CAJ | 학술논문

采用三维无厚度横缝单元模拟施工期混凝土坝横缝开合行为,采用Newton-Raphson迭代法和预处理共轭梯度法计算,开发了横缝开度仿真计算程序,进行了向家坝相邻两坝块对横缝开度贡献度大小的分析。选取4种相邻高差,分别是横缝相邻高差为12 m、18 m、24 m、30 m,计算各工况下横缝开度,绘制典型点横缝开度过程线、横缝左右点位移过程线、横缝开度云图等,整理了相邻坝块高差、相邻坝块温度过程差异、一期控温、二期降温等因素对横缝开度的影响。计算结果表明：二期温降对横缝张开贡献大；先浇块对横缝开度贡献更大,且前期温度差异阶段越长,先浇块对缝宽贡献越大。
채용삼유무후도횡봉단원모의시공기혼응토패횡봉개합행위,채용Newton-Raphson질대법화예처리공액제도법계산,개발료횡봉개도방진계산정서,진행료향가패상린량패괴대횡봉개도공헌도대소적분석。선취4충상린고차,분별시횡봉상린고차위12 m、18 m、24 m、30 m,계산각공황하횡봉개도,회제전형점횡봉개도과정선、횡봉좌우점위이과정선、횡봉개도운도등,정리료상린패괴고차、상린패괴온도과정차이、일기공온、이기강온등인소대횡봉개도적영향。계산결과표명：이기온강대횡봉장개공헌대；선요괴대횡봉개도공헌경대,차전기온도차이계단월장,선요괴대봉관공헌월대。
This paper adopts the 3D joint element to simulate concrete dam transverse joint during the opening act;it uses the Newton-Raphson iterative method and preprocessing conj ugate gradient method to calculate. A joint opening simulation program is developed;and the margin of contribution of the adjacent two dam block joints of Xiangjiaba to contraction opening is analyzed.We choose four kinds of adjacent level differ-ences;they are respectively 12 m,18 m,and 24 m,30 m for the joints adjacent level,calculating the joints o-pening under different conditions and drawing the process line of typical point j oints opening and transverse j oints aperture point displacement as well as the picture of opening j oints.We also analyzed the factors that influence contraction j oints opening such as adj acent difference,temperature process differences,the first pe-riod of temperature control and second stage cooling of it.The calculation results show that the second phase of temperature drop influences more on joints opening;first poured pieces contribute more to the joints open-ing and the longer the temperature difference between the stages,the bigger contribution of the first poured pieces will do to the width of the j oints.