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

Abstract

The invention relates to an efficient and environment-friendly mountain excavation and cave entering construction method. The method comprises the following steps of slope crest intercepting ditch construction, passive protective net construction, vegetation cleaning, active protective net construction, rock mass pre-grouting consolidation, concrete guide wall construction, large pipe shed construction and reserved core soil method cave entering. According to the method, the earthwork open excavation engineering scale and engineering quantity of the hole opening part can be greatly reduced, the investment of manpower and material resources for open excavation of earthwork is reduced or avoided, meanwhile, excavation of a cave entrance area and damage to mountain vegetation and the ecological environment are reduced to the maximum extent, ecological balance of the cave entrance area and stress balance of a mountain are kept, and natural disasters induced by construction are avoided or reduced. Meanwhile, the process conversion of hole opening excavation and hole excavation can be accelerated, the time is effectively shortened, and the hole excavation construction capacity is formedas soon as possible.

Description

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

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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.

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