A monitoring method for dam foundation deformation depth

A depth and dam foundation technology, which is applied in the field of dam foundation deformation depth monitoring, to achieve the effect of reducing the drilling process and drilling depth

Active Publication Date: 2015-08-05
POWER CHINA KUNMING ENG CORP LTD
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for monitoring the deformation depth of the dam foundation to solve the difficult problem of monitoring the deformation depth of the high dam foundation

Method used

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  • A monitoring method for dam foundation deformation depth
  • A monitoring method for dam foundation deformation depth
  • A monitoring method for dam foundation deformation depth

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Embodiment

[0023] The No. 22 dam section of an arch dam foundation has three measuring points C4-22-IP-01, C4-22-IP-02, and C4-22-IP-03 to monitor the deformation of the arch dam foundation at different depths. Depth deformation results, the relationship function between nonlinear fitting deformation and dam foundation depth is:

[0024]

[0025] y—the deformation corresponding to different depths, x—the depth from the dam foundation.

[0026] pair function derivative, 22 # The extreme value of the accumulative deformation of the dam section from the measuring point of the foundation surface as the depth increases is y max =9.508810055mm.

[0027] Table 1 The percentage of deformation at different depths of the foundation surface to the total deformation (ymax=9.508810055)

[0028] Foundation depth (m) Deformation (mm) % of total deformation 80 8.611558738 90.564 120 8.891212842 93.505 160 9.037933781 95.048 200 9.128362565 95.999 240 ...

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Abstract

The invention provides a dam foundation deformation depth monitoring method. (1) three inverted plumb line measuring instruments of different depths are vertically and downwards arranged in a dam body observation room arranged at a dam foundation monitoring position, and the plumb line depths are between 10% and 15% of the dam height; (2) through the monitoring results of the inverted plumb lines of different depths on the dam foundation, a calculation model of plumb line depths and deformation is built, so that deformation of different depths of the dam foundation is calculated, and the theoretical maximum deformation of the dam foundation is calculated at the same time; (3) the ratio between the deformation of different depths of the dam foundation and the theoretical maximum deformation of the dam foundation is calculated, and when the ratio reaches 98%, the corresponding depth is the deformation depth of the dam foundation. The inverted plumb lines of different depths are arranged on the dam foundation, the calculation model of the plumb line depth and the deformation is built, and therefore the deformation depth of the dam foundation is calculated, and the problem that an instrument and method for monitoring dam foundation deformation depth do not exist is solved.

Description

technical field [0001] The invention relates to the technical field of hydropower engineering, in particular to a method for monitoring the deformation depth of a dam foundation. Background technique [0002] In recent years, my country's hydropower development has been particularly rapid. A number of high dams represented by the Three Gorges Dam (dam height 181m), Jinsha River Xiluodu Arch Dam (dam height 285.5m), Lancang River Xiaowan Arch Dam (dam height 294.5m), etc. Large dams are being built one after another. With the continuous increase of dam height and water load, more and more attention is paid to the depth of action of the load generated by the dam impoundment on the dam foundation, that is, the deformation depth of the dam foundation. [0003] According to the finite element calculation results, the deformation depth of the dam foundation is 2 to 3 times the height of the dam. For 200m or even 300m high dams, the depth of action can reach 600 to 1000m. Therefore,...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D33/00
Inventor 张礼兵赵志勇胡灵芝谭志伟杨姗姗许后磊冯燕明汪国斌
Owner POWER CHINA KUNMING ENG CORP LTD
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