Construction method for high side slope of loosen and calaclastic rock

Abstract

The invention discloses a construction method for a high side slope of loosen and calaclastic rock. According to the method, the loosen and calaclastic rock is pre-reinforced by grouting to form into a solidified composite layer which effectively isolates influence of blasting shock waves to the slope and the rock behind the slope when subsequent blasting excavation is performing, and thus the completeness of the slope is improved and the stability of the side slope is increased; meanwhile, after the construction of first-level side slope is completed, the slope is immediately supported by cable anchors, so that the stability of the first-level side slope is well controlled, disturbing influence of presplitting blasting in the excavation of next level of side slope to the upper level of side slope is reduced at the same time, and engineering accidents are avoided. According to the stable excavation method employed by the invention, excavation is performed after the slope is pre-reinforced, and supporting is performed immediately, so that the first-level side slope is reinforced and supported at one time, the construction efficiency is improved, and the construction cost is saved.

Description

technical field [0001] The invention belongs to the technical field of slope excavation in geotechnical engineering, and in particular relates to a construction method for a high slope with loose and fractured rock. Background technique [0002] my country is a mountainous country. In recent years, with the country's increasing investment in infrastructure construction projects, there are more and more road and railway construction projects. In the construction of roads and railways in mountainous areas, roads often pass between river valleys and mountains, and the construction of these projects often involves the excavation of high rocky slopes. Under the influence of geological structure and long-term physical, chemical and biological weathering and erosion, slope rock mass often becomes loose, weak, and fragmented. At the same time, there are joints, faults, and dikes inside the slope rock mass structural surface. Therefore, the excavation of the slope often further det...

AI Technical Summary

Problems solved by technology

When the slope rock mass is relatively broken, blasting excavation will easily cause over-excavation and under-excavation, which directly affects the quality of the slope formation, and even requires secondary treatment, which affects the construction period and increases costs; "upper protection and lower gear" Systematic pile-anchor construction method, that is, anchor piles are installed at the bottom of the slope, and retaining walls and prestressed anchor cables are used on the slope surface. For slope engineering, if the construction of retaining walls and prestressed anchor cables is not timely, the rock surface on the slope surface will be exposed for too long, and rock blocks will slip, which will make the slope protection project very troublesome and affect the progress and cost of the project; On the one hand, the weight of the retaining wall is relatively large, and the loose and broken rock mass is difficult to meet the required load-bearing requirements)

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