ABSTRACT
Loess paleosol is widely distributed and widely used in geotechnical engineering construction, but its fissure characteristics have brought adverse effects on engineering construction. In this paper, based on the assessment index of the same fissure in expansive soil and the anisotropy of the fissure development in Loess paleosol, the fissure is divided into three directions: vertical ( https://www.w3.org/1998/Math/MathML"> 90 ° ~ 60 ° https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9781032629506/f7620ddc-4f10-43e2-903d-c3ba6ff24216/content/inline-math37_1.tif" xmlns:xlink="https://www.w3.org/1999/xlink"/> ), oblique ( https://www.w3.org/1998/Math/MathML"> 60 ° ~ 30 ° https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9781032629506/f7620ddc-4f10-43e2-903d-c3ba6ff24216/content/inline-math37_2.tif" xmlns:xlink="https://www.w3.org/1999/xlink"/> ), and horizontal ( https://www.w3.org/1998/Math/MathML"> 30 ° ~ 0 ° https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9781032629506/f7620ddc-4f10-43e2-903d-c3ba6ff24216/content/inline-math37_3.tif" xmlns:xlink="https://www.w3.org/1999/xlink"/> ), and an evaluation index of the anisotropy of the number and total length of fissures in Loess paleosol is established. Field investigation of the Loess paleosol fissure network was carried out by using the defined index of Loess paleosol fissure assessment. The investigation results show that the total number and total length of fissures in Loess paleosols in different directions are obviously different, and vertical fissures in paleosols are particularly developed. The development mechanism of anisotropic fissures in Loess paleosols is discussed. The research results provide a useful reference for the scientific evaluation of characteristics of paleo-soil fissures.
