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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學校，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工程，通過現場單樁靜載荷試驗分析了樁的沉降特性以及軸力和側摩阻力分布規律，并基于有限元方法分析了不同注漿量和注 漿體強度對樁端后注漿灌注樁承載力的影響，結果表明： 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，樁端荷載承擔比例不斷增大；樁側摩阻力大致呈現“R ”型分布，試樁下半部分的側摩阻力明顯增大， 樁端后注漿工藝在樁端附近產生了側阻強化效應；隨著樁端擴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，當樁端擴大頭半徑小于1m或樁端擴大頭彈性模量小于2000MPa時，承載力提高比增幅較大；隨著樁長的增大，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不斷增大的趨勢，且樁長越短，后壓漿工藝對灌注樁承載力的提高比例越大。

關鍵詞：鉆孔灌注樁；后注漿；承載力；數值模擬

中圖分類號：TU473 . 1 

文獻標志碼：A 

文章編號：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

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

收稿日期：2023-08-10