苏夏征, 程峰, 谢廷勇. 2022. 工程渣土场回填土的力学性能及扩容分析[J]. 工程地质学报, 30(4): 1059-1068. doi: 10.13544/j.cnki.jeg.2020-063.
    引用本文: 苏夏征, 程峰, 谢廷勇. 2022. 工程渣土场回填土的力学性能及扩容分析[J]. 工程地质学报, 30(4): 1059-1068. doi: 10.13544/j.cnki.jeg.2020-063.
    Su Xiazheng, Cheng Feng, Xie Tingyong. 2022. Mechanical properties and capacity expansion analysis of backfill soil in engineering muck field[J]. Journal of Engineering Geology, 30(4): 1059-1068. doi: 10.13544/j.cnki.jeg.2020-063.
    Citation: Su Xiazheng, Cheng Feng, Xie Tingyong. 2022. Mechanical properties and capacity expansion analysis of backfill soil in engineering muck field[J]. Journal of Engineering Geology, 30(4): 1059-1068. doi: 10.13544/j.cnki.jeg.2020-063.

    工程渣土场回填土的力学性能及扩容分析

    MECHANICAL PROPERTIES AND CAPACITY EXPANSION ANALYSIS OF BACKFILL SOIL IN ENGINEERING MUCK FIELD

    • 摘要: 工程渣土填埋场由于缺乏合理的库容设计,导致场地库容利用率较低,当前所采用的简单倾倒措施也会引发崩塌、滑坡等安全隐患。为探索合理填埋方法,增大填埋容量,防止安全事故发生。本文对梧州市龙圩区李家坳堆填4年的渣土场库容利用情况进行了研究,通过原位试验、室内试验及测试结果分析,研究了工程渣土的力学性能指标特征;通过三维地质建模并结合LANDFILL程序对填埋过程中进行了仿真模拟,采用LANDFILL软件与Sowers固结模型计算对场地沉降与容量变化进行了对比分析。结果表明:(1)工程渣土由于扰动性大,导致其组分不均,土体多处于半饱和-饱和状态,主要以含砂细粒土(CLS)、低液限黏土(CL)两种土为主;(2)工程渣土多处于流塑状态、软塑状态,压实度低,平均地基承载力较低;(3)填埋过程仿真分析结果表明填坑在完善排水措施、改进填埋工艺后,可使扩容率由8.9%增加到25.1%,能有效提高填埋场的容量;(4)LANDFILL软件沉降计算结果与模型相比,误差值较小,平均误差小于4.5%,表明LANDFILL软件计算填埋场沉降更符合实际。研究结果为工程渣土场的扩容设计、安全运营、填埋施工等提供了数据参考及工程借鉴。

       

      Abstract: The unreasonable storage capacity design can lead to a low utilization rate of site storage capacity. The simple dumping measures adopted at present would also cause potential safety hazards such as collapse and landslide. This paper aims to explore reasonable landfill method,increase landfill capacity and prevent safety accidents. This paper studies the capacity utilization of Lijia'ao landfill site in Longwei District of Wuzhou City for 4 years. The mechanical properties of engineering muck are studied by in-situ test and laboratory test. The process of filling is simulated by 3D geological modeling and LANDFILL. The site is calculated by LANDFILL and Sowers consolidation model. The settlement and capacity change are compared and analyzed. The results show that:(1)the composition of engineering muck is uneven due to the large disturbance,and are mainly composed of sandy fine grain soil(CLS) and low liquid limit clay(CL)in the half-saturated and-saturated states; (2)the engineering muck are mostly in fluid-plastic state and soft-plastic state,with low compacting degree and low average foundation bearing capacity; (3)the simulation results show that the expansion rate can be increased from 8.9%to 25.1%after the drainage measures and the landfill technology are improved. The capacity can be effectively improved; (4)compared with the model,the error value of landfill software settlement calculation is smaller,and the average error is less than 4.5%,which shows that the calculation of landfill settlement by LANDFILL is more practical. The research results provide both data and engineering references for the expansion design,safe operation and landfill construction of engineering muck field.

       

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