综合精品_淫语对白_亚洲一线二线在线观看_自偷自拍av_女m被主人虐玩调教91_青草精品视频_一乃葵在线_村上里沙在线观看_国产精品刺激_日韩精品视频免费_国产又黄又猛又粗_3d蒂法精品啪啪一区二区免费_日韩一本在线_奇米精品一区二区三区四区_日本三级黄色录像

吳冬健1,  葉若豪2,  張浩2

(1 . 江蘇省巖土工程公司，江蘇 南京 210019; 

2 江蘇省南京工程高等職業(yè)學(xué)校，江蘇 南京 211135)

摘 要：鉆孔灌注樁為研究樁端后注漿承載特性及影響因素，依托某鉆孔灌注樁橋梁基礎(chǔ)工程，通過(guò)現(xiàn)場(chǎng)單樁靜載荷試驗(yàn)分析了樁的沉降特性以及軸力和側(cè)摩阻力分布規(guī)律，并基于有限元方法分析了不同注漿量和注 漿體強(qiáng)度對(duì)樁端后注漿灌注樁承載力的影響，結(jié)果表明： 樁軸力隨深度的增大而逐漸減小， 隨著施加荷載的逐漸增大，樁端荷載承擔(dān)比例不斷增大；樁側(cè)摩阻力大致呈現(xiàn)“R ”型分布，試樁下半部分的側(cè)摩阻力明顯增大， 樁端后注漿工藝在樁端附近產(chǎn)生了側(cè)阻強(qiáng)化效應(yīng)；隨著樁端擴(kuò)大頭半徑和彈性模量的增大，樁的承載力和承載力提高比均不斷增大，當(dāng)樁端擴(kuò)大頭半徑小于1m或樁端擴(kuò)大頭彈性模量小于2000MPa時(shí)，承載力提高比增幅較大；隨著樁長(zhǎng)的增大，普通灌注樁和樁端后注漿灌注樁的承載力和沉降值均呈現(xiàn)不斷增大的趨勢(shì)，且樁長(zhǎng)越短，后壓漿工藝對(duì)灌注樁承載力的提高比例越大。

關(guān)鍵詞：鉆孔灌注樁；后注漿；承載力；數(shù)值模擬

中圖分類號(hào)：TU473 . 1 

文獻(xiàn)標(biāo)志碼：A 

文章編號(hào)：1005- 8249 (2024) 03- 0073- 06 

DOI：10.19860/j.cnki.issn1005-8249.2024.03.015

WU Dongjian1 ,  YE Ruohao2,  ZHANG Hao2

1. Jiangsu Geotechnical Engineering Co. ，Ltd. ，Nanjing 210019 , China;

2. Jiangsu Province Nanjing Engineering Vocational College , Nanjing 211135, China

Abstract : In order to study the bearing characteristics and influencing factors of post grouting bored pile at the pile end , this article relies on a bridge foundation project using a composite post grouting technology at the pile end. Through on - site single pile static load tests, the settlement characteristics of the pile , as well as the distribution of axial force and lateral friction resistance , were analyzed. Based on the finite element method, the influence of different grouting amounts and grouting body strength on the bearing capacity of post grouting bored pile at the pile end was analyzed , The following conclusion is drawn : The axial force of the pile gradually decreases with the increase of depth , and the proportion of pile end load bearing continuously increases with the gradual increase of applied load. The lateral friction resistance of the pile roughly presents an“R ” distribution, and the lateral friction resistance in the lower part of the test pile significantly increases. The post grouting process at the pile end has produced a strengthening effect on the lateral resistance near the pile end. As the radius and elastic modulus of the pile end expand , the bearing capacity and bearing capacity improvement ratio of the pile continue to increase. When the radius of the pile end expand is less than 1 m or the elastic modulus of the pile end expand is less than 2 000 MPa, the bearing capacity improvement ratio increases significantly. As the pile length increases , the bearing capacity and settlement values of ordinary cast - in - place piles and post grouting cast - in - place piles at the pile end show a continuous increasing trend, and the shorter the pile length,the greater the proportion of improvement in the bearing capacity of cast - in - place piles by post grouting technology. 

Keywords : bored pile; post grouting at the pile end; bearing characteristics; numerical calculation

作者簡(jiǎn)介：吳冬健 (1979—) , 男，本科，高級(jí)工程師，研究方向：巖土工程施工、勘察等。

收稿日期：2023-08-10