大圆筒结构整体稳定性和水平变位三维数值模拟

大圆筒结构作为水运工程新型结构形式,受力机理复杂,行业内对其认识较为有限。为研究大圆筒结构整体稳定性和水平变位的影响因素,采用PLAXIS 3D软件模拟大圆筒结构在不同地基土密度、强度、刚度,不同筒内回填料密度、强度以及不同埋深工况下整体稳定性和水平变位。结果表明,大圆筒结构整体稳定性随地基土密度、摩擦角和埋深的增大而增加,随回填料密度增大而降低,与回填料摩擦角和地基土弹性模量无关;大圆筒结构水平变位随地基土密度、摩擦角、弹性模量和埋深的增大而减小,随回填料密度的增大而增大,与回填料摩擦角无关。该成果可为大圆筒结构设计提供参考依据。

3D numerical simulation of the overall stability and horizontal displacement of large cylinder structure

As a new type of structure in port and waterway engineering,large cylinder structure is limited understood in the field due to the complicated mechanism.In order to study the factors which affect the overall stability and horizontal displacement of the large cylinder structure,a 3D numerical model is established based on PLAXIS 3D software which is used to simulate the overall stability and horizontal displacement of the large cylinder structure under the conditions of the different density, strength and stiffness of foundation soil,the different density,strength of filling soil,and the different embedded depth of large cylinder structure.The results show that the overall stability of large cylinder structure increases with the increase of foundation soil density,friction angle and embedded depth, decreases with the increase of filling soil density,and is independent of the filling soil friction angle and the foundation soil elastic modulus.The horizontal displacement of large cylinder structure decreases with the increase of soil density,friction angle,elastic modulus and embedded depth,increases with the increase of filling soil density,and is independent of friction angle of filling soil.The results can provide basis for the design of large cylinder structure.