冻土强度准则在冻土边坡稳定性计算中的应用

Abstract

Frozen soil，as a four phase cementitious matrix，composed of ice cement，soil particles，gas，and unfrozen water. Its strength is greatly affected by temperature. Therefore，the strength properties of frozen soils are more complex than those of unfrozen soils. Strength criteria of frozen soil have a wide range of applications in practical engineering，for example，strength criteria of frozen soil can be used to analyse the frozen soil slope stability. Due to the complexity of frozen soil，it is unreasonable to directly apply the strength criteria of unfrozen soil to the stability analysis and calculation of frozen soil slope engineering. To study the application of frozen soil strength criterion in the analysis of frozen soil slope stability. In this paper，representative frozen soil strength criterion proposed by Liao and Lai is selected from the existed frozen soil strength criteria，the solution of safety coefficient of frozen soil slope is derived firstly by using the Swedish strip method and the selected strength criterion；Secondly，based on the solution of safety coefficient of frozen soil slope is derived by the selected strength criterion，stability calculation and analysis of frozen soil slopes were carried out. The applicability of the selected strength criterion is verified by comparing the calculated results with the existed analysis data of frozen soil slope. The calculated results show that the safety coefficient calculated by the selected strength criterion is close to the original safety coefficient of frozen soil slope，and the error is small. The strength criterion has high accuracy and applicability in calculating the stability of frozen soil slope. Finally，considering that there are many unstable frozen soil slopes in practical engineering，based on the practicality of the project，the current prevention and control measures of frozen soil slope instability are summarized. This study can provide theoretical guidance and reference for designing，construction and maintenance of frozen soil slope in cold regions.