摘要
岸坡的整体稳定是深切峡谷区高速公路建设的关键因素,文中以某特大桥主墩选址为背景,根据国标中岩体结构的划分与Jcond 89对结构面等级划分方法,结合RMR 89分类法中考虑地下水对结构面条件评分的影响,构建新的GSI量化取值表。基于Hoek-Brown强度准则,获取岩体在一定应力条件下的非线性强度参数取值。计算主墩的稳定性,并通过离散元数值分析方法进一步分析岸坡的变形与位移情况。结果表明,当主墩位于K39+030与K39+580时,两岸岸坡稳定性均满足安全控制标准,且桥基处竖向位移均为毫米级别,适宜桥基修筑。
The overall stability of the bank slope is the key factor in the construction of highways in deep canyon areas.Based on the location selection of the main pier of a certain large bridge as the background,a new GSI quantitative value table was constructed according to the classification of rock mass structure in the national standard and the classification method of structural plane by Jcond 89.And the influence of groundwater on structural surface condition scores was taken into account in combination with RMR 89 classification method.The value of nonlinear strength parameters of rock mass under a certain buried depth was obtained based on Hoek-Brown strength criterion.The stability of main piers was calculated and the UDEC numerical method was used to further analysis the deformation and displacement of the bank slope.The results show that when the main pier is located at K39+030 and K39+580,the stability of the bank slopes on both banks meets the safety control standards,and the vertical displacement at the bridge foundation is at the millimeter level,which is suitable for the construction of the bridge foundation.
作者
曹俊
姜波
彭宇肸
CAO Jun;JIANG Bo;PENG Yuxi(Guizhou Transportation Planning Survey and Design Academe Co.,Ltd.,Guiyang 550081,China)
出处
《交通科技》
2023年第5期45-48,共4页
Transportation Science & Technology
基金
交通运输行业重点科技项目(2021-ZD1-021)
贵州省公路局科技项目(2022QLK04)资助。
关键词
桥梁岸坡
主墩选址
岩体强度
稳定性
数值模拟
bridge bank slope
siting of main pier
rock mass strength
stability
numerical simulation
