Geosynthetic sensor array
a sensor array and geosynthetic technology, applied in the direction of instruments, structural/machine measurement, excavations, etc., can solve the problems of large environmental damage, large area, and significant water leakage, and achieve the effect of cost reduction, substantial environmental harm and thus cost reduction
Inactive Publication Date: 2020-06-18
IMAGINE INTELLIGENT MATERIALS LTD
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Benefits of technology
The patent describes a sensor matrix that can act as the electrical earth to inspect the resistance or capacitance of geomembranes, and can also measure pressure, strain, temperature, and water levels. This is achieved by using electrically conductive geosynthetic that is insulated from adjacent lengths in the layer. The technical effect of the patent is to provide a versatile and effective tool for inspecting geomembranes.
Problems solved by technology
They are often used on a large scale, potentially involving many thousands of square meters of area.
Even a small hole in the liner can result in significant water leakage, especially over time.
In some cases, for example mining waste water, where the water is contaminated and is being retained or directed to protect the environment, even small amounts of leakage are significant and can cause substantial environmental harm and thus cost to rectify.
In such applications, the integrity of the liner is critical.
However, current technologies for measuring such properties are complex and expensive, requiring sophisticated sensors to be wired directly into the environment.
Consequently, few of those technologies are economically viable except in the highest value environments.
Method used
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[0036]Sensing in geotechnical fields (e.g. civil engineering) covers a broad range of requirements from ultra-high precision monitoring of very high value assets, such as bridges and concrete dams, to measurement of temperatures in waste deposits or water leaks, to roads and rail monitoring. Often the high value measurements are referred to as “structural health monitoring”. Very few cost-effective options are available for large-scale monitoring of lower value assets where sensor installation and monitoring costs can become a substantial proportion of the asset value.
[0037]Low cost, large-area sensors made using geotextiles have been demonstrated to be reliable and cost-effective. However, this type of sensing over longer time-frames is difficult. This invention allows an array of conductive geosynthetics to act as large-area sensors with the accuracy and precision required for use in geotechnical and construction environments.
[0038]FIG. 1 is a schematic representation of an array ...
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Abstract
A geosynthetic sensor that incorporates an arrangement of a first layer of lengths of electrically conductive geosynthetic and a second layer of lengths of electrically conductive geosynthetic where each said length undergoes a change in electrical resistance or capacitance when subject to changes in any one or more of: pressure; strain; water content; or temperature.
Description
TECHNICAL FIELD[0001]The invention relates to the field of monitoring pressure, strain and / or moisture in civil engineering applications. In particular, the invention relates to an electrically conductive geosynthetic and a method for using same.BACKGROUND OF THE INVENTION[0002]Geosynthetics are synthetic products used to stabilise terrain in civil engineering applications including: airfields; bank protection; canals; coastal engineering; dams; debris control; embankments; erosion; railroads; retaining structures, reservoirs; roads; sand dune protection; slope stabilisation; storm surge; stream channels; swales and; wave action.[0003]The main categories of geosynthetics are: geotextiles, geogrids, geonets, geomembranes, geosynthetic clay liners (GCL), geofoam, geocells and geocomposites.[0004]Geotextiles are widely used as protective layers in civil engineering. They help stabilise terrain, act as filtration media and cushioning. They are often used on a large scale, potentially in...
Claims
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IPC IPC(8): G01B7/16E02D17/20G01L1/20G01M5/00D01F9/12
CPCD01F9/12E02D17/202G01M5/0083G01B7/18G01N2203/0617G01L1/205E02D31/00G01L1/00G01D5/24G01D5/16
Inventor AITCHISON, PHILLIP
Owner IMAGINE INTELLIGENT MATERIALS LTD