者：
Hiroshi Ito;H. Komine
采用5种不同理化性质的粉状膨润土，对膨润土含量分别为100、70和50%的膨润土基材料进行了动态压实试验，建立了膨润土基材料动态压实性能的简化评价方法。在一定的膨润土含量和总压实能条件下，根据膨润土的种类，确定了膨润土的最大干密度ρdmax和最佳含水量wopt这两个著名的压实性能指标。为了评估本研究中得出的BBM的这些值，BBM的塑性极限wpbbm定义为，在含砂BBM的情况下，使用粉碎至最大粒径小于425 μm的样品测量的塑性极限，而在无砂BBM的情况下，使用粉状膨润土本身测量的塑性极限。本文提出了在总压实能551-2755 kN-m/m3条件下，用wpbbm计算膨润土含量大于50%的bbm的ρ dmaxs和wopt的方程。最后，我们将本研究导出的方程与前人提出的压实BBM水力学性能评价方程联系起来，提出了原位压实法制备膨润土含量大于50%的BBM缓冲材料的方法。
Dynamic compaction tests of bentonite-based materials (BBMs) with 100, 70 and 50% bentonite contents have been performed using five powdery bentonites with different physicochemical properties to establish the simplified evaluation method for dynamic compaction properties of BBMs. For a given bentonite content and a total compaction energy condition, the maximum dry density, ρdmax, and the optimum water content, wopt, which are well-known indexes of compaction properties, for BBMs were determined according to the type of bentonite used for BBMs. For evaluation of those values of BBMs derived in this study, the plastic limit of BBM, wpbbm, was defined as the plastic limit that was measured using the sample pulverized to a maximum grain size of less than 425 μm in the case of BBM with sand having a maximum grain size of more than 425 μm and was measured using the powdery bentonite itself in the case of BBM without sand. This study proposed equations for evaluating ρdmaxand woptof BBMs with more than 50% bentonite content under the total compaction energy conditions of 551–2755 kN-m/m3using wpbbm. Finally, we related the equations derived in this study to the equation for evaluating hydraulic properties of compacted BBMs proposed in previous work and proposed the preparation method of BBMs with more than 50% bentonite content for constructing BBM buffer by in-situ compaction method.