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(1 寧夏寧電電力設(shè)計有限公司, 銀川 750001; 2 西安交通大學(xué)土木工程系, 西安 710054)
摘要: 微型樁因其受力性能好及施工優(yōu)勢逐漸應(yīng)用于輸電線路桿塔基礎(chǔ),但群樁基礎(chǔ)承載性能的研究相對較少?；邳S土地基微型群樁現(xiàn)場靜載試驗,研究了樁數(shù)和樁間距對微型群樁抗拔承載性能的影響;并建立了精細化有限元模型,進行了極限承載力分析。 通過與試驗結(jié)果對比,驗證了有限元模型的合理性,在此基礎(chǔ)上分析了樁間距、樁傾角對微型群樁抗拔承載性能的影響。 結(jié)果表明:隨著樁數(shù)、樁間距及樁傾角增加,微型群樁抗拔承載力均表現(xiàn)出不同程度的提高。 結(jié)合試驗和有限元分析可得黃土地基微型群樁的樁間距建議值 4d,樁傾角建議值 10°,群樁抗拔效應(yīng)系數(shù)建議值 0. 80。
關(guān)鍵詞: 微型群樁; 靜載試驗; 數(shù)值模擬; 抗拔承載性能; 樁間距; 樁傾角; 群樁效應(yīng)
中圖分類號:TU473 文獻標(biāo)志碼:A 文章編號:1002-848X(2022)24-0120-06
DOI:10. 19701 / j. jzjg. 20211538
Study on uplift bearing capacity and group pile effect of micro-pile group in loess foundation
ZHANG Aijun1, FU Hongan1, WANG Jiajia2, WANG Xueping1, TIAN Shuai1, SUN Qing2
(1 Ningxia Ningdian Power Design Institute Co. , Ltd. , Ningxia 750001, China; 2 Department of Civil Engineering,Xi'an Jiaotong University, Xi’ an 710054, China)
Abstract: The micro-pile has gradually been applied to the foundation of transmission line tower due to its good mechanicalperformance and construction advantages, but the bearing performance of pile group is relatively little researched. Based onthe field static load test of the micro-pile group in loess foundation, the influence of the number of piles and the distancebetween the piles on the uplift bearing performance of the micro-pile group were studied. And a refined finite element modelwas established to carry out analysis of the ultimate bearing capacity. By comparing with the test results, the reasonablenessof the finite element model was verified, and on this basis, the influence of pile spacing and pile inclination angle on theuplift bearing performance of micro-pile group was analyzed. The results show that with the increase of the number of piles,pile spacing and pile inclination angle, the uplift bearing capacity of micro-pile groups shows different degrees ofimprovement. According to the results of experiment and numerical simulation, the recommended values of pile spacing,pile inclination angle and anti-pull effect coefficient of micro-pile group in loess foundation are 4d, 10° and 0. 80respectively.
Keywords:micro-pile group; static test; numerical simulation; uplift bearing capacity; pile spacing; pile inclination; pilegroup effect
∗國家自然科學(xué)基金(51978570)。
第一作者:張愛軍,學(xué)士,高級工程師,主要從事輸電線路桿塔基礎(chǔ)設(shè)計工作,Email:zzz_70_70@ sohu. com。
[引用本文] 張愛軍,付紅安,王佳佳,等. 黃土地基微型群樁抗拔承載力及群樁效應(yīng)研究[J]. 建筑結(jié)構(gòu),2022,52(24):120-125. ZHANG Aijun,FU Hongan,WANG Jiajia,et al. Study on uplift bearing capacity and group pile effect ofmicro-pile group in loess foundation[J]. Building Structure,2022,52(24):120-125.
