Evaluation of Xiashu loess slope stability in Zhenjiang area using different methods
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摘要:
边坡失稳是一定区域内的地质环境条件相互作用不断演化的结果，对边坡的稳定性评价时需要考虑多种因素。本文以镇江地区下蜀土边坡的稳定性影响因素和评价方法为主要研究对象，采用粗糙集属性约简理论得到对边坡影响较大的6项影响因素；通过建立影响因素相互作用关系矩阵，得出影响因素相互作用对边坡稳定性的影响程度和重要性程度以及权重值。最后建立边坡稳定性评价指标及量化标准，并确定SII指数的计算方法及对应的边坡稳定性分级，从而形成镇江地区下蜀土边坡稳定性的综合评价方法，为该地区边坡稳定评价提供依据。
Abstract:Slope instability is the result of the continuous evolution of the interaction of geological environment conditions in a certain area, so many factors should be considered when evaluating the stability of a slope. In this paper, the influence factors and evaluation methods of Xiashu loess slope stability in Zhenjiang are taken as the main research objects. Using the attribute reduction of rough set theory, six influencing factors are obtained. The influence degree, importance degree and weight value of influencing factors interaction on slope stability are received by establishing an interaction matrix of influencing factors. Finally, the evaluation index and quantitative standard of slope stability were established, and the calculation method of SII index and the corresponding slope stability classification were determined. As a result, a comprehensive evaluation method for the stability of the Xiashu loess slope in Zhenjiang area is developed, which provide a basis for the slope stability evaluation in this area.
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Key words:
- slope stability evaluation /
- rough set theory /
- influencing factors /
- rough set theory
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表 1 土质边坡整体稳定性分级
Table 1. Overall stability classification of soil slope
级别 稳定性 判别条件 1 好 边坡变形的可能性很小 2 较好 边坡产生局部变形 3 较差 边坡局部土体失稳，可能引起整体变形 4 差 边坡产生整体变形 5 极差 边坡产生整体破坏 
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表 2 各因素不同类别量化取值
Table 2. The quantization value of each factor by category
类型 取值 1 2 3 4 坡面形态 平直 凸形 凹形 阶状 坡度 (0,10] (10,30] (30,50] (50,90] 风化作用 弱 一般 强 地下水作用 弱 一般 强 相对河流位置 凸岸 凹岸 其他 降雨情况 弱 一般 强 地质构造 弱 一般 强 人类活动 无 弱 强 类型 坡向 坡高 取值 1 (0,30] (0,25] 2 (30,90] (25,35] 3 (90,150] (35,45] 4 (150,210] (45,55] 5 (210,270] (55,+∞) 6 (270,330] 7 (330,360]
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表 3 属性约简结果
Table 3. Attribute reduction results
序号 约简后的属性集 1 {坡向，坡高，坡面形态，坡度，风化作用，地下水作用，
降雨情况，地质构造，人类活动}2 {坡向，坡高，坡度，风化作用，地下水作用，降雨情况，
地质构造，人类活动}3 {坡高，坡面形态，坡度，地下水作用，相对河流位置，
地质构造，人类活动}4 {坡高，坡度，风化作用，地下水作用，降雨情况，地质构造，人类活动} 5 {坡高，坡度，风化作用，地下水作用，降雨情况，地质构造} 6 {坡度，地下水作用，降雨情况，地质构造，人类活动} 7 {坡高，坡度，地下水作用，地质构造，人类活动}
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表 4 影响因素相互作用矩阵
Table 4. Interaction matrix of influencing factors
P C C+E C-E ki/% PA PD P1 3 0 0 0 1 4 11 −3 16.18 7.78 −2.12 2 P2 0 0 0 1 3 15 −9 22.06 10.61 −6.36 1 2 P3 0 0 2 5 10 0 14.71 7.07 0.00 3 4 2 P4 0 2 11 11 11 16.18 7.78 7.78 1 1 2 0 P5 4 8 8 8 11.76 5.66 5.66 0 2 1 0 0 P6 3 13 −7 19.12 9.19 −4.95 E 7 12 5 0 0 10 68 注：P1-坡高，P2-坡度，P3-地质构造，P4-人类活动，P5-降雨作用，P6-地下水作用。
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表 5 活动性指数说明表
Table 5. Table of activity index
影响因素 权重值 k 坡度(P2) 0.2206 地下水作用(P6) 0.1912 坡高(P1) 0.1618 人类活动(P4) 0.1618 地质构造(P3) 0.1471 降雨作用(P5) 0.1176
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表 6 评价指标量化标准
Table 6. Quantitative standard of evaluation index
评价指标 0 1 2 坡高/m <25 25～55 >55 坡度/(°) <30 30～50 >50 地质构造 弱 一般 强 降雨 弱 一般 强 人类活动 无 一般 强 地下水作用 弱 一般 强
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表 7 边坡稳定性分级表
Table 7. Slope stability classification table
级别 稳定性 判别条件 SII取值 1 好 边坡变形可能性很小 <90 2 较好 边坡产生局部变形 90～110 3 较差 边坡局部土体失稳，可能引起整体变形 110～140 4 差 边坡产生整体变形 140～170 5 极差 边坡产生整体破坏 >170
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