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为了研究模袋砂围堰变形特性,进行了模袋砂室内单轴压缩试验和水平加载试验,得到了模袋砂竖向、横向应力—应变关系曲线,分析了模袋砂竖向、横向力学性状。采用有限元法,结合工程实例,建立了模袋砂围堰计算模型,分析了坑内降水过程中模袋砂围堰的变形规律。结果表明,当模袋内形成稳定水位时,围堰变形趋于稳定,随着下游水位的降低,模袋砂围堰变形逐渐增大。此后,当上游水位增高时,围堰变形继续增大。将计算结果与实测值对比分析,对比结果表明文中建模方法的有效性和合理性。
In order to study the deformation characteristics of bag-shaped sand cofferdam, uniaxial compression test and horizontal loading test of mold bag sand were carried out. The vertical and transverse stress-strain curves of bag sand were obtained. The vertical and transverse mechanics of bagging sand Traits. By using the finite element method and the engineering example, the calculation model of the bagged sand cofferdam is established, and the deformation rules of the bagged cofferdam during the pit precipitation are analyzed. The results show that the deformation of the cofferdam tends to be stable when a stable water level is formed in the mold bag, and the deformation of the cofferdam sand cofferdam increases with the decrease of the water level downstream. Since then, when the upstream water level increases, the cofferdam deformation continues to increase. Comparing the calculated result with the measured value, the comparison result shows the validity and rationality of the modeling method.