2022 Vol. 30, No. 6
The evolution process of landslides with multi-sliding zones is characterized by the relative motion of multi-layer and stress discontinuities. Due to the mutual dislocation and pile-soil interaction between sliding bodies in different layers,the thrust distribution of the multi-sliding zones landslide is often complex. It is urgent to put forward the calculation method for the thrust distribution on stabilizing pile of multi-sliding zones landslide. In this paper,the horizontal limit equilibrium method is used to analyze the multi-sliding zones landslide. According to the stress analysis under the limit equilibrium state of horizontal micro segment,the landslide thrust on stabilizing pile in each layer is obtained. When analyzing the force balance in the vertical direction,it is necessary to consider the downward force transmission of sliding mass in different layers,resulting in the sudden change of landslide thrust distribution function at the sliding zone. The thrust distribution function on stabilizing pile of multi-sliding zones landslide is derived and verified by numerical simulation,which means that the function is reliable. The thrust calculation method of multi-sliding zones landslide is proposed in this paper,which provides a certain idea for the treatment of multi-sliding zones landslide.
The evolution process of landslides with multi-sliding zones is characterized by the relative motion of multi-layer and stress discontinuities. Due to the mutual dislocation and pile-soil interaction between sliding bodies in different layers,the thrust distribution of the multi-sliding zones landslide is often complex. It is urgent to put forward the calculation method for the thrust distribution on stabilizing pile of multi-sliding zones landslide. In this paper,the horizontal limit equilibrium method is used to analyze the multi-sliding zones landslide. According to the stress analysis under the limit equilibrium state of horizontal micro segment,the landslide thrust on stabilizing pile in each layer is obtained. When analyzing the force balance in the vertical direction,it is necessary to consider the downward force transmission of sliding mass in different layers,resulting in the sudden change of landslide thrust distribution function at the sliding zone. The thrust distribution function on stabilizing pile of multi-sliding zones landslide is derived and verified by numerical simulation,which means that the function is reliable. The thrust calculation method of multi-sliding zones landslide is proposed in this paper,which provides a certain idea for the treatment of multi-sliding zones landslide.
This paper aims to study the effect of complex climatic conditions on the dynamic properties of alkali slag cured lightweight soils. Dynamic triaxial tests were conducted for alkali slag cured lightweight soils under the action of dry and wet freeze-thaw coupling. The test results show the follows. The cumulative strain curve of alkali slag cured lightweight soil exhibits three different forms,i.e.,stable,critical and destructive. The axial strain of cured soil increases with the increase of the number of dry and wet freeze-thaw coupling and the decrease of the freezing temperature,among which the effect of the first three times is greater,and basically reaches stability after five times. According to the axial strain law of cured soil,the cumulative dynamic strain prediction model is established. With the decrease of the freezing temperature,the dynamic strength of alkali slag cured lightweight soil gradually decreases. As the freezing temperature decreases,the dynamic strength of alkali slag cured lightweight soil gradually decreases,and the trend of decrease is faster and then slower,and finally stabilizes. With the increase of the number of wet and dry freeze-thaw cycles,the rate of decrease of dynamic strength is faster and then slower,and the decrease of dynamic strength is larger in the first three times,and the change is smaller after five times. Combined with the development law of dynamic strength,the relationship among the number of wet and dry freeze-thaw coupling,freezing temperature and dynamic strength is proposed,which can provide some theoretical guidance in the practical application of engineering. This paper provides some theoretical guidance in practical engineering applications.
This paper aims to study the effect of complex climatic conditions on the dynamic properties of alkali slag cured lightweight soils. Dynamic triaxial tests were conducted for alkali slag cured lightweight soils under the action of dry and wet freeze-thaw coupling. The test results show the follows. The cumulative strain curve of alkali slag cured lightweight soil exhibits three different forms,i.e.,stable,critical and destructive. The axial strain of cured soil increases with the increase of the number of dry and wet freeze-thaw coupling and the decrease of the freezing temperature,among which the effect of the first three times is greater,and basically reaches stability after five times. According to the axial strain law of cured soil,the cumulative dynamic strain prediction model is established. With the decrease of the freezing temperature,the dynamic strength of alkali slag cured lightweight soil gradually decreases. As the freezing temperature decreases,the dynamic strength of alkali slag cured lightweight soil gradually decreases,and the trend of decrease is faster and then slower,and finally stabilizes. With the increase of the number of wet and dry freeze-thaw cycles,the rate of decrease of dynamic strength is faster and then slower,and the decrease of dynamic strength is larger in the first three times,and the change is smaller after five times. Combined with the development law of dynamic strength,the relationship among the number of wet and dry freeze-thaw coupling,freezing temperature and dynamic strength is proposed,which can provide some theoretical guidance in the practical application of engineering. This paper provides some theoretical guidance in practical engineering applications.