摘要
为探索不同锚固参数对既有高边坡陡开挖加固效果的影响,以某一级公路四级路堑边坡为工程背景,针对道路扩建中典型路堑边坡陡开挖锚固设计方案,采用三维数值模拟方法,对开挖面施作系统锚杆+预应力锚索+一阶平台钢管桩加固下的边坡进行模拟计算,分析了锚索预应力、锚索长度、锚索(杆)下倾角、锚杆长度对边坡变形及稳定性的影响。结果表明:锚索预应力超过450 k N、锚索长度超过20 m时对提高边坡稳定性已较少;锚索(杆)下倾角与锚杆长度对控制边坡变形及稳定性影响较大,当锚索(杆)下倾角在15°~20°时对边坡稳定性最有利,但下倾角过大对控制边坡变形则不利。增大锚杆长度对控制边坡变形及稳定性有利,但长度超过10 m时对提高边坡稳定性作用不大。
In order to explore the influence of different anchorage parameters on the reinforcement effect of steep excavation of existing high slope,taking the cutting slope in a first grade highway as the engineering background,aiming at the design scheme of steep excavation anchorage of typical cutting slope in road expansion,the slope reinforced by systematic anchor+prestressed anchor cable+steel pipe pile in first-order platform is simulated and calculated by using three-dimensional numerical simulation method,and the effects of anchor cable prestress,anchor cable length,anchor cable(rod)dip angle and anchor bolt length on slope deformation and stability are analyzed.The results show that when the prestress of anchor cable exceeds 450 k N and the length of anchor cable exceeds 20 m,which has less effect on improving slope stability.The dip angle of anchor cable(bolt)and the length of anchor bolt have great impacts on the control of slope deformation and stability.When the dip angle of anchor cable(bolt)is 15°~20°,it is the most favorable for slope stability,but too large dip angle is unfavorable for the control of slope deformation.Increasing the bolt length is beneficial to control the slope deformation and stability,but it has little effect on improving the slope stability when the bolt length exceeds 10 m.
作者
曾锦秀
ZENG Jinxiu(Fujian Chuanzheng Communications College,Fuzhou,Fujian 350007,China;Collaborative Innovation Center for Application Technology of“Transportation Civil Engineering Intelligence and Green Construction”,Fujian Province,Fujian Chuanzheng Communications College,Fuzhou,Fujian 350007,China)
出处
《水利与建筑工程学报》
2022年第3期102-107,114,共7页
Journal of Water Resources and Architectural Engineering
基金
福建省中青年教师教育科研项目(JAT210702)
福建省教育厅应用技术协同创新中心项目(闽教科[2018]105号)。
关键词
预应力锚索
锚杆
微型钢管桩
路堑边坡
陡开挖
三维数值模拟
边坡稳定性
prestressed anchor cable
bolt
micro steel pipe pile
cutting slope
steep excavation
3D numerical simulation
slope stability
