多工况下汉源二蛮山滑坡机理数值模拟

陶骞; 刘超; 朱志铭; 杨勇; 邹祖银

多工况下汉源二蛮山滑坡机理数值模拟

陶骞^1,,
刘超¹,
朱志铭¹,
杨勇¹,
邹祖银^{1, 2, ,}

1.
四川农业大学城乡建设学院, 四川都江堰 611830
2.
西南交通大学土木工程学院, 四川成都 610031

详细信息

作者简介:
陶骞(1990-), 男, 四川农业大学城乡建设学院本科生, 土木工程专业。E-mail:arousecool@163.com

通讯作者:
邹祖银(1974-), 男, 副教授, 主要从事道路与铁道工程的科研和教学工作。E-mail:zouzyin@gmail.com

中图分类号: P694
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- 文章访问数: 221
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- 被引次数: 0
出版历程
- 收稿日期: 2012-06-25
- 刊出日期: 2012-12-01

NUMERICAL SIMULATION OF LANDSLIDE MECHANISM AT ERMANSHAN IN HANYUAN UNDER DIFFERENT CONDITIONS

TAO Qian^1
,,
LIU Chao¹,
ZHU Zhi-ming¹,
YANG Yong¹,
ZOU Zuyin^{1, 2
, ,}

1.
Urban and Rural Construction College, Sichuan Agricultural University, Dujiangyan 611830, China
2.
College of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China

摘要

摘要: 利用FLAC^3D软件对四川省雅安市汉源县二蛮山滑坡坡体进行建模，模拟降雨滑坡过程，并进行应力应变特征及稳定性计算分析，从而为深入研究地震及降雨诱发再次滑坡及防灾减灾提供可靠依据。研究中假设地震工况，对边坡进行详细的动力分析，得到了各监测点动力特征曲线；通过降雨工况下坡体稳定性系数分析得到了不同强度折减安全系数。研究结果表明，滑源区相对特殊的地形条件和地质构造以及不利的结构面组合是滑坡的基础；前期强降雨期间饱水加载以及大量雨水沿斜沟张裂结构面的下渗软化作用，是诱发滑坡发生的关键因素。
- 滑坡 /
- 地震工况 /
- 降雨工况 /
- 边坡稳定性 /
- 数值模拟
Abstract: In this paper, the FLAC^3D software was used to establish the model of Ermanshan Mountain in Hanyuan County, Ya'an City, Sichuan Province and to simulate the rainfall landslide process. The stress-strain features and slope stability were calculated and analysed in order to offer a reliable basis for the prediction of second landslide induced by earthquake and disaster prevention and reduction. Under the assumption of earthquake condition, the experiment detail analysed the dynamic characteristics of the side slope and obtained the dynamic characteristic curve of the monitoring points. Under the assumption of rainfall condition, the safety coefficient table with different strength reductions was acquired based on the stability analysis of the slope. Researches showed that the relatively special terrain conditions, geological structure and unfavourable structural surface combination were the basis of the landslide. Saturated water loading and the infiltration softening effect of a large amount of water along the oblique groove tension crack structural plane during the earlier heavy rainfall were the key factors causing landslide.
- landslide /
- earthquake /
- rainfall /
- stability of side slope /
- numerical simulation

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图 1 二蛮山滑坡在沟谷右侧斜坡留下的三角壁面

Figure 1. Triangle slopes wall caused by Ermanshan landslide at the right side of the valley slope

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图 2 二蛮山地形地貌及水文条件

Figure 2. Topography and hydrological conditions of Ermanshan Mountain

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图 3 1-1剖面位置图

Ⅰ—滑源启动区；1-1—沿滑体对称轴所取研究剖面

Figure 3. The location of 1-1 profile

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图 4 模型各岩层关系图

Figure 4. Relationship of different parts of rock model

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图 5 地震动力加速度时程图

Figure 5. Earthquake acceleration velocity-time graph

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图 6 各工况下边坡整体及1-1剖面位移云图

Figure 6. Displacement of the whole slope and 1-1 profile under the various conditions

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图 7 各工况下边坡整体及1-1剖面剪切应变增量云图

Figure 7. Shear strain increment of the whole slope and 1-1 profile under the various conditions

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图 8 监测点布置示意图

Figure 8. Layout of monitoring points

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图 9 各监测点动力特征曲线

Figure 9. Dynamic characteristics of the monitoring points

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表 1 岩层物理力学参数

Table 1. Physical and mechanical parameters of rocks

表 2 不同强度折减安全系数

Table 2. Safety coefficients under the different strength reductions

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