软土地区建筑垃圾堆山工程的数值模拟研究

Numerical simulation study on artificial hill with construction waste in soft soil area

针对某典型软土地区堆山工程,使用有限元软件Plaxis,对建筑垃圾堆山和场区现有粘性土堆山进行了仿真模拟。通过数值模拟结果得出了不同填料堆山时堆载体位移和地基差异沉降量。研究了不同填料堆山时的地基稳定性以及不同填料堆土角度和安全系数的关系,同时对地基加固处理的效果进行了分析。研究结果表明,建筑垃圾堆载体的水平位移和沉降量更小,地基稳定性要显著优于粘性土堆载体,建筑垃圾堆山的极限堆土角度更大,但建筑垃圾堆山会产生较大的地基不均匀沉降。进一步将研究得到的结论应用于工程实例分析,为实际工程设计方案的制定、施工进度的控制提供了帮助,并且模拟结果和实际工程吻合良好,表明土体的本构模型和参数选取合理。研究方法和结论可以为更多类似的工程所借鉴。

In this paper,for a typical heaping hill engineering in soft soil area,the finite element software Plaxis is used to simulate the hill made up of construction waste and the hill made up of existing cohesive soil.Through numerical simulation results,the stacked objects displacement and the foundation uneven settlement under the above two different conditions are obtained.The foundation stability and the relationship between soil filling angle and the safety factor under the above two different conditions is studied.At the same time,influence of foundation consolidation treatment is analyzed.Research results show that the horizontal displacement and settlement of the stacked objects made up of construction waste are smaller.The foundation stability of it is significantly better than that of the stacked objects made up of cohesive soil and its limit stacking soil angle is larger.But it will cause a greater foundation uneven settlement.The conclusions obtained from the research are further applied to the analysis of engineering examples,which aids with the formulation of the actual engineering design scheme and the control of the construction schedule.The simulation results are in good agreement with the actual engineering,indicating that the constitutive model and parameters of the soil are selected reasonably.The research methods and conclusions can be used as reference in more similar projects.