真空预压条件下地下水位测试新方法及其应用

New method for measuring groundwater level under vacuum preloading

由于技术缺陷,常规敞口式水位测管法并不适合于真空预压条件下地下水位的测试,用其测得的水位并非负压状态下的真实水位。介绍一种适合于真空预压条件下地下水位测试的新方法。该方法由于采用内外管的独特设计,成功解决了水位管内部与大气相通的问题,同时配以磁环浮标可以直接测量地下水位位置,不需借助其他测试手段。通过与常规方法的现场对比试验,充分说明新方法具有工作原理清晰,装置制作简单,测量时无真空压力泄露,测试结果直观可靠等优点,所以用该法测得的负压条件下加固区内的地下水位结果更具说服力。最后对该方法尚存在的问题进行了探讨,并提出改进建议。

Because of their technical disadvantages, the conventional methods are unsuitable to measure the groundwater level in the soft ground reinforced by vacuum preloading. The results obtained by the conventional methods are not the true groundwater level under negative pressure. A new method for measuring the groundwater level is introduced. The special design of inside and outside pipes is used to prevent the normal atmospheric pressure from entering the inside of the pipes. In addition, the groundwater level can be directly measured by the magnetic ring floating on the water surface. Based on the field tests for comparing the new method with the conventional methods, it is concluded that the working principles and apparatus of the new method are simple, with the advantage of no loss of vacuum pressure, so the groundwater level measured by the new method is reliable. Finally, some problems of the new method are discussed and some improvements are presented.