Systematic control structure and method for ultrahigh steep rock slope

Abstract

The invention relates to a systematic control structure and method for an ultrahigh steep rock slope. High prevention and pre-fixation are firstly adopted for an upper natural side slope, dangerous sources such as blocks or dangerous stones locally existing in the upper natural side slope are prevented and treated, an engineering side slope excavation affected area in the natural side slope is reinforced in advance, and the problem that the upper natural side slope and the lower engineering side slope interfere with each other is completely solved. Stable excavation and appropriate protectionare adopted for the lower engineering side slope, the engineering side slope is properly protected, and the overall stability of the engineering side slope is ensured. The upper natural side slope andthe lower engineering side slope are systematically controlled, and the control effect is comprehensive and thorough. A pre-fixing method is adopted for an excavation affected area, stress and strainof the side slope excavation affected area are controlled through anchor cable pre-stress actively applied in advance, further development of a plastic yield zone to the upper portion is prevented, adverse effects of side slope excavation of a lower project on an upper natural side slope are thoroughly avoided, and the purposes of having have an anchor to windward and conducting accurate prevention and control are achieved.

Description

technical field [0001] The invention relates to the field of slope engineering prevention and control, in particular to an ultra-high and steep rock slope system prevention structure and method. Background technique [0002] Slope is a geological body with air condition on the surface of the crust, which is composed of slope top, slope surface, slope foot and rock and soil mass at a certain depth below it. According to the height characteristics of slopes, slopes with a slope height of less than 10m are low slopes, 10m to 30m are medium and low slopes, 30m to 70m are medium slopes, 70m to 150m are high slopes, and 150m to 300m are super high slopes. Slopes above 300m are ultra-high slopes; according to the steepness and gentleness of slopes, those with slopes below 10° are gentle slopes, 10°-30° are slopes, 30°-45° are medium slopes, and 45°-60° are medium slopes. ° is a steep slope, 60°~75° is a steep slope, 75°~90° is an upright slope, and more than 90° is an inverted slo...

AI Technical Summary

Problems solved by technology

[0004] 1. The excavation of super-high and steep rock engineering slopes causes the deformation and even instability of the upper natural slope. The engineering slope formed by excavation is generally located in the lower part of the slope, and there may be a natural slope of more than 100 meters or even hundreds of meters in the upper part.

Since a large amount of rock mass outside the slope is excavated by the engineering slope, it is equivalent to excavating the support body at the lower part of the slope, which affects the integrity of the slope, which not only adversely affects the stability of the engineering slope, but also affects the upper part of the engineering slope. The overall stability of the natural slope also has a very negative impact

The traditional super-high and steep rock slope prevention and control structures and methods are generally only for the prevention and control of engineering slopes, without systematic consideration of the overall stability of the upper natural slope of the engineering slope, which may lead to deformation or instability of the upper natural slope, and then threaten The safety of the slope of the lower part of the project may cause incalculable losses to the project

[0005] 2. The local stability of ultra-high and steep rocky natural slopes affects the safety of its lower engineering slopes. The local stability of ultra-high and steep rocky natural slopes is also prominent. Under the action of natural factors such as unloading, weathering and rainfall, rolling stones and falling rocks may occur

[0006] At present, for the prevention and control of ultra-high and steep rock slopes, conventional structures and methods generally only control engineering slopes, and do not systematically consider the mutual interference between the lower engineering slope and the upper natural slope, and the excavation of the lower engineering slope may cause other problems. The upper natural slope is deformed or even unstable, and the local stability of the upper natural slope may affect the safety of the lower engineering slope during construction and operation, and may cause immeasurable losses to personnel, equipment and engineering safety

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