堆积层滑坡抗滑桩桩土作用机理及其工程应用研究
发布时间：2018-07-29 08:40
【摘要】：随着抗滑桩在堆积层滑坡治理工程的中的广泛应用,其应用于滑坡治理方面的研究成果也随着增多,但是仍存在着许多的不足和急需改进的地方。因此,综合考虑多种因素对抗滑桩桩土作用的影响以完善相关计算模型具有重要的理论意义和现实意义。本文以漳龙铁路茶阳车站滑坡为主要研究对象,在查阅相关文献的基础上,采用理论分析、实验采集和数值模拟分析相结合的方法,主要做了以下内容的研究及相关成果如下:(1)通过对岩土体现场取样在实验室条件下取得岩土体的各项参数,以确保其准确性并保证后续的数值模拟计算所需参数的严谨性;(2)收集数据,结合新、老滑坡的形态特征及边界条件对滑坡稳定性进行定性及定量评价得出:LHP1总体上处于稳定状态,LHP2处于稳定~基本稳定状态,而XHP1处于欠稳定~不稳定状态,有再次发生滑动可能性;(3)通过地基校核反复计算,最终确定抗滑桩桩截面和桩间距。并根据抗滑桩的上限和下限条件为抗滑桩进行配筋计算,保证抗滑桩配筋在经济配筋率之内,最大可能的在保证安全的基础上更加经济;(4)结合实例分析在不同工况下滑坡-抗滑桩作用体系包括滑坡变形控制、抗滑桩内力变化和桩间土工效应的数值模拟三维分析得出:(1)在滑坡防治中,抗滑桩的设置可以一定程度的减小滑坡位移变形;同时随着降雨入渗,岩土体的饱和度及孔隙压力会增大使得其基质吸力降低、有效应力减小而出现卸荷回弹现象,这是坡中为什么会出现一定的膨胀的主要原因;(2)随着滑坡位移的增加,抗滑桩在X方向将承受更大的推力,同时分析得出X向应力矢量图呈梯形分布,因力是相互的由此可以推断滑坡推力也呈梯形分布(这是与手算误差的原因之一);(3)在从滑坡开始滑动直到处于稳定,土拱作用一直存在直到桩周土体达到平衡,这里可以认为土拱是由岩土体的不均匀位移造成,其本身是由应力从不平衡到最终平衡的动态过程。
[Abstract]:With the wide application of anti-slide pile in the landslide treatment project of accumulation layer, the research results of its application in landslide treatment also increase, but there are still many deficiencies and urgent need for improvement. Therefore, it is of great theoretical and practical significance to consider comprehensively the influence of various factors on the action of sliding pile and soil in order to improve the relevant calculation model. In this paper, the landslide of Chayang Station of Zhanglong Railway is taken as the main research object, based on the reference of relevant documents, the method of combining theoretical analysis, experimental collection and numerical simulation analysis is adopted. The main research and related results are as follows: (1) the parameters of rock and soil are obtained by sampling the rock and soil in the laboratory. To ensure its accuracy and to ensure the rigour of the parameters required for subsequent numerical simulation calculations; (II) data collection, combined with the new, Qualitative and quantitative evaluation of landslide stability by morphological characteristics and boundary conditions of the old landslide shows that: LHP1 is in a stable state in general and LHP2 is in a stable to basic stable state, while XHP1 is in an unsteady ~ unstable state. It is possible to slide again. (3) the cross-section and spacing of anti-slide pile are determined by repeated calculation of foundation check. According to the upper and lower limit conditions of the anti-slide pile, the reinforcement of the anti-slide pile is calculated to ensure that the reinforcement of the anti-slide pile is within the economic reinforcement ratio. It is possible to be more economical on the basis of ensuring safety. (4) combined with practical examples, the landslide-anti-slide pile action system including landslide deformation control is analyzed under different working conditions. The numerical simulation results of internal force change and soil effect between piles are as follows: (1) in landslide prevention and control, the setting of anti-slide pile can reduce the displacement and deformation of landslide to a certain extent, at the same time, with the infiltration of rainfall, The increase of saturation and pore pressure of rock and soil will reduce the suction of matrix and reduce the effective stress, which is the main reason why there is a certain expansion in the slope. (2) with the increase of the displacement of the landslide, The anti-slide pile will bear more thrust in X direction. At the same time, the X-direction stress vector diagram is found to be trapezoidal distribution. Because the forces are mutual, it can be inferred that the thrust of the landslide is also trapezoidal distribution (which is one of the reasons for the error in hand calculation) from the landslide to the stability, the soil arch exists until the soil around the pile reaches equilibrium. It can be considered that the soil arch is caused by the uneven displacement of the rock and soil, and it is a dynamic process from the stress unbalance to the final equilibrium.
【学位授予单位】：河南工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P642.22;TU473.1
[Abstract]:With the wide application of anti-slide pile in the landslide treatment project of accumulation layer, the research results of its application in landslide treatment also increase, but there are still many deficiencies and urgent need for improvement. Therefore, it is of great theoretical and practical significance to consider comprehensively the influence of various factors on the action of sliding pile and soil in order to improve the relevant calculation model. In this paper, the landslide of Chayang Station of Zhanglong Railway is taken as the main research object, based on the reference of relevant documents, the method of combining theoretical analysis, experimental collection and numerical simulation analysis is adopted. The main research and related results are as follows: (1) the parameters of rock and soil are obtained by sampling the rock and soil in the laboratory. To ensure its accuracy and to ensure the rigour of the parameters required for subsequent numerical simulation calculations; (II) data collection, combined with the new, Qualitative and quantitative evaluation of landslide stability by morphological characteristics and boundary conditions of the old landslide shows that: LHP1 is in a stable state in general and LHP2 is in a stable to basic stable state, while XHP1 is in an unsteady ~ unstable state. It is possible to slide again. (3) the cross-section and spacing of anti-slide pile are determined by repeated calculation of foundation check. According to the upper and lower limit conditions of the anti-slide pile, the reinforcement of the anti-slide pile is calculated to ensure that the reinforcement of the anti-slide pile is within the economic reinforcement ratio. It is possible to be more economical on the basis of ensuring safety. (4) combined with practical examples, the landslide-anti-slide pile action system including landslide deformation control is analyzed under different working conditions. The numerical simulation results of internal force change and soil effect between piles are as follows: (1) in landslide prevention and control, the setting of anti-slide pile can reduce the displacement and deformation of landslide to a certain extent, at the same time, with the infiltration of rainfall, The increase of saturation and pore pressure of rock and soil will reduce the suction of matrix and reduce the effective stress, which is the main reason why there is a certain expansion in the slope. (2) with the increase of the displacement of the landslide, The anti-slide pile will bear more thrust in X direction. At the same time, the X-direction stress vector diagram is found to be trapezoidal distribution. Because the forces are mutual, it can be inferred that the thrust of the landslide is also trapezoidal distribution (which is one of the reasons for the error in hand calculation) from the landslide to the stability, the soil arch exists until the soil around the pile reaches equilibrium. It can be considered that the soil arch is caused by the uneven displacement of the rock and soil, and it is a dynamic process from the stress unbalance to the final equilibrium.
【学位授予单位】：河南工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P642.22;TU473.1
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