隧道裂隙岩体结构信息解译与危石垮塌空间展布规律研究

doi:10.13722/j.cnki.jrme.2021.0471

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Abstract The actual underground engineering of fractured rock mass，which is different from the structural engineering with relatively clear mathematical models，shows obvious uncertainty of rock mass structure as a heterogeneous and discontinuous medium. Especially for the tunneling projects closely related to the fractured rock mass excavation process，the analysis results by the mathematical models are quite different from the actual ones. For this issue，taking the geometry and distribution characteristics of rock mass fractures into consideration，a rock mass intelligent analysis and multivariate interpretation system was adopted to realize the adaptive extraction of rock mass structure information and further，by coupled the advanced geological prediction technology，the multi-scale fine construction of the tunnel fracture network model in fault-affected areas was achieved. Based on the 3DEC optimization model，the spatial distribution law of block collapse in the fault-affected areas of tunnels was studied，and systematical analysis and mathematical statistics of the shape，volume and quantity of collapse blocks in different excavation cycles were carried out. According to the sensitive geological parameters such as connectivity rate，DFN density and joint spacing，the spatial shape evolution law and response characteristics of dangerous tunnel rock groups under different rock mass and fracture combinations were revealed with 108 groups of simulations. The results provide a scientific basis for the prediction，identification，prevention and control of dangerous rock collapse in the process of tunnel and underground engineering construction in fractured rock mass areas and hence，are of great theoretical significance and engineering application value.

Key words： rock mechanics fractured rock mass dangerous rock collapse spatial distribution law characteristics interpretation discrete element method(DEM)

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	ZHENG Chengcheng1
	HE Peng1
	WANG Gang1
	SUN Shangqu1
	WANG Hongbo1
	XU Feng2
	JIANG Feng1

Cite this article:

ZHENG Chengcheng1,HE Peng1,WANG Gang1, et al. Structure information interpretation of fractured rock mass and spatial distribution law of dangerous rock collapse in tunnels[J]. , 2022, 41(3): 515-532.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.0471 OR https://rockmech.whrsm.ac.cn/EN/Y2022/V41/I3/515

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