三峡库区近水平厚层斜坡滑动稳定性研究——以重庆巫山箭穿洞危岩为例

王文沛; 李滨; 黄波林; 张楠; 韩笑

三峡库区近水平厚层斜坡滑动稳定性研究——以重庆巫山箭穿洞危岩为例

王文沛^1,,
李滨^2, ,,
黄波林³,
张楠¹,
韩笑¹

1.
中国地质环境监测院, 北京 100083
2.
中国地质科学院地质力学研究所, 北京 100081
3.
中国地质调查局武汉中心, 武汉 430223

基金项目:

国家自然科学基金“库水变动下堆积层滑坡渗透失稳机理研究” 41502305

详细信息

作者简介:
王文沛(1985-), 男, 高工, 主要从事地质灾害与防治研究, E-mail:wangwenpei1985@163.com

通讯作者:
李滨(1981-), 男, 副研究员, 主要从事工程地质与地质灾害研究, E-mail:libin1102@163.com

中图分类号: P642.22
计量
- 文章访问数: 208
- HTML全文浏览量: 83
- PDF下载量: 6
- 被引次数: 0
出版历程
- 收稿日期: 2016-06-25
- 刊出日期: 2016-09-01

STABILITY ANALYSIS OF SUB-HORIZONTAL THICK-BEDDED SLOPE IN THREE GORGES RESERVIOR AREA: A CASE STUDY OF JIANCHUANDONG DANGEROUS ROCKMASS IN WUSHAN, CHONGQING

1.
China Institute of Geo-Environment Monitoring, Beijing 100083, China
2.
Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China
3.
Wuhan Centre of China Geological Survey, Wuhan 430223, China

摘要

摘要: 以重庆巫山箭穿洞近水平巨厚层危岩体为例，通过地质环境条件、基座位移及应力监测数据等分析，总结归纳了危岩体目前的变形和受力状态，发现危岩体的强度仍在持续降低。同时，运用FLAC^2D模拟手段，设置了初始天然、初始饱和、临滑、失稳4种模拟工况，研究了危岩基座岩体及泥质条带灰岩层面对危岩体阻滑规律。研究结果表明，基座泥质条带灰岩层强度的持续降低将会使得危岩体处于临滑乃至失稳状态。该稳定性分析也为进一步的防治设计提供了依据。
- 三峡库区 /
- 近水平厚层斜坡 /
- 箭穿洞危岩体 /
- 安全系数
Abstract: Taking Jianchuandong dangerous rockmass in Wushan for an example, based on analyzsis of geological conditions, displacement of base and stress monitoring data, we summarized the present deformation and stress state of the dangerous rockmass, then found that the strength of it remaining reduce. Meanwhile, using FLAC^2D we set up four simulation conditions, including Initial natural, Initial saturation, critical sliding and destabilizing to research the rule of rock base and shale strip limestone when facing up rock slide. The results show that decreasing of base strength of argillaceous limestone will make dangerous rockmass in a state of critical sliding. Stability analysis of the above also provides a basis for further control of the design.
- Three Gorges Reservoir /
- sub-horizontal thick-bedding slope /
- Jianchuandong dangerous rockmass /
- factor of safety

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图 1 箭穿洞危岩平面卫星图(引自Google Earth)

Figure 1. RS images showing border of Jianchuandong rockmass

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图 2 箭穿洞危岩立面图

Figure 2. Vertical view of the Jianchuandong rockmass at the water level of 145 m and 160 m

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图 3 箭穿洞危岩A-A₁工程地质剖面图(剖面位置见图 1)

Figure 3. A-A₁ engineering geological section of the Jianchuandong rockmass

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图 4 箭穿洞危岩位移监测曲线

Figure 4. Displacement monitoring curves of the Jianchuandong rockmass

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图 5 箭穿洞危岩基座1#平垌压应力监测曲线

Figure 5. Pressure stress curves of 1# adit in the Jianchuandong rockmass

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图 6 箭穿洞危岩阻滑模拟剪切应变增量结果

Figure 6. Stimulation results of Jianchuandong rock slide shear strain increment

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表 1 箭穿洞危岩数值计算参数建议表

Table 1. Mechanical parameters of Jianchuandong rockmass

模型	重度/ (kN·m ^-3)	弹性模量/ MPa	泊松比	抗剪强度		抗拉强度/ kPa	渗透系数/ (m·d ^-1)
模型	重度/ (kN·m ^-3)	弹性模量/ MPa	泊松比	粘聚力/kPa	内摩擦角/(°)	抗拉强度/ kPa	渗透系数/ (m·d ^-1)
基座	26.5	2.06×10 ³	0.28	522	32	224	0.10
危岩体	27.1	7.16×10 ³	0.22	/	/	/	0(不透水)

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表 2 箭穿洞危岩基座及层面阻滑稳定系数

Table 2. Factors of stability resisted by base rock and bedding plane

工况		抗剪强度		稳定系数	备注
工况		内摩擦角/(°)	粘聚力/kPa	稳定系数	备注
初始天然状态	基座岩体	32	522	1.37	峰值天然强度(145m水位)
初始天然状态	基座层面	22	60	1.37	峰值天然强度(145m水位)
初始饱和状态	基座岩体	32	522	1.20	峰值饱和强度(175m水位)
初始饱和状态	基座层面	18	50	1.20	峰值饱和强度(175m水位)
临滑状态	基座岩体	32	522	1.05	层面2/3强度
临滑状态	基座层面	14	40	1.05	层面2/3强度
失稳状态	基座岩体	21	350	0.85	2/3强度
失稳状态	基座层面	14	40	0.85	2/3强度

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参考文献(10)

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