滇中引水工程砂化白云岩隧洞围岩地质特征与破坏机制

doi:10.13722/j.cnki.jrme.2023.0279

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Abstract Sandy dolomite often has broken structure，with complex geological environment. It is prone to occur collapse，water inrush and sand gushing，induce the ground collapse and other disasters. Consequently，the construction of underground engineering in this stratum face several problems such as great excavation and supporting difficulties and high safety risk. There are five water conveyance tunnels passing through sandy dolomite strata in Yuxi section of central Yunnan water diversion project. In this paper，geological survey and analysis，microstructure testing and analysis were used to obtain the spatial distribution characteristics of sandy dolomite along the tunnels，with different sandy grades. Through geological survey in the construction period，case statistics of surrounding rock instability，theoretical analysis and induction，the influence factors of surrounding rock instability of sandy dolomite tunnel were summarized，the failure mechanism of surrounding rock was explored，and targeted prevention and controlling measures were put forward. The results show that：(1) The spatial distribution and sandification degree are closely related to the scale and distance of faults. In the vertical zonation，the sandification degree is gradually deepen from the surface to depth. Furthermore，strongly and severely sandy dolomite is the main surrounding rock mass in this project. (2) The influence factors of surrounding rock instability of sandy dolomite tunnel are mainly sandy grade，faults，groundwater condition and excavation disturbance. (3) Under anhydrous conditions，gravity-driven and stress-rock mass structure composite-driven surrounding rock collapse is prone to occur. In addition，under the condition of water-rich section，the failure modes are mainly water inrush and sand gushing，and the mechanism is mainly seepage instability. (4) Advanced geological prediction and dynamic risk evaluation of disaster occurrence are important measures for disaster prevention and controlling of sandy dolomite tunnels. The construction of slurry stop wall and consolidation grouting of surrounding rock are specific measures to deal with water and sand inrush. Construction experience still needs to be accumulated and summarized. The research results have certain guiding value for the disaster prevention and control of surrounding rock of sandy dolomite tunnel.

Key words： rock mechanics water diversion project in central Yunnan sandy dolomite spatial distribution microstructure failure mechanism of surrounding rock mass

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	Articles by authors
	DONG Jiaxing1
	ZHOU Zhiqiang1
	ZHAO Yongchuan2
	MI Jian2
	LI Jianguo2
	LIU Xiaoning2
	LI Chao2
	ZHOU Lunshun1
	SHEN Zhenluo1
	MU Hongyuan2

Cite this article:

DONG Jiaxing1,ZHOU Zhiqiang1,ZHAO Yongchuan2, et al. Study on geological characteristics and failure mechanism of surrounding rock of sandy dolomite tunnel in water diversion project in central Yunnan[J]. , 2024, 43(S1): 3464-3476.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2023.0279 OR https://rockmech.whrsm.ac.cn/EN/Y2024/V43/IS1/3464

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