多锚点锚拉桩在广东深圳地区多层滑床滑坡防治工程中的应用

Engineering application of multi-anchor anti-slide pile in landslides with multi-layer slidingbed:A case study in Shenzhen,Guangdong Province

滑坡是一种常见的地质灾害,其中锚拉桩是滑坡防护的有效措施之一。在锚拉桩治理滑坡的研究中,多将滑床当作均质体进行计算,对于多层滑床滑坡的锚拉桩加固研究较少。鉴于此,本文在传统计算方法的基础上,考虑非均质滑床这一特点,对锚拉桩加固滑坡的计算模型进行改进,以深圳市某滑坡治理工程为例,根据滑坡特点进行了多锚点锚拉桩加固方案设计,并布设了深部测斜、锚力和钢筋计等监测工程,监测桩身位移及锚索应力,对比分析监测值与理论值,验证改进模型的适用性。结果表明:改进模型相对于传统模型与监测结果更吻合,准确性更高,改进模型所得到的桩顶位移及滑面处剪力小于传统算法,分别减少了28.61%和5.7%,最大弯矩值减小了20.9%。经过3年多进一步验证了多锚点锚拉桩加固滑坡工程的有效性,本文的改进模型可为工程降低一定的成本,并对多层滑床滑坡的加固工程设计提供了一定的借鉴和参考。

Landslide is one of the common geological disasters,and the anchor pile is one of the effective measures to prevent landslide.In the research of anchor-pull pile landslide control,the sliding bed is mostly calculated as homogeneous body,and the research on anchor-pull pile reinforcement of multi-layer sliding bed landslide is less.In view of this,based on the traditional calculation method and considering the characteristics of heterogeneous sliding bed,the calculation model of landslide strengthened by anchor-drawn pile is improved,taking a landslide control project in Shenzhen city as an example,according to the characteristics of the landslide,the design of multi-anchor anchor pile reinforcement program was carried out,and the deep slope measurement,anchor force and steel bar monitoring project were set up.monitors the displacement of the pile and anchor cable stress,compares the monitoring value with the theoretical value,and verifies the applicability of the improved model.The results show that the improved model is more consistent with the monitoring results and more accurate than the traditional model.The displacement of pile top and anchor cable stress obtained by the improved model are both lower than the traditional algorithm,which are reduced by 17.8%and 28.61%respectively,and the maximum bending moment is reduced by 20.82%.After more than 3 years of operation,the effectiveness of multi-anchor anchor pile strengthening landslide project is further verified,it can be seen that the improved model in this paper can reduce a certain cost for the project and provide a certain reference for the support design of multi-layer slide bed landslide.