摘要
折线坡形边坡由于其填土面形态与经典土压力理论假设条件不符,无法直接使用经典土压力理论求解。依据挡土墙背后楔形体静力平衡原理,建立墙后多边形楔形体侧压力分析力学模型,得到总侧压力关于破裂角的函数表达式,通过求其极值,得到主动极限平衡状态墙后填土破裂角和主动土压力。分别求得坡顶地表局部水平边坡、坡顶地表局部倾斜边坡主动土压力计算公式,与现行规范方法对比表明,克服了现行规范折线坡形挡土墙上主动土压力计算方法不考虑墙土摩擦力的不足,所得土压力合力及倾覆力矩均小于规范方法计算结果,与图解法方法计算结果一致,且避免了图解法繁琐的作图工作。针对实际工程中经常出现的坡顶地表局部倾斜边坡,提出了将坡顶地表局部倾斜土层折减为均布荷载的折算系数,简化了土压力计算方法。
The assumptions of the Polyline slope is inconsistent with the classical soil pressure theory due to the difference in the shape of the fill surface,and cannot be directly solved by classical earth pressure theory.Based on the static balance principle of the wedge behind the retaining wall,the mechanical model of the pressure analysis of the wedge behind the wall was established,and the functional expression of the total lateral pressure on the rupture angle was obtained.By calculating its extremum,the fracture angle and active earth pressure of backfill soil in active limit equilibrium state are obtained.The calculation formula of the active earth pressure of the local horizontal slope of the top of slope surface and the local horizontal slope of the top of slope surface was obtained respectively.Compared with the current standard method,the proposed method in this paper overcomes the limitation of calculating the active earth pressure of slope retaining wall without considering the friction between the wall and soil.The earth pressure and the overturning moment are smaller than the calculation results of the standard method,which is consistent with the calculation results of the graphic method and avoids the tedious drawing work of the graphic method.Aiming at the local sloping slope of the slope top surface which occurs in actual engineering,in this paper,the conversion coefficient of reducing the local inclined soil layer on the slope top surface to the uniform distribution load is proposed,which simplifies the calculation method of earth pressure.
作者
吴曙光
宋福华
苏亚楠
赵定智
WU Shuguang;SONG Fuhua;SU Yanan;ZHAO Dingzhi(College of Civil Engineering,Chongqing University,Chongqing 400045,China;National Joint Engineering Re-search Center of Geohazards Prevention in the Reservoir Areas(Chongqing),Chongqing 400045,China;Chongq-ing Kun Yang Investment&Development CO.LTD..Chongqing 400030,China)
出处
《防灾减灾工程学报》
CSCD
北大核心
2020年第1期79-85,共7页
Journal of Disaster Prevention and Mitigation Engineering
基金
国家重点研发计划(2018YFC1505501)
国家自然科学基金重点项目(51638002)资助。
关键词
折线坡形边坡
楔形体平衡
墙后填土破裂角
主动土压力
折减系数
polyline slope
wedge balance
filling rupture angle behind the wall
active earth pressure
reduction factor
