【作者】 张军；

【导师】 李远富； 杨浩；

【作者基本信息】 西南交通大学 ， 交通运输工程， 2013， 硕士

【摘要】 较大规模的滑坡往往需要采用多种加固措施进行治理,而这种多措施的联合加固方法的有效性却难以采用理论计算的方法进行分析验证。实践中,多采用现场长期监测的方法进行滑坡治理效果的评价,如地表位移监测及滑坡体深部测斜等。这种评价方法虽然可靠性较高,但成本较大,周期较长,而且只能在加固工程完工后进行,指导设计的意义不大。而可靠性日益提高的数值分析技术则可以在加固施工前,对其加固滑坡的有效性进行评价,该方法成本较低、速度快且可以良好地指导加固工程设计。本文以G5京昆高速公路K1920+390-K1920+580段左滑坡为依托工程,采用数值模拟的方法进行多措施联合加固该滑坡的有效性评价。(1)本文查明了依托滑坡的工程地质条件,提出了滑体及滑带土体的物理力学参数,分析了滑坡的特点及其成因,属大型牵引式滑坡,5.12地震及雨水下渗弱化滑面是其主要诱发因素。(2)提出了多措施联合治理滑坡方案,包括旋挖锚索桩、施挖钢管桩、预应力锚索及抗滑挡墙、坡面植被防护等。(3)采用传递系数法对滑坡稳定性进行了计算分析,经计算,滑坡体在暴雨工况及天然工况下的稳定系数分别为0.95和1.02,达不到现行规范对稳定性的要求,对该处桥梁的安全有重大影响,需要治理。并计算得出了不同位置处的剩余下滑力。(4)采用PLAXIS数值模拟软件对加固前后的滑坡进行了数值建模,通过对比分析加固前后滑体的位移及应力特征,评估了滑坡治理效果。模拟结果表明,所提出的多措施联合治理方案是可行的,滑坡得到了有效的治理。加固后的滑体仅有局部的变形位移,且多为竖向压缩变形,表明加固后的滑体是稳定的。滑坡目前的实际稳定性良好,说明了PLAXIS模拟结果的可靠性,文中提出了滑坡及各加固工程的建模方法,研究成果可直接应用于指导依托滑坡的后续稳定性评价,也将对相似工程的设计及加固效果评价提供参考。更多还原

【Abstract】 A large-scale landslide often requires a variety of reinforcement measures, but the effectiveness of this multiple unite reinforcement measures is difficult to use the theoretical calculations method to analyze and verification.we using the method of long-term surveying of the site to carry out the evaluation of the effect of landslide reinforcement in practice,such as the surveying of surface displacement and landslide inclination survey at depths. This evaluation method is highly reliable, but the cost is large, usally have a long cycle, besides, the used of this method only after the completion of the reinforcement works, so it has little significance to guide the design. While before reinforcement construction, with the reliability of the numerical analysis techniques increasing, we use it to evaluate the effectiveness of reinforcement landslide, this method has a lower cost and a fast running speed, which has a good guide to the reinforcement engineering.This paper based on the left side of landslide at K1920+390～K1920+580along G5Beijing to kunming highway, using the numerical simulation method to evaluate this multiple unite reinforcement measures.(1) This paper surveyed the engineering geological conditions of the landslide, including the physical and mechanical parameters of the soils. And then the charactieristics and the causes of the slide are analyzed, resulting in a conclusion that the slide is a large-scale tractive slide with its main predisposing factors of the5.12Wenchuan earthquake and the torrential rain.(2) Transfer coefficient method is used to calculate and analyse the landslide stability, the slide body stability parameters were0.95and1.02in torrential rain and natural conditions, fail to meet the stability requirements of National Design Specification,the slide body has a significant impact in bridge safety, surely the treatment is required,and calculate the remaining sliding force at different positions.(3) This paper offered a Multi-measures unite reinforcement proposals for slide, including the rotary digging anchor pile the rotary digging pipe piles, prestressed anchor cable and the retaining wall, slope vegetation protection.(4) The numerical simulation software PL AXIS is used to modeling the before and after reinforcement slide, by analysis and comparing the before and after reinforcement landslide displacement and stress characteristics, estimate the slide treatment effective. The simulation results show that the Multi-measures unite reinforcement proposals is feasible, slide has effective treatment. The reinforced slide only has deformation displacement and vertical compression deformation, indicate that reinforced landslide is stable.The slide is stable, which indicates that PLAXIS simulation results is reliable. Modeling method of the landslide and the reinforcement works is proposed. The research results can be directly applied to the follow-up guide relying landslide stability evaluation. Also, it can be considered a reference for a similar project.更多还原