水压力和轴力联合作用下常态混凝土的断裂试验研究

Experimental Investigation into Fracture of Normal Concrete under Combined Effects of Water Pressure and Axial Force

针对常态混凝土高坝在蓄水状态下可能出现的水力劈裂现象,采用恒定水压力加轴向拉力和恒定轴向拉力加水压力两种不同的加载方式,进行了水压力和外力联合作用下的常态混凝土试件轴拉试验。对试验结果进行了分析,得到了常态混凝土断裂的荷载-应变变化规律。结合试验条件计算了裂缝尖端的应力强度因子,得到了两种不同加载条件下的失稳断裂韧度,并进行了对比分析。

For the normal concrete dam that is under reservoir condition may appear the phenomenon of hydraulic fracturing, the uniaxial tensile experiments were made on crack of normal concrete under the combined effects of water pressure and axial force. Two modes of loading control for test including the constant water pressure with variable axial tension load and the constant axial load with variable water pressure were adopted. The load-strain curves were obtained by analyzing the experimental results. The unstable fracture toughness under the two different loading modes are also obtained and the contrastive analyses are made, with the stress intensity factors on the crack tip calculated.