Shear Properties of Grout-Rock Interface for Treatment of Mud Inrush
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Engineering College, Ocean University of China, Qingdao, 266100, China
Geotechnical and Structural Engineering Research Center, Shandong University, Jinan, 250061
Ji’nan Rail Transit Group Construction Investment Co., Ltd. Jinan, Shandong, 250000
Submission date: 2021-07-26
Final revision date: 2021-09-18
Acceptance date: 2021-09-27
Online publication date: 2022-01-25
Publication date: 2022-03-22
Pol. J. Environ. Stud. 2022;31(2):1783-1790
Grouting is an effective method to strengthen weak rock mass in tunnel engineering to prevent and control mud inrush disaster. The hardened grout-rock consolidation involves not only the properties of hardened grout, but also that of weak rock masses. As a transition region between them, the grout-rock interface determines the overall strength, then the shear properties of which was investigated in this study. The gushed mud from engineering project and a kind of Portland cement grout were selected as raw materials. A test system that can apply high injection pressure was developed to simulate the actual generation environment of grout-rock interface. By using it, two sets of samples with three different water-to-cement (W/C) ratios: 0.8, 1 and 1.5; and three different injection pressures: 1 MPa, 1.5 MPa and 2 MPa were prepared. After that, the direct shear test and SEM test were conducted to study the properties of grout-rock interface. The results show that lower W/C ratio and higher injection pressure can result in larger cohesive strength as well as internal friction angle of samples. When W/C ratio was decreased from 1.5 to 0.8, the former increased from 171.95 kPa to 251.55 kPa, and the latter rose from 32.31° to 41.71°. Also, they increased by 73.59 % and 17.64 %, respectively, with injection pressure ranging from 1 MPa to 2 MPa. It is hoped that the data provided will aid in the design of grouting with this material in the future.
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