高拱坝坝踵混凝土首条裂缝开裂宽度研究

On the Width of the First Fracture Occurred in Concrete in High Arch Dam Heel

基于混凝土侧向渗透系数与轴拉应变试验曲线、立方定律,通过建立开裂扰动区域流量守恒等式,推导了处于高压水环境下的高坝坝踵混凝土,在上游某额定水头作用下首条裂缝的开裂宽度,以及开裂扰动区域的范围。结果表明,高拱坝坝踵混凝土等级不同,首条裂缝的宽度也不同,但均处于1E-04 m量级;开裂扰动区域的深度亦不同,但处于1E+01 m量级。

Based on measured curves of the lateral permeability and the axial tensile strain test of the concrete and the cubic law , the width of the first fracture that may occur in concrete in the high arch dam heel under the condition of a high water pressure , as well as the depth of the disturbed area , is deduced after establishing the flow conservation equa-tion for the disturbed area .Results show that the width of the first fracture is related to the grade of the concrete in the high arch dam heel, while all in the same order of 1E-04 m.Also, the depths of the disturbed concrete area are differ-ent for different concrete grades , while all in the same order of 1E＋01 m.