裂隙充填膨润土湿胀变形防渗规律实验研究

发布时间：2018-05-16 20:37

本文选题：膨润土 + 膨胀变形　；参考：《非金属矿》2016年06期

【摘要】：为解决裂隙岩体防渗问题,联合采用高压固结仪和三轴渗透仪,进行不同含水率等条件下膨润土的膨胀和渗透实验,对膨润土的有荷膨胀特性和渗透特性进行分析研究,结果表明:膨润土的膨胀率随含水率变化符合逻辑斯蒂曲线关系,膨润土的吸湿膨胀表现为短程膨胀和长程膨胀两个阶段,短程阶段的膨胀变形幅度比长程阶段明显;当含水率相同时,初始干密度越大,膨胀变形量越大,膨胀力与干密度呈正指数关系;当初始干密度相同时,膨胀率随荷载增大而降低,且含水率越高降低幅度越大;膨润土的渗透率与含水率成负指数关系,且在较低含水率情况下渗透率随含水率的增大急剧下降至零,膨润土是裂隙岩体防渗的理想材料。
[Abstract]:In order to solve the problem of seepage prevention in fractured rock mass, the swelling and permeation experiments of bentonite under the conditions of different water content were carried out by high pressure consolidation apparatus and three axis osmotic apparatus. The swelling and permeability of bentonite were analyzed and studied. The results showed that the swelling rate of bentonite was in accordance with the relationship of logical Christian curve with the change of water content. The swelling and expansion of bentonite is characterized by two stages of short range expansion and long range expansion. The expansion deformation amplitude in the short stage is more obvious than that in the long stage. When the water content is the same, the larger the initial dry density, the larger the expansion deformation, the positive exponential relationship between the expansion force and the dry density, and the expansion rate decreasing with the increase of the load when the initial dry density is the same. The higher the water cut is, the greater the decrease of the water content and the negative index of the permeability and water content of bentonite, and the permeability decreases sharply to zero with the increase of water content. Bentonite is an ideal material for seepage prevention in fractured rock mass.
【作者单位】：辽宁工程技术大学力学与工程学院;
【基金】：国家自然科学基金(51574137)
【分类号】：TU443

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