Water stopping treating method for water burst of tunnel fracture crushing zone

Abstract

The invention relates to a treating method for water burst of a mountain area tunnel fracture crushing zone. The treating method comprises the following steps that according to the tunnel stopping zone underground water system boundary, the boundary condition, the initial condition and fault factor generalization, an MODFLOW procedure based on a porous medium model is adopted to conduct model building and hydrogeological parameter identification on a bedrock mountain area fissured waterbearing stratum; tunnel factor generalization, instantaneous water inflow calculation and stable water inflowcalculation are conducted on the basis of a hydrogeological model; and on the basis of the tunnel water inflow calculation result, the drain hole water stopping pressure-bearing mode of tunnel surrounding rock is determined by combining with tunnel lining pressure reduction to conduct a water stopping pressure-bearing test so as to determine relevant parameters, and thus tunnel drainage is implemented by applying an optimized water control mode. Pressure releasing drainage hole and lining construction is combined with eco-society water demands to form a comprehensive treating method, the pressure-relief part can be flexibly adjusted, the construction pressure is decomposed, the surrounding rock is reinforced, and engineering building and safety are effectively ensured.

Description

technical field [0001] The invention belongs to the treatment of water gushing in the construction of deep and long bedrock fissure tunnels in mountainous areas, and in particular relates to a water-stopping treatment method for water gushing in fractured and broken zones of tunnels in mountainous areas. Background technique [0002] Bedrock fissure water is one of the most widely distributed groundwater types in my country. Its strong heterogeneity makes its occurrence rules complicated. In tunnel engineering construction, the enriched bedrock fissure water poses an important threat to construction and operation safety, while Water gushing in fault fracture zones is a very prominent geological engineering problem. At the same time, water gushing in the tunnel will also cause the groundwater level to drop, causing the groundwater to be drained within a certain area, posing a threat to the ecology of the tunnel site area, residents’ life, and water for industry and agriculture...

AI Technical Summary

Problems solved by technology

At the same time, water gushing in the tunnel will also cause the groundwater level to drop, causing the groundwater to be drained within a certain area, posing a threat to the ecology of the tunnel site area, residents’ life, and water for industry and agriculture. Improper handling may even cause public disputes. Therefore, the water gushing problem in the tunnel is related to the national economy and the people’s livelihood. need to be handled properly

[0003] At present, the common engineering methods to deal with the water inrush in the tunnel fault fracture zone include grouting to strengthen the surrounding rock and drilling drainage holes. Stress feedback; in terms of research on the conceptual model of water gushing in tunnels, most of them are based on simplified empirical formulas or numerical simulation calculations, which have poor engineering applicability, and it is difficult to implement lining structures in the state of water gushing

At the same time, there are few water control designs that comprehensively consider the ecology of the tunnel site area, water use for social functions, and safe construction and operation. Most of them consider the water stop of the tunnel alone, which makes it difficult to coordinate the sustainable coexistence and development of ecology, social water use, and tunnel construction.

[0004] For example, the Chinese patent CN 101625352A discloses a tunnel excavation karst water inrush test method and monitoring device. This invention can simultaneously study the changing rules of multi-field information of tunnel excavation-induced water inrush precursors under different water-bearing body positions and different water pressures. , has the advantages of wide application range, high reliability, rich data collection, and high test accuracy. It includes many devices and precision instruments, but the requirements for the instrument environment are high, and the operation steps of the test process are relatively complicated.

Another example is the Chinese patent CN102608263A, which discloses a research method for fault water inrush based on the combination of seepage field and stress field. Coupling effects with the stress field, without considering small-scale water gushing characteristics and comprehensive synergistic water-stopping

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