库水对香丽金沙江大桥丽江岸边坡稳定性影响

发布时间：2018-04-14 22:05

本文选题：丽江岸边坡 + 位移　；参考：《中国农村水利水电》2017年06期

【摘要】：以香丽金沙江桥丽江岸边坡静动力稳定问题为研究对象,基于Phase2D软件,利用有限元强度折减,设计了无水、拟建水库运行低水位、水库正常蓄水位等3类工况,分别计算了上述每类工况0、0.10、0.15、0.20、0.25、0.30、0.35、0.40、0.45、0.50 g等10个拟静力法地震工况稳定性。经对比得到的安全系数和监测位移变化规律,所得主要结论如下:(1)香丽高速公路金沙江大桥丽江岸边坡的破坏模式为:后缘为陡倾结构面控制,剪入破坏发生在桥基和重力式锚碇位置区域;沿缓倾结构面滑移,前缘沿缓倾结构面剪出。(2)香丽高速公路金沙江大桥丽江岸边坡无水、拟建水库运行低水位和正常蓄水位工况下基于安全系数确定的临界水平地震加速度0.30 g;基于变形确定的临界值为0.20 g。(3)根据地震安全性评价,工程区地震动峰值加速度0.15~0.30 g,因此在容易发生破坏的位置要增补部分工程加固措施,以满足工程稳定性要求。(4)边坡静动力稳定性评价,需要同时考虑强度和变形控制标准,该边坡安全监控的预警值可参考无水工况下14 mm、低水位下9 mm、正常蓄水位下5 mm。
[Abstract]:Taking the static and dynamic stability of Lijiang bank slope of Xiangli Jinsha River Bridge as an object of study, based on Phase2D software, using finite element strength reduction, three kinds of working conditions, such as no water, low water level in operation of proposed reservoir and normal water level of reservoir, are designed.The stability of 10 quasi static seismic conditions, such as 0.10 ~ 0.10 ~ 0.15 ~ 0.20 ~ 0.25 ~ 0.30 ~ 0.35 ~ 0.35 ~ 0.40 ~ 0.45 ~ 0.50 g and so on, are calculated respectively.By comparing the safety factor and monitoring displacement, the main conclusions are as follows: 1) the failure mode of Lijiang bank slope of Jinsha River Bridge on Xiangli Expressway is as follows: the rear edge is controlled by steeply inclined structural plane.The shear failure occurs in the area of bridge foundation and gravity Anchorage, slippage along the gently inclined structural plane, and shear along the front edge along the gently inclined structural plane. 2) there is no water on the bank slope of Jinsha River Bridge on Xiangli Expressway.The critical horizontal seismic acceleration determined by the safety factor is 0.30 g under the condition of low water level and normal storage water level of the proposed reservoir, and the critical value determined by deformation is 0.20 g 路m3).The peak acceleration of ground motion in the engineering area is 0.15 ~ 0.30 g, so it is necessary to add some reinforcement measures to meet the requirements of engineering stability in order to evaluate the static and dynamic stability of the slope, which needs to consider both strength and deformation control criteria.The warning value of the slope safety monitoring can be referred to 14 mm in the condition of no water, 9 mm in the low water level and 5 mm in the normal water level.
【作者单位】：云南省交通规划设计研究院陆地交通气象灾害防治技术国家工程实验室;中国科学院武汉岩土力学研究所岩土力学与工程国家重点试验室;
【基金】：云南省交通科技项目[云交科2014(A)01] 国家自然科学基金项目(41202226,51608518,U01402231) 陆地交通气象灾害防治技术国家工程实验室开放基金项目(NELBP201501)
【分类号】：TV223

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