Water-bearing rock stratum borehole wall structure and construction method

Abstract

The invention discloses a water-bearing rock stratum borehole wall structure and a construction method and belongs to a borehole wall structure and a construction method. The borehole wall is formed by an anchor pull rod I, an anchor pull rod II and a steel frame which are fixed on the surrounding rock, and concrete poured in a whole net frame to form a cylindrical borehole wall. The construction method comprises the following steps: manufacturing the anchor pull rod I and the anchor pull rod II on the surrounding rock body; then binding the borehole wall steel frame, connecting the anchor pull rod I and the anchor pull rod II with the steel frame, and connecting a pre-embedded grouting pipe; subsequently mounting a template and pouring the concrete; dismounting the template from the borehole wall and after the borehole wall reaches a certain strength, applying pre-tightening force to the anchor pull rod II by screwing an end nut; and finally grouting slurry via the pre-embedded grouting pipe in the anchor pull rod II, filling slurry liquid in holes in an interface between the borehole wall and the surrounding rock body through slurry transmission holes, and switching off a valve after finishing grouting the slurry. The water-bearing rock stratum borehole wall structure has the advantages that due to the fact that the borehole wall and the surrounding rock bear together, the radial stiffness of the borehole wall is improved, the accumulation of high-pressure water on the external surface of the borehole wall is avoided, and the structure has higher bearing force than that of a structure with the same section size and material, so the construction cost is greatly reduced, and the safety is improved.

Description

technical field [0001] The invention relates to a well wall structure and a construction method, in particular to a well wall structure and a construction method of a water-bearing rock formation. Background technique [0002] The construction of underground projects such as vertical shafts and inclined shafts first faces the design problem of the shaft wall (supporting structure). For water-free or shallow low-pressure water-bearing rock formations, due to the small load, the design and construction of the shaft wall are less difficult, and the engineering safety can be guaranteed. [0003] However, the existing shaft and inclined shaft wall design codes do not pay attention to the value of hydraulic load in rock formations; and for deep water-bearing rock formations, water pressure is the most important load on the shaft wall. If the water pressure is not considered correctly, the design thickness of the well wall will be too thin, resulting in the well wall being unable ...

AI Technical Summary

Problems solved by technology

In the high water pressure rock formation, the shaft wall structure poured by this process, on the one hand, there is no other bonding and anchoring effect between the shaft wall and the surrounding rock mass except for the natural bonding force between the concrete and the surrounding rock. Give full play to the bearing capacity of the surrounding rock mass itself; on the other hand, once the well wall structure is compressed inward, it is easy to peel off from the surrounding rock mass, resulting in the accumulation of external water pressure and bearing greater water pressure

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