论文部分内容阅读
为了研究地下水流速对冻结壁形成的影响,根据相似准则,建立渗流作用下两孔地层冻结壁形成的模型试验系统,分析了不同流速下冻结壁形成过程中温度场和渗流场的变化规律,围绕流速与冻结壁交圈时间、厚度、上下游温度场及流量之间的相互关系进行深入探讨.结果表明:渗流作用导致上下游温度场不再对称,下游温度高于上游温度,下游冻结壁厚度大于上游厚度;流速对冻结壁交圈影响较大,流速越大,冻结壁发育越慢,交圈时间越长;在本模型试验中,交圈时间随渗流速度增大而成倍延长,当流速大于4.3 m/d时,冻结壁交圈困难.研究结果可为高流速富水砂层冻结壁设计施工提供依据.
In order to study the effect of groundwater velocity on the formation of frozen walls, a model test system for the formation of frozen walls in two-hole formation under seepage was established according to similar criteria. The variation of temperature and seepage fields during the formation of frozen walls at different flow rates was analyzed. The results show that the interaction between the flow velocity and the frozen wall time and thickness, the upstream and downstream temperature field and the flow rate are discussed in detail. The results show that the upstream and downstream temperature fields are no longer symmetrical, the downstream temperature is higher than the upstream temperature and the downstream frozen wall thickness Which is larger than the thickness of the upper reaches. The flow rate has a great influence on the circle of the frozen wall. The larger the flow rate, the slower the development of the frozen wall and the longer the circle. In this model test, the circle time increases with the increase of the seepage velocity. When the flow rate is more than 4.3 m / d, it is difficult to cross the freezing wall.The results can provide the basis for the design and construction of the frozen wall of high velocity and water-rich sand layer.