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(1 廣東省建筑設(shè)計(jì)研究院有限公司, 廣州 510010; 2 華南理工大學(xué)土木與交通學(xué)院, 廣州 510641)

摘要: 大跨度拱形建筑結(jié)構(gòu)在拱腳處會(huì)產(chǎn)生較大雙向水平推力,因此此類建筑結(jié)構(gòu)的群樁基礎(chǔ)基樁數(shù)量眾多.為研究此類基樁數(shù)量眾多的群樁基礎(chǔ)各排基樁的受力特性,結(jié)合某大跨度拱形建筑,采用三維有限元軟件 PLAXIS3D 建立地基土及群樁基礎(chǔ)模型. 通過(guò)對(duì)不同樁中心間距的矩形布樁群樁基礎(chǔ)計(jì)算各排基樁受到的樁周土體作用力,得到本項(xiàng)目樁中心間距為樁徑的 2.5 倍是較優(yōu)解的結(jié)論. 此外,還得到如下一些可借鑒應(yīng)用于相似項(xiàng)目的有益結(jié)論:基樁數(shù)量眾多的群樁基礎(chǔ)的前兩排基樁及外側(cè)基樁(不包含最后一排內(nèi)部基樁)受到的樁周土體作用力較大,可為群樁基礎(chǔ)提供較大的抗側(cè)剛度;并以此提出一種能高效抵抗拱腳水平推力的工字形布樁群樁基礎(chǔ).

關(guān)鍵詞: 大跨度拱形建筑; 拱腳; 水平推力; 樁中心間距; 矩形布樁群樁基礎(chǔ); 工字形布樁群樁基礎(chǔ)

中圖分類號(hào):TU470+. 3 文獻(xiàn)標(biāo)志碼:A 文章編號(hào):1002-848X(2022)21-0134-05

DOI:10.19701 / j.jzjg.GDAD2219

Application of I-shaped pile group foundation in long-span arch building structure

SU Hengqiang1, CHEN Zhihai1, HE Jun1, HE An2

(1 Guangdong Architectural Design & Research Institute Co. , Ltd., Guangzhou 510010, China;2 School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510641, China)

Abstract:The large-span arch building structure generates a large two-way horizontal thrust at the arch foot, so the numberof foundation piles of this type building structure is large. In order to study the mechanical characteristics of each row ofpiles in pile group foundations with a large number of piles, combined with a large-span arched building, thethree-dimensional finite element software PLAXIS 3D was used to establish the foundation soil and pile group foundationmodel. By calculating the soil force around the piles received by each row of foundation piles for the rectangular pile groupfoundations with different pile center distance, it is concluded that the optimal solution is the pile center distance of 2.5times the pile diameter in this project. In addition, the following useful conclusions can be drawn and applied to similarprojects: the first two rows of foundation piles and the outer foundation piles (excluding the inner piles in the last row) ofpile group foundations with a large number of piles are subjected to large soil forces around the piles, which can provide alarge lateral stiffness for the pile group foundations. Based on this, an I-shaped pile group foundation which can effectivelyresist the horizontal thrust of arch foot was proposed.

Keywords:long-span arch building; arched feet; horizontal thrust; pile center distance; rectangular pile group foundation;I-shaped pile group foundation

∗廣東省基礎(chǔ)與應(yīng)用基礎(chǔ)研究基金聯(lián)合基金-青年基金項(xiàng)目(2021A1515110109).

第一作者:蘇恒強(qiáng),碩士,廣東省工程勘察設(shè)計(jì)大師,教授級(jí)高級(jí)工程師,主要從事工程抗震研究,Email:shq@ gdadri. com.

[引用本文] 蘇恒強(qiáng),陳志海,何軍,等. 工字形布樁群樁基礎(chǔ)在大跨度拱形建筑結(jié)構(gòu)中的應(yīng)用[ J]. 建筑結(jié)構(gòu),2022,52(21):134-138. SU Hengqiang,CHEN Zhihai,HE Jun,et al. Application of I-shaped pile group foundation inlong-span arch building structure[J]. Building Structure,2022,52(21):134-138.