摘要
为合理计算抗滑桩桩间挡土板的内力与变形,采用弹性力学理论分析了桩间土拱效应,计算确定出土拱的平面形态呈中间凸起而两侧略微凹陷的曲线特征,在此基础上,引入Drucker-Prager强度准则以考虑中间主应力影响分析三维土拱效应,通过桩间土体的屈服函数分析确定了沿竖向变化的水平土拱矢高,进而计算出因桩间局部塌落拱的产生而作用于挡土板上的土压力,并按空间土压力分布模式与矩形简支板模型计算挡土板。实例分析结果表明,本文方法和数值模拟得到的沿深度方向土拱矢高值较为接近;本文方法与规范方法计算得到的板体最大弯矩值相近,其误差不超过3%。
In order to calculate reasonably the internal force and the deformation of retaining plates between adjacent two stabilizing piles,soil arching effect between the two piles is analyzed using elastic mechanics theory.It is determined that the shape of the soil arch in horizontal plane is convex in the middle and slightly concave on both sides.On this basis,Drucker-Prager strength criterion is introduced further to analyze the three-dimensional soil arching effect with consideration of the intermediate principal stress.The height of horizontal soil arching effect varied with depth to the pile top can be determined via the yield function of soil mass between the piles.Then,earth pressure on the retaining plates between the piles caused by the local collapse soil within the arch is calculated,and responses of the retaining plates can be computed according to spatial distribution pattern of the earth pressure and the rectangular simply-supported plate model.Calculation results of a practical example show that the height of horizontal soil arching effect varied with depth to the pile top obtained using the proposed method is in good agreement with that computed by numerical simulation method.Also,the maximum bending moment of each retaining plate calculated using the proposed method is fairly close to that obtained by Chinese railway standard method,and the relative error is not more than 3%.
作者
李婷
肖世国
LI Ting;XIAO Shiguo(Department of Geological Engineering,Southwest Jiaotong University,Chengdu,Sichuan 610031,China;Key Laboratory of High-speed RailwayEngineering,Ministry of Education,Southwest Jiaotong University,Chengdu,Sichuan610031,China)
出处
《中国地质灾害与防治学报》
CSCD
2019年第4期85-91,共7页
The Chinese Journal of Geological Hazard and Control
基金
国家自然科学基金(51578466)
关键词
抗滑桩
挡土板
土拱效应
土压力
内力
stabilizing pile
retaining plate
soil arching effect
earth pressure
internal forces
