静水压力环境下混凝土裂缝扩展长度试验研究

Experimental study on crack propagation on hydrostatic pressure circumstance

混凝土裂缝扩展一直是工程界研究的热门课题,而水压下混凝土裂缝扩展的研究对于混凝土坝的安全运行有着极为重要的作用。基于此背景,开展了大型混凝土试件在水压装置作用下的裂缝扩张长度的研究,通过全桥应变连接的试验方法和双K断裂理论,分别得到了裂缝扩展长度,并根据对应长度计算了失稳断裂韧度和黏聚断裂韧度。结果表明裂缝扩展长度在两种方法下的误差较小。断裂韧度的最大误差相对较大,但平均误差仍在工程允许范围内。

It is important to study the crack propagation under hydrostatic pressure because of the dam collapse by plenty of cracks in hydraulic concrete.Hence he length of crack propagation is compared to the experimental value by full-bridge strain gauges,which are widely used for the simplicity and facility.Furthermore the unstable fracture toughness and cohesion fracture toughness.It is concluded that the experimental results are larger than the calculation because the crack in the interior is ahead of the surface.However the average error is approximately meet the require-ment in the engineering practice,and the experimental methods can be used in the water pressure for the limitation of calculation.