土钉支护结构侧压力分布规律分析

在基坑土钉支护设计中,一般用坑壁侧压力来估算土钉的间距、内力和长度,因此侧压力大小及分布的合理确定对设计有显著影响。通过应用三维非线性有限元方法,并采用能够在一定程度上反映基坑开挖过程中土体变形特点的本构模型,对土钉支护结构进行受力分析。计算分析表明：土钉支护中相应坑壁侧压力分布与经典土压力分布差别较大,其合力值在主动...

ANALYSIS OF THE DISTRIBUTION OF LATERAL EARTH PRESSURE ON SOIL NAILING

In the design of soil nailing,the spacing,the force and the length of the nails are estimated according to the lateral earth pressure.So the rational value and distribution of lateral earth pressure has a significant influence on the design.A three dimensional nonlinear finite element model was employed to analyze the behaviors of soil nailing,in which the characteristics of soil under excavation was considered.The analysis results showed: the distribution of lateral earth pressure on soil nailing was different from that on rigid retaining wall,and the sum of lateral earth pressure varied from the active earth pressure and the static earth pressure;the lateral earth pressure suggested by present code was not in accordance with the results by finite element method;and the degree of agreement between the reduction coefficients method for non-vertical excavation derived by different methods and the results by finite element method was not the same for different soil.