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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摘要三峡工程175 m蓄水后，峡谷区内多次发生新生地质灾害事件，岩溶岸坡消落带岩体劣化引起广泛关注。通过野外调查、原位测试和室内试验等大量工作，首次系统阐述三峡库区岩溶岸坡消落带浅表层岩体劣化特征。从岩体宏观劣化现象来看，不同岩体结构和岸坡结构的岩体劣化宏观表现有非常大的差异，包括溶蚀/溶解、裂缝显化与扩展和机械淘蚀等现象。浸泡–风干循环后的灰岩样品力学参数平均每循环下降率约为0.7%；随着循环次数的增加，岩样强度下降可用指数函数形式拟合，相关性系数大于0.84。箭穿洞地表破碎灰岩岩体声波年下降率为11.23%。青石岩溶岸坡浅层岩体多期钻孔声波对穿试验测试明显表明：地下岩体的劣化以结构面的劣化为主，其声波年下降率为10%～60%。这些认识和数据从不同角度展示出岩溶岸坡消落带浅层岩体劣化的独特特征：岩石的低劣化率夹杂结构面的高劣化率，具有不均一性；根据风化界线或岩体裂隙分带，在区内或带内则有相近的劣化率，具有分带性。根据这一特征，建立等效连续模式和结构面模式的岩体劣化力学模型。本研究工作指引了库区岩体劣化方向上未来研究重点，将为三峡库区水位变动带地质灾害隐患点防灾减灾工作提供重要支撑。

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	黄波林1
	殷跃平2
	张枝华3
	王健1
	秦臻1
	闫国强3
	4

关键词 ：岩石力学, 三峡库区消落带, 岩溶岸坡, 浅层岩体劣化特征, 劣化率, 岩体劣化力学模型

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

引用本文:

黄波林1，殷跃平2，张枝华3，王健1，秦臻1，闫国强3，4. 三峡工程库区岩溶岸坡消落带岩体劣化特征研究[J]. 岩石力学与工程学报, 2019, 38(9): 1786-1796.
HUANG Bolin1，YIN Yueping2，ZHANG Zhihua3，WANG Jian1，QIN Zhen1，YAN Guoqiang3，4. Study on deterioration characteristics of shallow rock mass in water the level fluctuation zone of karst bank slopes in Three Gorges Reservoir area. , 2019, 38(9): 1786-1796.

链接本文:

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

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