Method and system for determining earthquake liquefaction index

A technology of liquefaction index and determination method, which is applied in the direction of design optimization/simulation, and can solve problems such as difficult to judge, error-prone, and complex

Active Publication Date: 2020-07-03
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, the current method for determining the liquefaction index is relatively complicated, and there are too many parameters, especially when the standard penetration test point is not a point in the soil layer, the parameters are difficult to determine and the calculation amount is particularly large, which is prone to errors
And the parameter d in the routine calculation of liquefaction index i and W i It is difficult to judge, and the calculation is error-prone, which is not convenient for practical application in the field

Method used

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  • Method and system for determining earthquake liquefaction index
  • Method and system for determining earthquake liquefaction index
  • Method and system for determining earthquake liquefaction index

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0086] Such as figure 1 As shown, the calculation method of a kind of seismic liquefaction index of the present embodiment comprises the following steps:

[0087] S1. Obtain the depth d of the groundwater table w , and multiple standard penetration test point depths d s and the hammering number N of the corresponding standard penetration test point i .

[0088] The design basic seismic acceleration of a certain site is 0.15g, the design earthquake is grouped into the first group, the groundwater table depth is 2.0m, and the stratum distribution, standard penetration point depth and hammering number are shown in Table 1 below. Calculate the liquefaction index according to the "Code for Seismic Design of Buildings".

[0089] Table 1 Stratum distribution, standard penetration point depth and hammering number

[0090]

[0091]

[0092] According to 4.3.5 of "Code for Seismic Design of Buildings" (GB50011-2010), the basic seismic acceleration of the site design is 0.15g,...

Embodiment 2

[0130] Figure 2 to Figure 5 It is a schematic diagram of determining the upper and lower boundaries of the liquefaction depth with only one standard penetration point in the same soil layer. When there is only one standard penetration experiment point between the upper and lower boundaries of the same soil layer, the upper boundary depth and groundwater level of the soil layer are selected The maximum value of the two depths is used as the upper bound X of the liquefaction depth of the standard penetration test point i-1 ; Select the minimum value of the lower boundary depth and liquefaction depth of the soil layer as the lower boundary X of the liquefaction depth of the standard penetration test point i-2 .

[0131] figure 2 It is a schematic diagram with only one standard penetration point 31 and no influence of water and liquefaction depth. At this time, the upper boundary depth of the soil layer, that is, the depth of the natural formation 1 should be selected as the ...

Embodiment 3

[0136] Figure 6 ~ Figure 9 It is a schematic diagram of determining the upper and lower boundaries of the liquefaction depth with only two standard penetration test points between the upper and lower boundaries of the same soil layer. For the shallower standard penetration test point, the maximum value of the upper boundary depth of the soil layer and the groundwater table depth is selected as the upper limit X of the liquefaction depth of the standard penetration test point i-1 ; The depth of the middle point between the depth of the deeper standard penetration test point and the depth of the shallower standard penetration test point is taken as the lower bound of the liquefaction depth of the standard penetration test point X i-2 ; For the deeper standard penetration test point, the depth of the middle point between the depth of the deeper standard penetration test point and the depth of the shallower standard penetration test point is taken as the upper bound X of the liqu...

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Abstract

The invention relates to an earthquake liquefaction index determination method and system, and belongs to the field of oil field storage and transportation engineering and ground construction. The method comprises the steps that the depth dw of the underground water level, the depths ds of a plurality of standard penetration experiment points and the hammering number Ni of the corresponding standard penetration experiment points are obtained, a liquefaction judgment standard penetration hammering number critical value Ncri is calculated, and whether the corresponding standard penetration experiment points are liquefied or not is judged; determining an upper bound Xi-1 and a lower bound Xi-2 of liquefaction depths of all standard penetration experiment points in the liquefaction depth range; and corresponding intermediate variables f (Xi-1) and f (Xi-2); and determining an earthquake liquefaction index IIE according to the hammering number Ni of the plurality of standard penetration experiment points, the liquefaction discrimination standard penetration hammering number critical value Ncri and the intermediate variables f (Xi-1) and f (Xi-2). Parameters involved in calculation are fundamentally changed, the adopted calculation method is more beneficial to programming, and in other words, after needed data variables are input, a calculation result can be rapidly obtained througha logical operation program. And the calculation of the earthquake liquefaction index is more convenient, quicker and more practical.

Description

technical field [0001] The invention relates to a method and system for determining an earthquake liquefaction index, belonging to the fields of oil field storage and transportation engineering and ground construction. Background technique [0002] Earthquake liquefaction refers to the action of saturated silt or sand particles remaining in suspension under the action of earthquake vibration, resulting in failure of the foundation. The main research contents of earthquake liquefaction are: (1) to study the ground collapse, sand emission, subsidence, floating, etc. during severe earthquakes; (2) to take soil from the construction site, and then analyze the liquefaction process of sandy soil. [0003] Under the influence of violent vibration, the pore water pressure in the sand will continue to increase, and will gradually accumulate to reduce the effective pressure. When the residual pore water pressure is equal to the total pressure, the sand will be "completely liquefied". ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20
Inventor 杨美纯郭志广
Owner PETROCHINA CO LTD
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