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Prediction method of flood peak value and peak time of storm water inrush from underground river in karst tunnel

A technology of peak time and prediction method, which is applied in prediction, climate change adaptation, data processing application, etc., to achieve the effect of convenient calculation, safe construction operation and simple structure

Active Publication Date: 2017-03-08
CHINA RAILWAY SIYUAN SURVEY & DESIGN GRP
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Problems solved by technology

However, when the traditional hydrogeological tunnel water inflow prediction method is used to realize the peak value and peak time of karst tunnel water inflow, there are challenges in terms of theory, method and technical means.

Method used

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  • Prediction method of flood peak value and peak time of storm water inrush from underground river in karst tunnel
  • Prediction method of flood peak value and peak time of storm water inrush from underground river in karst tunnel
  • Prediction method of flood peak value and peak time of storm water inrush from underground river in karst tunnel

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Embodiment Construction

[0024] Embodiments of the present invention will now be described with reference to the drawings, in which like reference numerals represent like elements.

[0025] refer to figure 1 In this embodiment, the method for predicting the peak value and peak time of the flood peak and peak time of the karst tunnel underground river storm water inrush includes the following steps:

[0026] Step S1, according to the formula Calculate the point rainfall, where, is the mean value of point rainstorm in 1, 6, and 24 hours, k p is the modulus ratio coefficient of the Pearson type III frequency curve;

[0027] Step S2, calculate the watershed area of ​​the watershed near the karst tunnel according to the ratio of 1:5000 according to the topographic map;

[0028] Step S3, when the watershed area 2 when H t面 =H t点 , where H t面 is surface rainfall;

[0029] When the drainage area is ≥ 25km 2 And when 10 minutes ≤ t<60 minutes,

[0030]

[0031] When the drainage area is ≥ 25km ...

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Abstract

The invention discloses a method for forecasting water burst flood peak and peak time for a karst tunnel underground river. The method comprises the following steps: (1) computing point rainfall; (2) determining areal rainfall according to the point rainfall; (3) computing effective precipitation according to the areal rainfall; (4) computing time interval unit hydrograph; (5) computing effective precipitation unit hydrograph according to the time interval unit hydrograph; (6) computing surface runoff according to the effective precipitation and the effective precipitation unit hydrograph; (7) computing subsurface runoff; (8) adding the surface runoff at each time interval and the subsurface runoff at the corresponding time intervals to obtain flood discharge; (9) performing fitting on value of the flood discharge to obtain a flood hygrograph; and (10) obtaining the flood peak and the corresponding peak time on the flood hygrograph and determining construction time for a karst tunnel according to the flood peak and the corresponding peak time. According to the method provided by the invention, the water burst flood peak in the tunnel and the arrival time of the flood peak can be accurately forecasted, so that the construction time for the tunnel can be reasonably arranged, and the lives of people and the safety of mechanical equipment can be ensured.

Description

technical field [0001] The invention relates to the field of rainstorm runoff process in an underground karst tunnel underground river and early warning of water gushing, in particular to a method for predicting the peak value and peak time of storm water gushing flood peak in a karst tunnel underground river. Background technique [0002] During the construction of railway tunnels, karst underground river systems are usually encountered. The karst underground river system is usually dominated by karst caves and other karst interstitial media bodies. Its morphological structure has certain similarities with surface rivers, which conforms to the development, formation and evolution of surface water systems. The dynamic change characteristics of underground river flow and surface water flow They also have very good similarities, both of which have the characteristics of large flow, fast flow, and the flood peak can be completed within a few hours. During the construction of t...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06Q10/04
CPCY02A10/40
Inventor 汪继锋顾湘生刘坡拉曹柏树曾强运黄新连邬强姚建伟徐红星陈爱云
Owner CHINA RAILWAY SIYUAN SURVEY & DESIGN GRP
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