边坡防护中排架微型桩组合结构受力研究
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摘要
弹性地基梁理论应用的基本条件是土体为稳定体,且排架微型桩组合结构对不稳定坡体有改善作用。在弹性地基梁理论基础上,借鉴一般微型桩水平承载力的计算思路,以拟静力法计算施加地震荷载,在考虑桩土作用的情况下,以四种基本计算模型建立排架微型桩组合结构的计算公式,并通过实例计算探讨了排架微型桩组合结构的内力及对地震力的特殊反应。结果表明,排架微型桩组合结构中,后排桩的存在为前排桩提供了一个稳定的抵抗滑坡推力的条件,同时连系梁的存在将桩与桩间土体组合在一起,充分发挥了土体的抗剪能力,提高了结构的抗滑能力,削弱了地震力对边坡稳定的影响,提高了工程的安全性。
The basic requirement of the application of elastic foundation-beam theory is that the foundation should be stable and the row micro-pile composite structure can improve the stability of slope.According to the calculation of horizontal bearing capacity of micro-pile,pseudo-static method is adopted to calculate earthquake load on the basis of elastic foundation-beam theory.Considering the action of pile soil,the formulas of row micro-pile composite structure are established with four basic calculation models.The internal force of row micro-pile composite structure and its special response to seismic force are discussed with practical case.The results show that the presence of back row piles provides a stable environment for front row piles on resisting the landslide thrust;piles and soil combined through the tie beam,which gives fully play to the soil shear capacity and improves anti-sliding;the impact of seismic force on slope stabilization is weakened and it improves engineering safety.
The basic requirement of the application of elastic foundation-beam theory is that the foundation should be stable and the row micro-pile composite structure can improve the stability of slope.According to the calculation of horizontal bearing capacity of micro-pile,pseudo-static method is adopted to calculate earthquake load on the basis of elastic foundation-beam theory.Considering the action of pile soil,the formulas of row micro-pile composite structure are established with four basic calculation models.The internal force of row micro-pile composite structure and its special response to seismic force are discussed with practical case.The results show that the presence of back row piles provides a stable environment for front row piles on resisting the landslide thrust;piles and soil combined through the tie beam,which gives fully play to the soil shear capacity and improves anti-sliding;the impact of seismic force on slope stabilization is weakened and it improves engineering safety.
引文
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[6]牛欣欣.单桩静荷载曲线MMF模型拟合及承载力预测[J].水电能源科学,2011,29(5):56-58.
[7]亓乐,王青松.复合地基桩体向下卧层刺入量模型试验研究[J].水电能源科学,2010,28(9):104-105,138.
[8]李炜,郑永明,周永.近海风电基础桩土作用3D有限元模拟[J].水电能源科学,2010,28(8):162-164.
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