基于实测温度的拱坝裂缝稳定性分析

温度荷载作为拱坝的主要荷载，对拱坝裂缝的出现和稳定有很大的影响．因此准确的再现施工期温度场是对拱坝裂缝进行稳定性分析的前提条件．采用自适应遗传算法对某拱坝大坝混凝土的绝热温升参数进行了参数反演，采用反演后的绝热温升参数进行施工期温度场仿真分析．采用带拉断的Mohr—Coulomb破坏准则判断混凝土的开裂．裂缝出现后，概化出两组主要裂缝，采用线弹性断裂力学分析裂缝的稳定性．由于裂缝稳定性分析要求裂缝附近有较密的网格，基于兼顾计算效率和精度的考虑，采用子模型法处理裂缝部位．

Analysis of Crack Stability of Arch Dam Based on Measured Temperatures

Thermal load is the main load of arch dam during the construction period; it has a great impact on the crack appearance and propagation. In view of this, the accurate temperature field is the precondition for analyzing crack stability. Parameter inversion in concrete adiabatic temperature rise for an arch dam is conducted based on adaptive genetic algorithm. Then the inversion parameters are used in the temperature field simulation of construction period. After the appearance of cracks, this paper generalizes about these cracks to form two group of cracks, the elastic fracture mechanics is then adopted to analyze the stability of generalized cracks. The analysis of crack stability requires a finer finite element model, in light of computational efficiency and accuracy, the submodel method is employed to deal with the cracks.