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地基土所处状态直接同土方开挖质量,以及能否保持施工运输畅通有关。地基处于不良状态,开挖基坑时遇到含水层,就会造成边坡失稳,坑面长期积水,翻浆冒泥等现象。可见,重视并处理好地基降水是保证基坑正常施工的重要环节。井点系统降低地下水位法,施工简便,操作技术较易掌握,降水后地基保持干燥,便于施工,现已成为含水土层施工中行之有效的一种方法。但地下水的变化是复杂的,采用井点降水时,对地下水的规律要有充分认识,应综合考虑含水层的类型、厚度、补给条件、渗透性能,以及工程要求等多方面的因素;还要采取适当的井点设备和运行管理技术,作出周密的部署和合理安排,才能取得预期的理想效果。井点降水的设计,目前理论计算与实际应用还有一定差距,需要通过实践不断予以充实和完善。因此采用井点降水时,必须因时、因地、因工程制宜,选择合理的方案,以保证深层井点降水的质量。
The status of the foundation soil is directly related to the excavation quality of the earth and whether it can maintain the smooth construction transportation. The foundation is in an unfavorable condition. When the excavation foundation pit encounters an aquifer, it will cause the slope to lose stability, the pit face water accumulation for a long time, and the phenomenon of mud turning mud. Obviously, paying attention to and dealing with the foundation rainfall is an important part of ensuring the normal construction of the foundation pit. Well point system to reduce the groundwater level method, the construction is simple, the operation technology is relatively easy to grasp, after the precipitation remains dry, easy to construct, has now become an effective method in the construction of aquifer soil. However, the change of groundwater is complex. When well-point precipitation is used, there must be a full understanding of the laws of groundwater. Comprehensive consideration should be given to various factors such as the type, thickness, recharge conditions, permeability, and engineering requirements of the aquifer; With proper well-point equipment and operation management techniques, careful planning and reasonable arrangements can be made to achieve the desired desired results. The design of well point precipitation has a certain gap between theoretical calculation and practical application. It needs to be continuously enriched and improved through practice. Therefore, when adopting well-point precipitation, it is necessary to select a reasonable plan for the sake of time, place, and project, so as to guarantee the quality of deep well point precipitation.