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Construction structure and method of core soil reserved for micro-steps in shallow-buried bias-pressure tunnels under phyllite geology

A technology of reserving core soil and construction methods, applied in tunnels, earthwork drilling, tunnel lining, etc., can solve problems such as long continuous deformation time, loose rock mass, uneven softness and hardness of surrounding rocks, and avoid disturbing the strength of surrounding rocks Effect

Active Publication Date: 2021-05-14
CHINA RAILWAY 14TH CONSTR BUREAU GRP 4TH ENG
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the particularity of the tunnel’s shallow buried bias pressure and phyllite lithology, especially the uneven softness and hardness of the surrounding rock at the tunnel face, the surrounding rock changes quickly, the self-stabilization ability and completion are extremely poor, and the continuous deformation time is long; Due to the influence of expansibility and groundwater, the surrounding rock is prone to plastic deformation, the dense rock mass becomes loose, and accelerated deformation leads to landslides, etc.

Method used

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  • Construction structure and method of core soil reserved for micro-steps in shallow-buried bias-pressure tunnels under phyllite geology
  • Construction structure and method of core soil reserved for micro-steps in shallow-buried bias-pressure tunnels under phyllite geology
  • Construction structure and method of core soil reserved for micro-steps in shallow-buried bias-pressure tunnels under phyllite geology

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Embodiment Construction

[0042] In order to make the purpose, features and advantages of the present invention more obvious and understandable, the technical solutions protected by the present invention will be clearly and completely described below using specific embodiments and accompanying drawings. Obviously, the implementation described below Examples are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in this patent, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this patent.

[0043] It will be understood that when an element or layer is referred to as being "on," "connected" or "coupled" to another element or layer, it may be directly on, connected to, or directly on the other element or layer. Or coupled to said another element or layer, intervening elements or layers may also be present. In contrast, when an element is referred to as being "directly on," "di...

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Abstract

The invention provides a construction structure and method for core soil reserved for micro-steps of shallow-buried bias-pressure tunnels under phyllite geology, and uses backfilling, compaction and back-excavation to carry out the construction of turning the open hole into a dark hole; excavate the upper step, and carry out the steel frame arch foot Support; excavate the core soil area and install a temporary inverted arch; excavate the first middle step; excavate the second middle step; set a concrete support layer on the middle step and form a closed ring; excavate the first The lower step is supported by steel arches; the second lower step is excavated and supported by steel arches; the inverted arch is excavated and supported by steel arches; concrete is poured for the inverted arch ; Carry out waterproof layer construction on the main body of the tunnel; carry out lining reinforcement binding and concrete pouring. Avoid long-term disturbance of the hole, causing problems such as ground cracking. To prevent the primary support from intruding into the secondary lining boundary and traction landslides, pre-splitting blasting and milling machines are used to cooperate with construction during excavation to avoid disturbing the strength of the surrounding rock.

Description

technical field [0001] The invention relates to the technical field of phyllite weak surrounding rock geological construction, in particular to a construction structure and method for core soil reserved for micro-steps of shallow-buried bias-pressure tunnels under phyllite geology. Background technique [0002] With the rapid development of expressway construction in recent years, it is inevitable to encounter tunnel projects with special geology and topography, especially tunnel projects with phyllite geology. The tunnel area is a low-mountain landform of structural denudation, and the overall terrain of the passing area has large fluctuations, so there are many cases of shallow burial and bias pressure when the tunnel enters the hole. [0003] The main components of phyllite weak surrounding rock are quartz, chlorite and sericite. When the water content is high, it is lumpy, and when the water content is low, it is scaly. Broken and soft, the surrounding rock has poor sel...

Claims

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Application Information

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IPC IPC(8): E21D11/10E21D11/18E21D19/04
CPCE21D11/10E21D11/18E21D19/04
Inventor 李树敬
Owner CHINA RAILWAY 14TH CONSTR BUREAU GRP 4TH ENG
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