整体浇筑堆石混凝土拱坝拱梁分载法分析研究

贵州省遵义市地处气候温和地区，为了充分发挥堆石混凝土拱坝的优势，在取消振捣/碾压和冷却水管温控措施的基础上，简化坝体构造与施工、加快施工进度，在保障工程建设质量和安全的前提下，提出了不分横缝，整体浇筑的堆石混凝土拱坝。本文针对绿塘、龙洞湾、沙千和风光4座整体浇筑堆石混凝土拱坝，采用拱梁分载法进行应力分析，对拱圈封拱温度的选取，自重荷载处理方式，坝体与地基材料参数对拱坝应力的影响等开展研究，对4座拱坝的安全性进行论证，建议了辅助温控措施，并提出了整体浇筑堆石混凝土拱坝拱梁分载法应力复核方法及其控制标准：应根据拱坝实际浇筑温度估算拱坝每个拱圈的计算封拱温度，参照混凝土拱坝设计对坝体与地基材料参数进行取值，采用拱梁分载法进行拱坝应力复核，相应的允许应力标准初步可按照1.5～2.0 MPa控制。本文提出的分析方法除可以应用于整体浇筑堆石混凝土拱坝以外，对整体浇筑的碾压混凝土拱坝和砌石拱坝也有重要参考价值。

Trial load analysis for integral casting RFC arch dams

In order to give full play to the advantages of rock-filled concrete (RFC) arch dams, further simplify the construction and speed up the construction progress on the basis of canceling vibration/rolling compaction and cooling pipe,RFC arch dams without transverse joints and casted integrally have been constructed in Zunyi, Guizhou Province, where is a mild climate area. In this paper, the stress analysis and safety evaluation on Lyutang,Longdongwan,Shaqian and Fengguang RFC arch dams is conducted under different calculation conditions by the trial load method. The closure temperature of each arch,dead load,calculation material parameters are studied. Suggestions for the trial load method of the integral casting RFC arch dams are presented, i.e., the stresses of an arch dam shall be checked by the trial load method where the calculated closure temperature for each arch shall be estimated according to the actual casting temperature of the arch, the calculation material parameters could be selected referring to concrete arch dams,and the allowable stress could be set as 1.5 MPa~2.0 MPa. The method can be applied to not only integrated RFC arch dams,but also integral casting RCC or masonry arch dams.