Double-pipe-outside-pipe method for in-situ determination of consolidation coefficient and deformation hysteresis index of aquitard
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 and good effect of promoting application value
Active Publication Date: 2019-06-21
HOHAI UNIV
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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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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 an in-situ double-tube outer tube method for determining an aquitard consolidation coefficient and a deformation lagging index. The method comprises: firstly, forming a double-tube test model for determining the aquitard consolidation coefficient and the deformation lagging index by using the double-tube outer tube method on the scene, deriving to reduce by a certain constant at an inner tube water head on the basis of the double-tube test model, and obtaining an analytic solution by using a settlement formula for outer tube aquitard under the condition that the underground water level remains unchanged at one side of an outer tube aquitard column; secondly, determining the aquitard consolidation coefficient and the deformation lagging index by using a fitting curve method according to experimental data about time-varying outer tube aquitard settlement measured on the basis of a dial indicator arranged in the outer tube aquitard. The method has the advantages that: a derived analytic solution theory is precise; in-situ test for the aquitard consolidation coefficient and the deformation lagging index is realized, and a testing device and a testing process are simple and easy to operate; the water release rate, the consolidation coefficient, the deformation lagging index, the conductivity coefficient and the permeability coefficient of the aquitard can be obtained simultaneously, and more parameters are obtained.
Description
technical field [0001] The invention relates to a double-pipe outer 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 Yangt...
Claims
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IPC IPC(8): G01N15/08
CPCG01N15/08
Inventor 周志芳赵燕容李鸣威郭巧娜
Owner HOHAI UNIV
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