Excavation construction method for weak disturbed belt at foundation of super-high arch dam

Abstract

The invention relates to an excavation construction method for a weak disturbed belt at a foundation of a super-high arch dam, and aims to anchor deep parts of the weak disturbed belt in advance, control the shear deformation, enable the foundation excavation to be carried out in order, and guarantee the project quality and period through exposing the ordered combination application of reinforcement measures and bench excavation during the former excavation process of the weak disturbed belt. The technical scheme lies in that the excavation construction method for the weak disturbed belt at the foundation of the super-high arch dam is characterized by comprising the steps of firstly, determining the relationship between a shear deformation value of the weak disturbed belt and top covering rockmass excavation according to a finite element analysis result; when excavating to the parts at the starting and ending elevations of the deep part anchoring, controlling the bench anchor rope construction to end, removing reserved rock ballast of a next bench through excavation, and carrying out excavation of rockmass at the front edge of the next bench; and carrying out synchronous circulation falling till the weak disturbed belt is exposed through excavation while all anchor ropes are anchored. The excavation construction method is applicable to the super-high arch dam of which the dam foundation has the weak disturbed belt.

Description

technical field [0001] The invention relates to an excavation construction method for a weak and dislocation zone of an extra-high arch dam foundation. It is suitable for extra-high arch dams with weak dislocation zones in the dam foundation. Background technique [0002] With the rapid development of my country's "high dam and large reservoir" project, extra-high arch dams (dam height greater than 200m) will be used as one of the water-retaining structures in the western canyon area. The foundation stress of extra-high arch dams is relatively high, and the requirements for the foundation rock mass are relatively high, and the foundation excavation depth is relatively deep (horizontal and vertical depths are often greater than 100m). However, the conditions of the rock mass in the western canyon area are complex, and there are often weak dislocation zones with low mechanical parameters in the dam foundation. The internal stress is released, and it is easy to cause the shea...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide an excavation construction method for the weak dislocation zone of the foundation of an extra-high arch dam in view of the problems existing in the above-mentioned remedial measures. Carry out the orderly combination of reinforcement measures and excavation steps, carry out deep anchorage to the weak dislocation zone in advance and control its shear deformation, so that the foundation excavation can be carried out in an orderly manner, and the project quality and construction period can be guaranteed

Images