摘要
以鲁地拉水库涛源金鸡达旦河拱桥段库岸稳定问题为研究对象,基于历史库岸调查,结合两段法塌岸宽度预测经验公式与再造库岸边坡稳定性极限平衡法计算,综合评价库岸稳定性,所得主要结论如下:(1)金鸡达旦河拱桥烧香岛岸历经多期内外动力地质作用,当前及未来一段时期沿桥轴线方向库岸趋于稳定,不存在威胁桥基整体稳定的岩土工程问题。(2)金鸡达旦河拱桥烧香岛岸塌岸预测宽度28 m,当前库岸到结构最小距离20 m,库水长期作用会威胁到桥基安全。(3)金鸡达旦河拱桥既有公路岸不存在塌岸问题。(4)金鸡达旦河拱桥既有公路岸边坡上部填土存在整体稳定问题,潜在滑移影响范围36 m,当前库岸到结构最小距离22 m,长期作用会威胁到桥基安全。建议施工期管理好工程弃渣,避免大规模改变现状库岸。
The Ludila Reservoir Bank stability of Jinjidadan River Arch Bridge segment is studied in this paper. It is comprehensively evaluated by historical exploration, bank slump width predicted by two-segment method and bank slump changed slope estimated by limit equilibrium method. The following conclusions are drawn： Shaoxiangdao side of the arch bridge under multiple-stage deformation is done by inner and outside dynamic geologic processes, whose current and future stability of bridge axial slope tends to be stable. No geotechnical problems will threaten whole stability of bridge base. So bank slump does harm to the bridge and its affiliated structures. The current road side of the bridge has no bank slump problems. There are stability problems in the upper filled earth of current road bank slope. So bank slump threatens bridge base＇s safety. Simuhaneously, the spoil disposal should be managed. Large-scale change for reservoir bank is abandoned.
出处
《中国农村水利水电》
北大核心
2017年第12期170-174,179,共6页
China Rural Water and Hydropower
基金
云交科教﹝2016﹞140(A)项目
关键词
库岸
塌岸预测
塌岸宽度
再造库岸边坡
稳定性
reservoir bank
bank slump prediction
bank slump width
slope changed by bank slump
stability
