Acid-soluble borehole drainage structure and construction method for karst or faulted tunnels and slopes

Abstract

The invention relates to the field of civil engineering, and discloses a drainage structure and a construction method for karst or fault tunnels and side slopes. The acid-soluble borehole drainage structure of the present application includes a hollow section and a grouting section. A water-stop member is arranged between the grouting section, and a water-permeable pipe is provided in the permeable section, and a cavity is provided in the water-permeable pipe, and a drain pipe extending outward through the water-stop member is arranged in the water-permeable pipe. The water-permeable pipe is filled with acid-soluble and water-insoluble solid filling materials, and the lower part of the water-stop component, the water-permeable pipe and the drain pipe are all acid-resistant materials or have acid-resistant surface layers. Through the drainage structure and the construction method, the controllability of construction of the drainage structure can be improved while ensuring the grouting pressure.

Description

technical field [0001] The invention relates to the field of civil engineering, in particular to a drainage structure and construction method for karst or fault tunnels and side slopes. Background technique [0002] Local groundwater seepage occurs when the waterproof layer or lining structure of the tunnel is defective. Especially in water-rich karst and fault tunnels, water seepage is more serious. Water seepage from the wall of the tunnel enters the tunnel, causing problems such as water accumulation and freezing, which affect the safety of tunnel operation. In addition, water seepage damages the inner structure of the tunnel lining concrete and surrounding rock, reduces the durability of the tunnel structure, and shortens the service life of the tunnel. [0003] For gas tunnels, tunnel water seepage is often mixed with harmful gases such as gas. Some harmful gases are flammable and explosive. The escape of harmful gases into the tunnel will pose a safety threat during t...

AI Technical Summary

Problems solved by technology

However, it has been found in engineering field tests that the melting of soluble crystals is difficult to be controlled artificially. If the construction of the grouting section encounters stagnation and the grout fails to fully solidify, the ice will gradually melt due to the effects of groundwater and ambient temperature. Does not have the effect of isolating the slurry

Images