Shearing Strength of Sandy Clayey Purple Soil Reinforced with Sodium Silicate and Glass Fiber in Combination
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Supported by the National Natural Science Foundation of China(11572262, 41771312),Fundamental Research Funds for the Central Universities(No.(XDJK2018AB003)

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    Abstract:

    【Objective】Purple soil, a kind of sandy cohesive soil developed from purple sandy mudstone of the Shaximiao Formation of the Jurassic under frequent weathering and erosion, is widely distributed in regions of Chongqing and Sichuan. It is prone to disasters, such as shallow landslides and soil erosion. Purple soil is closely related to engineering construction, but at present there are few researches in the engineering field paying attention to any engineering properties of purple soil. In view of the fact that the soil is prone to geological disasters, it is particularly urgent to study how to reinforce purple soil in construction projects. Though the traditional cement reinforcement is not bad in effect when compared with other reinforcement ways, it will bring about damages to the soil sources. For instance, once reinforced with cement, the soil can never be used again for plant cultivation. In recent years, a novel soil reinforcing technology has emerged and is going to be more and more popular because it is environment-friendly and very good in effect on improving soil strength. Therefore, this study was conducted to explore effect of the use of a mixture of sodium silicate solution, calcium chloride solution and glass fiber on shearing strength of the soil relative to ratio of the three components.【Method】an experiment was conducted in a triaxial chamber that can keep the material therein free from consolidation and drainage, to explore effect of the mixture on soil shearing strength, relative to ratio of the mixture. In the mixture sodium silicate solution and calcium chloride solution, set as 1:1 in ratio, was blended with glass fiber varying in addition rate.【Result】 Results show that sodium silicate solution and calcium chloride solution acted jointly to gradually increased internal friction angle of the soil, but did not affect much its cohesion. When fiber was added in, cohesion significantly increased, and internal friction angle did too, though gradually. When fiber was added alone at a rate of 0.8%, Cohesion of the soil was maximized. When fiber was blended with the soil already treated with the two kinds of solutions at a rate of 20%, deviatoric stress curve of the soil rose gradually with rising glass fiber addition rate, and cohesion of the soil further increased too till fiber addition rate reached 0.8%, however internal friction angle of the soil did not very much.【Conclusion】As cohesion and internal friction angle of a soil are two important indicators of granular structure and erosion resistance of the soil, the research is expected to be able to serve as a scientific basis for control of soil erosion in sand-clayey purple soil areas though modification of the soil.

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ZHOU Chaoyun, WANG Shiji, ZHOU Chaoyun, HU Dongxu, HUANG Wei, HE Binghui. Shearing Strength of Sandy Clayey Purple Soil Reinforced with Sodium Silicate and Glass Fiber in Combination[J]. Acta Pedologica Sinica,2019,56(3):592-601.

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History
  • Received:June 19,2018
  • Revised:October 08,2018
  • Adopted:November 20,2018
  • Online: March 01,2019
  • Published: