CAJ | 학술논문

为分析粗粒土与土工格栅复杂界面作用特性，通过设计改良后的可视化大型直剪设备，采用双向土工格栅为加筋材料，对素粗粒土和加筋粗粒土直剪试验进行界面研究。分别考虑法向压力、粗粒土中的粗粒含量P5等多因素的变化对筋土界面的性质影响。利用高清数码相机对试验剪切过程进行跟踪采集，研究素粗粒土和加筋粗粒土直剪试验过程中剪切面位移场变化规律。结果表明：加筋粗粒土比素粗粒土的内聚力有所增加，内摩擦角有所降低，加筋粗粒土直剪界面区域土体颗粒位移最大值小于素粗粒土的位移最大值，但加筋土界面厚度大于素粗粒土界面厚度。土工格栅对土颗粒的嵌锁作用限制了土颗粒的剪切移动，增强了土体的稳定性，从而提高了土体的抗剪强度。
위분석조립토여토공격책복잡계면작용특성，통과설계개량후적가시화대형직전설비，채용쌍향토공격책위가근재료，대소조립토화가근조립토직전시험진행계면연구。분별고필법향압력、조립토중적조립함량P5등다인소적변화대근토계면적성질영향。이용고청수마상궤대시험전절과정진행근종채집，연구소조립토화가근조립토직전시험과정중전절면위이장변화규률。결과표명：가근조립토비소조립토적내취력유소증가，내마찰각유소강저，가근조립토직전계면구역토체과립위이최대치소우소조립토적위이최대치，단가근토계면후도대우소조립토계면후도。토공격책대토과립적감쇄작용한제료토과립적전절이동，증강료토체적은정성，종이제고료토체적항전강도。
Aimed at analyzing the complex interface action characteristics of geogrid and coarse grained soil, using the large visual direct shear equipment of improved design and adopting a reinforcement material of bidirectional geogrid, the direct shear test of coarse grained soil and reinforced coarse grained soil is conducted to study the interface action mechanism. The influences of the change of the normal pressure and the coarse material content of the coarse grained soil P5 on interfacial properties of reinforced soil are respectively considered. The process of the direct shear test of coarse grained soil and reinforced coarse grained soil is captured images with using the high-definition digital camera. The results show that the reinforced coarse grained soil cohesion is increased and friction angle is reduced than coarse grained soils; Soil particle maximum displacement value of reinforcement coarse grained soil is less than the maximum displacement value of the coarse grained soil in direct shear interface region, but the thickness of reinforced soil interface is greater than that of coarse grained soil interface. Geogrid to the soil particle interlock limits the movement of soil particles, and enhances the stability of the soil, so as to improve the shear strength of the soil.