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高心墙土石坝的安全性评价问题涉及到土坝的变形与渗流规律及相关力学参数的确定,是当前土力学研究的热点与难点之一。由于土石坝受施工过程中施工工艺、施工方法和施工质量以及运行期运行环境和管理方法的影响,土石坝坝料的实际力学参数与原设计参数有一定的差别。为获得西安黑河黏土心墙土石坝大坝填料实际的力学参数,利用大坝的应力、变形与渗流观测资料,通过深入分析大坝变形机制和渗流特征,建立了黑河黏土心墙土石坝变形与荷载之间的对应关系,提出了基于准饱和土固结理论的心墙土石坝分期位移反分析的思路与方法,实现了心墙土石坝施工期、运行期全过程反演。结果表明该方法可反演得到心墙土石坝填筑材料的主要参数(邓肯-张模型)、心墙渗透系数及湿化变形参数。反演思路与方法对同类工程设计与反分析具有参考意义。
The problem of safety evaluation of high-core earth-rock dams involves the deformation and seepage of earth dams and the determination of relevant mechanical parameters, which is one of the hot and difficult issues in current soil mechanics research. Due to the influence of construction technology, construction method and construction quality, operation environment and management method during the construction process of earth-rock dam, the actual mechanical parameters of earth-rock dam dam have some differences from the original design parameters. In order to obtain the actual mechanical parameters of dam fillings of Xi’an Heihe clay core earth dam, the deformation, deformation and seepage of the dam were analyzed. Through the in-depth analysis of dam deformation mechanism and seepage characteristics, Based on the correspondence between loads, the idea and method of staged displacement back analysis of core earth dam based on the theory of quasi-saturated soil consolidation are proposed, and the whole process of core earth-rock dam reconstruction and inversion is realized. The results show that the method can be used to retrieve the main parameters (Duncan-Zhang model), core wall permeability coefficient and wet deformation parameters of core-wall earth-rockfill dam. The ideas and methods of inversion have reference significance for the similar engineering design and back analysis.