Device and method for measuring underground water LeveL by adopting opening cLosed method

Abstract

The invention discLoses a device for measuring underground water LeveL by adopting an opening cLosed method. The device comprises verticaLLy arranged outer and inner pipes and a steeL ruLer settLementgauge, wherein a cLosed annuLar space is formed between the outer pipe and the inner pipe, a magnetic fLoater is arranged in the annuLar space, the outer pipe is a corrugated teLescopic pipe providedwith a steeL wire, the inner pipe consists of an upper-portion main pipe and a Lower-portion Limiting guide pipe, the upper end of the Lower-portion Limiting guide pipe is provided with a measuring top cap, the upper-portion main pipe is inserted into the Lower-portion Limiting guide pipe, the Lower end is seaLed, the upper end of the outer pipe is seaLingLy connected with seaLing fiLm, a side waLL is provided with water seeping hoLes, the upper end of the outer pipe is connected with a seaLing top cap, and a measuring head of the steeL ruLer settLement gauge is arranged in the upper-portionmain pipe. The invention aLso discLoses a method appLying the device to measure the underground water LeveL. The reLativeLy accurate underground water LeveL eLevation of a soft soiL foundation in thereinforcing process can be more simpLy and convenientLy obtained under the situation that the soiL Layer soLidification infLuence is considered and it is ensured that a water LeveL pipe is not communicated with the atmosphere.

Description

technical field [0001] The invention belongs to the field of engineering monitoring, and relates to a closed method groundwater level measuring device and method in the process of strengthening soft soil foundation by vacuum preloading method (or vacuum surcharge combined preloading method). Background technique [0002] When the vacuum preloading method strengthens the soft soil foundation, if the groundwater level drops, it will be the double reinforcement effect of vacuum preloading and precipitation preloading; if the groundwater level rises, it will be the effect of the difference between the above two; if the groundwater level remains unchanged, Therefore, the accurate measurement of groundwater level is related to the reinforcement effect of vacuum preloading, and also directly affects the understanding of the mechanism of vacuum preloading. The common groundwater level measurement method of the closed method is: first set up a water level pipe device, which is compos...

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Problems solved by technology

This method can basically solve the problem that the water level pipe is connected to the atmosphere, but it is difficult for this device to ensure that the vacuum degree inside and outside the water level pipe is consistent, and because the impact of soil consolidation on the test results is not considered, it is difficult to ensure (Especially the vacuum surcharge combined preloading method) always ensure that the water level pipe is not connected to the atmosphere; at the same time, it is necessary to measure the elevation of the upper end of the inner pipe every time the groundwater level is measured to obtain an accurate groundwater level elevation, which is relatively cumbersome

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