铜矿岭不稳定斜坡类型识别与工程地质分区

贾伟; 罗昌宏; 董钊; 汪鸣飞; 刘小红; 包刘磊

doi:10.19509/j.cnki.dzkq.2022.0057

铜矿岭不稳定斜坡类型识别与工程地质分区

doi: 10.19509/j.cnki.dzkq.2022.0057

贾伟^1,,
罗昌宏¹,
董钊¹,
汪鸣飞^2, ,,
刘小红³,
包刘磊⁴

基金项目:

湖北省宜昌至巴东高速公路建设指挥部项目"宜巴高速公路"

详细信息

作者简介:
贾伟(1982—)，男，高级工程师，主要从事高速公路工程地质灾害防治工作。E-mail: 10633836@qq.com

通讯作者:
汪鸣飞(1996—)，男，助理工程师，主要从事高速公路工程地质勘察工作。E-mail: wangmingfei@cug.edu.cn

中图分类号: P642.22
计量
- 文章访问数: 583
- PDF下载量: 45
- 被引次数: 0
出版历程
- 收稿日期: 2021-06-18

Type identification and engineering geology zoning of the unstable slope in Tongkuangling

摘要

摘要: 高速公(铁)路路基、隧道和桥梁工程等常常因地质灾害的存在而影响正常使用, 尤其是类型不明的不稳定斜坡, 明确地质灾害类型是影响不稳定体治理方案的首要任务。以宜巴高速公路铜矿岭不稳定斜坡为研究对象, 采用野外地质调查、工程地质分析和监测数据分析的方法, 判明了铜矿岭不稳定斜坡类型。野外调查结果表明该不稳定斜坡上部为残坡积物, 下部为反倾结构的粉砂岩; 结合位移监测数据, 判定该不稳定斜坡变形存在多个剪切滑移带, 但主要分布于松散堆积物内部, 综合判定该不稳定斜坡为深层蠕动变形体; 依据变形大小和变形方向变化特点, 最后将该变形体分为两个大区, Ⅱ区又可细分为2个小区, 并指出Ⅱ₂区是未来防治的关键部位。研究成果为该不稳定斜坡后续治理设计提供了地质依据, 证明传统的工程地质调查、分析与位移监测相结合是开展不稳定体类型判识, 确定边界范围的有效手段。
- 不稳定斜坡 /
- 位移监测 /
- 深层变形体 /
- 地质灾害类型识别 /
- 工程地质分区
Abstract: The subgrade, tunnel and bridge engineering of highways or railways may be affected by some geological disasters, especially by unknown disaster types, which directly affects the overall treatment decision.This article takes the Tongkuangling unstable slope on the Yiba Expressway as an example andidentifies the types of the Tongkuangling unstable slope by using field geological surveys, engineering geological analysis and monitoring data analysis. The field investigation shows that this unstable slope is made up of the eluvial deluvial deposit of the upper part and siltstone with an inverted layer of the lower part. Combined with the displacement monitoring data, it is determined that there are multiple shear slip surfaces in the loose deposits. The unstable slope is comprehensively determined to be a deep creep deformation body. Last, according to the characteristics of deformation, the Tongkuangling deformation body is finally divided into two zones, of which zone Ⅱ can be subdivided into two small zones. The Ⅱ₂ zone is the key control part. This provides the geological basis for the subsequent treatment design of the deep deformation body.It can be seen that the combination of traditional engineering geological surveys and monitoring data analysis is an effective means to identify the type of geological disasters and determine the boundary range.
- unstable slope /
- displacement monitoring /
- deep deformation body /
- geohazard type identification /
- engineering geological zoning

HTML全文

图 1 铜矿岭不稳定斜坡

Figure 1. Unstable slope in Tongkuangling Tunnel

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图 2 监测期间日降雨量

Figure 2. Daily rainfall during the monitoring period

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图 3 巴东县构造纲要图(★为研究区位置)

J.侏罗系；T₂b⁴.巴东组第四段；T₂b³.巴东组第三段；T₂b².巴东组第二段；T₂b¹.巴东组第一段；T₁j.嘉陵江组。1.地质界线；2.滑坡；3.断层；4.平移断层；5.褶皱(左为背斜，右为向斜); 6.产状

Figure 3. Structural outline map of Badong County

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图 4 工程地质平面图

Figure 4. Geological plane of engineering

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图 5 斜坡体上公路建构筑物变形迹象(2019.8.15拍摄)

a.隧道侧壁混凝土结构开裂；b.桥面左线护栏侧向位错

Figure 5. Deformation sign of the highway structures on the unstable slope

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图 6 GNSS地表水平位移累积值监测时程曲线

Figure 6. Horizontal displacement curves with time of GNSS monitoring

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图 7 GNSS地表监测位移矢量图

Figure 7. Displacement vector diagram based on GNSS monitoring

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图 8 测斜孔总位移随深度变化曲线

Figure 8. Variation curves of total displacement with depth of inclinometer holes

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图 9 不稳定斜坡工程地质分区

Figure 9. Engineering geology of division of the unstable slope in Tongkuangling

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表 1 地表位移监测点水平位移值汇总

Table 1. Summary table of the horizontal displacement data of the monitoring points

监测点编号	正东位移量/mm	正北位移量/mm	水平位移量/mm	水平位移方向/(°)
GNSS1	-2.1	8.4	8.7	346.0
GNSS2	-55.5	41.2	69.1	306.6
GNSS3	-76.2	-36.5	84.5	244.4
GNSS4	-101.2	46.5	111.4	294.7
GNSS5	-145.9	44.7	152.6	287.0
GNSS6	-95.7	0.3	95.7	238.7
GNSS7	-70.4	-3.8	70.5	222.4
GNSS8	-84.2	63.2	105.3	306.9
GNSS9	-10.8	5.6	12.2	297.4
SK01	43.5	-75.3	86.9	297.0
SK02	18.8	83.3	85.4	307.4
SK03	-91.7	-63.5	111.5	235.3
SK04	-26.1	-5.6	26.7	257.9
SK05	-47.3	-8.3	48.0	260.0

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