Geomechanics and Engineering

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Experimental study on nano silica modified cement base grouting reinforcement materials

  • Zhou, Fei (College of Mining and Safety Engineering, Shandong University of Science and Technology) ;
  • Sun, Wenbin (Shandong Key Laboratory of Wisdom Mine Information Technology, Shandong University of Science and Technology) ;
  • Shao, Jianli (College of Mining and Safety Engineering, Shandong University of Science and Technology) ;
  • Kong, Lingjun (College of Mining and Safety Engineering, Shandong University of Science and Technology) ;
  • Geng, Xueyu (The University of Warwick Coventry)
  • Received : 2019.09.19
  • Accepted : 2019.12.26
  • Published : 2020.01.10
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Abstract

With the increasing number of underground projects, the problem of rock-water coupling catastrophe has increasingly become the focus of safety. Grouting reinforcement is gradually applied in subway, tunnel, bridge reinforcement, coal mine floor and other construction projects. At present, cement-based grouting materials are easy to shrink and have low strength after solidification. In order to overcome the special problems of high water pressure and high in-situ stress in deep part and improve the reinforcement effect. In view of the mining conditions of deep surrounding rock, a new type of cement-based reinforcement material was developed. We analyses the principle and main indexes of floor strengthening, and tests and optimizes the indexes and proportions of the two materials through laboratory tests. Then, observes and compares the microstructures of the optimized floor strengthening materials with those of the traditional strengthening materials through scanning electron microscopy. The test results show that 42.5 Portland cement-based grouting reinforcement material has the advantages of slight expansion, anti-dry-shrinkage, high compressive strength and high density when the water-cement ratio is 0.4, the content of bentonite is 4%, and the content of Nano Silica is 2.5%. The reinforcement effect is better than other traditional grouting reinforcement materials.

Keywords

Acknowledgement

Supported by : National Natural Science Foundation of China, China Postdoctoral Science Foundation, Natural Science Foundation of Shandong Province

This research was financially supported by the National Natural Science Foundation of China (Grant No.51974172), China Postdoctoral Science Foundation (2015M572067), Postdoctoral Innovation Project of Shandong Province (152799), Qingdao Postdoctoral Applied Research Project (2015203), Natural Science Foundation of Shandong Province (ZR2019MEE004)

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