CAJ | 학술논문

通过模型试验结合三维数值模拟的方法，探讨了在软土地基上碎石垫层和加筋碎石垫层的工作特性；分析了不同垫层厚度、土工格栅、格栅层数等参数变化，对碎石垫层和加筋碎石垫层变形模量、竖向应力场、沉降变形的影响。研究结果表明：1）土工格栅加筋垫层应力扩散效果明显强于纯碎石垫层，从而降低了垫层的总体沉降；2）垫层内部应力由底端向顶部发展，当荷载较小时，垫层底部先出现应力集中现象，随着荷载增大，应力集中区域向顶部靠近；3）随着格栅层数的增加，加筋垫层的应力集中区及沉降量的范围有所减小。
통과모형시험결합삼유수치모의적방법，탐토료재연토지기상쇄석점층화가근쇄석점층적공작특성；분석료불동점층후도、토공격책、격책층수등삼수변화，대쇄석점층화가근쇄석점층변형모량、수향응력장、침강변형적영향。연구결과표명：1）토공격책가근점층응력확산효과명현강우순쇄석점층，종이강저료점층적총체침강；2）점층내부응력유저단향정부발전，당하재교소시，점층저부선출현응력집중현상，수착하재증대，응력집중구역향정부고근；3）수착격책층수적증가，가근점층적응력집중구급침강량적범위유소감소。
By means of model test and 3D numerical simulation, discusses the working behaviors of gravel cushion and reinforced gravel cushion in the soft soil foundation respectively, and analyzes effects of the parameters of cushion thickness, geogrids and geogrid layers on the deformation modulus, vertical stress field and settlement deformation of gravel cushion and reinforced gravel cushion. The research results indicate that: 1)The stress diffusion effect of the reinforced gravel cushion of geogrids is obviously stronger than that of pure gravel cushion; 2)The internal stress of the cushion develops from bottom to top. When applying a small load, the cushion bottom appears stress concentration phenomenon, with the increase of load, the stress concentration area moves closly to the top of cushion; 3)With the increase of geogrid layers, the stress-concentration range and the settlement of reinforced gravel cushion reduced.