ORIGINAL RESEARCH
Shear Properties of Grout-Rock Interface
for Treatment of Mud Inrush
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1
Engineering College, Ocean University of China, Qingdao, 266100, China
2
Geotechnical and Structural Engineering Research Center, Shandong University, Jinan, 250061
3
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
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ABSTRACT
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.