- 摘 要
-
(1 西南交通大學(xué)土木工程學(xué)院， 成都 611756； 2 中國石油天然氣華東勘察設(shè)計(jì)研究院巖土工程處， 青島 266071； 3 中鐵第五勘察設(shè)計(jì)院集團(tuán)有限公司， 北京 102600；4 淮海工學(xué)院土木與港海工程學(xué)院， 連云港 222005)
［摘要］針對(duì)大型煉廠工程軟弱地基處理的復(fù)雜性，完成了不同樁徑、是否嵌巖條件下水平、抗壓及抗拔鉆孔灌注樁的現(xiàn)場試驗(yàn)，試驗(yàn)內(nèi)容包括鉆孔灌注樁施工后的低應(yīng)變動(dòng)力檢測、鉆芯試驗(yàn)、樁身內(nèi)力測試及單樁靜載荷試驗(yàn)?；诘蛻?yīng)變動(dòng)力檢測和鉆芯試驗(yàn)結(jié)果，分析了樁身質(zhì)量及完整性；通過大量樁身內(nèi)力測試結(jié)果，詳細(xì)分析了抗拔和抗壓試樁在各級(jí)豎向荷載作用下軸力和側(cè)摩阻力變化及傳遞特征，詳細(xì)分析了抗水平樁在各級(jí)水平荷載作用下內(nèi)力和彎矩變化規(guī)律；基于載荷試驗(yàn)結(jié)果，分析了單樁水平、抗拔及抗壓承載能力；此外，利用試樁水平和抗拔靜載荷試驗(yàn)結(jié)果，通過散點(diǎn)擬合，建立抗拔承載力特征值的平均值與樁徑和單樁水平極限承載力的平均值與樁徑的估算公式。研究結(jié)果表明：彎矩最大位置隨推力增大而逐漸下移，在最大水平推力下，-600，-800和-1 000mm樁彎矩最大點(diǎn)位于推力點(diǎn)以下3-6，4和5m左右；單樁抗拔承載力極限值的平均值與樁徑和水平承載力特征值的平均值與樁徑均成線性關(guān)系。
［關(guān)鍵詞］大型煉廠； 軟弱地基處理； 鉆孔灌注樁； 現(xiàn)場試驗(yàn)
中圖分類號(hào)：TU473文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2017)09-0071-09
In-situ test and analysis of bored pile treatment of large-refinery foundation
Yuan Baojun1, Ma Yongfeng2, Zhou Dingheng3, Zhou Kai4, Zhou Xunjun2
(1 School of Civil Engineering, Southeast Jiaotong University, Chengdu 611756, China; 2 Department of Geotechnical Engineering, China Petroleum East China Design Institute, Qingdao 266071, China; 3 China Railway Fifth Survey and Design Institute Group Co., Ltd., Beijing 102600, China; 4 School of Civil and Ocean Engineering, Huaihai Institute of Technology, Lianyungang 222005, China)
Abstract:Treatment of soft foundation in large-scale refinery project is very complex. In view of this condition, in-situ tests of horizontal, compressive and uplift bored piles with different pile diameters and rock-socketed conditions were carried out. The contents of in-situ tests included low strain dynamic test, core drilling method test, pile-body internal force test and static load test of single pile after construction of bored pile. Based on results of low strain dynamic test and core drilling method test, pile quality and integrity were analyzed. With large amounts of pile stress monitoring results, axial force and frictional resistance change and transferring characteristics of compressive or uplift piles under the vertical loads were analyzed in details. A detailed analysis of the internal force and bending moment variation laws were conducted on the pile under all levels of horizontal loads. Based on the load test results, the horizontal bearing capacity, uplift and compression capacities of the single pile were analyzed. In addition, through scatter fitting, the static load uplift test results and the horizontal test results of the pile were used to establish estimation formulas for the average value of uplift bearing capacity characteristic value and the pile diameter and estimation formulas for the average value of horizontal ultimate bearing capacity of single pile and pile diameter. The research results show that the position with maximum bending moment moves gradually down with thrust increase, and under the maximum horizontal thrust force, maximum bending moment position is located in the position 3-6m, 4m and 5m below thrust force position respectively for piles with diameters of 600mm, 800mm and 1 000mm. The average value of pullout capacity limit value of single pile is in linear relationship with pile diameter, and the average value of horizontal bearing capacity characteristic value is also in linear relationship with pile diameter.
Keywords:larger-scale refinery; treatment of soft foundation; bored pile; in-situ test
作者簡介：苑寶軍，博士，講師，Email:97huashui@163.com。
- 下載地址
-
