惠民砌石拱坝设计

Design of the Fine-stone Concrete Masonry Arch Dam in Huimin Reservoir

针对惠民水库存在坝址区裂隙发育、基坑边坡稳定性较差、卵漂石抗冲性较弱、岩体透水性强,对坝基、拱座受力和稳定性不利的问题,经现场勘探,考虑工程区的工程地质、施工难度及投资效益等因素,优选C15细石混凝土砌石拱坝坝型。结合SL25-2006砌石拱坝设计规范,对拱坝枢纽布置方案进行了适当的优化调整,并对坝顶高程、坝体应力变形、拱座稳定性等进行了详细计算分析。结果表明:拱坝应力、位移分布规律合理;拱座左、右岸整体稳定最小安全系数,满足规范要求;坝体应力状态和拱座整体稳定性较好。

In the dam site of Huimin Reservoir, geological problems in the foundation and abutments such as tile fractm＇e development, poor stability of the foundation pit slope, weak anti-scouring feature of the cobble and boulder materials, and high permeability of the foundation rocks could seriously affect the stresses and stabilities of the dam fbuudation and abutments. Considering the engineering geological conditions, construction difficulty, investment and benefits, a design scheme of C15 fine-stone concrete masonry arch dam is selected. According to the state design specification SI25-2006, an optimization design is carried out on the dam layout, and the dam crest elevation, dam stresses and deformation, and abutment stability are calculated. The results show that the distributions of the dam stresses and displacement are reason- able, and the stress states are satisfactory. The left and right abutments are of good stability as the minimum safety fac- tors meet the specification requirements.