Ring excavation construction method for underground large-span spherical-cap-shaped dome under weak surrounding rock

A construction method and circular excavation technology, which is applied to underground chambers, earthwork drilling, wellbore lining, etc., can solve the problems of inability to guarantee the safety of excavation construction workers and equipment, difficulty in controlling the quality of spherical crown domes, and surrounding weak surroundings. The problems such as large rock disturbance can be solved, and the effect of shortening the exposure time, saving investment, and avoiding the cost of construction measures can be achieved
CN105201532AActive Publication Date: 2015-12-30CHINA RAILWAY NO 9 GRP 2ND ENG
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
CHINA RAILWAY NO 9 GRP 2ND ENG
Publication Date
2015-12-30

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Abstract

The invention discloses a ring excavation construction method for an underground large-span spherical-cap-shaped dome under weak surrounding rock and belongs to the technical field of excavation construction of underground caverns. The method comprises the following six steps: determining the rise-span ratio of the spherical-cap-shaped dome; directly entering the spherical-cap-shaped bottom from an up-leading cavity for forming of a section A; performing first ring excavation support of the spherical-cap-shaped dome; performing next ring excavation support of the spherical-cap-shaped dome; finishing excavation support of a section D in the center of the dome; performing off-wall coating of the spherical-cap-shaped dome. The method is applicable to various surrounding rock geological conditions, has wider application range and a few construction procedures; the scaffold input quantity for coating construction of the spherical-cap-shaped dome is reduced, the construction efficacy is improved, the construction progress is accelerated, the construction cost is saved, the difficult problem about excavation of the underground large-span spherical-cap-shaped dome under complex geological conditions of the weak surrounding rock is solved, personnel and equipment safety during construction operation is guaranteed, disturbance on the peripheral surrounding rock is reduced, and the forming quality of the spherical-cap-shaped dome can be controlled very well.
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Description

technical field

[0001] The invention belongs to the technical field of excavation construction of underground caverns, and in particular relates to an annular excavation construction method for an underground large-span spherical crown dome under weak surrounding rock. Background technique

[0002] With the rapid development of my country's economy, more and more underground projects have entered the planning and construction stage. The large-span spherical crown dome of the underground cavern is a three-dimensional shape, and the design section profile is always changing dynamically, which has high requirements for the control of the section line shape. At present, my country's underground engineering construction methods mainly include full-section method, step method, CD middle partition method, CRD cross middle wall method, double-sided pilot pit method, ring-shaped reserved core soil method, etc. These methods are mostly used in railways, highways, Excavation constructi...

Claims

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