CAJ | 학술논문

实际工程中，土体由自重产生的压缩变形而形成的初始地应力场，是在土体完成固结之后形成的，用有限元法进行桩土共同作用数值模拟时往往会忽略初始地应力的影响，因此，模拟结果与实际情况存在一定的差异。本文利用 ANSYS 中的接触单元建立桩土共同作用的数值模型，通过读入作用在桩顶的垂直荷载形成载荷步文件减去土体在自重作用下的应力场来模拟初始地应力。通过该方法分析了桩顶受荷时的沉降及竖向应力，得出了桩和土体的特性对桩基沉降影响的一般规律。模拟数值与实测数据的对比结果表明，利用接触单元进行桩土共同作用的分析方法是可行的。
실제공정중，토체유자중산생적압축변형이형성적초시지응력장，시재토체완성고결지후형성적，용유한원법진행장토공동작용수치모의시왕왕회홀략초시지응력적영향，인차，모의결과여실제정황존재일정적차이。본문이용 ANSYS 중적접촉단원건립장토공동작용적수치모형，통과독입작용재장정적수직하재형성재하보문건감거토체재자중작용하적응력장래모의초시지응력。통과해방법분석료장정수하시적침강급수향응력，득출료장화토체적특성대장기침강영향적일반규률。모의수치여실측수거적대비결과표명，이용접촉단원진행장토공동작용적분석방법시가행적。
In actual engineering, the impact of initial stress field will be ignored when using the finite element method to simulate the pile-soil interaction, while the deformation of soil by the gravity effect has already been finished actually, so there is the difference. In this paper, the contact element of ANSYS establish a numerical model of pile-sol interaction system which minus the weight of the soil compression stress caused by a variety of vertical load to simulate the initial stress field. It is indicated that this method can be used to analyze the top load of the pile settlement and vertical stress, draw the characteristics of the soil piles and pile settlement affect the general rule. Compared with the meterage results, the numerical simulation results show that, it is feasible to use the load step of ANSYS for considering the initial stress of the soil.