半地下双层浅圆仓施工过程中力学性能的数值分析

Numerical Simulation of Mechanical Properties during Construction of Semi-underground Double-layer Squat Silo

摘要:

作为一种新仓型，半地下双层浅圆仓具有节约用地、节约能源、机械化程度高的优势，并可保证储粮品质。论文采用实体单元建立数值模型，根据场地地质条件与实际状态设置边界条件，构建了半地下双层浅圆仓的数值分析方法；经与地下粮仓的足尺试验结果进行对比，验证了数值模拟方法的可行性。通过对半地下双层浅圆仓施工过程中回填前后的受力性能进行分析，研究表明：仓底在回填前距锥底2/3处径向、环向应力达到峰值；首层仓壁在回填后距锥底1/3处径向、环向应力达到峰值。该研究可为半地下双层浅圆仓工程设计与施工提供理论支持。

Abstract:

As a new type of granary, the semi-underground double-layer squat silo has the advantages of saving space and energy, a high degree of mechanization, and ensuring the quality of grain storage. Herein, solid elements were used to establish numerical models, set boundary conditions according to the geological conditions and actual state of the site, and construct a numerical-analysis method for semi-underground double-layer squat silos. The feasibility of the numerical simulation method was verified by comparison with physical test results of the underground granary. Analysis of the mechanical performance before and after backfilling during the construction of the semi-underground double-layer squat silo showed that the radial and hoop stresses of the bottom of the silo reached a peak at two-thirds of the conical base before backfilling, and the maximum radial and hoop stresses of the first layer of the silo wall reached a peak at one-third of the conical base after backfilling. This study provides theoretical support for the engineering design and construction of semi-underground double-layer squat silos.