分层地基中抗拔桩破裂面的确定方法与极限抗拔承载力计算方法研究  

Study of computation methods of ultimate uplift capacity and determining position of failure surface of uplift piles in layered soil

作　　者：何思明[1,2] 张晓曦[1,2,3] 王东坡[1,2] 

机构地区：[1]中国科学院山地灾害与地表过程重点实验室,成都610041 [2]中国科学院水利部成都山地灾害与环境研究所,成都610041 [3]西南交通大学土木工程学院,成都610031

出　　处：《岩土力学》2012年第5期1433-1437,1444,共6页Rock and Soil Mechanics

基　　金：国家自然科学基金重点项目资助项(No.40830742);国家自然科学基金资助项目(No.40872181);科技部科技支撑项目(No.2011BAK12B03)

摘　　要：应用水平条分法与极限平衡原理讨论了抗拔桩在分层地基中的极限承载力、破裂面、土体性质的关系。将破裂面看成是由若干段组合而成的复合破裂面,并沿各段将边坡水平条分为多块体。在假设边坡岩土体服从摩尔-库仑屈服准则条件下,根据极限平衡原理,建立抗拔桩极限承载力的多元函数,利用数学优化方法给出其最优解,从而可以方便地给出抗拔桩破裂面及对应的极限抗拔力。通过算例分析并与前人研究成果比较,其结果表明:该理论方法是合理有效的,可以用于预测抗拔桩地基承载力极其破裂面形状。The horizontal slice method is used to study the relation among the uplift capacity,the failure surface and soil parameters with Mohr-Coulomb failure criterion.According to the limit equilibrium approach,the uplift capacity is calculated by dividing soil around the pile into slices with regarding the potential failure surface as a group of several sectional planes.Then the multivariate function used to calculate uplift capacity is established and optimized by the sequential quadratic programming.Through the numerical calculation and comparison with the previous research,the results show that the method is reasonable and effective,and can be used to determine the failure surface shape and the magnitude of the uplift capacity of uplift piles.

关 键 词：极限抗拔力 破裂面 水平条分法 多块体 

分 类 号：TU470[建筑科学—结构工程]