Monitoring well for monitoring water and air pressure of karst collapse and well completion process thereof
A technology for karst collapse and monitoring wells, which is applied in the direction of boreholes/well components, measurement, drilling equipment, etc., and can solve the problem that the monitoring of gas pressure changes in karst pipelines has not been carried out, and the formation and evolution of karst pipelines and karst collapses in karst areas have not been considered. issues of particularity
Active Publication Date: 2014-08-27
INST OF KARST GEOLOGY CAGS
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[0003] Due to the hidden and sudden characteristics, there is no complete monitoring plan for the monitoring work in karst subsidence areas at present. The site selection and well completion of the monitoring wells still follow the experience of non-karst areas, and karst pipelines and karst areas in karst areas are not considered. The particularity of the formation and evolution of the collapse, and the monitoring of gas pressure changes in karst pipelines has not been carried out in the prior art
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[0035] Such as figure 1 As shown, the monitoring well used for monitoring the water vapor pressure of karst subsidence according to the present invention includes a monitoring borehole, and a protective pipe 1 is arranged in the monitoring borehole, and the described protective pipe 1 is threaded by a PVC pipe and a PVC water filter pipe. connected, wherein the PVC pipe is located at the upper part of the PVC water filter pipe, and the connection between the PVC pipe and the PVC water filter pipe corresponds to the soil-rock interface 5 of the monitoring borehole, and the connection between the PVC pipe and the PVC water filter pipe is also A water stop ring 2 made of kelp is bound; cement mortar 3 is filled in the gap between the outer wall of the PVC pipe of the protection pipe 1 and the inner wall of the monitoring borehole, and the inside of the protection pipe 1 can be installed for measuring karst For the sensors of various index data of water and gas in the pipeline, a ...
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The invention discloses a monitoring well for monitoring water and air pressure of karst collapse and a well completion process thereof. The monitoring well comprises a monitoring drilling hole; a protecting pipe, which is formed by the connection of a closed pipe and a water penetration pipe, is arranged in the monitoring drilling hole; the part in which the closed pipe and the water penetration pipe are connected corresponds to the earth-rock boundary in the monitoring drilling hole and is also provided with a water ring that is prepared through water stopping materials; cement mortar is filled in a gap between the part above the water ring on the outer wall of the closed pipe of the protecting pipe and the inner wall of the monitoring drilling hole; a sealing cover is arranged at an opening in the top end of the protecting pipe. The well completion process is simple and easily to be operated, and the monitoring well completed by the process is able to disclose a karst cave or a fissure zone and block the top end of the protecting pipe, so as to avoid the influence of outside environment on water and air pressure in the monitoring well, and as a result, the purpose of really reflecting the variation information of water and air pressure in a karst cave pipeline is reached, and basis is provided for studying, monitoring and early warning karst collapse.
Description
technical field [0001] The invention relates to a monitoring well, in particular to a monitoring well for monitoring karst subsidence water gas pressure and a well forming process thereof. Background technique [0002] Karst collapse is a common geological disaster in karst areas. It happens from time to time both abroad and in our country, causing buildings to fall or be damaged, causing traffic interruption, and bringing heavy losses to life and property. One of the main causes of the collapse is the change of the water vapor pressure in the karst pipeline in the karst area, especially the large, rapid or frequent change. [0003] Due to the hidden and sudden characteristics, there is no complete monitoring plan for the monitoring work in karst subsidence areas at present. The site selection and well completion of the monitoring wells still follow the experience of non-karst areas, and karst pipelines and karst areas in karst areas are not considered. The particularity o...
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IPC IPC(8): E21B47/06E21B7/00
Inventor 蒋小珍雷明堂蒙彦戴建玲管振德吴远斌罗伟权贾龙
Owner INST OF KARST GEOLOGY CAGS