Study on Deformation Characteristics and Water Content Response of Typical Soil Landslides in Sanmenxia Open-pit Mining Area, Western Henan

Zudong Hu ； Zhengjiang Liu ； Na Li

《International Core Journal of Engineering》 7卷9期 (2021/09) Pp. 92-103

https://doi.org/10.6919/ICJE.202109_7(9).0015

摘要

In the process of open-pit mining, the special type of soil landslide is formed by the accumulation of peeling soil and the disturbance of mining pit slope. There is a great difference between the geotechnical properties of the landslide and the soil landslide cultivated by the original soil, and the stability is poor, which seriously threatens the life safety of mine workers. Based on field investigation and physical model experiment, the deformation characteristics and moisture content variation characteristics of soil landslide induced by typical open-pit mining in Sanmenxia area, western Henan province were systematically studied. By analyzing and summarizing the breeding conditions and evolution characteristics of typical soil landslide in Sanmenxia area, western Henan province, the breeding process of soil landslide can be divided into three stages: embryo stage, development stage and maturity stage. Through indoor physical model experiment, the process of landslide instability under natural state and rainfall condition was simulated, and the variation characteristics of soil moisture content were observed synchronously throughout the whole process. The results show that the slope stability in natural state is mainly affected by the slope, and the breeding of soil landslide is mainly controlled by the slope and water content under the rainfall condition. The water content in the embryonic stage range from 12.5% to 21.8%. Affected by the collapseability of the soil itself, fine cracks first develop in one place. In the development stage, the water content range from 21.9% to 40.3%. The surface slope was eroded and cracks developed. The erosion degree increased step by step from the top to the toe of the slope. In the mature stage, the water content is in the range from 40.4% to 46.9%, the internal and external cracks are fully developed, the tensile crack surface is formed, and the regional small collapse causes the soil in front of the slope foot to be empty. Under the same conditions, the greater the slope, the more likely the instability is.

關鍵字

Soil Landslide ； Deformation Characteristics ； Moisture Content ； Physical Model

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