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

A construction method and a technology of staggered belts, which are applied in basic structure engineering, excavation, construction, etc., to achieve the effect of improving stability

Active Publication Date: 2016-09-28
POWERCHINA HUADONG ENG COPORATION LTD
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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 combin

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

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Embodiment Construction

[0017] This embodiment is a construction method for controlling the shear deformation of the weak dislocation zone following the excavation of the overlying rock mass during the excavation of the foundation of an extra-high arch dam. Such as figure 1 As shown, firstly, according to the finite element analysis results, the relationship between the shear deformation value of the weak dislocation zone 3 and the excavation of the overlying rock mass was determined ( figure 1 Each curve in the figure shows the deformation of the displacement zone at each depth when the dam foundation is excavated to different elevations. Coordinates are shear deformation values). When the excavation reaches the initial elevation of deep anchoring, control the construction of the anchor cable 4 in this step section 101 (deep part), excavate the reserved gravel 5 in the next step section 102 and proceed to the next step section 103 leading edge rock mass 6 Excavation; Such a synchronous circulation...

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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...

Claims

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Application Information

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IPC IPC(8): E02D17/02E02D27/40
CPCE02D17/02E02D27/40
Inventor 张伟狄纪林强徐建荣何世海殷亮祝青顾锦健黄熠辉魏海宁
Owner POWERCHINA HUADONG ENG COPORATION LTD
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