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结合工程实践提出煤矸石-土工格栅-砂层状体系的加筋土结构,通过直剪试验和拉拔试验,测试不同法向应力下煤矸石-土工格栅-砂层状体系的筋土界面特性,并与常规加筋土结构的筋土界面特性进行对比。研究表明:层状加筋体系具与有常规加筋土体系相似的界面特性,但由于砂的充填作用,提高了加筋层的密实度,增大了筋土接触面,使筋土界面强度更高,且界面强度发挥更早;层状加筋土体系还可以为加筋煤矸石提供排水通道,避免煤矸石浸水软化。
The reinforced earth structure of coal gangue-geogrid-sand layered system was put forward in combination with engineering practice. The strength of coal gangue-geogrid-sand layered system under different normal stresses was tested by direct shear test and pullout test Interface characteristics, and compared with the conventional reinforced soil structure of the soil interface characteristics. The research shows that the layered stiffened system has the similar interface characteristics with the conventional stiffened earth system. However, due to the filling effect of the sand, the compactness of the stiffened layer is increased, the contact area of the reinforced earth is increased, and the interface strength of the reinforced earth Higher, and the interface strength to play earlier; layered reinforced earth system can also provide drainage channels for reinforced coal gangue to prevent the coal gangue from water softening.