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

Pending Publication Date: 2018-12-21
GUIZHOU SURVEY & DESIGN RES INST FOR WATER RESOURCES & HYDROPOWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When there are two or more layers of groundwater table, multiple boreholes are generally arranged to observe the water level elevation of different aquitards; this makes the drilling workload larger

Method used

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  • Single-hole observation device and method for double layers of underground water levels of karst mountainous area
  • Single-hole observation device and method for double layers of underground water levels of karst mountainous area
  • Single-hole observation device and method for double layers of underground water levels of karst mountainous area

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Experimental program
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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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Abstract

The invention provides a single-hole observation device and method for double layers of underground water levels of a karst mountainous area, and belongs to the technical field of water conservancy and hydropower engineering. The above device comprises an inner pipe, a casing pipe and a sealing component, wherein the casing pipe is clung to the hole inner wall of the broken rock mass section of aborehole hole; the inner wall of the casing pipe and the outer wall of the inner pipe are arranged at intervals; the inner pipe comprises an upper end and a lower end, wherein the lower end of the inner pipe extends out of the casing pipe and enters to be below the lowest water level of the lower layer; and the sealing component is sheathed to the inner pipe. The above method is combined with theabove device, and before the above device is installed, a stepped hole is drilled in advance. When the above device and the above method detect double layers of underground water levels, the amount ofboreholes is reduced, a purpose of accurately testing double layers of stable underground water levels of the karst mountainous area is achieved, drilling cost is saved, meanwhile, time for investigation work is saved, and the device and the method have good economic benefits.

Description

technical field [0001] The invention relates to the technical field of water conservancy and hydropower engineering, in particular to a device and method for single-hole observation of double-layer groundwater levels in karst areas. Background technique [0002] With the rapid development of water conservancy projects in my country, more and more high dams and large reservoirs are built in karst mountainous areas. The complex karst hydrogeological conditions make it very difficult to form reservoirs. After the reservoirs are impounded, there are many water leakage phenomena. Related to complex karst hydrogeology. In geological structures in karst mountainous areas, there are often double-layered groundwater levels separated by relatively aquifers, and these water levels have a greater impact on reservoir formation. Generally, the mixed water level or the uppermost water level of the double-layer groundwater level is observed in a single hole, and the groundwater level elevat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F23/00
CPCG01F23/00
Inventor 武兴亮袁代江刘子金高奋飞谢红建侯迪杨序烈
Owner GUIZHOU SURVEY & DESIGN RES INST FOR WATER RESOURCES & HYDROPOWER
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