论文部分内容阅读
近几年来把射流原理应用在轻型井点降水施工中取得了较好效果。但由于种种原因,运转降水时容易发生透点(即:水位降至滤水管顶以下,地层中的大量空气被吸进井点管内),使真空度下降,水位回升,而不能达到降水的有效深度。我们认为造成这一现象的基本原因是射流泵的降深能力和排水流量超过井点的设计深度及地下水含水量。补给水又远远供不上抽吸,所以水位很快降至滤水管顶以下形成透点。那么在哪些情况下易发生透点呢?首先,在制作井点管时长度上有一定误差,施工时又存在着高程的误差,因此每根井点的埋深也就不等。在
In recent years, the principle of jet flow has been used in light well point precipitation construction to achieve better results. However, due to various reasons, it is prone to infiltration when operating rainfall (ie, the water level drops below the top of the filter tube, and a lot of air in the formation is sucked into the well tube), so that the vacuum level drops, the water level rises, and the precipitation is not effective. depth. We believe that the basic cause of this phenomenon is the ability of the jet pump to reduce the depth and the drainage flow beyond the design depth of the well and groundwater content. The supply water is far away from pumping, so the water level quickly falls below the top of the filter tube to form a transparent point. Under certain circumstances, what are the prone to transparent spots? First of all, there are certain errors in the length of the well pipe, and there is an error in elevation during construction. Therefore, the depth of each well is not equal. in