Calculation of Filling Ratio of Fissures for Curtain Grouting by Acoustic Velocity of Rock Masses. Issue 1 (February 2021)

• Record Type: Journal Article
• Authors: Liu, Haitao; Xu, Fuxing; Dong, Liang; Xiong, Youliang
• Is Part Of: IOP conference series. Volume 660:Issue 1(2021)
• Publication Date: 2021-02
• Subjects: Earth sciences -- Periodicals; Environmental sciences -- Congresses; Environmental sciences -- Periodicals; 550.5
• DOI: 10.1088/1755-1315/660/1/012079
• Languages: English
• ISSNs: 1755-1307

Abstract

Abstract: In the construction of hydropower projects, the detection method for curtain grouting has not been recognized for the filling the fissures at present. This paper calculates the filling ratio of fissures in rock masses using acoustic velocity data before and after grouting. According to a simplified two-phase model of rock mass, a calculation formula of filling ratio for rock mass fissures is derived from acoustic velocity. The rock mass velocity ratio curve before grouting is fitted according to Poisson distribution formula to obtain the rock mass velocity, and then the filling ratio for rock mass fissure grouting is calculated by combining water, cement, rock mass velocity before and after grouting. The filling ratio of fissures in the rock mass after curtain grouting by using the acoustic velocity of the rock mass in a hydropower project can be mutually verified by the results of the borehole TV and water pressure test.