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.
Key Words
floor reinforcement with grunting; nano silica; scanning electron microscope
Address
Fei Zhou and Lingjun Kong — College of Mining and Safety Engineering, Shandong University of Science and Technology, Shandong 266590, China
Wenbin Sun — Shandong Key Laboratory of Wisdom Mine Information Technology,Shandong University of Science and Technology, Qingdao 266590, China
Xueyu Geng — The University of Warwick Coventry, CV4 7AL, U.K.
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