三峡工程库区岩溶岸坡消落带岩体劣化特征研究

doi:10.13722/j.cnki.jrme.2018.1535

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Abstract After the impoundment of 175 m above the sea level of the Three Gorges Reservoir，several geo-hazards happened in gorge areas，resulting in wide attention to the deterioration of rock mass in the water level fluctuation zone of karst bank slopes. Based on field investigations as well as in-situ and laboratory tests，the deterioration characteristics of shallow rock mass in the zone were systematically summarized for the first time in this paper. From the perspective of macro-deterioration phenomena of rock mass including dissolution，crack manifestation and propagation，and mechanical erosion，the macro-deterioration performance of karst rock masses with different structures is very different. The mechanical parameters of limestone samples averagely decrease by about 0.7% after an immersion-air drying cycle，and the strength of the samples decreases with rising the number of cycles in an exponential function with a correlation coefficient larger than 0.84. The annual decline rate of the acoustic wave in fractured limestone of Jianchuandong is 11.23%. Borehole multi-period acoustic penetration test results show that the deterioration of underground karst rock mass is mainly deterioration of structure planes and the annual decline rate is about 10%–60%. These works show the unique deterioration characteristics of shallow karst rock mass such as a low deterioration rate of rock accompanied with a high deterioration rate of structural planes，non-uniformity，and zonation of the deterioration rate according to the weathering or fracture zones of rock mass. Based on these characteristics，two deterioration models of rock mass respectively corresponding to equivalent continuous mode and structural plane mode were established. This research points out the future research focus of deterioration properties of rock mass in reservoirs and provides an important support for the prevention and mitigation of potential geological hazards in the water level fluctuation zone in Three Gorges Reservoir area.

Key words： rock mechanics water level fluctuation zone in Three Gorges Reservoir area karst bank slope deterioration characteristics of shallow rock mass deterioration ratio mechanical models of rock mass deterioration

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	Articles by authors
	HUANG Bolin1
	YIN Yueping2
	ZHANG Zhihua3
	WANG Jian1
	QIN Zhen1
	YAN Guoqiang3
	4

Cite this article:

HUANG Bolin1,YIN Yueping2,ZHANG Zhihua3, et al. Study on deterioration characteristics of shallow rock mass in water the level fluctuation zone of karst bank slopes in Three Gorges Reservoir area[J]. , 2019, 38(9): 1786-1796.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2018.1535 OR http://www.rockmech.org/EN/Y2019/V38/I9/1786

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