土层锚杆抗滑桩嵌固深度的试验研究
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摘要
相比普通抗滑桩,桩顶锚杆的存在可以极大减小桩身内力和嵌固深度,但其计算方法目前还不是很完善,且带有一定的工程经验,因而开展这方面的试验研究就显得十分必要。本文首先介绍了土层锚杆抗滑桩系统桩侧地层抗力分布规律的室内模型试验成果,试验分三组,其中两组在坡体后缘加载,一组用千斤顶直接在桩后加载,桩身上各贴有一定数量的土压力盒,用以测定作用于桩身上的地层抗力。从试验中,得出了土层锚杆抗滑桩桩身地层抗力主要分布在桩前滑面以下部分及最大值出现的部位,并给出了桩前滑面以下部分抗力值的大致范围。然后根据试验结果,应用滑移线解法,分别计算了抗力分布为三角形与梯形时土层锚杆抗滑桩嵌固深度,最后与实际结果进行了比较。
This paper deals with a special anti-slid pile whose head is further reinforced and stabilized with bars abchored in soil.Due to the existence of anchor bars,the internal forces and the pile anchoring depth can be greatly reduced.However,the method of calculation is not yet perfect and need a certain amount of engineering experience.The experimental study is very necessary.This paper presents the model test results of earth force in the side of anti-slide pile of anchor bars.There are three groups of the tests.The loads are on the back side of the slope in two groups.The other one has itsload just behind the pile by jack.In order to get the force of the soil,some earthpressure boxes are put to get the earth pressure on side of the piles.The part of the maximum pressure of the earth pressure is mainly focused under the slip line before the pile and is found by the test.The earth pressure before the pile is got by the test.According with the result of the test,the anchoring depth of the triangle and echelon shapes of the anti pressure is computed and compared the result with what got from the test.
This paper deals with a special anti-slid pile whose head is further reinforced and stabilized with bars abchored in soil.Due to the existence of anchor bars,the internal forces and the pile anchoring depth can be greatly reduced.However,the method of calculation is not yet perfect and need a certain amount of engineering experience.The experimental study is very necessary.This paper presents the model test results of earth force in the side of anti-slide pile of anchor bars.There are three groups of the tests.The loads are on the back side of the slope in two groups.The other one has itsload just behind the pile by jack.In order to get the force of the soil,some earthpressure boxes are put to get the earth pressure on side of the piles.The part of the maximum pressure of the earth pressure is mainly focused under the slip line before the pile and is found by the test.The earth pressure before the pile is got by the test.According with the result of the test,the anchoring depth of the triangle and echelon shapes of the anti pressure is computed and compared the result with what got from the test.
引文
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[8]张文居.赵其华.刘晶晶.抗滑桩锚固深度的可靠性设计[J].岩土工程学报,2006,28(12):2153～2155.Zhang Wenju,Zhao Qihua,Liu Jingjing.Reliability design of an-choring depth for friction piles.Chinese Journal of Geotechnical Engineering,2006,28(12):2153～2155.
[9]门玉明.邓军涛.李金湘.锚索抗滑桩设计中几个问题的探讨[J].公路交通科技,2005,22(6):52～54.Men Yuming,Deng Juntao,Li Jinxiang.Study on the anchor anti-slide pile.Journal of Highway and Transportation Research and Development,2005,22(6):52～54.
[10]李寻昌.门玉明.王娟娟.锚杆抗滑桩体系的群桩、群锚效应研究现状分析[J].公路交通科技,2005,22(6):52～55.Li Xunchang,Men Yuming,Wang Juanjuan.Test study on the strata resistance force beside piles of anchor bar.Journal of High-way and Transportation Research and Development,2005,22(6):52～55.
[11]李寻昌.门玉明.何光宇.锚杆抗滑桩桩侧地层抗力分布模式的试验研究[J].岩土力学,2009,30(9):2655～2659.Li Xunchang,Men Yuming,He Guangyu.Analysis on research re-ality of the effects of pile pile groups and anchor groups in anchoranti-slide piles.Rock and Soil Mechanicst,2009,30(9):2655～2659.
[12]刘英朴.门玉明.蔺兴淼,等.锚杆抗滑桩内力计算的初参数法研究[J].水文地质工程地质,2005,(6):57～60.Liu Yingpu,Men Yuming,Lin Xingmiao,et al.The initial param-eter method study on the internal force calculation of anchor an-ti2slide pile.Hydrogeology and Engineering Geology,2005,(6):57～60.
[13]陈震.散体极限平衡理论基础[M].北京:地震出版社,1985.Chen Zhen.Theory basic of scatter system limit equilibrium[M].Beijing:China Earthquake Publishing House,1985.
[2]杨佑发,许绍乾.锚索抗滑桩内力计算的有限差分“K-K”法[J].岩土力,2003,24(1):61～64.Yang Youfa,Xu Shaoqian,Finite difference“k-k”method of cal-culation of anchor-stabilizing piles.Rock and Soil Mechanics,2003,24(1):61～64.
[3]刘小丽.张占民.周德培.预应力锚索抗滑桩德改进计算方法[J].岩石力学与工程学报,2004,23(15):2568～2572.Liu Xiaoli,Zhang Zhanmin,Zhou Depei,Improved method for com-puting anti-slide pile with prestressed anchoring cable.Chinese Journal of Rock Mechanics and Engineering,2004,23(15):2568～2572.
[4]桂树强.殷坤龙.罗平.预应力锚索抗滑桩治理滑坡应用研究[J].岩土力学,2003,24(增):239～243.Gui Shuqiang,Yin Kunlong,Luo Ping,A study on applications of stabilizing piles with pre-stressed anchor cables in landslides reme-diation works.Rock and Soil Mechanics,2003,24(Supp):239～243.
[5]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.The second survey and design institute of railway ministry.Design and computation of anti-slide piles.Beijing:China Railway Pub-lishing House,1983.
[6]年廷凯.栾茂田.郑德凤,等.基于极限分析下限方法的抗滑桩锚固深度检算[J].武汉理工大学学报,2007,29(8):82～86.Nian Tingkai,Luan Maotian,Zheng Defeng,et al.Anchorage depth computation of slope-stabilizing piles using lower-bound method of limit analysis.Journal of Wuhan University of Technology,2007,29(8):82～86.
[7]胡晓军.王建国.基于强度折减的刚性抗滑桩锚固深度确定[J].土木工程学报,2007,40(1):65～68.Hu Xiaojun,Wang Jianguo,Determination of the anchor age depth of rigid anti-slide piles based on strength reduction method.China Civil Engineering Journal,2007,40(1):65～68.
[8]张文居.赵其华.刘晶晶.抗滑桩锚固深度的可靠性设计[J].岩土工程学报,2006,28(12):2153～2155.Zhang Wenju,Zhao Qihua,Liu Jingjing.Reliability design of an-choring depth for friction piles.Chinese Journal of Geotechnical Engineering,2006,28(12):2153～2155.
[9]门玉明.邓军涛.李金湘.锚索抗滑桩设计中几个问题的探讨[J].公路交通科技,2005,22(6):52～54.Men Yuming,Deng Juntao,Li Jinxiang.Study on the anchor anti-slide pile.Journal of Highway and Transportation Research and Development,2005,22(6):52～54.
[10]李寻昌.门玉明.王娟娟.锚杆抗滑桩体系的群桩、群锚效应研究现状分析[J].公路交通科技,2005,22(6):52～55.Li Xunchang,Men Yuming,Wang Juanjuan.Test study on the strata resistance force beside piles of anchor bar.Journal of High-way and Transportation Research and Development,2005,22(6):52～55.
[11]李寻昌.门玉明.何光宇.锚杆抗滑桩桩侧地层抗力分布模式的试验研究[J].岩土力学,2009,30(9):2655～2659.Li Xunchang,Men Yuming,He Guangyu.Analysis on research re-ality of the effects of pile pile groups and anchor groups in anchoranti-slide piles.Rock and Soil Mechanicst,2009,30(9):2655～2659.
[12]刘英朴.门玉明.蔺兴淼,等.锚杆抗滑桩内力计算的初参数法研究[J].水文地质工程地质,2005,(6):57～60.Liu Yingpu,Men Yuming,Lin Xingmiao,et al.The initial param-eter method study on the internal force calculation of anchor an-ti2slide pile.Hydrogeology and Engineering Geology,2005,(6):57～60.
[13]陈震.散体极限平衡理论基础[M].北京:地震出版社,1985.Chen Zhen.Theory basic of scatter system limit equilibrium[M].Beijing:China Earthquake Publishing House,1985.
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