人民黄河
人民黃河
인민황하
Yellow River
2014年
7期
124-127
,共4页
离散元法%碾压试验%数值模拟%孔隙率
離散元法%碾壓試驗%數值模擬%孔隙率
리산원법%년압시험%수치모의%공극솔
discrete element method%compaction test%numerical simulation%porosity
利用离散元方法对颗粒土碾压试验进行了仿真数值模拟分析。针对静力碾压，展示了与现场碾压试验一致的数值模拟结果，分析了碾压遍数和孔隙率的关系。进一步通过数值模拟研究了在碾压遍数相同的情况下，碾压速度、颗粒土层厚度等因素对碾压效果的影响。结果表明：采用的数值模拟方法可以作为现场碾压试验的补充，用于研究压实机理、分析碾压效果、了解各种因素的影响；仿真模拟能得到与现场试验相一致的碾压遍数与孔隙率之间的关系；颗粒土的压实效果，不仅与碾压遍数有关，而且受碾压速度的影响，较慢的碾压速度可以获得较好的压实效果；在颗粒土料层较厚的情况下，厚度方向碾压接触力分布并不均匀，上层土料会较早达到预定密实度，在实际碾压施工中，若土料层较厚，要多碾压1~2遍，才能确保下层土料也能达到预定密实度。
利用離散元方法對顆粒土碾壓試驗進行瞭倣真數值模擬分析。針對靜力碾壓，展示瞭與現場碾壓試驗一緻的數值模擬結果，分析瞭碾壓遍數和孔隙率的關繫。進一步通過數值模擬研究瞭在碾壓遍數相同的情況下，碾壓速度、顆粒土層厚度等因素對碾壓效果的影響。結果錶明：採用的數值模擬方法可以作為現場碾壓試驗的補充，用于研究壓實機理、分析碾壓效果、瞭解各種因素的影響；倣真模擬能得到與現場試驗相一緻的碾壓遍數與孔隙率之間的關繫；顆粒土的壓實效果，不僅與碾壓遍數有關，而且受碾壓速度的影響，較慢的碾壓速度可以穫得較好的壓實效果；在顆粒土料層較厚的情況下，厚度方嚮碾壓接觸力分佈併不均勻，上層土料會較早達到預定密實度，在實際碾壓施工中，若土料層較厚，要多碾壓1~2遍，纔能確保下層土料也能達到預定密實度。
이용리산원방법대과립토년압시험진행료방진수치모의분석。침대정력년압，전시료여현장년압시험일치적수치모의결과，분석료년압편수화공극솔적관계。진일보통과수치모의연구료재년압편수상동적정황하，년압속도、과립토층후도등인소대년압효과적영향。결과표명：채용적수치모의방법가이작위현장년압시험적보충，용우연구압실궤리、분석년압효과、료해각충인소적영향；방진모의능득도여현장시험상일치적년압편수여공극솔지간적관계；과립토적압실효과，불부여년압편수유관，이차수년압속도적영향，교만적년압속도가이획득교호적압실효과；재과립토료층교후적정황하，후도방향년압접촉력분포병불균균，상층토료회교조체도예정밀실도，재실제년압시공중，약토료층교후，요다년압1~2편，재능학보하층토료야능체도예정밀실도。
Through the discrete element method,grained soil compaction tests were carried out numerical simulation analysis. According to the static rolling,it demonstrated consistent with the field test results of numerical simulation and analyzed the relationship between the rolling times and porosi-ty. It studied the influence of rolling speed and the particles of soil thickness under the same conditions of rolling times to the rolling effect through further numerical simulation. The results show that the numerical simulation method can be used as a field compaction test supplements compaction mechanism for research,analysis rolling effect,to understand the impact of various factors;simulation can be consistent with the field test rolled sev-eral times relationship between porosity;compaction of soil particles,not only with rolling times,but also to the affected rolling speed,slow rolling speed can get better compaction;granular soil material in the case of a thicker layer,the thickness direction of the rolling contact force is not evenly distributed,the upper soil material will be earlier reached a predetermined density,rolling in the actual construction,if the soil material layer is thic-ker,it should be compacted 1 -2 times more. Thus it can ensure the subsoil compaction material reaching to the predetermined degree.
