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成兰铁路松潘隧道入口红花屯古滑坡发育特征与稳定性分析

任三绍 郭长宝 吴瑞安 沈亚麒 张涛

任三绍, 郭长宝, 吴瑞安, 等, 2017. 成兰铁路松潘隧道入口红花屯古滑坡发育特征与稳定性分析. 地质力学学报, 23 (5): 754-765.
引用本文: 任三绍, 郭长宝, 吴瑞安, 等, 2017. 成兰铁路松潘隧道入口红花屯古滑坡发育特征与稳定性分析. 地质力学学报, 23 (5): 754-765.
REN Sanshao, GUO Changbao, WU Ruian, et al., 2017. DEVELOPMENT CHARACTERISTICS AND STABILITY ANALYSIS OF THE HONGHUATUN ANCIENT LANDSLIDE AT SONGPAN TUNNEL ENTRANCE OF CHENGDU-LANZHOU RAILWAY. Journal of Geomechanics, 23 (5): 754-765.
Citation: REN Sanshao, GUO Changbao, WU Ruian, et al., 2017. DEVELOPMENT CHARACTERISTICS AND STABILITY ANALYSIS OF THE HONGHUATUN ANCIENT LANDSLIDE AT SONGPAN TUNNEL ENTRANCE OF CHENGDU-LANZHOU RAILWAY. Journal of Geomechanics, 23 (5): 754-765.

成兰铁路松潘隧道入口红花屯古滑坡发育特征与稳定性分析

基金项目: 

中国地质调查局项目 DD20160271

国家自然科学基金项目 41402321

详细信息
    作者简介:

    任三绍(1991-), 男, 硕士研究生, 地质工程专业, 从事工程地质与地质灾害方面的研究。E-mail:rensanshao123@163.com

    通讯作者:

    郭长宝(1980-), 男, 博士, 地质工程专业, 副研究员, 主要从事工程地质与地质灾害方面的研究。E-mail:guochangbao@163.com

  • 中图分类号: P642.22

DEVELOPMENT CHARACTERISTICS AND STABILITY ANALYSIS OF THE HONGHUATUN ANCIENT LANDSLIDE AT SONGPAN TUNNEL ENTRANCE OF CHENGDU-LANZHOU RAILWAY

  • 摘要: 成兰铁路地处南北地震带中段,在内外动力耦合作用下,铁路沿线发育一系列大型—巨型古滑坡及存在古滑坡复活现象,给铁路工程规划建设造成极大危害。野外调查表明,规划建设中的成兰铁路松潘隧道入口位于红花屯古滑坡的坡脚部位,在强降雨和人类工程活动等作用下,该古滑坡近年来已发生局部复活并对铁路和下方居民区造成重大威胁。本文在野外调查的基础上,对红花屯古滑坡开展了原位大型直剪试验和稳定性模拟分析。研究表明:天然工况下,组成红花屯滑坡的碎石土抗剪强度较高,与其碎石含量呈显著的相关性,随着含石量的增加,碎石土的粘聚力有降低趋势,而内摩擦角有升高趋势。基于FLAC3D数值模拟结果表明,在天然状态下,红花屯古滑坡的总体稳定性较好,铁路开挖坡脚改变了坡体的局部应力状态,在强降雨作用下,雨水进一步弱化滑体力学强度,古滑坡体变形量变大;在滑坡采取抗滑桩、格构锚等治理后,滑坡变形得到了有效控制。该滑坡在干湿循环、地震和人类工程活动等作用下,有可能进一步发生失稳,影响铁路隧道安全和坡体下方居民区,应加强群测群防和稳定性监测。

     

  • 图  1  红花屯古滑坡区域构造位置图

    Figure  1.  Location map of the regional structure of the Honghuatun ancient landslide

    图  2  松潘县多年月平均降雨量柱状图

    Figure  2.  Histogram of monthly average rainfall in Songpan County

    图  3  红花屯滑坡全貌(镜向NE)

    Figure  3.  Honghuatun landslide landscape (orientation NE)

    图  4  红花屯滑坡平面图

    Figure  4.  Plan of the Honghuatun landslide

    图  5  红花屯古滑坡典型照片

    Figure  5.  Typical photos of the Honghuatun ancient landslide

    图  6  红花屯滑坡实测工程地质剖面图

    Figure  6.  Engineering and geological profile of the Honghuatun ancient landslide

    图  7  大型原位直剪仪工作原理图

    Figure  7.  Working principle diagram of large-scale in-situ direct shear test apparatus

    图  8  原位大型直剪试验制样

    Figure  8.  Sample preparation of in-situ direct shear test

    图  9  红花屯滑坡碎石土剪应力—剪位移关系曲线

    Figure  9.  Relation curves of shear stress and shear displacements of gravel soil of the Honghuatun landslide

    图  10  红花屯滑坡原位直剪试验剪切面照片

    Figure  10.  Shearing surface photos of in-situ direct shear test of the Honghuatun landslide

    图  11  红花屯滑坡碎石土抗剪强度曲线

    Figure  11.  Curves of shear strength of gravel soil of the Honghuatun landslide

    图  12  不同工况下有限差分模型网格划分

    Figure  12.  Finite difference model meshing of the Honghuatun landslide under different working conditions

    图  13  不同工况下位移云图

    Figure  13.  Displacement contour map under different working conditions

    图  14  不同工况下监测点位移时程曲线

    Figure  14.  Displacement time-history curves of the monitoring points under different working conditions

    图  15  不同工况下剪应变增量云图

    Figure  15.  Shear stress increment map under different working conditions

    表  1  碎石土物理力学参数

    Table  1.   Values of mechanical parameters of gravelly soil

    样品编号 含水率 密度(g/cm3) 内摩擦角(°) 粘聚力(kPa)
    CL16ZJ0201 17.8% 1.86 36.2 46.5
    CL16ZJ0202 15.2% 1.83 38.4 29.5
    下载: 导出CSV

    表  2  岩土体物理力学参数取值表

    Table  2.   Values of mechanical parameters of rock and soil mass

    岩性 密度(g/cm3) 体积模量(MPa) 剪切模量(MPa) 粘聚力c/(kPa) 内摩擦角ϕ/(°) 泊松比μ
    板岩 2.25 6200 3500 120 48 0.2
    碎石土(天然) 1.86 100 60 50 36 0.26
    碎石土(饱水) 1.89 80 43 38 26 0.23
    黄土(天然) 1.52 90 52 90 28 0.28
    黄土(饱水) 1.75 70 41 60 22 0.22
    下载: 导出CSV
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