Widening excavation construction method for high-strength rock slope under traffic-keeping condition

Abstract

The invention discloses a widening excavation construction method for a high-strength rock slope under a traffic-keeping condition, and the method is characterized by comprising the following steps: 1, erecting and fixing a protective bent frame along the slope surface of a side slope in a to-be-constructed area; 2, sequentially dividing the to-be-constructed area divided into a first constructionarea, a second construction area and a third construction area from left to right according to the blasting safety distance, and dividing any construction area into a plurality of construction layersfrom top to bottom according to the blasting depth; 3, constructing multiple construction layers according to the principle from left to right and from top to bottom, wherein the construction layer of the first construction area is constructed through a loosening blasting method, the construction layer of the second construction area is constructed through a gas fracturing method, and the construction layer of the third construction area is constructed through a static force cutting method. According to the method, the construction areas are classified, and the different construction areas are constructed through the combined technology, thereby improving the efficiency of widening construction of the high-strength rock cutting on the premise that existing traffic safety operation is guaranteed.

Description

technical field [0001] The invention relates to the field of roadbed construction. More specifically, the present invention relates to a construction method for widening and excavating a high-strength rock slope under the condition of maintaining passage. Background technique [0002] In recent years, in domestic and foreign expressway reconstruction and expansion projects, for high-strength rock slope widening and excavation construction, according to different geological conditions, the main construction methods are: blasting construction, gas fracturing, static crushing and mechanical excavation. In the actual construction process, for deep-excavation road cuttings with hard rocks: the blasting construction method is powerful and can quickly break down hard rocks, but the sand splash generated by blasting construction will affect the existing traffic flow, and there is a safety risk; Compared with blasting, cracking is less powerful, and with the increase of blasting dis...

AI Technical Summary

Problems solved by technology

In the actual construction process, for deep-excavation road cuttings with hard rocks: the blasting construction method is powerful and can quickly break down hard rocks, but the sand splash generated by blasting construction will affect the existing traffic flow, and there is a safety risk; Compared with blasting, cracking is less powerful, and with the increase of blasting distance, the energy attenuation is greater, it is difficult to break hard rock, and multiple constructions are required, and gas cracking in the outer layer of the slope also has the risk of collapse and rolling stones; the static cracking method takes a cracking time of one time It is long, and the hole spacing is small, the drilling workload is large, the economic cost is high, the progress is slow and the output is low, and it is not suitable for the excavation of a large amount of stonework; the efficiency of mechanical chisel removal is low, and it is difficult to meet the construction requirements of the site

[0003] To sum up, the use of different existing construction methods to widen and excavate high-strength rock slopes has problems such as affecting traffic safety and low construction efficiency.

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