重力勘查工作中基于大样法的松散沉积层密度测定方法的改进

doi:10.11720/wtyht.2021.1386

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Abstract

In the gravity survey, especially in the gravity survey of the Quaternary cover areas, it is of great significance to accurately determine the density of loose sediments for the correction, processing, inversion, interpretation and study of gravity data. For a long time, the density of loose sediments has always been determined by regular bulk sample method in the field of gravity survey. However, it is difficult for this method to obtain a regular sampling pit in field work. Therefore, there is a large error between the volume of sampling pit obtained from the calculation formula of regular shape and the volume of actual sampling pit, which leads to inaccurate measurement of density value of loose sediments. This paper presents a method which is the irregular hexahedron volume calculation method. This method is more suitable for the actual situation in the field, and can improve the traditional regular bulk sample method. This method can determine the density of loose sediments more precisely and raise the working efficiency.

Key words： gravity survey loose sedimentary density determination large sample method irregular hexahedron

Received: 31 July 2020 Published: 01 March 2021

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	Articles by authors
	Tao GENG
	Fan FENG
	Hui DU
	Zhi-Han FENG
	Pei-Hong GUO

Cite this article:

Tao GENG,Fan FENG,Hui DU, et al. The improvement of density measurement method of loose sedimentary based on large sample method in gravity survey[J]. Geophysical and Geochemical Exploration, 2021, 45(1): 165-172.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2021.1386 OR https://www.wutanyuhuatan.com/EN/Y2021/V45/I1/165

Schematic diagram of large sample method

Diagram of difference between actual sampling pit and theoretical sampling pit

The numbering of the corner nodes and the surfaces of a hexahedral element, and the definition of the shape parameters

Degeneration forms of hexahedral elements

Coordinate system used to calculate the volume of tetrahedron

A parallelepiped can be divided into six equal tetrahedrons

Need to measure parameters in field work

The known conditions of irregular quadrilateral and the side length to be calculated

Interface of calculation program for large sample density

Correct method of measuring side length

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