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Construction method of tunnel crossing underneath passing of near karst cave underground river

A construction method and technology of underground rivers, applied in tunnels, earthwork drilling, tunnel lining, etc., can solve problems such as the inability to effectively solve the safety problems of underground rivers passing through karst caves, achieve enhanced crossing effects, increase disposal distances, and ensure construction Effects on Safety and Reliability

Active Publication Date: 2021-01-29
浙江省水利水电勘测设计院有限责任公司
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AI Technical Summary

Problems solved by technology

This method can effectively avoid the phenomenon of water and mud inrush that may occur in the process of underground river treatment, and ensure the safety and reliability of construction and operation. , this method cannot effectively solve the safety problem of underground rivers passing through karst caves

Method used

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  • Construction method of tunnel crossing underneath passing of near karst cave underground river
  • Construction method of tunnel crossing underneath passing of near karst cave underground river
  • Construction method of tunnel crossing underneath passing of near karst cave underground river

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Embodiment Construction

[0023] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0024] Such as Figure 1 ~ Figure 4 Shown, the present invention a kind of construction method that the tunnel crosses and passes down and approaches the underground river of the karst cave, its steps are as follows:

[0025] S1. Organize survey and survey personnel to conduct a detailed survey of the cave hall 2 and the underground river 2a through the manhole 4, and combine the results of the advanced geological forecast to obtain the approximate coordinates along the course of the cave hall 2 and the underground river 2a, the bottom plate of the cave and the size of the cave body section and other information. Use face concrete 3, karst cave backfill concrete 3a, top arch sandbags 5, and top arch steel arch 6 to reinforce the cave section near the underground river 2a of the karst cave to ensure construction safety.

[0026] S2. The origi...

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Abstract

The invention discloses a construction method of a tunnel crossing underneath passing of a near karst cave underground river. The construction method comprises the following steps: S1, measuring datainformation of the karst cave underground river through a manhole, finding out a position relationship between the karst cave underground river and a tunnel face and a to-be-excavated cave section incombination with a geological advanced prediction result, and analyzing related characteristics of the karst cave underground river; and S2, adjusting an originally designed longitudinal slope from the tunnel section behind the tunnel face, increasing the longitudinal slope of the tunnel by deepening the middle space of a bottom plate, meanwhile, adjusting a line deviate by a proper angle and direction on the plane, and reducing the intersection length of the front tunnel and the karst cave underground river. and S3, after tunnel rerouting, carrying out strong support crossing underneath passing of the karst cave underground river. According to the construction method, the karst cave passing effect of the tunnel is enhanced in a vertical face and plane combined space avoiding mode, an original underground river water system is not changed, a construction working face is located on a supported cave section, construction safety is guaranteed, and the method is suitable for tunnel crossing underneath passing of the near karst cave underground river.

Description

technical field [0001] The invention relates to a construction method for crossing karst cave underground rivers in tunnel engineering, in particular to an excavation and support construction method for crossing and passing down close to karst cave underground rivers during drilling and blasting construction. Background technique [0002] With the continuous development of water conservancy projects and traffic engineering in my country, during the construction of tunnel projects in karst areas, it is sometimes inevitable to encounter unfavorable geological conditions such as karst fault fracture zones and karst cave underground rivers, which bring huge hidden dangers to construction safety and seriously affect Construction Schedule. [0003] The basic treatment methods for karst geological problems in tunnels can be summarized into four methods: "direction, blocking, spanning, and circumvention". "Direction" refers to the use of aqueducts, culverts, etc. It is suitable to u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/14E21D11/04E21D11/10E21D11/18
CPCE21D9/14E21D11/105E21D11/04E21D11/18Y02E10/20
Inventor 张宇弛赖勇王子健
Owner 浙江省水利水电勘测设计院有限责任公司
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