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Method for acquiring density of rock fill object by using additive mass method and digital template chart

An additional mass method and rockfill technology, applied in the direction of measuring devices, specific gravity measurement, instruments, etc., can solve problems such as conflicts and inappropriateness of calibration coefficients, and achieve the effects of improving accuracy, saving engineering funds, and reducing quantities

Active Publication Date: 2013-02-06
CHANGJIANG SURVEY PLANNING DESIGN & RES +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this method are: ① a large number of comparative measuring points are needed to establish a complete calibration coefficient matrix; ② due to the complexity of dam materials and the diversity of construction parameters, this calibration method often leads to a gap between the calibration coefficients. Conflict occurs, that is, the calibration coefficient of a certain dam material and construction parameters is applied to the test results of another dam material and construction parameters, and the calculation is appropriate or not; ③ Reverse calculation to obtain the density value of the additional mass method test Only through point-to-point correspondence

Method used

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  • Method for acquiring density of rock fill object by using additive mass method and digital template chart
  • Method for acquiring density of rock fill object by using additive mass method and digital template chart
  • Method for acquiring density of rock fill object by using additive mass method and digital template chart

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] Select a measuring point at the test site to collect with the additional mass method, and obtain the rockfill mass M 0 =510(kg) and foundation dynamic stiffness K=127.6(MN / m). Excavate a pit at the measuring point, and weigh the mass M of the excavated rockfill with a scale 堆 , deploy impermeable plastics in the pit for irrigation, and calculate the volume of irrigation, and calculate the wet density ρ of the rockfill body according to the formula ρ=M / V 湿 =2.260×10 3 kg.m -3 , dry the excavated rockfill body to obtain the dried mass, the difference between the undried mass and the dried mass is the water content M in the rockfill body 水 , according to the formula η=M 水 / M 堆 =1.5(%) to calculate the water content, so as to obtain the dry density ρ of the rockfill body 干 = ρ 湿 ×(1-η)=2.23×10 3 kg.m -3 . The vibration volume V is obtained from the formula ρ=M / V 0 = M 0 / ρ 湿 =225.66372(m 3 ).

[0084] Similarly, the comparison work of other 24 measuring point...

Embodiment 2

[0093] Embodiment 2 Expansion of digital quantity board

[0094] Measurement of Participatory Vibration Mass M of Foundation Rockfill by Using Added Mass Method 0 =247kg and foundation dynamic stiffness K=69 (MN / m). The test pit method is carried out at the points measured by the additional mass method, and the wet density ρ of the foundation rockfill body points is obtained by digging pits, sampling, weighing, and measuring volume. 湿 =1.98×10 3 kg.m -3 , dry density ρ 干 =1.94×10 3 kg.m -3 And moisture content η=1.8%. Calculate the volume V of the vibration body 0 = M 0 / ρ 湿 = 247 / 1.98 = 124.75m 3 . Use the formula to calculate the natural angular frequency ω -2 = M 0 / K, establish data sample K, ω -2 , V 0 , η, and add the new data sample to the sample collection of the digital quantity board. Correct the accuracy of the sample collection, re-establish the triangular network, perform contour tracking and gridding, and form a new digital measurement panel.

[...

Embodiment 3

[0100] Embodiment 3 Portability of method results

[0101] Using the same test parameters of the Nuozhadu Hydropower Station, the foundation dynamic stiffness K and the vibration mass M 0 The amount of plate 1 in different characteristics of the dam material (such as Figure 6 ), measuring plate 2 (such as Figure 7 ), where the sample (K, M 0 ) is within the calculation range of the measuring plate, the calculated data list is as follows:

[0102] Table 5 Create an expanded volume plate

[0103] K

[0104] Table 6 Organized data table

[0105] Quantitative plate-calculated density

[0106] as attached Figure 8 As shown, the linear regression equation is: y=0.8725x+0.3158 obtained by the least square regression analysis. That is, the density value calculated by measuring plate 1 is x, and the result y calculated by using the regression equation is approximate to the density value calculated by measuring plate 2, thereby realizing the relationship b...

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Abstract

The invention provides a method for acquiring density of a rock fill object by using an additive mass method and a digital template chart. The method comprises the following steps: randomly choosing a set of basic measuring points from the rock fill object; performing the additive mass method test and the pit measuring method test on each measuring point and establishing the digital template chart; at different points of the same rock fill object, calculating a natural vibration angular frequency Omega-2 by utilizing a mass of vibration m0 and a dynamic stiffness K acquired by using the additive mass method test; searching for the corresponding volume of vibration V0 from the digital template chart and a moisture content eta 2 on the template chart, by utilizing the K and the Omega-2; and acquiring the density according to a formula. The template chart can be continuously revised and the revised result is continuously converged, thereby increasing the precision of calculating the density of a rock fill object. The method has portability or applicability and can be applied to other engineering, thereby reducing the quantity of pit measuring method and saving the engineering cost.

Description

technical field [0001] The invention relates to a method for calculating the density of a rockfill body with a digital measuring board of the added mass method. Specifically, a data sample set is established on the rockfill body based on the comparison values ​​of the added mass method test and the pit test method test of a group of basic measuring points and the In the plane coordinate system, the established data sample set is triangularized and isoline traced to obtain the digital quantity plate, and the method of calculating the density of the rockfill body by using the established digital quantity plate at different points of the same rockfill body , belonging to the technical field of exploration geophysics. Background technique [0002] The compacted dry density of a rockfill dam project is an important indicator of project quality control. For the density test method of coarse rockfill soil with a maximum particle size equal to or less than 300mm, the Ministry of Wa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N9/02
Inventor 张建清沈嗣元李盛青张智蔡加兴马圣敏傅萌谷涛杨佐斌李小联朱启贤陆二男刘方文刘润泽吴刚唐培武杨汉良胡志虎喻维钢张志杰文志祥况碧波
Owner CHANGJIANG SURVEY PLANNING DESIGN & RES
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