碾压混凝土重力坝全程综合仿真分析与安全评估

Integrated simulation and safety assessment for RCC gravity dam on rock foundation during whole process of construction

运用有限元方法对光照碾压混凝土重力坝进行施工期温度、渗流、应力应变的综合仿真分析,得出了温度场、渗流场及应力场的分布规律,在此基础上评价整个坝体与坝基系统稳定性的安全度,为坝体与坝基系统的温控、渗控和安全性评价提供参考依据。同时对光照碾压混凝土重力坝进行了不考虑温度、徐变、浇筑过程和蓄水过程的应力-应变和安全度计算,并对两种计算的结果进行了比较,结果表明:对碾压混凝土重力坝而言两者的位移相差最大,达70 mm;应力差别其次,达1.5 MPa;而整体稳定超载安全系数则没有本质区别。由于变形、应力和稳定安全系数在碾压混凝土重力坝设计中都是重要指标,所以综合仿真分析具有意义。

By using finite element method, integrated simulation of whole process including temperature, seepage, stress and strain is carried out for Guangzhao RCC gravity dam. The results reveal the distribution laws of temperature field, seepage field and stress field. Based on the integrated simulation of whole process, the global safety degree of the dam-foundation system, which is important for the safety evaluation as well as the corresponding control measures of the temperature and seepage fields during the dam construction, is evaluated. The results are also compared by the conventional method and the integrated simulation of whole process for the Guangzhao RCC gravity dam, from which it is found that the largest displacement difference is 70 mm; the largest stress difference is 1.5 MPa; and there is no substantial difference in global safety degree. Since the deformation, stress and global safety degree are important indices in designing RCC gravity dam, the necessity of integrated simulation of whole process for RCC gravity dam is emphasized.