Test on anti-scouring property of grouting reinforced body in completely weathered granite
LIU Jinquan1，2，CHEN Weizhong3，YUAN Jingqiang1
(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)
Abstract：Water inrush is a common geological disaster in tunnel construction in completely weathered granite soil，and the loss of soil particles and the anti-scouring property are the keys to determine the water inrush. Therefore，a simple device for grouted sample manufacturing and an anti-erosion device were made to manufacture the samples of compaction grouting and fracturing grouting and to simulate the vital process of grouting reinforced solid being flushed by the flowing water. With these devices，a series of tests were carried out by controlling a number of factors such as the grouting capacity，the velocity of dynamic water，the curing time and the initial water content of the soil. The index of the particle erosion rate(PER) was proposed to evaluate the loss of soil particles and the anti-scouring property. The test results showed that the anti-scouring property was improved with the increasing of grouting capacity and curing time. However，the particle erosion rate was increased significantly with the increasing of dynamic water velocity，and the anti-scouring property was poor when the initial soil water content was very low or very high. There existed an optimum initial water content to make the anti-scouring property the best. The range of grout cementation over grouting capacity(ratio of grouting cementation) changed parabolically with the grouting capacity. The peak of grouting cementation ratio moved to the direction of high grouting capacity with the increasing of water velocity. A new method to calculate the grouting capacity and the principal of partition treatment of water inrush was proposed according to the test results.
刘金泉1，2，陈卫忠3，袁敬强1. 全风化花岗岩注浆加固体抗冲刷特性试验研究[J]. 岩石力学与工程学报, 2016, 35(9): 1767-1775.
LIU Jinquan1，2，CHEN Weizhong3，YUAN Jingqiang1. Test on anti-scouring property of grouting reinforced body in completely weathered granite. , 2016, 35(9): 1767-1775.
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2016, Vol. 35 
