Method for controlling slope excavation rock mass unloading and relaxation

A rock mass and slope technology, applied in the field of rock mass unloading and relaxation control in slope excavation, can solve problems such as large economic losses, endangering personal safety, and affecting the construction period, so as to reduce risks, reduce post-processing workload, and have Economical effect

Inactive Publication Date: 2018-06-15
POWERCHINA CHENGDU ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The various consequences of slope instability not only affect the construction

Method used

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  • Method for controlling slope excavation rock mass unloading and relaxation
  • Method for controlling slope excavation rock mass unloading and relaxation
  • Method for controlling slope excavation rock mass unloading and relaxation

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Experimental program
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Embodiment

[0025] figure 1 It is a schematic diagram of the engineering design excavation line involved in the present invention.

[0026] figure 2 The schematic diagram of the excavation of the reserved ballast layer involved in the present invention. In this embodiment, when excavating the engineering design slope, a ballast layer 2 with a thickness of 3m is reserved on the top of the designed excavation slope 1 for self-stabilization and ballast. At this time, soil deformation occurs near the primary excavation line 5 .

[0027] image 3 It is a schematic diagram of the anchoring of the ballast layer involved in the present invention. In this embodiment, after one excavation is completed, the reserved ballast layer 2 is anchored, and a mortar bolt with a diameter of 22mm is used, and the distance between rows is 3.0m or 4.5m. Plum blossom arrangement. Deep into the surface rock mass. Self-stabilization time is retained after construction.

[0028] Figure 4 It is a schematic d...

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Abstract

The invention relates to a method for controlling slope excavation rock mass unloading and relaxation, and belongs to the technical field of building, hydroelectricity and other engineering construction. The method can effectively control the unstability problem during slope excavation. On the premise of not affecting the time limit for a project, primary stabilization is conducted after excavation by preserving a ballasting layer, secondary stabilization is conducted by anchoring a rock mass through grouted rockbolts, secondary excavation is conducted finally, and the ballasting layer is anchored in the reserved part of a slope toe. The method can effectively guarantee safety and stability of a slope, improves the deformation capacity, fully conducts stress adjustment, lowers the unstability probability of the slope, and achieves the purposes of improving safe stability and economy.

Description

technical field [0001] The invention relates to a method for controlling unloading and loosening of rock mass during side slope excavation, and belongs to the technical fields of engineering construction such as civil engineering and hydropower. Background technique [0002] In the field of civil engineering and hydropower engineering construction, it is often necessary to carry out high-strength excavation on rocky high slopes under complex geology and high ground stress conditions. Changing the shape of the original rock mass will cause changes in the boundary conditions and loads of the rock mass, so that all or part of the stress on the rock mass on the excavation surface will be removed, resulting in a secondary adjustment of the stress and the formation of a large-scale unloaded body. As a result, slope instability and soil deformation problems occur. After the slope is excavated, the deformation is composed of two parts: one is caused by unloading after excavation, a...

Claims

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Application Information

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IPC IPC(8): E02D17/20E02D5/74
CPCE02D17/20E02D5/74
Inventor 杜长劼蒋林魁
Owner POWERCHINA CHENGDU ENG
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