碾压混凝土在水压与机械荷载耦合作用下断裂数值模拟分析

The numerical simulation analysis for RCC under the coupled hydraulic and mechanical loads

碾压混凝土软弱层面的断裂破坏是碾压混凝土坝稳定性研究的一个重要的方面,本文考虑了碾压混凝土的多相非均匀性细观结构特征,采用RFPA分析系统对在水压与机械荷载共同作用下,碾压混凝土水平软弱层面破坏的全过程进行了模拟分析。通过模拟,给出了碾压混凝土层面破坏过程的应力、弹性模量以及水压力的分布图,得到了起裂荷载、失稳荷载以及临界裂缝扩展长度等参数,并计算得到了各种工况下碾压混凝土的双K断裂韧度,对碾压混凝土层面破坏过程进行了分析。结果表明,起裂韧度、失稳韧度都随着初始荷载的增加而产生的变化有一定的规律性。

the instability failure of rolled compacted concrete is one of important characteristics of RRC Dam stability study, this paper, considers the multi-phase,uniform micro-structure characteristics of RCC. The simulation analysis for the process of the failure of RCC soft layer with RFPA analysis system has been carried out under the action of the hydraulic pressure together with the mechanical load. It provided the stress, elastic modulus, and water pressure distribution during the process of the failure of RCC soft layer, and obtained pa- rameters of the cracking load, buckling load and critical crack propagation length, the double-K fracture toughness of RCC was calculated under a variety of conditions, the failure process of RCC was analyzed. The results showed that crack initiation toughness, instability toughness were increased with the initial load due to a change with some regularity.