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| Dynamic and static damage characteristics of deep-earth white sandstone#br#
under dry-acid erosion |
| NI Suqian1，XU Ying1，2，GE Jinjin1，2，WANG Fengyao3，XIE Haotian1，DING Jinfu1 |
(1. School of Civil Engineering and Architecture，Anhui University of Science and Technology，Huainan，Anhui 232001，China；2. State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines，Anhui University of Science and Technology，Huainan，Anhui 232001，China；3. China Railway 15th Bureau Group Road and Bridge
Construction Co.，Ltd.，Nanjing，Jiangsu 211899，China) |
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Abstract In order to ensure the safety of underground mining operations，the“three tests and one model”multi-directional rock damage mechanism research method was proposed. The results show that：(1) In the dry-acid erosion environment，the damage rate of the rock mass changes from a slow response at the early stage to an increased response in the middle and late stages. The damage response is gradually exhausted at the late stage and basically proportional to the hydrogen ion concentration index. (2) After the impact，the peak stress and elastic modulus of the rock mass decrease with the increase of the number of dry-acid erosion，and the overall damage shows the softening phenomenon. The damage deterioration of the rock mass increases in the late erosion period. (3) Under uniaxial compression，the elastic potential energy of the rock increases with the increase of axial load，and its energy growth rate is not obvious. The ratio of elastic potential energy to the total energy is the smallest at the axial load of about 80 kN. In the early three stages，the ratio of plastic dissipation energy to the total energy becomes smaller. The percentage of plastic dissipation energy tends to increase in the later plastic phase，i.e.，near damage failure. (4) Assuming that the rock strength of white sandstone follows the Weibull distribution，a statistical damage constitutive model of rock that can better reflect the residual strength of white sandstone is constructed. The accuracy of the model is effectively verified by the results of uniaxial compression tests. This research results greatly improve the safety of deep rock mining and provide a new idea for damage research of underground rock mining operations.
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2023, Vol. 42 
