供水管网漏损引起的土体流化试验研究

Experimental Study on Water-soil Interaction in Water Supply Pipeline Network Leakage

针对传统的土体流化实验难以观察到砂床内部真实反应情况的问题,通过基于透明土的三维可视化土体流化模拟实验装置,对管道漏损后射流侵蚀土体的过程以及影响因素进行了可视化实验模拟研究。结果表明土体流化孔洞存在着3种不同发展状态和相应的侵蚀坑形态,土体颗粒由初始时总体向上运动逐渐发展成两侧回流状态流动。孔隙率越小、粒径以及上部荷载越大,土体完全流化所需的流量也越大,砂床越不容易被流化。

In view of the difficulty in observing the true reaction inside the sand bed and the influence of the boundary effects in traditional soil fluidization experiments, a three-dimensional visual soil fluidization simulation experimental device based on transparent soil is used to study the process of jet erosion of soil after pipeline leakage and the influencing factors.The results show that the fluidized cavity has three different development states and shapes. The soil particles gradually develop from the initial upward movement to a state of recirculation on both sides. The smaller the porosity, the larger the particle size and the upper load, the larger the flow rate required for the complete fluidization of the soil, making the fluidization process more difficult.