库水位骤降条件下涉水边坡抗滑桩加固效果  

Research on reinforcement effect of anti-slide pile at riverside slope under water level plummeting condition

作　　者：苏国韶[1,2] 燕柳斌[1,2] 丁雷[1] 钱坤[1] 

机构地区：[1]广西大学土木建筑工程学院,广西南宁530004 [2]广西工程防灾与结构安全教育部重点实验室,广西南宁530004

出　　处：《水利水电科技进展》2013年第4期22-26,30,共6页Advances in Science and Technology of Water Resources

基　　金：国家自然科学基金(51069001);广西理工科学实验中心重点项目(LGZX201001)

摘　　要：针对工程实践中涉水边坡抗滑桩设计技术规范欠缺、计算模型过于简化等问题,采用强度折减拉格朗日差分法模拟分析水位骤降速度、水深坡高比、抗滑桩桩位等因素对涉水边坡抗滑桩加固效果的影响。结果表明:库水位骤降速度越大,抗滑桩加固后的边坡安全系数越小;与抗滑桩加固前相比,抗滑桩加固后水深坡高比与边坡安全系数的关系发生了较大变化,应计算最大库水位骤降速度工况下不同水深坡高比对应的边坡安全系数,取其中最小的边坡安全系数作为边坡稳定性判别依据;库水位骤降条件下,抗滑桩布设的位置对边坡加固效果具有较大影响,可根据不同桩位条件下的水深坡高比与边坡安全系数的关系曲线确定合理桩位。Aiming to the problems of design specifications deficiency and calculation model oversimplification for anti-slide pile at riverside slope, the shear strength reduction method based on Lagrangian difference technique was applied to simulate the reinforcement effect of anti-slide pile under water plummeting condition. The influencing factors include the speed of water level plummeting, the ratio of water depth to slope height, and the location of the anti-slide pile. Research results show that, the larger the speed of water lever plummeting, the smaller the slope safety factor, and the relationship between the ratio of water depth to slope height and the slope safety factor changes significantly due to the anti-slide pile reinforcement. Hence, it is necessary to calculate the slope safety factors corresponding to different ratios of water depth to slope height under the condition of maximum water level plummeting speed, then select the minimum one as the criterion value for slop stability analysis. Besides, the location of anti-slide pile has a relatively high influence on the slope reinforcement effect. The appropriate location can be determined by the relationship curve of the ratio of water depth to slope height and slope safety factor according to different pile locations.

关 键 词：边坡 抗滑桩加固 库水位骤降 拉格朗日差分法 强度折减法 

分 类 号：TV223[水利工程—水工结构工程]