Single-hole observation device and method for double layers of underground water levels of karst mountainous area
A technology for groundwater level and mountainous areas, applied in measuring devices, lubrication indicating devices, liquid/fluid solid measurement, etc., can solve problems such as heavy drilling workload, save drilling costs, save survey work time, and reduce quantity Effect
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Embodiment 1
[0052] Please refer to figure 1 and figure 2 , This embodiment provides a single-hole observation device for double-layer groundwater levels in karst areas, which is mainly used for observation of double-layer groundwater levels in karst mountainous areas. The above device includes a sleeve 2 and an inner tube 1 , the lower end of the sleeve 2 is provided with a sealing assembly 3 for sealing; the inner tube 1 is arranged in the sleeve 2 and passes through the sealing assembly 3 . The whole device is installed in a pre-drilled stepped hole, the inner pipe 1 is used for detecting the groundwater level of the lower layer, and the sleeve pipe 2 is used for detecting the groundwater level of the upper layer.
[0053] Please continue to refer figure 1 and figure 2 , with reference to image 3 Specifically, the lower end of the large-diameter hole of the stepped hole extends into the middle and lower part of the water-resistant layer; for a relatively thick water-resistant lay...
Embodiment 2
[0057] Please refer to Figure 5 , with reference to figure 1 and figure 2 ; This embodiment provides a method for single-hole observation of double-layer groundwater levels in karst mountainous areas, which is mainly used for observing double-layer groundwater levels.
[0058] Before construction, after determining the location of the hydrogeological drilling hole, use a geological drilling rig to drill the hole with a diameter of 127mm, and use the matching casing 2 to protect the hole. If the stratum is thicker, it can enter the stratum for 5-10m. Then the diameter is reduced to 91mm, forming an obvious step shape in the hole. Continue to drill, and drill holes fully into the second permeable layer (i.e. the lower permeable layer) until the drilling depth reaches the design hole depth. It is necessary to initially estimate the lowest groundwater level elevation of the lower layer, and the bottom elevation of the design hole depth should be lower than the minimum water l...
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