Giant-span underground cave depot reserved double-rock-pillar support eight-part excavation construction method
A construction method and cavern technology, applied in underground chambers, earthwork drilling, wellbore lining, etc., can solve the problems of no technical standard construction technology, no successful case projects, and high economic costs, so as to achieve spacious construction space and ensure surrounding rock stability and high operating efficiency
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[0028] According to a giant across underground cave, a double-rock column supports eight excavation construction methods for use in hard surrounding rock formation spans more than 70m, but less than 75m giant across underground calendering project, and the surrounding rock belongs to II Or level III, ie [BQ] is between 400 ~ 550; applicable cave section: straight wall archless free arch flat section, the height of the side wall does not exceed 10m, the height does not exceed 10m; requires the ground water level The cave floor is below the floor.
[0029] In the construction, the opening of the opening surface is partitioned. figure 1 with figure 2 As shown, the opening surface of the cave is vertically up and down, and the portion of the arch line is from the upper part of the construction area, and the following part is the lower part of the construction area;
[0030] In the upper part of the construction zone, the central region is set to the first portion 1, and the portion of...
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