Strengthening technology for soft plastic collapse body karst tunnel

Abstract

The invention discloses a strengthening technology for a soft plastic collapse body karst tunnel. The strengthening technology comprises the steps that S1, surveying is carried out, a jet grouting pile technology is adopted at a soft foundation, and a steel flower pipe pile technology is adopted at a rock layer; S2, drilling is carried out by using the jet grouting pile technology , and a hole isdrilled at a positioning position through a rotary vibration drilling machine; S3, a grouting pipe is lowered, and drilling and lowering the grouting pipe are completed at the same time; S4, jet grouting is carried out, after a jet pipe is inserted into a predetermined depth, jetting operation is carried out from bottom to top, and a columnar jetting pile solidified body is formed after jetting construction is finished; S5, drilling is carried out by using the steel flower pipe pile technology, the position of the rock layer is confirmed, and a deep hole drilling machine is used for drilling;S6, lowering a pipe and grouting are carried out, and a steel flower pipe is grouted through a horn grouting pump until completely dense grouting is achieved; and S7, testing process is carried out, and a geological drill drilling and coring method is used for testing. By adopting a composite foundation treatment method combining a jet grouting pile and a steel flower pipe pile, the strengtheningtechnology overcomes the defect of " paying attention to a vault and making light of a tunnel bottom" in the prior tunnel construction, and thus the operation safety is ensured.

Description

technical field [0001] The invention relates to the technical field of reinforcement technology, in particular to a reinforcement technology for soft plastic collapsed karst tunnels. Background technique [0002] Due to the large buried depth, long tunnel body and complex geological conditions, the tunnel project will encounter a series of special geological problems during the construction process, such as: karst, weak fracture zone, joint development of surrounding rock, faults, etc. Among them, Karst tunnels are the most common and most harmful. Due to their sudden occurrence and difficult location, their scale and dynamic characteristics are difficult to predict. In addition, the underground engineering space is limited, which often brings great harm to engineering construction and causes a large number of surrounding rocks. Instability, blocked tunnels, buried equipment, scrapped tunnels, or accidents involving personal injury or death will cause serious losses to the c...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a soft-plastic collapse body karst tunnel reinforcement process, which has a simple structure, low cost, and is easy to use. The method improves the shortcomings of the previous tunnel construction of "heavy arch top and light tunnel bottom", avoids disasters such as mud churn and mud leakage in the future operation process, ensures the advantages of operation safety, and solves the problem of incomplete reinforcement of the tunnel bottom. The problem of mud-flooding and mud-flowing at the bottom of the tunnel