Experimental Study on Sliding Soil of Ionic Soil Stabilizer-Reinforces
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摘要: 研究开发快速经济和行之有效的滑坡治理方法与理论, 一直是各国滑坡防治研究工作的重点.本试验研究使用一种经济适用的离子土固化剂(Ionic Soil Stabilizer, 简称ISS) 对提高滑带土的抗剪强度进行了探索.滑带土首先通过ISS不同配比水溶液的处理, 然后进行阿太堡试验、剪切试验、固结试验和自由膨胀率试验.试验结果表明: 滑坡滑带土在加入离子土固化剂后, 土的塑性指数降低, 粘聚力提高, 孔隙比和自由膨胀率减小.其机理为: 在以粘性土为主的滑带土中加入离子土固化剂, 通过物理化学原理, 它能取代吸附在粘土表面的可交换性阳离子, 改变粘土颗粒表面的双电层结构, 减小结合水膜厚度, 将滑带土的亲水性改为憎水性, 从而提高滑带土的抗剪强度.Abstract: Research and development of fast, economic and effective controlling method and theory of landslide has always been the focus of anti-sliding projects for all the countries.In this research, a new kind of economic and suitable Ionic Soil Stabilizer (ISS for short) for improving the shear strength of sliding soil is studied.The sliding soil is treated by different matches of ISS and water at first, then is tested in the Atterberg limits test, direct shear test, routine consolidation test and free swell test.The results show that the plastic index decreases, and the cohesion increases and the void-ratio deflates and the free swell shrinks after mixing the ISS into the sliding soil of landslide.The mechanism is that the sliding soil that consists mainly of clay soil is mixed with ISS, which can replace the exchangeable cationic of clay surface, changes the pair-electricity layer of soil grain surface, reduces the thickness of adsorbed water, transforms the hydrophilic sliding soil to the hydrophobic and increases the shear strength of sliding soil by the function of physics and chemistry.
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Key words:
- ionic soil stabilizer /
- sliding soil /
- plastic index /
- shear strength /
- adsorbed water
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图 1 加入ISS前后土颗粒结构示意图
Fig. 1. Sketch map of soil grain's structure mixed ISS (b) or not (a)
表 1 滑带土的粒度成分
Table 1. Granulometric composition of the sliding soil
表 2 滑带土的基本性质
Table 2. Basic property of the sliding soil
表 3 不同配比下滑带土的塑性指数
Table 3. Plastic indexes of the sliding soil in different matches
表 4 滑带土剪切试验成果
Table 4. Shear test of the sliding soil
表 5 滑带土固结试验成果
Table 5. Results of consolidation test of the sliding soil
表 6 滑带土的固结试验
Table 6. Consolidation tests of the sliding soil
表 7 滑带土的自由膨胀率试验
Table 7. Free expansion ratio test of the sliding soil
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