小直径钢管排桩锚固深度的确定及验算
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摘要
结合抗拔和受弯曲条件共同确定钢管桩的理论锚固深度,并建立了锚固深度的验算模式。以广巴(广元—巴中)高速公路一工点为例,确定了小直径钢管排桩的理论锚固深度为5 m。采用K法计算锚固段的内力和变形并采用理论锚固深度对钢管桩锚固段进行抗拔、抗压、水平抗力和最大弯矩验算,均能满足验算条件,确定出最终锚固深度为5 m。运用数值分析的方法验证该最终锚固深度是合理的。
The theoretical anchorage depth of steel pipe piles was determined by combining with pull-out and bending conditions,and the checking model of anchorage depth was established. Taking G uangyuan-Bazhong expressway as an example,the theoretical anchorage depth of small-diameter steel pipe piles was determined to be 5 m.K method was used to calculate the internal force and deformation of the anchorage section,the theoretical anchorage depth was used to check the pull-out,compression,horizontal resistance and maximum bending moment of the steel pipe pile anchorage section,which can satisfy the checking condition,and the final anchorage depth was determined to be 5 m. The numerical analysis method,which is used to verify the final anchorage depth,is reasonable.
The theoretical anchorage depth of steel pipe piles was determined by combining with pull-out and bending conditions,and the checking model of anchorage depth was established. Taking G uangyuan-Bazhong expressway as an example,the theoretical anchorage depth of small-diameter steel pipe piles was determined to be 5 m.K method was used to calculate the internal force and deformation of the anchorage section,the theoretical anchorage depth was used to check the pull-out,compression,horizontal resistance and maximum bending moment of the steel pipe pile anchorage section,which can satisfy the checking condition,and the final anchorage depth was determined to be 5 m. The numerical analysis method,which is used to verify the final anchorage depth,is reasonable.
引文
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[2]刘卫斌.微型钢管桩在黄土地区基坑支护中的应用及计算方法[J].铁道建筑,2016,56(9):104-107.
[3]ARMOUR T,GRONECK P,KEELEY J,et al. Micropile Design and Construction Guidelines[M]. Washington DC:Federal Highway Administration,2000.
[4]向波.小直径钢管排桩抗滑机理及计算方法研究[D].成都:西南交通大学,2013.
[5]李焕焕,倪万魁,张延磊.基于抗滑桩内力计算方法———“m”法的桩顶最大位移判据研究[J].安全与环境学报,2016,16(4):177-180.
[6]吴银亮,陈林,郭礼波.基于非线性Fmincon法的抗滑桩优化设计[J].铁道建筑,2011,51(5):81-84.
[7]铁道部第二勘测设计院.抗滑桩设计与计算[M].北京:中国铁道出版社,1983.
[8]张东明,代金鑫,汤伏蛟.微型桩锚固深度对边坡稳定性及桩身内力的影响[J].安全与环境学报,2016,16(2):154-159.
[9]周志刚.土层抗滑桩锚固深度探讨[J].路基工程,1997,15(3):31-33.
[10]中华人民共和国建设部.建筑边坡工程技术规范:GB50330—2013[S].北京:中国建筑工业出版社,2013.