Karst landform cavity treatment method

Abstract

The invention belongs to the technical field of cavity treatment, and discloses a karst landform cavity treatment method. The karst landform cavity treatment method comprises the steps of tunnel bottom grouting reinforcement, tunnel body primary support reinforcement, pile foundation construction, joist construction and tunnel body lining, wherein in the pile foundation construction step, construction preparation, pile casing burying and following, drilling machine installation, slurry preparation, percussion drilling hole forming construction, final hole detection, hole cleaning, reinforcement cage manufacturing and installation, underwater concrete pouring and quality inspection and testing are conducted; in the joist construction step, foundation pit excavation, foundation treatment, reinforcement and formwork construction and concrete pouring are conducted; and in the tunnel body lining step, waterproof and drainage construction, lining reinforcement construction and concrete construction are conducted. According to the karst landform cavity treatment method, targeted grouting reinforcement is conducted according to the tunnel bottom soil type, a tunnel bottom silty clay section is subjected to phi 76 steel flower tube steel tube group pile grouting reinforcement treatment, tunnel bottom karst filler is solidified, and thus the tunnel bottom safety is higher; a secondary lining mode is adopted in the tunnel body lining process, and thus firmness is higher; and a tunnel is further subjected to waterproof and drainage treatment, and thus water leakage of the tunnel can beeffectively prevented.

Description

technical field [0001] The invention belongs to the technical field of solution cavity treatment, and in particular relates to a method for solution cavity treatment of karst landforms. Background technique [0002] At present, in the engineering construction process of karst landform, water gushing and karst caves of different sizes often affect the engineering construction. Karst is the dissolution phenomenon of surface water and groundwater on soluble rock formations through chemical and mechanical damage. Different karsts develop into Different karst caves, fissures, etc. The unfavorable geological elements of tunnels in karst areas include fault areas, weak surrounding rocks, mud inrush, gullies, karst caves, and goafs. When the project needs to pass through soluble rock layers, some surrounding Rock slices are broken and prone to collapse. Some karst caves are located at the bottom, and the filling is soft and deep, which makes the tunnel base difficult to handle. The...

AI Technical Summary

Problems solved by technology

[0005] 1. The pile foundation construction at the bottom of the tunnel, due to the narrow space, deep pile length, complex geological conditions at the bottom of the tunnel, the equipment needs to be refitted, it is difficult to form holes, and the risks of hole collapse, necking, and drill sticking are relatively high;

[0006] 2. After the pile foundation is formed into holes, it takes a long time to install the reinforcement cage due to the narrow space, and the holes are prone to collapse;

[0007] 3. During the construction of the pile foundation, the initial support that has been applied is disturbed, which may easily cause cracking and deformation of the initial support, and the safety risk is high;

Images