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Gravitational dam uplift pressure grading early warning method based on measured data

A technology of measured data and gravity dams, applied in gravity dams, electrical digital data processing, dams, etc., can solve the problems of multi-collinearity, measurement error, lack of physical and engineering foundation, etc., and achieve simple and intuitive physical meaning and judgment Good accuracy and simple calculation

Pending Publication Date: 2020-06-09
NANJING AUTOMATION INST OF WATER CONSERVANCY & HYDROLOGY MINIST OF WATER RESOURCES +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The first two statistical methods do not consider the physical background of uplift pressure changes, nor do they fully consider the upstream and downstream water levels and geological conditions that affect uplift pressure. They are only based on a certain probability assumption and lack physical and engineering foundations.
Although the latter takes into account the influence of independent variable factors, the generalization ability of the model cannot be guaranteed because the linear stepwise regression model is easily affected by measurement error and multicollinearity
[0004] Due to the complexity and non-uniformity of the geological conditions of the actual dam foundation, the measured uplift pressure is significantly different from the linear distribution assumed by the code. If the uplift pressure of each piezometric pipe is alarmed according to the distribution specified in the code, false alarms are likely to occur

Method used

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  • Gravitational dam uplift pressure grading early warning method based on measured data
  • Gravitational dam uplift pressure grading early warning method based on measured data
  • Gravitational dam uplift pressure grading early warning method based on measured data

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Embodiment 1

[0035] Such as figure 1 As shown, a gravity dam uplift pressure classification early warning method based on measured data, the classification early warning method includes the following steps:

[0036] Step 1: Obtain and determine the structure type of the gravity dam; if the gravity dam is a solid gravity dam, the reference design specification is "Specification for Design of Concrete Gravity Dam SL 319-2018" or the design specification optimized by the construction party according to this specification;

[0037] Step 2: judge the position of the dam section;

[0038] Step 3: Obtain the pile number of multiple transverse piezometric tubes set in the dam section, so as to obtain the transverse coordinates of each uplift pressure measuring point;

[0039] Step 4: Read the measured value of the upstream and downstream water level of the gravity dam; read the head value of each piezometer; determine the uplift pressure reduction coefficient α according to the type of gravity da...

Embodiment 2

[0059] In this embodiment, taking the uplift pressure of four general dam foundations as an example, the actual uplift pressure area Mt and the standard uplift pressure area St of the uplift pressure are calculated respectively.

[0060] Such as figure 2 As shown, the distribution of the four piezometric tubes U, T, S, R is as follows figure 2 As shown, the corresponding measured head values ​​of the piezometric tubes are h1(t), h2(t), h3(t) and h4(t); the head of uplift pressure at the upstream is H1(t); The water head acting on the uplift pressure is H2(t).

[0061] The measured uplift pressure load can be obtained by calculating the area of ​​the multi-deformation IJKLMNOP, which is equal to the sum of five four-deformation areas. The five quadrilaterals are IJKU, UKLT, TLMS, SMNR, and RNOP. M2, M3, M4, and M5 are represented by the formula:

[0062] Mt=M1+M2+M3+M4+M5;

[0063] L IU is the distance from point I to point U;

[0064] L UT is the distance from poi...

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Abstract

The invention discloses a gravitational dam uplift pressure grading early warning method based on measured data, which approaches actual uplift pressure distribution through a connecting line of measured uplift pressures of two adjacent points, and comprises the following steps: calculating an actual uplift pressure area Mt and a standard uplift pressure area St; comparing the numerical values ofMt and St, if Mt is larger than or equal to St, giving a blue alarm and executing the next step; calculating vertical normal stress and principal stress at the dam heel and the dam toe according to the actually measured uplift pressure, and if any one of the vertical normal stress and the principal stress exceeds the standard requirement, starting a yellow alarm and carrying out the next step; calculating and judging whether the anti-sliding stability safety coefficient and the anti-overturning stability safety coefficient of the gravity dam exceed the design specification requirements or notaccording to the actual measurement data, and if yes, starting red alarm. Early warning is performed according to uplift pressure actual measurement data in combination with specific gravity dam structures and types, dam structures and geological conditions are fully considered, and the grading early warning method has the advantages of simplicity, intuitiveness, clear physical significance, simple calculation and the like.

Description

technical field [0001] The invention relates to the technical field of dam safety graded early warning methods, in particular to a gravity dam uplift pressure graded early warning method based on measured data. Background technique [0002] Gravity dam is a common water retaining structure, such as my country's Three Gorges Project, etc. are all gravity dams. The safety status of the dam not only affects whether the project investment and benefits can be played normally, but also directly affects the life and property of the downstream people, social stability, national economy and ecological environment safety. Effectively realizing the safety early warning of the gravity dam can effectively avoid the safety of the project. risks, and give full play to engineering benefits. [0003] Uplift pressure is an important load of a gravity dam, an important factor affecting the safety of a gravity dam, and has a very important impact on the stability of the dam and the stress dist...

Claims

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Application Information

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IPC IPC(8): G06F30/13E02B1/00E02B7/10G06F119/14
CPCE02B1/00E02B7/10
Inventor 方卫华
Owner NANJING AUTOMATION INST OF WATER CONSERVANCY & HYDROLOGY MINIST OF WATER RESOURCES
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