土木建筑与环境工程
土木建築與環境工程
토목건축여배경공정
JOURNAL OF CIVIL, ARCHITECTURAL & ENVIRONMENTAL ENGINEERING
2013年
4期
84-88
,共5页
桥梁工程%深嵌岩桩%荷载传递法%承载特性%桩侧摩阻力
橋樑工程%深嵌巖樁%荷載傳遞法%承載特性%樁側摩阻力
교량공정%심감암장%하재전체법%승재특성%장측마조력
bridge engineering%deep rock-socketed pile%load transfer method%bearing characteristics%sides shear resistance
为了弥补大直径深嵌岩桩（嵌岩比 hr/b ≥5）承载特性研究领域的不足，利用青岛海湾大桥试桩z h12的自平衡测试结果，对大直径深嵌岩桩的承载特性进行了分析。研究了深嵌岩桩嵌岩段实测的桩侧摩阻力与位移关系以及桩端阻力与位移关系，并与采用双曲线分布模式的荷载传递法进行了比较。研究结果表明：在软岩地区，大直径深嵌岩桩基桩顶处的荷载位移曲线为缓变型，近似为直线分布形态。从实测曲线的拟合结果来看，岩层处的侧摩阻力与位移关系采用双曲线拟合是可行的，参数1/b也能反映出桩侧极限摩阻力的数值；桩端岩层实测的荷载位移曲线也与双曲线形态比较相似；利用拟合曲线所得到的参数 a、b反演计算所得到桩顶荷载位移曲线也与自平衡测试方法的实测结果接近。最后，根据实测结果分析了在不同单轴抗压强度状态下，桩侧极限摩阻力经验公式中参数α的取值范围。
為瞭瀰補大直徑深嵌巖樁（嵌巖比 hr/b ≥5）承載特性研究領域的不足，利用青島海灣大橋試樁z h12的自平衡測試結果，對大直徑深嵌巖樁的承載特性進行瞭分析。研究瞭深嵌巖樁嵌巖段實測的樁側摩阻力與位移關繫以及樁耑阻力與位移關繫，併與採用雙麯線分佈模式的荷載傳遞法進行瞭比較。研究結果錶明：在軟巖地區，大直徑深嵌巖樁基樁頂處的荷載位移麯線為緩變型，近似為直線分佈形態。從實測麯線的擬閤結果來看，巖層處的側摩阻力與位移關繫採用雙麯線擬閤是可行的，參數1/b也能反映齣樁側極限摩阻力的數值；樁耑巖層實測的荷載位移麯線也與雙麯線形態比較相似；利用擬閤麯線所得到的參數 a、b反縯計算所得到樁頂荷載位移麯線也與自平衡測試方法的實測結果接近。最後，根據實測結果分析瞭在不同單軸抗壓彊度狀態下，樁側極限摩阻力經驗公式中參數α的取值範圍。
위료미보대직경심감암장（감암비 hr/b ≥5）승재특성연구영역적불족，이용청도해만대교시장z h12적자평형측시결과，대대직경심감암장적승재특성진행료분석。연구료심감암장감암단실측적장측마조력여위이관계이급장단조력여위이관계，병여채용쌍곡선분포모식적하재전체법진행료비교。연구결과표명：재연암지구，대직경심감암장기장정처적하재위이곡선위완변형，근사위직선분포형태。종실측곡선적의합결과래간，암층처적측마조력여위이관계채용쌍곡선의합시가행적，삼수1/b야능반영출장측겁한마조력적수치；장단암층실측적하재위이곡선야여쌍곡선형태비교상사；이용의합곡선소득도적삼수 a、b반연계산소득도장정하재위이곡선야여자평형측시방법적실측결과접근。최후，근거실측결과분석료재불동단축항압강도상태하，장측겁한마조력경험공식중삼수α적취치범위。
In order to study bearing characteristics of deep rock-socketed piles ( hr/b≥ 5 ) ,based on the test results of self-balancing test of zh12 pile in Qingdao Gulf Bridge ,the bearing characteristics of deep rock-socketed piles were analyzed .The relation between sides shear resistance of the piles and its displacement socked in soft rock was researched ,and the relation between end bearing resistance and displacement was studied .The hyperbolic distributions on the load transfer method were compared to them .The results indicate that Q-S curve of large diameter deep socketed pile in soft rock area declines slowly ,approximately in linear distribution .According to the fitting curve based on measured results ,it is feasible to fit the relationship between sides shear resistance and its displacement by using hyperbola .The parameter of 1/b also reflects the ultimate side resistance values of piles . T he load-displacement curve at the top of pile is similar to the hyperbolic form .By using the parameters of a 、b obtained from fitting curve ,the calculated load-displacement curve on top of pile is close to the measured curve of self-balance method .At last , according to the measured results ,the value range of parameterαin empirical formula was analyzed under different states of axial compressive strength .
