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Double-tube inner tube method for determining consolidation coefficient and deformation hysteresis index of aquitard in situ

A technology of weakly permeable layer and deformation lag, applied in the field to determine the water release rate, conductivity coefficient and permeability coefficient of the aquitard layer, it can solve the problems of coincidence and the calculated values ​​are too large in different degrees, so as to overcome the error of the test and the experimental process. Simple, analytically rigorous results

Active Publication Date: 2017-05-17
HOHAI UNIV
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  • Description
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  • Application Information

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Problems solved by technology

③The prediction and calculation of soil settlement deformation based on the existing seepage-consolidation model is difficult to match the actual observation results, and the calculated values ​​are often too large to varying degrees

Method used

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  • Double-tube inner tube method for determining consolidation coefficient and deformation hysteresis index of aquitard in situ
  • Double-tube inner tube method for determining consolidation coefficient and deformation hysteresis index of aquitard in situ
  • Double-tube inner tube method for determining consolidation coefficient and deformation hysteresis index of aquitard in situ

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Experimental program
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Effect test

Embodiment

[0098]Make the S(t)~t measured curve in the double-logarithmic coordinate system for the cumulative settlement change with time in Table 1 ( Figure 4 middle dot) and The standard curve (solid line in the figure) is wired so that the two curves overlap (such as Figure 4 ), choose a matching point, and write down the corresponding coordinate value [S]=3.16, and [t]=62, substituting into formula (7), (5), (8) to get

[0099]

[0100] Water release rate:

[0101]

[0102] Consolidation coefficient:

[0103]

[0104] Known average void ratio e=0.861, porosity

[0105]

[0106] Conductivity coefficient:

[0107]

[0108] Permeability coefficient: K=μ s a=6.58×10 -2 ×0.17=1.12×10 -2 (m / d)

[0109] Deformation Hysteresis Index:

[0110] Table 1 Deformation observation data

[0111]

[0112]

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Abstract

The invention discloses a double-tube inner tube method for determining a consolidation coefficient and a deformation hysteresis index of an aquitard in situ. Firstly, a double-tube test model for determining the consolidation coefficient and the deformation hysteresis index of the aquitard by adopting the double-tube inner tube method is formed on site; based on the double-tube test model, a settling volume formula analytic solution of an inner tube aquitard under the conditions that a water head of an outer tube is reduced by a certain constant and an underground water level of one side of a cylinder of the inner tube aquitard is kept unchanged is derived; secondly, according to experimental data that a settling volume of the aquitard in an inner tube is changed along with time, which is measured on the basis of a dial indicator arranged in the inner tube aquitard, the consolidation coefficient and the deformation hysteresis index of the aquitard are determined by adopting a curve fitting method. The double-tube inner tube method disclosed by the invention has the following advantages that the derived analytic solution is strict in theory; in-situ testing on the consolidation coefficient and the deformation hysteresis index of the aquitard is implemented; a testing apparatus and a testing process are simple and easy for operation; a water releasing rate, the consolidation coefficient, the deformation hysteresis index, a conductivity coefficient and a permeability coefficient of the aquitard can be simultaneously obtained, and multiple parameters are acquired.

Description

technical field [0001] The invention relates to a double-pipe-in-pipe method for determining the consolidation coefficient and deformation hysteresis index of an aquitard in situ, in particular to a method for determining the water release rate, conductivity coefficient and permeability coefficient of an aquitard on site. Background technique [0002] The water release deformation of the aquifer system is the most direct cause of regional land subsidence. Land subsidence is an environmental geological phenomenon in which the ground elevation slowly decreases. It is an irreparable permanent loss of environment and resources, and it will develop into a geological disaster in severe cases. From the perspective of hydrogeology, deep overburden is the most typical aquifer system. For example, the deep overburden of the Yangtze River Delta in China is an aquifer system consisting of three confined aquifers and four impervious layers, with a thickness of 50-200 m. In the Yangtze ...

Claims

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Application Information

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IPC IPC(8): G01N15/08
CPCG01N15/08
Inventor 周志芳郑虎赵燕容郭巧娜
Owner HOHAI UNIV
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