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| Experimental study on second diagenesis by compaction and consolidation of soft and broken rock |
| WANG Ping1，2，3，4，YU Weijian2，3，FENG Tao2，3，ZHU Yongjian2，3，HUANG Zhong3，REN Heng3，ZHAO Xun3 |
| (1. Work Safety Key Lab on Prevention and Control of Gas and Roof Disasters for Southern Goal Mines，Hunan University of Science and Technology，Xiangtan，Hunan 411201，China；2. Hunan Provincial Key Laboratory of Safe Mining Techniques of Coal Mines，Hunan University of Science and Technology，Xiangtan，Hunan 411201，China；3. School of Resource and Environment and Safety Engineering，Hunan University of Science and Technology，Xiangtan，Hunan 411201，China；4. Hunan Province Key Laboratory of Coal Resources Clean-utilization and Mine Environment Protection，Hunan University of Science and Technology，Xiangtan，Hunan 411201，China) |
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Abstract To study the mechanism of secondary diagenesis of the weak and broken rock，the compaction device developed in-house was used to investigate the factors affecting the secondary diagenesis and the mechanical behavior of the specimen after diagenesis. The results show that the secondary diagenesis process has a compaction-broken stage and a consolidation diagenesis stage. The eccentric core extrusion and the core extrusion are two main mechanisms at the compaction-broken stage，whereas，the self-cementation and the bonding among coarse blocks are the main diagenesis mechanisms at the consolidation stage. The breakage and consolidation indexes were proposed to characterize the level of difficulty in rock breaking and the degree of the consolidation diagenesis respectively. The statistical results show that，for the rock with large size，the large irregularity coefficients result in greater difficulty in compaction. In addition，the secondary diagenesis is affected by the water content. The compaction of the rock powder with the particle size smaller than 1 mm can be fulfilled when the water content is higher than 4.76%. The uniaxial compressive strength of secondary diagenetic specimens decreases linearly with the increasing in particle size. The triaxial compressive strength of the secondary diagenetic specimen increases with the water content in a relationship of cubic polynomial，increases linearly with the compaction stress but decreases with the increasing of particle size in a cubic polynomial manner.
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2018, Vol. 37 
