Rock and Soil Mechanics ›› 2020, Vol. 41 ›› Issue (6): 2034-2042.doi: 10.16285/j.rsm.2019.1388

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Study on new sodium silicate-ester grouting material and its properties of grouted-sand

RONG Chi1, 2, CHEN Wei-zhong1, 3, YUAN Jing-qiang1, ZHANG Zheng4, ZHANG Yi5, ZHANG Qing-yan1, 2, LIU Qi1, 2   

  1. 1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China; 2. University of Chinese Academy of Sciences, Beijing 100049, China; 3. Geotechnical and Structural Engineering Research Center, Shandong University, Jinan, Shandong 250061, China; 4. Road & Bridge International Co., Ltd., Beijing 100084, China; 5. Zichengmao (Shanghai) Engineering Technology Co., Ltd., Shanghai 200050, China
  • Received:2019-08-12 Revised:2019-10-31 Online:2020-06-11 Published:2020-08-02
  • Contact: 陈卫忠，男，1968年生，博士，研究员，博士生导师，主要从事隧道及地下工程方面的教学及研究工作。E-mail: wzchen@whrsm.ac.cn E-mail: rongchi17@mails.ucas.edu.cn
  • Supported by:
    This work was supported by the Research Project of Innovation Groups in Hubei Province(2018CFA012) and the General Program of National Natural Science Foundation of China (51879258).

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Abstract: In view of the poor stability of aeolian sand slope and the problems such as difficult hole-forming and limited reinforcement in commonly used reinforcement technologies, the new sodium silicate-ester slurry with binary acid ester as curing agent is proposed to reinforce aeolian sand. The gel time and the time-varying behavior of viscosity of new sodium silicate-ester slurry are systematically tested by inverted cup method and rotational viscometer respectively. The influences of different slurry filling rates on the strength and permeability of grouted-sand are studied by triaxial test. The results show that the gel time is between 20 s and 60 min. The viscosity of the slurry increases exponentially with time and the viscosity is low before gelation. When the slurry filling rate increases from 0% to 100%, the cohesion of grouted-sand increases linearly from 0 kPa to 148.4 kPa, and the internal friction angle increases from 32.1° to 37.8° according to the parabolic law, and the permeability coefficient decreases from 3.42×10?5 cm/s to 8.74×10?7 cm/s. Comparing with sodium silicate-phosphoric acid slurry and sodium silicate-sulfuric acid slurry, the compressive strength of grouted-sand reinforced by new sodium silicate-ester slurry is higher. The research results of this paper provide a new method for the reinforcement of aeolian sand slope.

Key words: aeolian sand slope, new sodium silicate-ester slurry, gel time, time-varying behavior of viscosity, reinforcement effect

CLC Number: 

  • TU 411
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