CAJ | 학술논문

通过三维模型试验对桩承式路堤中土拱效应发挥过程进行了研究,重点分析了不同桩顶盖板尺寸、不同加筋方式下应力折减系数与差异沉降之间的关系.结果表明,土拱效应随变形的增加而发挥;加筋材料的设置减小了差异沉降,削弱了填土中的土拱效应,荷载向桩顶的传递是土拱效应和拉膜效应共同作用的结果.采用有限元法对桩间距、填土高度等未能在模型试验中考虑的关键因素进行了参数敏感性分析,总结了土拱效应发挥过程的相关规律.根据有限元计算结果、试验数据和文献中收集到的实测资料,提出用土拱效应发挥系数和归一化位移来描述土拱效应的发挥过程,建议二者之间采用双曲线方程模拟,从而在设计中体现土拱效应随位移的发展,并满足路堤填土、加筋材料和地基之间的变形协调要求.
통과삼유모형시험대장승식로제중토공효응발휘과정진행료연구,중점분석료불동장정개판척촌、불동가근방식하응력절감계수여차이침강지간적관계.결과표명,토공효응수변형적증가이발휘;가근재료적설치감소료차이침강,삭약료전토중적토공효응,하재향장정적전체시토공효응화랍막효응공동작용적결과.채용유한원법대장간거、전토고도등미능재모형시험중고필적관건인소진행료삼수민감성분석,총결료토공효응발휘과정적상관규률.근거유한원계산결과、시험수거화문헌중수집도적실측자료,제출용토공효응발휘계수화귀일화위이래묘술토공효응적발휘과정,건의이자지간채용쌍곡선방정모의,종이재설계중체현토공효응수위이적발전,병만족로제전토、가근재료화지기지간적변형협조요구.
@@@@In order to study the development of soil arching in the piled embankment, a series of three-dimensional model tests are conducted. The relationships between stress reduction ratio and ground settlement with different pile cap sizes and different geosynthetic reinforcement materials are analyzed in detail. Based on the test results, it is shown that the effect of soil arching develops gradually with differential settlement and it is more significant at large differential settlement. The inclusion of geosynthetic reinforcements reduces the differential settlement and weakens the soil arching effect correspondingly;and the load transfer from soil to pile top is caused by the combination of soil arching effect and tension membrane effect. The finite element sensitivity analyses are also carried out to study the effects of pile spacing, embankment height and other factors which did not included in the model tests. The focus of numerical analysis are laid on the development process of the soil arching effect and an index is proposed to describe the mobilized degree of the soil arching. Based on the test data, the results of the finite element analyses, and the experimental data collected from literature, a hyperbola equation is suggested to describe the relationship between the mobilized degree of the soil arching and the normalized deformation. The given equation can be used to account the development of soil arching with settlement.