CAJ | 학술논문

采用二维离散单元法模拟了素混凝土桩复合地基的浅层平板载荷试验。将数值试验结果与现场试验结果对比,以验证离散单元法的适用性,并基于加载过程中地基土体的宏微观响应,分析复合地基的破坏机理。分析结果表明：土体的转动场、应力偏转等变化较大的区域主要集中在直接承载的桩体周边区域,越向外侧所受影响越小;当荷载超过地基极限承载力时,复合地基发生冲切破坏,桩端发生刺入破坏;桩顶荷载、桩侧阻力、桩端阻力、桩土应力比与沉降的变化规律与现场试验结果相似,说明采用离散元法分析素混凝土桩复合地基的承载机理是可行的。
채용이유리산단원법모의료소혼응토장복합지기적천층평판재하시험。장수치시험결과여현장시험결과대비,이험증리산단원법적괄용성,병기우가재과정중지기토체적굉미관향응,분석복합지기적파배궤리。분석결과표명：토체적전동장、응력편전등변화교대적구역주요집중재직접승재적장체주변구역,월향외측소수영향월소;당하재초과지기겁한승재력시,복합지기발생충절파배,장단발생자입파배;장정하재、장측조력、장단조력、장토응력비여침강적변화규률여현장시험결과상사,설명채용리산원법분석소혼응토장복합지기적승재궤리시가행적。
The bearing tests on the composite ground treated by plain concrete piles is numerically simulated by the two dimensional Discrete Element Method（DEM）.The DEM＇s numerical results are compared with that of in-situ results,and the bearing mechanism of the composite foundation is analyzed.The numerical results show that the rotating field of the earth mass and stress field are strongly affected along the pile under the plate,which means that the adjacent pile has great constraint effect on the deformation of the soil between plies.When the load reaches the ultimate bearing capacity,the treated ground develops a punching shear failure and the pile develops a penetration failure.The change laws of pile top load,pile side resistance,pile tip resistance and pile-soil stress ratio with settlement are similar to the in-situ results,which indicates the feasibility of DEM in analysing the bearing mechanism of composite foundation.