Unsaturated soil hydraulic characteristic parameter numerical value inversion method based on evaporation process

A technology of hydraulic characteristics and soil-water characteristic curves, applied in the fields of electrical digital data processing, CAD numerical modeling, special data processing applications, etc., can solve the problems of difficult convergence, low efficiency, and technical difficulty of moisture absorption process, etc.

Active Publication Date: 2021-09-07
JINLING INST OF TECH
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Problems solved by technology

[0004] However, most of the current numerical inversion methods for the hydraulic characteristic parameters of unsaturated soil are based on the measured data of the moisture absorption process such as rainfall or water infiltration, and the experimental technology of the moisture absorption process is ...

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  • Unsaturated soil hydraulic characteristic parameter numerical value inversion method based on evaporation process
  • Unsaturated soil hydraulic characteristic parameter numerical value inversion method based on evaporation process
  • Unsaturated soil hydraulic characteristic parameter numerical value inversion method based on evaporation process

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Embodiment Construction

[0046] The technical solutions of various embodiments of the present invention will be further described below in conjunction with the accompanying drawings, and the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, other embodiments obtained by those skilled in the art without creative efforts all belong to the protection scope of the present invention.

[0047]The invention provides an inversion method for unsaturated soil hydraulic characteristic parameters, which reduces the difficulty of obtaining measured data required for the inversion and improves the efficiency of the inversion while improving the inversion accuracy. The method consists of numerical simulation of the evaporation process Forward analysis and optimization algorithm composition.

[0048] Such as figure 1 As shown, a numerical inversion method for unsaturated soil hydraulic characteristic parameters based o...

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Abstract

An unsaturated soil hydraulic characteristic parameter numerical value inversion method based on an evaporation process comprises the following steps: 1) performing an indoor soil body drying test, monitoring the mass change of a soil body, obtaining an actual evaporation capacity process line of the soil body, and recording related environment variable data; 2) selecting a Fredlund model to fit a hydraulic conductivity and soil-water characteristic curve, wherein model parameters are to-be-inverted parameters; 3) establishing a corresponding finite element analysis model according to the characteristics of a soil sample; 4) calculating the surface evaporation capacity of the soil body according to a migration equation of the gas-liquid two-phase flow under the action of a hydrothermal gradient and a Penman-Wilson formula; 5) determining a target function F (X), wherein the F (X) is the error sum of squares of the actually measured evaporation capacity and the calculated evaporation capacity; 6) according to the target function, using a whale optimization algorithm to invert the parameters of the Fredlund model. According to the method, the inversion precision is improved, meanwhile, the obtaining difficulty of actually measured data needed by inversion is reduced, the inversion efficiency is improved, and the method is composed of numerical simulation evaporation process forward modeling analysis and an optimization algorithm.

Description

technical field [0001] The invention belongs to the field of geotechnical engineering calculations, in particular to a numerical inversion method for unsaturated soil hydraulic characteristic parameters based on evaporation process. Background technique [0002] Most of the soil encountered in geotechnical engineering is in an unsaturated state. Unlike saturated soil, unsaturated soil has three phases of solid, liquid and gas, and its properties are more complex. The most important reason for the transformation of saturated soil into unsaturated soil is the change of water content. In the saturated area, the water content of the soil is a constant value, which is generally called the saturated water content; in the unsaturated area, the water content of the soil is not equal to the matrix suction The linear function is generally called the soil moisture characteristic curve. The change of water content directly affects the stability of rock and soil structure, such as uneve...

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Application Information

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IPC IPC(8): G06F30/23G06F30/27G06F30/28G06F111/10G06F113/08G06F119/14
CPCG06F30/23G06F30/28G06F30/27G06F2111/10G06F2113/08G06F2119/14
Inventor 周桂云
Owner JINLING INST OF TECH
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