云南塞京水库大坝右岸斜坡岩土体结构与开挖变形、破坏机理的关系
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P641

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云南省水利水电勘测设计研究院项目,国家自然科学基金重点项目(U2034203)


Relationship between rock-soil structure and excavation deformation and failure mechanism of right bank slope of Saijing Reservoir Dam in Yunnan
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    摘要:

    塞京水库位于云南省文山州广南县莲城镇塞京村附近的那伦河上,是一座以城乡生活供水、农业灌溉为主要任务的水利工程。在水库修建中,大坝右岸斜坡发生较大变形,对大坝安全构成危害。本文在野外地质调查、勘察资料、监测资料分析评价的基础上,针对大坝右岸斜坡的岩土体结构及变形破坏机理进行了研究,得出了如下结论:(1)大坝右岸斜坡位于板内向斜南翼复向斜构造内部的那忠向斜、那忠背斜处,背向斜产状变化控制着大坝右岸斜坡的演化;(2)大坝右岸斜坡岩体内部存在大量层间剪切带,后期卸荷风化作用下局部泥化,形成后期变形破坏的滑动面,岩体结构整体表现为全~强风化基岩与泥化夹层共同构成层状碎裂结构岩体;(3)大坝右岸斜坡变形破坏是由于坝基开挖导致阻滑段消失,右岸斜坡在顺层结构单元产生切层滑动,切层部位为岩层产状缓-陡的改变部位,具有推移式斜坡动力学特征;HP1滑坡为表层残坡积物失稳形成的局部堆积型滑坡;(4)大坝右岸斜坡变形依据监测资料可以划分为三个区:①微变形区,裂缝LF1南部区域;②主变形区,位于裂缝LF1与裂缝LF2、LF3之间的区域,宏观变形特征明显;③浅层局部变形区,位于永久公路以下,表层残坡积局部变形甚至破坏,形成局部表层滑坡。

    Abstract:

    Saijing Reservoir is located on the Nalun River near Saijing Village, Liancheng Town, Guangnan County, Wenshan Prefecture, Yunnan Province. It is a water conservancy project with the main tasks of urban and rural water supply and agricultural irrigation. During the construction of the reservoir, the slope on the right bank of the dam was greatly deformed, posing a hazard to the safety of the dam. Based on the analysis and evaluation of field geological survey, survey data and monitoring data, this paper studies the rock and soil structure and deformation failure mechanism of the slope on the right bank of the dam, and draws the following conclusions: (1) The slope on the right bank of the dam is located in the intraplate syncline In the Nazhong syncline and Nazhong anticline in the south wing complex syncline, the occurrence change of the anticline controls the evolution of the slope on the right bank of the dam. (2) There are a lot of interlayer shear zones in the rock mass on the slope of the right bank of the dam. Under the action of unloading and weathering in the later stage, the local argillization will form the sliding surface of later deformation and failure. Together they form a layered fractured rock mass; (3) The slope of the right bank of the dam is deformed The failure is due to the disappearance of the anti-slip section due to the excavation of the dam foundation, and the slope on the right bank produces shear sliding in the layered structural unit. Local accumulation-type landslide formed by the instability of residual slope deposits; (4) The slope deformation of the right bank of the dam can be divided into three areas according to the monitoring data: ① the micro-deformation area, the southern part of the crack LF1; ② the main deformation area, located in the crack LF1 and the crack LF2 The area between LF3 and LF3 has obvious macroscopic deformation characteristics; ③The shallow local deformation area is located below the permanent highway, and the surface residual slope is partially deformed or even destroyed, forming local surface landslides.

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霍玉国,雷宏,王孔伟,等. 云南塞京水库大坝右岸斜坡岩土体结构与开挖变形、破坏机理的关系[J]. 科学技术与工程, 2023, 23(13): 5461-5469.
Huo Yuguo, Lei Hong, Wang Kongwei, et al. Relationship between rock-soil structure and excavation deformation and failure mechanism of right bank slope of Saijing Reservoir Dam in Yunnan[J]. Science Technology and Engineering,2023,23(13):5461-5469.

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  • 收稿日期:2022-08-18
  • 最后修改日期:2023-02-21
  • 录用日期:2022-12-02
  • 在线发布日期: 2023-05-29
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