【摘要】 高拱坝坝趾区域是加固设计的重点关注区域。为了对其锚固进行研究,进一步阐述基于变形加固理论的高拱坝坝趾锚固机制。给出坝趾锚固区域不平衡力的计算方法和坝趾锚固的基准状态。将这一机制应用于白鹤滩高拱坝坝趾锚固数值分析中,得到锚固所需的最小加固力和最优锚固角,并分析坝趾不平衡力分布规律的原因。同时,对白鹤滩高拱坝进行大比例尺(250∶1)下的地质力学模型试验研究。通过对加载过程中的位移、应变和开裂的监测和分析,得出坝趾区域随荷载增加过程的破坏规律。通过对地质力学模型试验与数值分析结果的对比分析表明,两种研究方法的结论是相一致的,白鹤滩高拱坝左岸坝趾较右岸坝趾更为薄弱。研究结果表明,变形加固理论为坝趾锚固分析和评价,提供科学的理论基础和实用的分析方法。更多还原

【Abstract】 High arch dam toe area is the focus of reinforcement design.In order to study its anchorage,anchorage mechanism of high arch dam toe,based on the deformation reinforcement theory,is farther illuminated.In this mechanism,the unbalance force of a load case is the corresponding minimal reinforcement for stability and unbalanced force direction is the optimal design of anchorage direction.Combined with this idea,the method of unbalanced force calculation and normal condition of anchorage of high arch dam toe area are presented.The mechanism is applied to numerical analysis of anchorage of Baihetan high arch dam toe,and the minimum reinforcement force and the optimal design of anchorage direction are obtained.The reasons of unbalanced force distribution law are analyzed.At the same time,geomechanical model experimental research,under large-scale (250∶1),is carried out.From loading to failure,the displacement,strain and crack of high arch dam toe are monitored and analyzed;failure relationship between dam toe area and loading process is obtained.The experimental results and the numerical ones consistently show that left bank dam toe area of Baihetan arch dam is more vulnerable than the right ones.The research validates that deformation reinforcement theory provides scientific theoretical basis and practical analyzing method for anchorage of high arch dam toe.更多还原