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Excavation relaxation treatment method for rock mass dam foundation with multi-layered structure

A multi-layer structure, excavation relaxation technology, applied in the direction of excavation, infrastructure engineering, construction, etc., can solve the problems of low construction efficiency and difficult to control the excavation quality of the upper rock mass, so as to improve the construction efficiency and improve the excavation molding. Effects, effects of controlling relaxation and damage

Active Publication Date: 2019-05-21
CHINA THREE GORGES PROJECTS DEV CO LTD +1
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems of difficult control of rock mass excavation quality and low construction efficiency in traditional excavation technology, the present invention provides a dam foundation excavation based on structural surface pre-reinforcement, pre-consolidation grouting, diffuse energy blasting and hole bottom initiation. Relaxation technology

Method used

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  • Excavation relaxation treatment method for rock mass dam foundation with multi-layered structure
  • Excavation relaxation treatment method for rock mass dam foundation with multi-layered structure
  • Excavation relaxation treatment method for rock mass dam foundation with multi-layered structure

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Effect test

Embodiment 1

[0033] see Figure 1-4 A method for treating relaxation of a multi-layer structure rock mass dam foundation excavation comprises the following steps:

[0034] Step1: Excavate to the top surface of the protective layer 2: From top to bottom, excavate in layered steps to the elevation of the top surface of the protective layer 2 of the reserved protective layer 3, where the thickness of the reserved protective layer 3 is 3~5m;

[0035] Step2: Pre-reinforce the structural surface 1: judge the development of the internal structural surface of the dam foundation retained rock mass 9 according to the survey data, judge whether there is a long and large structural surface, and use the anchor rod 11 to retain the dam foundation below the reserved protective layer 3 The rock mass 9 is anchored in advance;

[0036] Step3: Pre-consolidation grouting for the retained rock mass 9 of the dam foundation: after the pre-reinforcement of the bolt 11 is completed, perform pre-consolidation grou...

Embodiment 2

[0047] The excavation of the dam foundation of a water conservancy and hydropower project adopts the above-mentioned relaxation treatment method for the excavation of the multi-layer structure rock mass dam foundation. From top to bottom, there are 4 layers of rock formations, the reserved protective layer 3 is columnar joint basalt, and downwards are distributed successively with breccia lava, columnar joint basalt, and oblique porphyry basalt. According to the technical requirements of dam foundation excavation, a layer of protective layer is reserved for blasting excavation, and the thickness of the protective layer is 5m; the existing structural surface 1 is pre-reinforced, and the bolt is vertical to the structural surface, and the reserved protective layer for blasting is proposed The inside is a hollow hole, and the anchor rod only reinforces the rock mass retained on the foundation surface. After the anchoring is completed, basalt fiber mortar concrete is used for pre-...

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Abstract

The invention provides an excavation relaxation treatment method for a rock mass dam foundation with a multi-layered structure. The excavation relaxation treatment method adopts an optimal dam foundation excavation relaxation treatment technology based on ways of structural surface pre-reinforcement, advanced consolidation grouting, energy-dispersive blasting and hole-bottom detonation. Compared with a traditional protective layer stratified excavation method, the relaxation treatment method has the advantages that excavation on 3 layers needs not to be adopted, so that the construction disturbance is reduced, the construction progress is accelerated, and the construction period is shortened; and the excavation relaxation and damage control problems of a rock mass with a multi-layered structure are effectively controlled.

Description

technical field [0001] The invention belongs to the technical field of blasting and excavation of complex rock mass, in particular to a method for treating the relaxation of multi-layer structure rock mass dam foundation excavation. Background technique [0002] As an efficient and economical construction technology, engineering blasting is widely used in the construction of water conservancy, mining, and transportation projects, especially in the blasting and excavation of rock masses such as tunnels, slopes, and dam foundations. [0003] During the blasting and excavation of rock mass, due to the effect of blast load, dynamic damage to the retained rock mass will inevitably occur while the rock blasting is completed. At the same time, complex rock mass, especially multi-layer structure rock mass, will also aggravate this effect; pretreatment measures during construction, blasting excavation methods, and charging network parameters will all affect the relaxation and impact ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F42D1/00F42D3/04E02D17/00E02D3/12
Inventor 杨支跃严鹏周孟夏刘晓高世奎高启栋罗贯军刘春风
Owner CHINA THREE GORGES PROJECTS DEV CO LTD
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