Mining method construction method for subway tunnel with upper soft rock stratum and lower hard rock stratum in high karst area

Abstract

The invention discloses a mining method construction method for a subway tunnel with an upper soft rock stratum and a lower hard rock stratum in a high karst area. The construction method comprises the following steps of determining a joint position between the upper soft rock stratum and the lower hard rock stratum in the high karst area, and determining an axis which transversely extends along the center of the joint position and is the center line of the tunnel; determining a construction area, an area above a center line as a first construction area and an area below the center line as a second construction area, the first construction area being located at a soft rock stratum position of the high karst area, and the second construction area being located at a hard rock stratum position of the high karst area; and determining a construction method, selecting a first preset construction method for excavation and tunneling in the first construction area, and selecting a second presetconstruction method for excavation and tunneling in the second construction area. The advantages of the method are fully and efficiently utilized under the conditions of upper-soft lower-hard rock stratum geology and shallow burial depth, the defects of the method are avoided, and the working efficiency is remarkable.

Description

technical field [0001] The invention relates to the technical field of tunnel excavation, in particular to a mining construction method for subway tunnels in upper and lower hard rock layers in high karst areas. Background technique [0002] With the development of urban construction, traffic is also constantly upgrading. The subway is a way of digging underground tunnels to bring convenient and fast routes. However, with the deepening of excavation, more and more difficulties are encountered. Some tunnels The environment of the crossing area is complex, which brings about technical problems in construction; [0003] 1. In the case of shallow buried depth of tunnels affected by topography and geology, the tunnels still need to pass through residential areas, schools, and mountainous areas on the ground, and the tunnels in the interval, [0004] 2. The upper section of the interval tunnel is located in the soft siliceous rock, and the lower section is mainly limestone and mo...

AI Technical Summary

Problems solved by technology

[0002] With the development of urban construction, traffic is also constantly upgrading. The subway is a way of digging underground tunnels to bring convenient and fast routes. However, with the deepening of excavation, more and more difficulties are encountered. Some tunnels The environment of the crossing area is complex, which brings about technical problems in construction;

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