【作者】 陈强； 李驰； 高利平； 郑利；

【Author】 CHEN Qiang;LI Chi;GAO Li-ping;ZHENG Li;The College of Civil Engineering,Inner Mongolia University of Technology;Key Lab.of University of Geological Hazards and Geotechnical Engineering Defense in Sandy,Drought and Cold Regions,Inner Mongolia Autonomous Region;Inner Mongolia highway engineering consulting and Supervision Co.,Ltd.;

【机构】 内蒙古工业大学土木工程学院； 沙旱区地质灾害与岩土工程防御自治区高等学校重点实验室； 内蒙古公路工程咨询监理有限责任公司；

【摘要】 螺旋桩凭借其桩身螺旋叶片与土的相互作用大大提高了基础的稳定性,已经在一些光伏项目中投入使用,但是,季节性冻害对螺旋桩基础产生的影响仍然不可忽视。目前,如何通过改良螺旋桩基础的设计来减缓冻害这一问题仍没有定论。为此,通过一维冻结系统,以差异桩型及不同桩长、桩径的螺旋桩为研究对象,对桩体的抗冻融沉性能进行模型试验研究,结果表明当桩长与桩径一定时,7种不同桩型的桩体在22%与17%两种含水率土体中表现出的抗冻拔融沉性能相一致,下半叶片螺旋桩的抗冻拔融沉效果最好,且增大螺旋叶片也会提高桩体的抗冻拔融沉特性;增加桩长会提升桩体的抗冻拔融沉能力,但将桩长设计为桩径的10倍更具有经济性和适用性,此外,将桩体内外径之比设计为2:5时抗冻拔融沉效果最佳。研究结果为寒区光伏螺旋桩的设计提供基础试验依据。更多还原

【Abstract】 The screw pile has greatly improved the stability of the foundation by virtue of the interaction between the screw blade of the pile body and the soil.It has been put into use in some photovoltaic projects,However,the impact of seasonal freezing damage on the screw pile foundation cannot be ignored.At present,the issue of how to mitigate frost damage by improving the design of screw pile foundations has not been finalized.Therefore,through the one-dimensional freezing system,the model test was carried out on the effects of different pile types,different pile lengths and pile diameters on the frost-pulling resistance of spiral piles.The anti-freeze-thaw-settlement performance of different pile types in soils with 22% and 17% moisture content is consistent.The anti-freeze-thaw-sinking ability of the pile body,but it is more economical and applicable to design the length of the pile to be 10 times the diameter of the pile.In addition,the anti-freeze-thaw-sinking effect when the ratio between the inner and outer diameters of the pile is designed to be 2:5 optimal.The research results provide a basic test basis for the design of photovoltaic screw piles in cold regions.更多还原