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Supporting method for construction of high-ground-stress weak broken surrounding rock large-section tunnel intersection

A technology for crushing surrounding rock and high ground stress, which is applied in tunnels, tunnel linings, underground chambers, etc., and can solve problems such as large concentrated stress and difficulties in design and construction

Active Publication Date: 2020-08-07
CHINA UNIV OF MINING & TECH (BEIJING) +1
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  • Abstract
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Problems solved by technology

The construction method adopts the three-step construction method, "big bag method" and "small bag method". The concentrated stress near the intersection is too large, which poses a major challenge to the support design and construction of the intersection. encountered great difficulties

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  • Supporting method for construction of high-ground-stress weak broken surrounding rock large-section tunnel intersection
  • Supporting method for construction of high-ground-stress weak broken surrounding rock large-section tunnel intersection
  • Supporting method for construction of high-ground-stress weak broken surrounding rock large-section tunnel intersection

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Embodiment Construction

[0063] The technical solutions in the embodiments of the present invention will be clearly and completely described below, obviously, the described embodiments are only some of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments of the present invention belong to the protection scope of the present invention.

[0064] In the description of the present invention, the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", " The orientations or positional relationships indicated by "top", "bottom", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation, so they cannot be understood as Limitations on the Inven...

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Abstract

The invention provides a supporting method for construction of a high-ground-stress weak broken surrounding rock large-section tunnel intersection. According to the supporting method, through pilot tunnel construction, surrounding rock deformation energy is effectively released, and surrounding rock deformation is controlled advantageously; constant-resistance large-deformation anchor cables can achieve constant-resistance sliding under the action of high pretightening force, the deformation energy of surrounding rock is evenly released, and the structural stability of a supporting body is effectively protected; an active supporting mode is adopted, reverse constraining force can be applied to the surrounding rock in time, the bidirectional stress state of the excavated surrounding rock isrestored to the three-direction stress state, the broken surrounding rock can be improved into a combined arch with the uniform bearing force through the constant-resistance large-deformation anchorcables, the friction force between the surrounding rock is increased through the high pretightening force of the constant-resistance large-deformation anchor cables, and the anti-shearing capacity ofa bearing arch is improved; and the surrounding rock can be suspended on a deep stable rock stratum through the suspension theory, the reinforced combined arch is formed through joint supporting of the long anchor cables and the short anchor cables, and large deformation of the soft rock surrounding rock is resisted jointly.

Description

technical field [0001] The invention belongs to the technical field of tunnel intersection construction and support, and in particular relates to a support method for the construction of large-section tunnel intersections in weak and broken surrounding rocks with high ground stress. Background technique [0002] With the continuation of the western development strategy, the construction of railways and highways in the western region has developed rapidly. Due to the mountainous landforms in the western region, the construction of mountain tunnels has become a shortcut to reduce the distance of traffic lines. Under the influence of complex geological conditions in the western region, a variety of construction and geological problems that are different from traditional tunnels in the central and eastern regions inevitably appeared during the tunnel construction process. The construction of high geostress soft rock tunnel intersections is one of them. When constructing an ultr...

Claims

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Application Information

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IPC IPC(8): E21D9/00E21D11/15E21D20/02E21D11/18E21D11/38E21D11/10E21D15/02
CPCE21D9/00E21D11/10E21D11/152E21D11/155E21D11/18E21D11/38E21D15/02E21D20/025
Inventor 陶志刚乔小兵王丰年何满潮米蒙范晋琰罗森林
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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