CN-121976506-A - Hydraulic tunnel integrating barrier lake flood discharge, sand flushing, emptying and diversion and application method

CN121976506ACN 121976506 ACN121976506 ACN 121976506ACN-121976506-A

Abstract

The invention discloses a hydraulic tunnel integrating flood discharge, sand flushing, emptying and diversion of a barrier lake and an application method, and relates to the technical field of barrier lake discharge, wherein the hydraulic tunnel comprises an existing diversion tunnel, an existing tunnel reconstruction section, a dragon head inclined section, an upper flat section, an emergency flood discharge tunnel, an inlet accident overhaul lock chamber, an outlet working lock chamber section and an outlet flip bucket section; the existing diversion tunnel is modified, a dragon head raising inclined section, an upper flat section, an inlet accident overhaul lock chamber, an emergency flood discharge hole and an outlet working lock chamber section are respectively built at the upstream and downstream of the existing diversion tunnel, an original water passing building and an emergency flood discharge hole are used as main diversion buildings, and the scale and the bottom plate elevation of the surface hole flood discharge building such as a flood discharge hole are determined by combining flood season overflow requirements so as to meet the safety overflow flood in the construction period of a weir plug body, a new tunnel is not additionally built, and the multifunctional hydraulic tunnel integrating flood discharge, sand flushing and air discharge is modified.

Inventors

CHENG KAI
ZHANG ZONGLIANG
ZHANG FAYU
SUN WEI
CAI CHENGYAN
OU GANG
WANG ZHIGANG
ZHANG CHENG
WANG JIN

Assignees

中国电建集团昆明勘测设计研究院有限公司
云南水投牛栏江堰塞湖工程建设有限公司

Dates

Publication Date: 20260505
Application Date: 20260226

Claims (9)

1. The hydraulic tunnel integrating the flood discharge, sand flushing, emptying and diversion of the barrier lake is characterized by comprising an existing diversion tunnel (1), an existing tunnel reconstruction section (2) is arranged in the middle of the existing diversion tunnel (1), a dragon head inclined section (3) and an upper flat section (4) are arranged at the upstream section of the existing tunnel reconstruction section (2), an emergency flood discharge hole (5) is arranged at the downstream section of the existing tunnel reconstruction section (2), an inlet accident overhaul lock chamber (6) communicated with the barrier lake is arranged on the upper flat section (4), an outlet working lock chamber section (7) is arranged at the end of the emergency flood discharge hole (5), and the outlet working lock chamber section (7) is connected with an outlet nose bridge section (8).
2. The hydraulic tunnel integrating the flood discharge, sand flushing, emptying and diversion of the barrier lake as claimed in claim 1 is characterized in that a construction branch hole (10) is arranged between the dragon head-raising inclined section (3) and the entrance accident overhaul lock chamber (6), and a first plug (11) is arranged in the construction branch hole (10).
3. The hydraulic tunnel integrating the flood discharge, sand flushing, emptying and diversion of the barrier lake as claimed in claim 2 is characterized in that a second plug (12) is arranged at the joint of the existing diversion tunnel (1) and the existing tunnel reconstruction section (2).
4. A hydraulic tunnel integrating barrier lake flood discharge, sand flushing, emptying and diversion as claimed in claim 3 is characterized in that a third plug (13) is arranged in the existing diversion tunnel (1) close to the emergency flood discharge tunnel (5).
5. The hydraulic tunnel integrating the flood discharge, sand flushing, emptying and diversion of the barrier lake as claimed in claim 4, wherein the joint of the dragon head inclined section (3) and the existing tunnel reconstruction section (2) is in arc transition.
6. The hydraulic tunnel integrating barrier lake flood discharge, sand flushing, emptying and diversion according to claim 5, wherein the cross section size of the emergency flood discharge tunnel (5) is 7.5m multiplied by 7.5m, the center of a top arch is 120 degrees, the intersection point of the emergency flood discharge tunnel (5) and the existing diversion tunnel (1) is about 25m from the intersection point of the original construction branch tunnel (10) and the existing diversion tunnel (1), and the bottom slope of the existing diversion tunnel (1) is about 2.844%.
7. The hydraulic tunnel integrating flood discharge, sand flushing, emptying and diversion of the barrier lake of claim 6, wherein the height 1208m, the width 5m and the slope ratio of two sides of the barrier body (16) of the barrier lake are excavated at the bottom of the drainage groove, and the ratio of two sides of the drainage groove is 1:1.5.
8. The hydraulic tunnel integrating flood discharge, sand flushing, emptying and diversion of the barrier lake as set forth in claim 7, wherein the inlet pressure tunnel section of the inlet accident overhaul lock chamber (6) consists of a horn mouth section, a gradual change section and a circular tunnel section.
9. A method of using a hydraulic tunnel for discharging, flushing sand, emptying and diversion in one piece in a barrier lake according to any one of claims 1-8, comprising the following steps: The emergency flood discharge of the barrier lake comprises the steps of excavating a flood discharge groove at the top of the barrier body (16), and when the height is more than 1220m, discharging flood by combining the emergency flood discharge hole (5) and the flood discharge groove for 20 years, wherein the emergency flood discharge hole (5) is connected with the existing diversion tunnel (1), so that the outlet elevation of a flood discharge channel is reduced; the method comprises the steps of diversion during development and utilization of a weir plug body (16), namely, after a hydropower station of an existing diversion tunnel (1) takes a dam, piling up engineering excavation waste slag as a dead period cofferdam, utilizing an emergency spillway tunnel (5) which is formed by the existing diversion tunnel (1) +is communicated as a diversion tunnel, adopting a dead period earth-rock cofferdam water retaining and diversion tunnel overflow mode, and adopting a diversion mode of the weir plug body (16) for retaining water, the diversion tunnel and (un) completing spillway tunnel (17) overflow in a flood period; And in the operation period, flood discharge, sand flushing and emptying are carried out by adding a dragon head lifting inclined section (3) and an outlet working lock chamber section (7) by utilizing the existing diversion tunnel (1) and combining an accident maintenance lock chamber and an emergency flood discharge tunnel (5).

Description

Hydraulic tunnel integrating barrier lake flood discharge, sand flushing, emptying and diversion and application method Technical Field The invention relates to the technical field of barrier lake discharge, in particular to a hydraulic tunnel integrating barrier lake flood discharge, sand flushing, emptying and diversion and an application method. Background The landslide blocks the river to form a barrier lake, the emergency disposal means mainly adopts the top of the barrier body to excavate a drainage groove, and for the barrier lake with the emptying condition, the emergency flood drainage tunnel newly built from the downstream can be adopted to rapidly empty the barrier lake, so that the risk of influence of flood on the barrier body and the security of people, property and infrastructure along the two sides of the river from the drainage groove after the flood flows is reduced. And the later period is combined with the development and utilization evaluation of the damming body, and the damming body with higher development and utilization value is developed and utilized to become a regulating reservoir or a green power station, so that the method has good social economy and disaster prevention and reduction benefits. At present, the disposal of domestic barrier lakes mainly excavates emergency spillways, such as Tang Gushan in 2008 and white grid in 2018, and few engineering cases of discharging floods through excavating emergency spillways and transforming the emergency spillways into later-stage spillways, sand flushing, emptying and diversion tunnels are needed, and corresponding design technical achievements are lacked, so that related deepened researches are needed to be carried out urgently. Disclosure of Invention The invention mainly aims to provide a hydraulic tunnel integrating barrier lake flood discharge, sand flushing, emptying and diversion and an application method thereof, which are used for solving the problems in the background technology. The hydraulic tunnel with the integrated functions of flood discharge, sand flushing, emptying and diversion of the barrier lake is provided, the hydraulic tunnel comprises an existing diversion tunnel, an existing tunnel reconstruction section is arranged in the middle of the existing diversion tunnel, a dragon head inclined section and an upper flat section are arranged on the upstream section of the existing tunnel reconstruction section, an emergency flood discharge hole is arranged on the downstream section of the existing tunnel reconstruction section, an inlet accident overhaul lock chamber communicated with the barrier lake is arranged on the upper flat section, an outlet working lock chamber section is arranged at the end of the emergency flood discharge hole, and the outlet working lock chamber section is connected with an outlet flip bucket section. As a further improvement of the invention, a construction branch hole is arranged between the dragon head lifting inclined section and the entrance accident overhaul lock chamber, and a first plug is arranged in the construction branch hole. As a further improvement of the invention, a second plug is arranged at the joint of the existing diversion tunnel and the existing tunnel transformation section. As a further improvement of the invention, a third plug is arranged in the existing diversion tunnel close to the emergency flood discharge tunnel. As a further improvement of the invention, the joint of the dragon head inclined section and the existing tunnel transformation section is in arc transition. As a further improvement of the invention, the section size of the emergency flood discharge hole is 7.5m multiplied by 7.5m, the center of the top arch is 120 degrees, the intersection point of the emergency flood discharge hole and the existing diversion tunnel is about 25m away from the intersection point of the original construction branch hole and the existing diversion tunnel, and the bottom slope of the existing diversion tunnel is about 2.844%. As a further improvement of the invention, the top of the damming body of the damming lake is excavated to have the bottom elevation 1208m, the width 5m and the two-side excavation slope ratio of 1:1.5. As a further improvement of the invention, the inlet pressure hole section of the inlet accident overhaul lock chamber consists of a horn mouth section, a gradual change section and a circular tunnel section. The invention discloses an application method of a hydraulic tunnel integrating flood discharge, sand flushing, emptying and diversion of a barrier lake, which comprises the following steps: The emergency flood discharge of the barrier lake comprises the steps of excavating a flood discharge groove at the top of the barrier body, and when the height is more than 1220m, discharging flood by combining the emergency flood discharge hole and the flood discharge groove for 20 years, wherein the emergency flood discharge hole is connected with an ex