万州长江二桥在滑坡群中选址与滑坡利用分析  

Site selection of Wanzhou No.2 Yangtze River Bridge in landslide group and landslide utilization

作　　者：唐万金 吴建中 谭书全 

机构地区：[1]长江岩土工程总公司(武汉)重庆公司,重庆401320

出　　处：《人民长江》2013年第6期29-32,共4页Yangtze River

摘　　要：根据重庆市万州区城市规划,万州长江二桥所建位置位于古滑坡及现代变形体发育区。前期勘察工作已查明了桥位区滑坡和变形体的分布、边界条件、形态特征、物质组成、渗流场及稳定状态等情况,并对特大滑坡设置了变形观测网。为了保证大桥安全,进一步优化设计,在对滑坡充分论证的基础上进行了微观选址。北岸枇杷坪滑坡群、康家坡变形体与巨渔沱变形体成"品"字形分布;南岸楠木垭滑坡群、凉水凼滑坡和冠子背变形体呈阶梯状分布,且滑坡规模从上至下呈量级减小趋势。经综合分析,北岸除康家坡变形体对4～7号桥墩表层土体有轻微牵引影响外,其它滑坡和变形体对大桥没有影响;南岸变形体对大桥影响较小。大桥于2006年建成竣工,三峡水库于2008年蓄水运行,滑坡仅局部产生了塌滑,且塌滑方向与桥轴线平行,对桥墩无影响,大桥运行安全。According to urban planning of Wanzhou area of Chongqing City, Wanzhou No. 2 Yangtze River Bridge is built on ancient landslide and modern deformation body. Previous exploration has already found out the distribution, boundary condition, landform characteristics, material composition, seepage field and stability state of the landslides and deformation bodies in the bridge site. The network for deformation observation is established for the super - large landslide. In order to guarantee the bridge safety and further optimize the design, the micro - site selection is conducted based on thorough research for the landslide. Pipap- ing landslide group, Kangjiapo deformation body and Juyutuo deformation body in the north bank are distributed in a close - triangle form. Nanmuya landslide group, Liangshuidang landslide and Guanzibei deformation body in the north bank are distributed in a ladder- shaped form and landslide scale decreases from the top to the bottom. Through comprehensive analysis, except that Kangjiapo deformation body has slight traction influence on No. 4 -7 bridge piers, other landslides and deformation bodies have no influence ; the deformation body of the south bank has small influence on the bridge. After the bridge was completed in 2006, and Three Gorges Reservoir began water storage and was put into operation in 2008, landslide only happened in local area and the sliding direction was parallel to the bridge axis and had no influence on the bridge piers.

关 键 词：滑坡群 桥址选择 滑坡利用 万州长江二桥 

分 类 号：P642.22[天文地球—工程地质学]