Huangtupo Landslide Stability and Geological Environment of the New Relocation Site in Badong City
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摘要: 为保证三峡库区巴东组易滑地层区城市规划发展地质安全，采用系统分析与类比的方法，探讨了非正常斜坡地质环境的开发利用与保护问题.巴东城区黄土坡滑坡是一个多期次形成的特大型复合变形体，系统分析表明，在三峡水库运行条件下，该滑坡前缘稳定性较差，但整体基本稳定，仍可限制性加以利用，实施部分搬迁避险是必要的.从整体而论，迁建新址区与黄土坡滑坡区地质环境条件类同，即同属三峡库区，由巴东组易滑地层组成、以顺向坡体结构为主要特色的斜坡地质环境，发育多个影响较大的滑坡，显现出地质环境比较脆弱的一面，利用时仍须加以限制.通过加强地质灾害防治体系建设和风险管制，能保证两区规划发展在允许风险水平条件下的地质安全.Abstract: To ensure the geological security for the development of urban planning of facility-sliding strata of Badong Formation in the Three Gorges reservoir area, we discuss the geological environment development and protection issues in abnormal slope areas by means of system analysis and analogy. Loess landslide in Badong City is a super complex deformable body formed by multi-stages, and systematic analysis indicates that under the condition of the operation of Three Gorges reservoir, the loess landslide is nearly in whole stability except the front which can be put to restrictive use.So part of relocation is necessary and appropriate. Generally speaking, the new site area and the loess landslide share similar geological environment, belonging to the slope geological environment of the Three Gorges reservoir area characterized by facility-sliding strata of Badong Formation and consequent slope structure. The development of a large number of influential landslides reveals a more vulnerable side of the geological environment, and as a result it can only be subject to restrictive use. Strengthening the construction of geological disaster prevention system and risk management can control the risk level of the planning and development in allowed geologically secure conditions.
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图 1 巴东城区地质环境条件
1.巴东组第四段：紫红色泥岩夹砂岩；2.巴东组第三段：灰岩、泥质灰岩、泥灰岩；3.巴东组第二段：紫红色泥岩夹粉砂岩；4.巴东组第一段：页岩、泥灰岩；5.嘉陵江组第三段：白云质灰岩、灰岩；6.地层界线；7.地层产状；8.断层及产状；9.背斜；10.向斜；11.滑坡体；12.Ⅰ、Ⅱ临江崩滑堆积体；13.三道沟滑坡；14.冲沟；15.大桥
Fig. 1. Geological environment conditions in Badong city
图 2 黄土坡滑坡组成剖面
1.巴东组第二段；2.巴东组第三段；3.泥岩夹粉砂岩；4.灰岩、泥质灰岩、泥灰岩；5.滑带或局部粘性土软层；6.下降泉及流量(L/s)；7.地下迳流
Fig. 2. Component section of Huangtupo landslide
图 3 Ⅰ号崩滑体变形过程数值分析应力分布
Fig. 3. Ⅰ# collapse stress distribution of deformation processes numerical analysis
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