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| In-situ test and numerical simulation of the uplift mechanical performance of screw anchor with large anchor plate in silty clay |
| QU Songzhao1，GUO Yonghua2，WANG Yi1，ZHANG Bin2，ZHANG Jianming2，SUN Qing3 |
| (1. School of Civil and Traffic Engineering，Henan University of Urban Construction，Pingdingshan，Henan 467036，China；2. Power China Henan Electric Power Survey and Design Institute Co.，Ltd.，Zhengzhou，Henan 450000，China；
3. School of Human Settlements and Civil Engineering，Xi?an JiaoTong University，Xi?an，Shanxi 710049，China) |
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Abstract In order to study the mechanical performance of the screw anchor foundation with large anchor plate under the uplift load in silty clay area，the static load tests of both single and group anchors are firstly carried out. The influences of the buried depth of single anchor，the number of anchor plates and the inclination angle of single anchors in group anchor on the uplift performance of the foundation are discussed in details. Afterwards，finite element model including soil-foundation interaction is established. Based on the interference analysis of the contact surface，the initial friction between the screw anchor and the soil is applied to FE model. The rationality of the numerical model is verified by comparing the finite element analysis results with the test results. Finally，based on the results of numerical analysis，the change rule of internal force and side friction resistance of the anchor pole，the proportion relationship between the side friction resistance of the anchor pole and the end resistance of the anchor plate to the total pull-up bearing capacity，and the correlation between the pull-up bearing capacity of single anchor and group anchor are analyzed. The results show that the axial load is the main internal force of anchor pole and the side friction increases with the increase of uplift displacement. The load shared by different anchor plates is almost similar，and the load shared by the end resistance of anchor plate accounts for 68%–88% of the total resistance of screw anchor foundation. Meanwhile，the uplift load of group anchor under the same displacement is about three times of that of single anchor.
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2020, Vol. 39 
