袋装砂土加固地基并维护地下管道模型试验研究

袋装砂土地基加固技术的应用十分广泛。为了研究袋装砂土对地基的加固作用及对地下管道的保护效果,进行了袋装砂土加固地基并维护地下管道的室内模型试验。试验对比了有加固和无加固地基、不同砂袋数量以及不同摆放形式下的结果,总结各组试验荷载与沉降以及荷载与应变的变化规律。试验结果表明:(1)拱形截面摆放形式结合地下管道共同作用能大幅提高地基承载力;(2)有效减少地基沉降和不均匀沉降的发生;(3)显著减小地下管道的变形。因此,袋装砂土地基加固法可应用于工程实践,能够提高地基的承载力,并有效维护地下管道设施。

Model Test Study on Packed Sand Foundation Reinforcement and Maintenance of Underground Pipeline

The application of the packed sand foundation reinforcement technology is very wide. In order to study the effect of packed sand on foundation reinforcement and underground pipeline protection, a series of laboratory tests on the packed sand foundation reinforcement and the maintenance of underground pipeline were conducted. The tests focused on the comparative analysis of the reinforced and unreinforced foundations, the different numbers of packed sand and the different storage forms, which summed up the changing rule of the load and settlement as well as the load and strain in each group. It is indicated from the experimental results that: (1) under the combination of arch storage form and underground pipeline, the bearing capacity of the foundation is greatly enhanced; (2) the foundation settlement and uneven settlement is decreased obviously; (3) the deformation of underground pipeline is reduced significantly. Therefore, the packed sand foundation reinforcement technology can be applied to engineering practice, which can effectively improve the bearing capacity of foundation and maintain the underground pipeline facilities.