摘要
为模拟综采面坚硬顶板弱化现象,在实验室预制了150 cm×30 cm×30 cm和200 cm×20 cm×20 cm 2种不同尺寸的混凝土试块,进行了2种不同孔径和孔深的深孔静态破碎试验。通过对破裂过程的应变测试和理论分析,揭示了静态破碎混凝土时产生的破裂裂纹长度及扩展的规律,试验结果对工程设计和施工具有一定的指导意义。
In order to simulate the fully mechanized mining face with hard roof weakening, two kinds of concrete test blocks 150 cm×30 cm×30 cm and 200 cm×20 cm×20 cm were fabricated in the laboratory, and two static crushing tests of deep hole with different aperture and hole depth were carried out. Through the strain testing and theoretical analysis of the fracture process, the crack length and the propagation law of the crack are revealed. The experimental results have certain guiding significance to the engineering design and construction.
出处
《煤炭技术》
CAS
北大核心
2016年第3期44-46,共3页
Coal Technology
基金
国家自然科学基金项目(51374012)
