考虑分层填筑及地应力平衡的挡土墙数值仿真

针对重力式挡土墙墙后分层填土对墙身受力影响的问题,深入研究分析墙背土压力动态变化值及规律性,利用大型通用有限元分析软件ADINA,建立了平面应变单元及墙、土接触单元的有限元计算模型,并且综合考虑墙后回填土Mohr-Coulomb材料本构模型,初始地应力场平衡、墙后回填土分层碾压填筑,设置墙、土之间的接触受力进行有限元分析计算,最终采用库仑主动土压力理论计算、预埋土压力仪器监测与有限元仿真计算结果进行对比分析,能够准确地反映墙后回填土因分层填筑而导致土压力变化的规律及三者偏差幅度规律,为同类重力式挡土墙在土基上的设计和施工提供科学的技术支撑和经验参考。

Numerical Simulation of Retaining Wall Considering Layered Filling and Initial Ground Stress Balance

Focusing on the influence of layered soil filling behind the gravity retaining wall on the stress of the wall body,the dynamic change value and regularity of earth pressure behind the wall are studied and analyzed.The finite element calculation model of plane strain element and contact element of wall and soil is established by using the large-scale general finite element analysis software ADINA,and the Mohr-Coulomb material constitutive model of backfill behind the wall is comprehensively considered.The initial ground stress field is balanced,the backfill behind the wall is compacted and filled in layers,and the contact forces between the wall and the soil are set for finite element analysis and calculation.Finally,the Coulomb active earth pressure theory,the embedded earth pressure monitoring instrument and the finite element simulation results are used for comparative analysis,which can accurately reflect the law of the earth pressure change caused by layered filling of the backfill behind the wall and the deviation amplitude of the three.The law of degree provides scientific technical support and experience reference for the design and construction of similar gravity retaining wall on soil foundation.