- 摘 要
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(1 廣州市建筑科學(xué)研究院有限公司, 廣州 510440; 2 廣州建設(shè)工程質(zhì)量安全檢測(cè)中心有限公司,廣州 510440; 3 華南理工大學(xué)土木與交通學(xué)院, 廣州 510641)
摘要: 為研究樁基承載力高應(yīng)變法和靜載法的檢測(cè)差異,收集工程現(xiàn)場(chǎng) 76 根 PHC 管樁的高應(yīng)變法和靜載法檢測(cè)結(jié)果進(jìn)行對(duì)比。 以靜載法的承載力檢測(cè)結(jié)果為基準(zhǔn),對(duì)比分析引起高應(yīng)變法承載力檢測(cè)誤差的主要原因,探討以樁基高應(yīng)變法檢測(cè)結(jié)果推算樁基靜載法檢測(cè)結(jié)果的可行性。 結(jié)果表明:約 84?? 2%檢測(cè)樁的高應(yīng)變法承載力誤差控制在±10%以內(nèi),且高應(yīng)變法承載力結(jié)果大于或小于靜載法承載力結(jié)果的概率相當(dāng),無(wú)明顯偏向性;對(duì)于緩變型短樁,高應(yīng)變法樁頂沉降主要分布在 10~ 20mm 范圍內(nèi),對(duì)應(yīng)的靜載法樁頂沉降分布范圍為 10 ~ 40mm;采用線性函數(shù)模型擬合高應(yīng)變法和靜載法樁頂陡降型沉降曲線是合適的,相關(guān)系數(shù)達(dá) 0?? 86 以上。 根據(jù)荷載?沉降曲線特點(diǎn)、樁長(zhǎng)徑比、樁端持力層條件進(jìn)行樁基分類后,再采用高應(yīng)變法結(jié)果預(yù)測(cè)靜載法結(jié)果,預(yù)測(cè)準(zhǔn)確度更好。
關(guān)鍵詞: PHC 管樁; 高應(yīng)變法; 靜載法; 承載力; 樁頂沉降
中圖分類號(hào):TU398?? 7 文獻(xiàn)標(biāo)志碼:A 文章編號(hào):1002?848X(2022)14?0136?05
DOI:10?? 19701 / j?? jzjg?? 20200829
Comparative study on vertical compressive bearing behavior of PHC pipe piles based on highstrain method and static load method
LIU Chunlin1,2,3, TANG Mengxiong1,2, HU Hesong 1,2, CHEN Hang1, LIU Chenxi2, HOU Zhenkun1,2,3
(1 Guangzhou Institute of Building Science Co. , Ltd. , Guangzhou 510440, China; 2 Guangzhou Testing Centre ofConstruction Quality and Safety Co. , Ltd. , Guangzhou 510440, China; 3 School of Civil Engineering and Transportation,South China University of Technology, Guangzhou 510641, China)
Abstract: In order to study the detection difference between the high strain method and the static load method for the bearing capacity of the pile foundation, detection results of 76 PHC pipe piles at the project site with high strain method and static load method were collected for comparison. Based on the bearing capacity detection results of the static load method, the maincauses of the bearing capacity detection errors by using the high strain method were compared and analyzed, and thefeasibility of using the detection results of high strain method to estimate to the detection results of static load method for thepile foundation was discussed. The results show that high strain method bearing capacity detection error of PHC pipe pilesabout 84?? 2% is controlled within ±10%, the probability of the dynamic strain result being greater than or less than the staticload result is equivalent, and there is no obvious bias. For short piles with slowly changing load?settlement curves, the piletop settlement with high strain method mainly changes within the range of 10 to 20mm, and the corresponding the pile topsettlement with static load method vary from 10 to 40mm. The linear function model is suitable to fit the steep?decliningsettlement curve of pile top based on high strain method and static load method, and the correlation coefficient is above 0?? 86.before using the high strain results to estimate the static load results, pile foundations must be firstly classified according tothe characteristics of the load?settlement curve, the length?to?diameter ratio of piles and the pile end bearing layer, which willresult in higher prediction accuracy.
Keywords:PHC pipe pile; high strain method; static load method; bearing capacity; pile top settlement
∗國(guó)家自然科學(xué)基金項(xiàng)目(51908225),廣州市建筑集團(tuán)科技計(jì)劃項(xiàng)目(2020?KJ002、2020?KJ007、2021?KJ022),廣州市建筑科學(xué)研究院科技進(jìn)步項(xiàng)目(2021Y?KJ04、2020Y?KJ05)。第一作者:劉春林,博士,博士后,主要從事地基基礎(chǔ)檢測(cè)與監(jiān)測(cè)方面的研究工作,Email: liuchunlin2007@ 163. com。通信作者:唐孟雄,博士,教授級(jí)高級(jí)工程師,一級(jí)注冊(cè)土木工程師(巖土),主要從事巖土工程方面的研究工作,Email:tmx@ gibs. com. cn。[引用本文] 劉春林,唐孟雄,胡賀松,等. PHC 管樁豎向抗壓承載性狀高應(yīng)變法和靜載法對(duì)比研究[J]. 建筑結(jié)構(gòu),2022,52(14):136?140. LIU Chunlin,TANG Mengxiong,HU Hesong,et al. Comparative study on vertical compressive bearingbehavior of PHC pipe piles based on high strain method and static load method[J]. Building Structure,2022,52(14):136?140.
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