静宁县田堡调蓄水池滑坡成因及稳定性分析

韩朝君; 李国营; 吴玮江; 张立军; 韩海龙

doi:10.16031/j.cnki.issn.1003-8035.202305036

静宁县田堡调蓄水池滑坡成因及稳定性分析

1.
甘肃省地质矿产勘查开发局第二地质矿产勘查院，甘肃兰州　730020

2.
甘肃省科学院地质自然灾害防治研究所，甘肃兰州　730000

基金项目: 甘肃省科学院应用研究与开发项目（2022JK-04）

详细信息

作者简介: 韩朝君（1997-），男，黑龙江大庆人，工程师，主要从事工程地质与地质灾害防治研究。E-mail：1441255419@qq.com

通讯作者: 吴玮江（1963-），男，甘肃天水人，研究员，主要从事工程地质与地质灾害防治研究。E-mail：wwj0408@163.com

中图分类号: P642.22

收稿日期: 2023-05-26

修回日期: 2023-10-18

刊出日期: 2023-12-25

Causes and stability analysis of the landslide at Tianbao Reservoir in Jingning County, Gansu Province

1.
The Second Geological and Exploration Institute of Gansu Provincial Bureau of Geology and Mibneral Exploration and Development, Lanzhou, Gansu 　730020, China

2.
Institute of Natural Geological Disasters, Gansu Academy of Sciences, Lanzhou, Gansu　730000, China

More Information

Corresponding author: WU Weijiang, wwj0408@163.com

Received Date: 26 May 2023

Revised Date: 18 October 2023

Publish Date: 25 December 2023

摘要

摘要:
2020年9月18日，甘肃省平凉市静宁县四河镇田堡村田堡调蓄水池左岸发生滑坡，滑坡长180 m，宽240 m，体积48.5×10⁴ m³，主滑方向191°，为黄土-泥岩老滑坡的复活。滑坡破坏已开挖的边坡和公路路基，严重威胁田堡调蓄水池的正常建设。通过现场勘查、岩土试验和计算等工作，对田堡调蓄水池滑坡形成的地质条件、滑坡基本特征及滑坡成因进行了探讨，并采用简化Janbu法对滑坡稳定性进行分析。研究发现，滑坡形成条件主要为老滑坡地质基础、坡体前缘开挖、持续性强降雨三个方面，即坡脚大规模开挖和强降水的共同作用下，引发老滑坡的复活滑动。稳定性计算结果表明，在坡脚开挖后坡体滑动前，暴雨条件下坡体稳定系数小于0.98，处于失稳滑动状态，滑动后各工况稳定系数小于1.05，处于不稳定—欠稳定状态。
- 滑坡 /
- 成因 /
- 工程开挖 /
- 降水 /
- 稳定性
Abstract:
On September 18, 2020, a landslide occurred on the left bank of Tianbao Reservoir in Tianbao Village, Sihe Town, Jingning County, Pingliang City, Gansu Province. The landslide is 180 m long, 240 m wide, 48.5×10⁴ m³ in volume, and 191° in main sliding direction, which is the revival of the old loess-mudstone landslide. Landslide destroys the excavated slope and highway subgrade, which seriously threatens the normal construction of Tianbao Reservoir. Through field investigation, geotechnical test and calculation, the geological conditions, basic characteristics and causes of landslide formation in Tianbao Reservoir were discussed, and the stability of landslide was analyzed by simplified Janbu method. The study found that the formation conditions of the landslide are mainly three aspects : the geological foundation of the old landslide, the excavation of the front edge of the slope, and the continuous heavy rainfall. That is, the old landslide is caused by the large-scale excavation of the slope toe and the heavy rainfall. The stability calculation results show that after excavating the slope toe, the stability coefficient is less than 0.98 under the rainstorm condition, which is in the unstable sliding state. After sliding, the stability coefficient of each working condition is less than 1.05, which is in the unstable-unstable state.
- landslide /
- genesis /
- engineering excavation /
- precipitation /
- stability

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图 1 研究区平面图

Figure 1.

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图 2 田堡调蓄水池滑坡照片

Figure 2.

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图 3 滑坡勘查平面图

Figure 3.

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图 4 滑坡地质剖面图

Figure 4.

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图 5 钻孔揭示的下部红层

Figure 5.

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图 6 滑坡后部滑面

Figure 6.

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图 7 滑坡东侧前缘鼓胀裂缝

Figure 7.

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图 8 蓄水池北侧老滑坡影像图

Figure 8.

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图 9 老滑坡前缘滑体与Ⅱ阶地关系图

Figure 9.

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图 10 蓄水池工程开挖老滑坡前缘

Figure 10.

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图 11 蓄水池工程开挖断面图

Figure 11.

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图 12 静宁县2020年与多年平均逐月降水量曲线图

Figure 12.

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表 1 岩土力学参数取值表

Table 1. Value table of geotechnical mechanical parameters

滑体		物理参数
		实验值			经验反算值			稳定性计算取值			工况
		γ/（kN·m⁻³）	c/kPa	φ/（°）	γ/（kN·m⁻³）	c/kPa	φ/（°）	γ_sr/（kN·m⁻³）	c/kPa	φ/（°）	工况
滑坡主剖面	滑体土	19.62	—	—	20.0	—	—	20.0	—	—	一般
	滑体土	20.49	—	—	21.0	—	—	21.0	—	—	降水
	滑带土	—	12.7	13.06	—	10.4	11.25	—	10.4	11.25	一般
	滑带土	—	12.7	13.06	—	10.4	11.25	—	10.4	11.25	降水

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表 2 稳定性计算结果一览表

Table 2. Summary of stability calculation results

类型	计算工况	稳定系数	稳定状态
现状滑体（主剖面）	一般	1.040	欠稳定
	降雨	1.030	欠稳定
	地震	0.998	不稳定

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