Analysis Of Deformation Characteristics Of A Landslide At A Special Contact Between Rock And Soil

The research on the mechanism of landslide formation evolution is an important direction for scholars to study landslides.Landslide deformation mechanism research can help humans better predict and forecast and effectively prevent the occurrence of landslide disasters.It also contributes to the analysis and evaluation of landslide stability and the types of landslides.This paper mainly studies the landslides by taking a special contact landslide on the north side of the Red Tourism Memorial Hall as an example.Based on the deformation mechanism,the on-site field survey was conducted to analyze landslide activity characteristics,development types,types of movement,and formation conditions.In this paper,physical and mechanical experiments and X-ray diffraction tests were performed with soil samples to infer the deformation mechanism and formation process of landslides in accordance with previous research results.Using the transfer coefficient method combined with numerical simulation analysis method to verify the slope stability.The results achieved are as follows:?1?The landslides on the north side of the Red Tourism Memorial in Zhaojin Town can be classified into low-speed slow-acting landslides according to the type of movement.This paper discusses the movement characteristics of this type of landslide,and divides the origin of the landslide into two aspects.On the one hand,the“double-heterogeneous”structure of the landslide body is an internal condition that forms a weak zone at the contact surface,and on the other hand continues.The heavy rain and slope excavation directly triggered the sliding of the landslide.?2?The montmorillonite minerals in clay will be wrapped around the other minerals with flake-like particles,affecting and controlling the strength of the clay^[11].The test found that the sliding zone soil contains more clay mineral montmorillonite,which accumulates in the contact zone.Under the effect of water,the mineral will not only reduce the shear strength of the soil,but also absorb water and increase the self-weight of the soil.?3?The slope is very low,and sliding still occurs during the construction of the pavilion.This is due to the fact that the vertical fractures in the upper part of the landslide are well developed.Rainfall infiltration penetrates into the contact zone along the cracks,lubricates the lower bedrock surface,and reduces the sliding zone.Soil strength increases the result caused by the overlying soil's own weight.The excavation of the foundation pit at the front of the landslide further induced the creep of the landslide.?4?The main sliding surface?belt?of the contact landslide is located at the silty clay-mudstone contact surface where the water content is nearly saturated or saturated,and the mechanical strength of the sliding belt soil becomes very low because of water,even if the sliding surface Through the penetration,the decrease in anti-slip force is not great.On the other hand,the sliding belt itself has a certain ability to recover,coupled with the effect of energy dissipation,so this type of special contact surface landslide has a low sliding speed and a short sliding distance,and can only produce short-range creep.Because of the"crowding-out"effect,the scale of landslide impacts is usually larger.Therefore,such landslide assessment and prediction should focus on the scale of impact of the landslide front-edge crowding effect on the landslide front site.