Abstract
Insufficient compactness of rockfill materials may potentially cause excessive deformation of a concrete face rockfill dam (CFRD), thus resulting in cracking of the face slab and leakage of the dam body, thereby requiring reinforcement treatment. To date, there are no effective measures in strengthening rockfill materials. In this study, self‐compacting mortar (SCM) was applied to the Shibaozhai CFRD in Gansu Province, China, to test the effectiveness of grouting reinforcement. Simultaneously, an indoor triaxial shear test was conducted to investigate the changes in the mechanical properties of rockfill materials before and after the grouting reinforcement. The on‐site test results showed that the rockfill reached the desired porosity after grouting and grouting reinforcement enhanced the cementation degree of rockfill materials while maintaining uninterrupted drainage capacity, which met the requirements of rockfill grouting for the face rockfill dam. The results of the triaxial shear test indicated that the cohesive force of the rockfill materials rose by 3.95 times and the modulus increased by 7.24 times after grouting reinforcement，significantly enhancing the mechanical and deformation properties of the rockfill. An increase in the content of coarse particles was shown to enhance the stability of cementitious structures, which leads to a better skeleton effect and thereby raises the effectiveness of the grouting reinforcement. The rockfill materials also exhibited strain‐softening characteristics following the grouting reinforcement. The research showed that grouting reinforcement technology is suitable for managing the deformation of high CFRDs or reinforcing ill rockfill dams.
Highlights
To study the grouting reinforcement effect of self-compacting mortar (SCM) on the rockfill materials of the concrete face rockfill dam (CFRD), an on-site grouting reinforcement test was conducted, and the results were analyzed with a pit inspection, core drilling, density logging, in-hole TV camera, and water injection permeability test
E on-site grouting reinforcement test of the CFRD showed that SCM was a feasible grouting material because it diffused in a controlled area around the grouting hole, filled the large pores, reduced the porosity, and developed a certain degree of cementation while still maintaining good water permeability in the rockfill materials
The feasibility of grouting with the SCM was verified by an on-site grouting reinforcement test, and indoor triaxial shear test was performed to evaluate the mechanical properties of rockfill materials before and after grouting. e following conclusions were drawn: (1) e on-site grouting reinforcement test showed that SCM-based grouting reinforcement technology increased the compactness of the rockfill materials and degree of interparticle cementation while allowing a certain porosity and free drainage
Summary
Experimental Study on Grouting Effect and Mechanical Properties of the Rockfill Materials Grouted with SCM. Insufficient compactness of rockfill materials may potentially cause excessive deformation of a concrete face rockfill dam (CFRD), resulting in cracking of the face slab and leakage of the dam body, thereby requiring reinforcement treatment. Self-compacting mortar (SCM) was applied to the Shibaozhai CFRD in Gansu Province, China, to test the effectiveness of grouting reinforcement. E results of the triaxial shear test indicated that the cohesive force of the rockfill materials rose by 3.95 times and the modulus increased by 7.24 times after grouting reinforcement,significantly enhancing the mechanical and deformation properties of the rockfill. To study the grouting reinforcement effect of SCM on the rockfill materials of the CFRD, an on-site grouting reinforcement test was conducted, and the results were analyzed with a pit inspection, core drilling, density logging, in-hole TV camera, and water injection permeability test.
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