“品”字型抗滑桩的数值模拟分析及工程应用研究

发布时间：2018-03-25 18:45

本文选题：“品”字型抗滑桩　切入点：数值模拟　出处：《兰州理工大学》2015年硕士论文

【摘要】：滑坡灾害在我国较为普遍,滑坡的发生会造成人员的重大伤亡和巨大的经济损失,采取可靠的措施对于滑坡的治理显得尤为重要。抗滑桩是治理滑坡较为有效的措施之一,各类型的抗滑桩不断涌现,锁儿头滑坡作为大型滑坡的代表,其治理方案对同类型滑坡具有较大的借鉴意义,“品”字型抗滑桩正是治理锁儿头滑坡前缘西侧的支挡措施,对此类型式抗滑桩的研究还处于严重缺乏阶段。鉴于目前有关“品”字型抗滑桩的研究和和案例较少,桩与桩,桩与土之间作用复杂,本文主要采用FLAC3D软件对“品”字型抗滑桩进行如下研究:(1)不同桩间距,桩顶连梁,不同桩径,不同锚固深度,不同桩截面形式进行稳定系数和桩身内力分析,以此得到合理的桩间距、桩径、锚固深度、连梁的影响以及如何设计连梁、如何设计抗滑桩截面,才能达到最优治理方案;(2)利用数值模拟和相关试验对“品”字型抗滑桩治理锁儿头滑坡效果进行分析。根据数值模拟分析,认为较合理的桩间距为3d~5d;抗滑桩间距较大时,连梁经济成本较小且对抗滑桩有利;桩间距一定时,桩径增大对稳定系数增幅不明显,对抗滑桩整体刚度贡献较大,Sn/d在4~7范围时为较合理桩径,Sn为桩间净距;根据不同的加固目的,可采取前、后排桩长度不同的组合锚固方式;不同桩截面形式抗滑桩效果不同,为达到最佳抗滑目的,在施工允许的情况下三根桩的桩截面也可采取适当组合;(3)通过数值模拟和工程监测相关数据证明“品”字型抗滑桩治理锁儿头滑坡效果较佳。本文研究结果对今后采取“品”字型抗滑桩治理巨型滑坡有一定的借鉴作用,可最大限度地节约资源,控制经济成本,达到较好的加固效果。
[Abstract]:Landslide disaster is common in our country, and the occurrence of landslide will cause heavy casualties and huge economic losses. It is very important to take reliable measures to control landslide. Anti-slide pile is one of the more effective measures to control landslide. Various types of anti-slide piles are emerging constantly. As the representative of large landslide, the treatment scheme of Laoertou landslide is of great significance for reference to the same type of landslide. The "Pin" type anti-slide pile is the supporting measure to control the west side of the front edge of the locked-head landslide. The study of this type of anti-slide pile is still in the serious lack of stage. In view of the fact that there are few researches and cases on "Pin-type" anti-slide pile, the interaction between pile and pile, pile and soil is complex. In this paper, FLAC3D software is used to analyze the stability coefficient and the internal force of the pile with different pile spacing, pile top connecting beam, different pile diameter, different anchoring depth and different cross-section of the pile. In this way, the reasonable pile spacing, pile diameter, Anchorage depth, the influence of connecting beam, how to design connecting beam and how to design the section of anti-slide pile are obtained. Only in order to reach the optimal treatment scheme, can we use numerical simulation and related tests to analyze the effect of "Pin" type anti-slide pile on the treatment of locked-head landslide. According to the numerical simulation analysis, it is considered that the more reasonable pile spacing is 3 days or 5 days, and when the spacing of anti-slide pile is large, When the pile spacing is fixed, the increase of pile diameter is not obvious to the increase of stability coefficient, and the contribution of overall stiffness of anti-slide pile is larger than that of Sn- / d in the range of 4 / 7, and the reasonable diameter Sn is the net distance between piles. According to the different reinforcement purposes, the combination anchoring method with different length of front and rear piles can be adopted, and the effect of anti-slide pile in different pile cross-section forms is different, in order to achieve the best anti-slide purpose, In the case of construction permitting, the section of the three piles can also be properly combined. Through numerical simulation and engineering monitoring data, it is proved that the "Pin" type anti-slide pile has better effect on the treatment of locked-head landslide. After the adoption of "Pin" type anti-slide pile treatment of giant landslide has a certain reference. It can save resources to the maximum, control economic cost and achieve better reinforcement effect.
【学位授予单位】：兰州理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU473.1

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