MgO微膨胀混凝土拱坝裂缝的非线性模拟

2Nonlinear analysis of cracks in gentle volume expansive concrete arch dam

沙老河拱坝利用MgO混凝土的微膨胀性 ,不分横缝 ,不做温控 ,整体浇筑而成 ,在拱坝完工的当年冬季和次年冬季 ,坝体出现了多条裂缝。本文利用水科院提出的MgO混凝土膨胀模型及开发的SAPTIS程序 ,采用实际的施工资料、材料参数及气象条件 ,对坝体的温度场、应力场及裂缝开裂过程进行了仿真计算分析 ,并对裂缝产生的原因进行了研究 ,结果表明 ,数值模拟的裂缝开裂状况与实际观测结果相吻合。

Shalaohe arch dam was constructed without transverse joint and temperature control measures on the basis of volume expansion property of the concrete with admixture of proper MgO. In the first winter and the second winter after the dam was completed, many cracks occurred in the dam. In this paper, the temperature field, stress field and the crack growth in the dam are computed by using MgO-expansion model and SAPTIS software developed by China Institute of Water Resource and Hydropower Research, based on the actual construction records, parameters of materials and meteorological data of Shalaohe dam. The result shows that the numerical simulation of crack growth is identical with the actual observational data.