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边坡的破坏一般表现为岩土介质的抗拉破坏和剪切破坏。基于抗剪强度指标c和φ,运用弹塑性理论和有限元强度折减方法,并结合土体强度发挥系数SEF特性(不同安全系数下的SEF值,程序计算所得塑性区的分布为判据),分析得出了土坡的整体稳定安全系数、边坡潜在破坏区的范围以及破坏时土体强度发挥的程度等结果。计算表明:边坡土体在达到其抗剪强度的80%左右时,便表现出不同程度的破坏,同时该值又接近于土体的长期强度值。相比较而言,本文方法确定的强度发挥值对分析土坡稳定性是可靠的,且意义明朗、简便易行,对类似的工程实际,具有一定的借鉴意义。
Slope damage is generally manifested as tensile damage and shear failure of geotechnical media. Based on the shear strength indexes c and φ, with the elasto-plastic theory and finite element strength reduction method, combined with the SEF characteristics of soil strength (SEF values under different safety factors, the distribution of plastic zone calculated by the program as a criterion) , The overall stability and safety factor of the slope, the range of the potential damage area of the slope and the extent of the soil strength exerted during the failure are analyzed. The calculation shows that when the slope soil reaches about 80% of its shear strength, it will show different degrees of damage, and the value is close to the long-term strength value of the soil. In comparison, the intensity value determined by the method in this paper is reliable for the analysis of slope stability, and it has a clear meaning and is simple and easy to be used. It is of certain reference significance for similar engineering practice.