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黄金科学技术 ›› 2018, Vol. 26 ›› Issue (5): 647-655.doi: 10.11872/j.issn.1005-2518.2018.05.647

• • 上一篇    下一篇

库水位骤降耦合不同类型降雨泥岩边坡渗透稳定性数值模拟研究

彭博()   

  1. 1 西南交通大学土木工程学院,四川 成都 610000
  • 收稿日期:2018-08-02 修回日期:2018-09-21 出版日期:2018-10-20 发布日期:2018-10-31
  • 作者简介:彭博(1989-),男,四川成都人,工程师,从事建筑设计及其理论研究工作。
  • 基金资助:
    国家自然科学基金项目“深部工程高应力型软岩流变扰动的分数阶导数建模”(61503201)

Numerical Simulation Study of Seepage Stability of Mudstone Slope with Dif-ferent Rainfall Types Coupled with Sudden Drop of Reservoir Water Level

Bo PENG()   

  1. 1 College of Civil Engineering,Southwest Jiaotong University,Chengdu 610000,Sichuan, China
  • Received:2018-08-02 Revised:2018-09-21 Online:2018-10-20 Published:2018-10-31

摘要:

为研究泥岩边坡在库水位骤降与不同降雨类型耦合情况下的渗流特性和稳定性规律,基于岩体非饱和理论和Hoek-Brown准则,利用极限平衡理论推导出库水位与降雨耦合情况下的边坡稳定系数表达式,并利用Geo-slope软件对泥岩边坡进行数值模拟。结果表明:(1)库水位骤降情况下,孔压先减小后保持不变,监测点距库岸越远,孔压的变化幅度越小,边坡稳定系数随时间变化呈现先减小后增大,之后保持不变的规律,库水位下降速率越大,最小稳定系数越小,且其出现的时间越早;(2)不同静库水位耦合不同类型降雨情况下,孔压先增大后减小,静库水位越高,整体孔压越大;(3)库水位骤降偶遇降雨边坡内部的孔压逐渐减小,在降雨过程中陡然上升,当平均型降雨发生在库水位骤降第24~26 d时,最小稳定系数达到最小。该研究成果为正确认识降雨耦合库水位骤降情况下的岩质边坡稳定性规律提供了参考。

关键词: 库水位骤降, 不同类型降雨, 泥岩质边坡, 渗透稳定, Geo-slope软件, 数值模拟

Abstract:

In order to study the seepage characteristics and stability law of mudstone slope under the coupling of sudden drop of reservoir water level and different rainfall types,based on the unsaturated rock mass theory and Hoek-Brown criterion,the expression of slope stability coefficient under the coupling of reservoir water level and rainfall was derived by using limit equilibrium theory,and numerical simulation of mudstone slope was carried out by using Geo-slope software.The results show that the pore pressure decreases first and then remains unchanged when the reservoir water level drops suddenly.The farther the monitoring point is from the reservoir bank,the smaller the variation amplitude of pore pressure is.The slope stability coefficient decreases first and then increases with time,and then remains unchanged.The larger the reservoir water level dropping rate is,the smaller the minimum stability coefficient is and the earlier it occurs.The pore pressure increases first and then decreases under the condition of different static reservoir water level coupling different types of rainfall.The higher the static reservoir water level is,the larger the overall pore pressure is.When the reservoir water level drops suddenly and encounters occasional rainfall,the overall trend of pore pressure in slope decreases gradually and rises abruptly in the process of rainfall.The minimum stability coefficient is the smallest when the mean rainfall occurs at the 24~26 d of the sudden drop of the reservoir water level.The research results provide a reference for correctly understanding stability law of rock slope under the condition of sudden drop of reservoir water level coupled with rainfall.

Key words: sudden drop of reservoir water level, different types of rainfall, mudstone slope, seepage stability, Geo-slope software, numerical simulation

中图分类号: 

  • TU432

图1

Hoek-Brown准则包络线及Mohr-Coulomb切线"

图2

计算模型及网格划分"

图3

不同类型降雨时程曲线 (a)平均型降雨;(b)前峰型降雨;(c)中峰型降雨;(d)后峰型降雨"

表1

计算工况"

编号 计算工况 库水位 降雨
库水位/m 下降速度/(m·d -1 降雨类型 发生时刻/d
工况3 平均型降雨发生在库水位骤降的不同时刻 175→145 0.5 a

0~2

12~14

24~26

36~38

48~50

工况1 无降雨条件下的库水位不同骤降速率 175→145 0.5
1.0
1.5
工况2 不同静库水位水平下的耦合不同类型降雨 155 0 a,b,c,d 0~10
165 0 a,b,c,d 0~10
175 0 a,b,c,d 0~10

图4

不同库水位骤降速率下不同监测点的孔压变化 (a)上部监测点;(b)中部监测点;(c)下部监测点"

图5

不同库水位下降速率下稳定系数变化"

图6

不同静库水位水平下耦合不同类型降雨情况下的不同监测点孔压变化规律 (a)库水位为155 m;(b)库水位为165 m;(c)库水位为175 m"

图7

不同监测点的孔压变化 (a)上部监测点;(b)中部监测点;(c)下部监测点"

图8

稳定系数变化规律"

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