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| Experimental study on mechanical properties of grouting consolidating bodies with inner defects |
| LU Haifeng1，2，CAO Aide1，LIU Quansheng1，2，ZHANG Han1，WU Yuexiu1，2，WEI Zhichao1#br# |
| (1. School of Civil Engineering，Wuhan University，Hubei，Wuhan 430072，China；2. Key Laboratory of Geotechnical and Structural Safety Engineering of Hubei Province，Wuhan University，Wuhan，Hubei 430072，China) |
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Abstract Grouting is a commonly used reinforcement method in geotechnical engineering. The grouting consolidation bodies formed in actual engineering projects are generally inner-defect-containing，and the failure of the grouting consolidation bodies is actually the destruction of those internal defects. In this paper，a preparation method of samples with internal defects is designed and a series of mechanical tests of samples with internal defects are conducted. The numerical method of PFC2D is used to carry out the numerical contrast test on the inner-defect-containing grouting consolidation bodies(IGCB). The test results demonstrate that the number and position of internal defects have a significant effect on the strength of grouting consolidation bodies and the failure of IGCB first occurs at the defect position. In the initial stage of failure，a small amount of micro-shear cracks and micro-tensile cracks respectively appear at the upper and lower positions around the hole. With the loading process going on，the micro-tensile cracks at each defective point continue to extend and finally run through，resulting in a final destruction of the sample. The preparation method of samples with internal defects and the research work can provide some theoretical supports for design and construction in grouting engineering as well as some new ideas for other similar projects.
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2020, Vol. 39 
