管井涌砂、堵塞及其防治

Sand gnshings, blocking in tube wells and their prevention

利用管井开发砂类含水层中地下水，长期以来，一直存在着滤水管涌沙、堵塞以至引起报废等问题．就管井涌沙、堵塞等原因进行了论述，并提出了防范措施，对延长管井使用寿命有重要意义．

For a long time, there always exist such problems as scraping caused by sand gushing and blocking of water filter tube in using driven-well to exploit groundwater from sandy aquiclude. The reason for sand gushing and blocking of driven-well is discussed and some precaution measures are recommended in this paper. It's of much importance for prolonging the lifespan of driven-well.