借助威布尔分布函数描述岩坡微元发生破坏前后的存活率,结合损伤力学理论和有限元强度折减法,建立存活率、稳定系数和累积损伤因子的内在联系,实现山区道路边坡在全生命周期内的阶段式预警。结果表明:边坡疲劳稳定系数随疲劳寿命的消耗而降低,具有初期变化敏感、中间缓慢过渡和后期迅速下降的特点,边坡存活率随着剩余寿命和安全系数的减小而减小;边坡全生命周期内的阶段式预警可分为初始蠕变、稳态发展、快速发展、滑动破坏4个阶段,边坡的稳定系数、存活率和道路运营年限均随变形的发展逐渐减小,直至失稳破坏。提出耐久性因子,评价道路边坡在其全生命周期内的耐久性,边坡工程设计中应通过不断调整抗疲劳措施,使其处于稳态发展阶段。研究成果可为边坡工程的安全性与耐久性评价提供有意义的参考。
Abstract
Weibull distribution function is employed to describe the survival rate of micro-units of rock slope before and after damage; fatigue damage model and strength reduction FEM are also established to reflect the relationship between survival rate, cumulative damage factor and stability coefficient so as to achieve the staged early warning for mountain road slope in its whole life cycle. Results show that the coefficient of fatigue stability in the whole life cycle of slope would decrease under fatigue life reduction, changing sensitively in the early stage, attenuating slowly in middle stage and dropping rapidly in the later stage. The survival rate of slope declines with the reducing of residual life and safety factor. The early warning could be divided into four stages, namely initial creep, steady development, rapid development, and sliding failure. In the four stages, the stability coefficient, survival rate, and operation life of mountain road are all attenuating along with the development of deformation until slope failure. In addition, the concept of slope durability factor is proposed to evaluate the durability of road slope during its whole life cycle. In the durability design of slope engineering, fatigue-resisting measures should be adjusted continuously to make it in steady state development stage.
关键词
山区道路边坡 /
全生命周期 /
存活率 /
阶段式预警 /
耐久性因子
Key words
mountain road slope /
whole life cycle /
survival rate /
staged early warning /
durability factor
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基金
国家自然科学基金项目(41702288);福建省自然科学基金项目(2018J01635);福建省教育厅中青年教师教育科研项目(JAT170173)
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