High dam spillway foundation drainage system and excavation method

Abstract

The invention discloses a large-span high-side-wall underground space building and an excavation supporting method thereof so as to solve the problems of large heading face, complex construction process, long construction period, inadaptability with deformation characteristics of soft and weak strata and high excavation supporting expense in a conventional underground space building. The large-span high-side-wall underground space building comprises an underground space building body, wherein a plurality of boundary line pre-anchoring holes are formed in the boundary line of the side wall of the underground space building body; a plurality of outer boundary line pre-anchoring holes are formed in the outer side of the boundary line of the side wall of the underground space building body; the boundary line pre-anchoring holes are communicated with the outer boundary line pre-anchoring holes through corresponding through pre-anchoring holes; through pre-stressed anchor rods or cables are arranged in the through pre-anchoring holes. According to the invention, the large-span high-side-wall underground space building is excavated by anchoring and excavating the soft and weak strata according to the prior art based on the characteristic that small holes excavated in the soft and weak strata are easily formed, the excavation supporting process is simple, and the building is stable.

Description

technical field [0001] The invention relates to the field of excavation and support for underground buildings, in particular to a large-span and high-side wall underground space building and an excavation and support method thereof, which are mainly used for large-span and high-side-wall underground space buildings in weak rock formations under construction. Background technique [0002] In the 21st century, with the development of my country's national economy, the adjustment of national strategies, the needs of national defense construction and the development of urban infrastructure, the space structure of underground large-span high-side walls is gradually increasing, such as large-span pumped storage underground workshops, underground military storage, Air defense facilities, urban railway tunnels, etc., but the rocks are often weak in the areas where construction is required, and the conditions for forming holes are poor. Existing excavation and support technology, tha...

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Problems solved by technology

[0003] In order to overcome the problems of the existing large-span and high-side wall underground space excavation and support for large excavation surface, complex construction technology, long construction period, incompatibility with the deformation characteristics of weak rock formations, and high excavation and support costs, the present invention aims to To provide a large-span and high-side wall underground space building and its excavation and support method, it is easy to form a small cavern by excavating a small cavern in a weak rock stratum, and by first anchoring and then digging, that is, for a certain range of the top arch and high side wall After pre-reinforcing the weak rock strata, excavate the large-span and high-side wall underground space buildings according to the existing technology, the excavation support is simple, and the buildings are stable

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