摘要
根据边坡加固的内部机制,建立边坡非线性有限元计算模型;在给定控制点上,以边坡加固后应力状态与边坡未开挖时应力状态为边界条件,提出了基于滑面上应力控制的边坡主动加固计算方法。该方法给出了滑面上应力控制点选取模型,并以等效应力作为应力控制的判别准则,建立了边坡加固应力控制函数。以应力控制函数为目标函数,以外部加固荷载及分布为约束条件,借助遗传算法建立边坡应力控制智能优化模型,实现了基于滑面上应力控制的边坡主动加固设计计算。最后,经过实例计算及模型试验表明,该方法通过优化控制外部加固荷载大小与分布,可有效地控制和修复边坡内滑面上应力损失。所提出的方法是一种以稳定性为前提的边坡主动加固计算的新方法,具有可行性和合理性,所得结论可为边坡加固治理及施工方法提供重要依据。
According to the inherent force mechanism of slope reinforcement, the calculation model of nonlinear FEM is constructed for the slope reinforcement. Taking the assumption that the stress condition of reinforced slope is equivalent to the stress condition of unexcavated slope at the given control points, a new calculation model of active slope reinforcement is put forward on the basis of method of stress control in the critical slip surface. This method provides a model for the selection of stress control point in the critical slip surface, and takes the equivalent stress as the weight discriminant of stress control at the control points. Thereafter, the functions of the stress control are established for the slope reinforcement. Moreover, an intelligent optimum model of slope stress control is constructed by virtue of the GA, taking the control function of stress as the objective function, and taking the magnitude and distribution of exterior reinforced loads as the restraint conditions. The design and calculation of active slope reinforcement based on the method of stress control in the critical slip surface can then be realized. Finally, by means of case study and model test, this method is proven to be feasible and rational. It is a new calculation method controlling the magnitude and distribution of exterior reinforced loads to compensate for the internal stress loss for the active-reinforced slope; and the calculation results can provide references for slope reinforcement and construction methods.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2008年第5期979-989,共11页
Chinese Journal of Rock Mechanics and Engineering
基金
甘肃省科技厅攻关资助项目(2GS064–A52–040)
关键词
边坡工程
边坡主动加固
非线性
应力控制
临界滑移面
模型试验
slope engineering
active slope reinforcement
nonlinearity
stress control
critical slip surface
model test
