掏挖式铁塔基础承载力及基础造价影响参数分析  

Analysis on Influence Factors of Bearing Capacity and Foundation Cost of Excavation Tower Foundation

作　　者：赵玉慧 孙晓骥 徐捷 闵祥兵 

机构地区：[1]西安长庆科技工程有限公司

出　　处：《油气田地面工程》2017年第11期17-20,共4页Oil-Gas Field Surface Engineering

摘　　要：长庆油田输变电项目主要位于陕、甘、宁地区,地质条件以湿陷性黄土为主,铁塔数量多,综合造价高。结合黄土的特殊土力学性能,为节约工程投资,减少油田工程建设对自然环境的破坏,线路铁塔基础多采用掏挖式基础。由于掏挖式基础尺寸是影响基础上拔和下压承载力的主要因素,当承载力一定时,基础尺寸不同导致造价差异较大,因此,结合工程实践,通过大量计算,对铁塔基础的尺寸参数进行了分析。通过分析可知,影响上拔承载力的主要因素由大到小分别为基础主柱高度、基础扩底高度、基础扩底宽度及主柱直径,其中增加基础主柱高度的综合造价低于增加其他基础尺寸的综合造价,经济性更好,建议设计铁塔基础宜优先增加主柱高度提高上拔承载力。The power transmission and transformation project of Changqing Oilfield is mainly located in Shanxi,Gansu and Ningxia,in which the geological condition are mostly collapsible loess.Combined with the special soil mechanical properties of loess,and in order to save project investment and reduce the damage to natural environment caused by oilfield project construction,the line tower foundation usually adopts the excavation foundation.The size of the excavation foundation is the main factor that affects the uplift bearing capacity and downward-pressure bearing capacity.When the bearing capacity is constant,different foundation sizes leads to great difference in cost.Therefore,combining with engineering practice and through massive calculation,the size parameter of the tower foundation is analyzed.The analysis shows that the main factors influencing uplift bearing capacity are basic column height,basic enlarged bottom height,basic enlarged bottom width and main column diameter,and the overall cost of increasing the height of the main column is lower than that of increasing others.It is suggested that increasing the height of main column should be given priority to improve uplift bearing capacity in the design of tower foundation.

关 键 词：掏挖式基础 上拔承载力 下压承载力 扩底尺寸 基础造价 

分 类 号：TM75[电气工程—电力系统及自动化]