Efficient and environment-friendly mountain excavation tunnel-entering construction method

Abstract

The invention relates to an efficient and environment-friendly mountain excavation tunnel-entering construction method. The efficient and environment-friendly mountain excavation tunnel-entering construction method comprises the following steps of slope top catchwater construction, passive protection net construction, vegetation cleaning, active protection net construction, pregrouting for rock consolidation, concrete guide wall construction, large pipe shed construction, and tunnel entrance through a core soil reserving method. Earth-rock open cutting engineering scale and engineering quantity on a tunnel opening portion can be greatly reduced, manpower and material resource input of earth-rock open cutting can be reduced or avoided, meanwhile, tunnel opening area excavating can be reduced to the maximum degree, damage to mountain vegetation and ecological environment can be reduced to the maximum degree, ecological balance and mountain stress balance of the tunnel opening portion canbe kept, the natural disaster induced by the construction can be avoided or reduced, meanwhile, procedure conversion of tunnel opening open cutting and tunnel excavating can be quickened, the time can be effectively shortened, and tunnel excavating construction capacity can be formed as soon as possible.

Description

technical field [0001] The invention relates to a construction method, in particular to an efficient and environment-friendly mountain excavation construction method. Background technique [0002] The development task of the existing hydropower station irrigation area is mainly irrigation, taking into account both urban and rural life and industrial water supply. Some engineering tectonic units are located in the Sichuan platform depression, a secondary tectonic unit of the Yangtze quasi-platform, and belong to the fold-detachment structure area of ​​the Sichuan inland basin caprock. The exposed formations are mainly Jurassic to Cretaceous clastic sedimentary rocks and Quaternary loose accumulation layers. The landform along the line is generally low mountain and hilly landform dominated by structural erosion and denudation, with thick surface covering and lush vegetation. [0003] At this stage, the conventional and traditional tunnel entry method is usually the slotting ...

AI Technical Summary

Problems solved by technology

[0003] At this stage, the conventional and traditional tunnel entry method is usually the slotting method, excavating side slopes, and using lock anchors / pipe sheds / steel arches for pre-supporting methods; this construction method has a large construction area, Destroying the ecological environment of the mountain and the stress balance of the mountain can easily cause instability of the slope at the entrance of the cave, landslides, loss of topsoil, and small debris flows into the cave.

Images