基于广义塑性理论框架的堆石料变形计算

Calculation of rockfill deformation based on the generalized plastic framework

堆石料是土石坝工程中承受水压力的主要载体,构建合理描述其力学特性的本构模型对预测高土石坝坝体应力与变形具有重要意义。根据三轴排水试验结果,建立描述堆石料强度和剪胀特性的应力表达式;在分析流变和湿化试验结果的基础上,建立流变和湿化变形的流动准则,并构建流变和湿化模量表达式,从而在广义塑性框架内建立能够统一计算堆石料加载、流变和湿化变形的计算方法。通过模拟堆石料的三轴排水、流变、湿化及三轴流变湿化组合等试验资料验证了该方法的合理性。

Rockfill is the primary load-bearing material in earth-rock dams,crucial for withstanding water pressure.Developing a constitutive model that accurately describes its mechanical properties is essential for predicting the stress and deformation in high earth-rock dam bodies.Based on triaxial drained test results,stress expressions describing the strength and dilatancy characteristics of rockfill are established.By analyzing the outcomes of rheological and wetting tests,flow rules for rheological and wetting deformations are formulated,and expressions for rheological and wetting moduli are constructed.This framework leads to a unified method for calculating rockfill loading,rheological,and wetting deformations within the generalized plasticity theory framework.The method’s validity is confirmed through simulations of triaxial drained,rheological,wetting,and combined triaxial rheological-wetting tests on rockfill.