中国机械工程
中國機械工程
중국궤계공정
CHINA MECHANICAl ENGINEERING
2014年
15期
2091-2097
,共7页
谭援强%宋军华%张浩%王佳茜%邓熔%杨冬民
譚援彊%宋軍華%張浩%王佳茜%鄧鎔%楊鼕民
담원강%송군화%장호%왕가천%산용%양동민
混凝土泵送%磨损过程%离散单元法%管壁
混凝土泵送%磨損過程%離散單元法%管壁
혼응토빙송%마손과정%리산단원법%관벽
concrete pumping%wear process%discrete element method(DEM)%pipe wall
建立了混凝土离散元模型,并通过 L箱流动实验校核了该模型,得到了计算参数。采用该模型及得到的参数对混凝土泵送过程进行数值模拟,其中,以颗粒对管壁的冲击力和平均力表征壁面磨损程度,对泵送过程中管壁磨损过程进行研究。分析了泵送速度、弯管角度等因素对管壁磨损分布的影响,预测了最易磨损位置。结果表明:弯管管壁磨损随着泵送速度的增大而增大,随着弯管角度的增大而增大,模拟结果与实际泵送过程中观测到的最易磨损位置吻合较好。
建立瞭混凝土離散元模型,併通過 L箱流動實驗校覈瞭該模型,得到瞭計算參數。採用該模型及得到的參數對混凝土泵送過程進行數值模擬,其中,以顆粒對管壁的遲擊力和平均力錶徵壁麵磨損程度,對泵送過程中管壁磨損過程進行研究。分析瞭泵送速度、彎管角度等因素對管壁磨損分佈的影響,預測瞭最易磨損位置。結果錶明:彎管管壁磨損隨著泵送速度的增大而增大,隨著彎管角度的增大而增大,模擬結果與實際泵送過程中觀測到的最易磨損位置吻閤較好。
건립료혼응토리산원모형,병통과 L상류동실험교핵료해모형,득도료계산삼수。채용해모형급득도적삼수대혼응토빙송과정진행수치모의,기중,이과립대관벽적충격력화평균력표정벽면마손정도,대빙송과정중관벽마손과정진행연구。분석료빙송속도、만관각도등인소대관벽마손분포적영향,예측료최역마손위치。결과표명:만관관벽마손수착빙송속도적증대이증대,수착만관각도적증대이증대,모의결과여실제빙송과정중관측도적최역마손위치문합교호。
A discrete element model of fresh concrete was established and validated by L-box flow test of fresh concrete with physical parameters verified.Then the model and obtained parameters were used to simulate the concrete pumping process,where the impact forces on pipe wall were calculated and drawn to stand for the wear situation on the walls,the location of the puncture point was predic-ted.The effect of pumping speed and pipe bend were addressed.The statistic results were validated by comparing the numerical results with an actual broken bend,which indicates that the wear on the pipe wall increases with pumping speed and degree of pipe bend.