ANALYSIS OF SLOPE STABILITY BASED ON ROCK MASS QUALITY GRADE EVALUATION: A case study of Xiahekou-Lagushao road section in Kuandian area of Liaoning Province
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摘要:
在对岩体质量定性分析及相关指标定量分析的基础上, 将岩体质量分为不同级别. 根据岩体的不同质量等级, 通过岩石力学性质分析了下河口-拉古哨路段边坡的稳定性. 结果表明: 侵入岩组(石英二长岩、石英正长岩)和变质岩组(混合岩)岩体节理对边坡失稳破坏的影响较小; 变质岩组(片麻岩)岩体的风化程度和完整程度降低了边坡的稳定程度. 风化程度、完整程度、结构特征、结构面产状及延伸性是影响边坡稳定性的主要原因, 边坡破坏方式和程度可能出现多种模式.
Abstract:The rock mass quality is divided into different grades on the basis of qualitative analysis of rock mass quality and quantitative analysis of related indexes. According to the different quality grades, the slope stability along Xiahekou-Lagushao road section is analyzed by rock mechanical properties. The results show that the joints of intrusive rock group (quartz monzonite, quartz syenite) and metamorphic rock group (migmatite) have minor influence on the slope instability failure. The weathering and poor integrity of metamorphic rock mass (gneiss) reduce the slope stability. The weathering degree, integrity degree, structural characteristics, occurrence and extensibility of structural planes are the major factors affecting the slope stability, with multiple modes of slope failure and degree.
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Key words:
- rock mass grade /
- rock mechanics /
- slope stability /
- metamorphic rock group /
- Liaoning Provinc
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表 1 岩体子类的基本质量等级特征一览表
Table 1. Basic quality grade characteristics of rock mass subclasses
岩体
小类岩体子类 点号 风化程度 岩体体积节理数Jv /（条/m2） 岩体完整性指数Kv 完整情况 点荷载强度指数的平均值Is（50） 岩石单轴饱和抗压强度Rc /MPa 坚硬程度 岩体基本质量指标BQ 质量
等级侵入岩组 石英正长岩 YD040 微风化 8 0.607 较完整 4.25 67.51 坚硬岩 454.27 Ⅱ 石英二长岩 YD041 微风化 5 0.692 较完整 3.95 63.94 坚硬岩 464.82 Ⅱ YD042 微风化 7 0.635 较完整 4.86 74.68 坚硬岩 482.79 Ⅱ YD043 中等风化 5 0.692 较完整 5.58 82.89 坚硬岩 521.66 Ⅱ YD044 微风化 12 0.510 较破碎 4.64 72.20 坚硬岩 444.10 Ⅲ 变质岩组 混合岩 YD045 中等风化 5 0.692 较完整 5.01 76.44 坚硬岩 502.32 Ⅱ 片麻岩 YD046 中等风化 14 0.470 较破碎 2.36 43.40 较硬岩 347.71 Ⅳ YD015 全风化 极破碎 极软岩 Ⅴ YD016 全风化 破碎 软岩 Ⅴ YD017 中等风化 4 0.721 较完整 4.12 66.04 坚硬岩 478.36 Ⅱ YD019 微风化 4 0.721 较完整 5.04 76.75 坚硬岩 510.50 Ⅱ YD030 中等风化 14 0.470 较破碎 2.14 40.35 较硬岩 338.55 Ⅳ YD031 微风化 12 0.510 较破碎 1.97 37.93 较硬岩 331.30 Ⅳ 
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表 2 下河口-拉古哨路段边坡岩体质量分级
Table 2. Rock mass quality grading of the slope along Xiahekou-Lagushao road section
岩性 石英正长岩 石英二长岩 中等风化混合岩 中等风化片麻岩 BQ值 ＞451 ＞440 ＞451 251~350 岩体质量等级 Ⅱ Ⅱ—Ⅲ Ⅱ Ⅳ
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表 3 各类岩体力学参数值表
Table 3. Mechanical parameters of rock masses
参数 石英正长岩 石英二长岩 中等风化混合岩 中等风化片麻岩 内聚力c/MPa 0.702 0.693 0.712 0.413 内摩擦角φ/（°） 42.1 37.8 39.5 32.4
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