Excavation support construction method for high slope of oblique stratum

Abstract

The invention discloses an excavation support construction method for a high slope of an oblique stratum. The method includes the construction procedures of site cleaning, excavation of cover layers,gradient segment drilling and blasting excavation, excavation of building foundation surface protection layers, research on safety and stability to determine support modes and optimization and adjustment. Gradient excavation is adopted in the excavation process; the step height is determined according to the principle that pre-cracking is conducted on slope design lines from top to bottom and fromoutside to inside, excavation of the cover layers and alluvium of all the layers is conducted first, then stonework excavation is conducted after free faces are formed, and riding tracks adopt the excavation mode that protective layers are reserved; according to geological conditions of the oblique stratum, a blasting technology is reasonably studied, blasting parameters are reasonably adjusted to achieve a great excavation effect, and overbreak, underbreak and secondary treatment are reduced to ensure the excavation quality. According to the provided excavation support construction method for the high slope of the oblique stratum, the excavation quality is improved, the overbreak is avoided, and the stability of the slope and the construction safety are ensured.

Description

technical field [0001] The invention relates to the technical field of hydropower engineering, in particular to an excavation and support construction method for high side slopes in oblique rock formations. Background technique [0002] At present, many small and medium-sized hydropower stations are planned to be located in the geologically developed areas of oblique rock strata. On the basis of the difficulty of excavating high slopes, the excavation construction has increased the problem of lateral stability and safety. Currently, the excavation of dams under oblique geological conditions The research on this aspect is not mature, and the construction method of excavation and support for high slopes in oblique rock strata with good effect has not yet been produced. In the past construction, due to the complicated geological conditions, the safety problems during the construction process were prominent, and the dam excavation construction could not be carried out smoothly u...

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the shortcomings existing in the prior art that the excavation quality cannot be guaranteed under oblique geological conditions, the over-excavation is serious, the construction is not smooth and the economic effect is poor, and to provide a method for improving the excavation quality, avoiding over-excavation and Construction method of excavation and support for slopes with high oblique rock formations to ensure slope stability and construction safety

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