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水平荷載下承力盤位置對新型混凝土擴盤樁彎曲型 破壞狀態(tài)影響研究
羅立強1 , 錢永梅1 , 洪 光2 , 牛 雷1 , 劉家良1
摘 要

(1 吉林建筑大學土木工程學院, 長春 130118;2 中國電力工程顧問集團東北電力設(shè)計院有限公司, 長春 130022)

摘要: 承力盤參數(shù)對新型混凝土擴盤樁(NT?CEP 樁)的承載性能具有一定影響,其中承力盤位置在 NT?CEP 樁抵抗水平荷載時較為重要。 采用半截面樁小模型原狀土試驗方法對 4 個承力盤頂部到樁頂?shù)木嚯x分別為 50、90、130、170mm 的 NT?CEP 樁進行了試驗,采用 ANSYS 有限元軟件對 7 個承力盤頂部到樁頂距離分別為1 500、2 100、2 700、3 300、3 900、4 500、5 100mm 的 NT?CEP 樁進行了模擬。 對比分析了水平荷載作用下 NT?CEP 樁不同承力盤位置對樁周土體破壞狀態(tài)以及 NT?CEP 樁抗傾覆能力的影響,確定水平荷載作用下承力盤位置對 NT?CEP 樁承載力的影響規(guī)律:承力盤距離樁頂越近,NT?CEP 樁抵抗水平荷載能力越強。 最后,根據(jù)試驗和模擬結(jié)果,完善了 NT?CEP 樁在水平荷載作用下的計算公式,為 NT?CEP 樁在實際工程中的應(yīng)用及設(shè)計提供了可靠的理論基礎(chǔ)。

關(guān)鍵詞: 新型混凝土擴盤樁; 水平荷載; 承力盤位置; 彎曲型破壞; 樁周土體破壞狀態(tài)

中圖分類號:TU473?? 1 文獻標志碼:A 文章編號:1002?848X(2022)12?0134?05

 

DOI:10. 19701 / j. jzjg. LS210215

 

Research on influence of bearing plate position on bending failure state of new type concrete

expansion plate pile under horizontal load

LUO Liqiang1, QIAN Yongmei1, HONG Guang2, NIU Lei1, LIU Jialiang1

(1 College of Civil Engineering, Jilin Jianzhu University, Changchun 130118, China; 2 Northeast Electric PowerDesign Institute Co., Ltd. of China Power Engineering Consulting Group, Changchun 130022, China)

Abstract: The parameters of the bearing plate have a certain influence on the bearing performance of the new type concreteexpansion plate pile, and the position of the bearing plate is important when the NT?CEP pile resists horizontal loads. The semi?section pile small model undisturbed soil test method was used to stimulate four NT?CEP piles with the distance from the top of bearing plate to the top of pile ranging from 50, 90, 130 to 170mm respectively. The ANSYS finite element software was used to stimulate seven NT?CEP piles, with the distance from the top of bearing plate to the top of pile ranging from 1500, 2100, 2700, 3300, 3900, 4500 to 5100mm respectively. The effect of different bearing plate positions of NT?CEP piles on the failure state of soil around the piles and the anti?overturning ability of NT?CEP piles under horizontal loads were compared and analyzed, and the influence law of bearing plate position on the bearing capacity of NT?CEP piles under horizontal loads was determined: the closer the bearing plate is to the pile top is, the stronger the ability of NT?CEP pile is to resist horizontal load. Finally, according to the test and simulation results, the calculation formula of NT?CEP pile under horizontal loads was improved, which provided a reliable theoretical basis for the application and design of NT?CEP pile in practical engineering.

Keywords:new type concrete expansion plate pile; horizontal load; position of bearing plate; bending failure; failure stateof soil around pile

∗吉林省科技廳人才專項項目(20210509042RQ)。第一作者:羅立強,碩士研究生,主要從事新型樁基礎(chǔ)研究,Email:649215300@ qq.com。通信作者:錢永梅,博士,教授,主要從事土木工程專業(yè)的科研和教學工作,Email:654675316@ qq.com。

[引用本文] 羅立強,錢永梅,洪光,等. 水平荷載下承力盤位置對新型混凝土擴盤樁彎曲型破壞狀態(tài)影響研究[J]. 建筑結(jié)構(gòu),2022,52( 12):134?138. LUO Liqiang,QIAN Yongmei,HONG Guang,et al. Research on influence ofbearing plate position on bending failure state of new type concrete expansion plate pile under horizontal load[J]. BuildingStructure,2022,52(12):134?138.
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