Abstract
Hydrological tracer testing is an effective way to determine the law of recharge and the transport of groundwater. In karst collapse mine water treatment, the hydrological tracing test can determine information such as the runoff velocity and the pattern of underground runoff, so that targeted grouting becomes possible. In this paper, NaCl was used as a tracer, and the content of the tracer was determined by the chloride ion selective electrode method. The NaCl concentration–time curve was plotted, and we obtained a tracer test method that can determine the runoff of the karst quantificationally. The method can quantificationally obtain the groundwater transport velocity, runoff pattern, and connectivity. This combination of grouting rate, grouting pressure, and setting time realized the localized targeted grouting and achieved a significant water damage control effect.
Highlights
In the hydrological tracer test, changes in the tracer quantity in underground migration are determined by means of conductivity or titration, and the underground runoff is determined
The targeted grouting method is based on the parameters and curve form obtained by the hydrological tracer test, determining the form of underground runoff, the maximum runoff velocity, average runoff velocity, and the close relationship between the dosing point and the water point
After determining the underground runoff conditions by hydrological tracer testing, the grouting rate needs to be calculated for the grouting pressure, and the initial setting time of the material is tested to determine the optimal grouting scheme
Summary
The problem of water inrush is one of the most serious and typical geological disasters [1]. The hydrological tracer test has become an effective means to ascertain the groundwater force connection, determine the mainstream guidance of groundwater, and calculate the groundwater flow velocity [9,10,11,12,13]. The drilling often connects with the main pipeline through a crack, and the key to determining whether the water passage can be blocked or not is that the grout enters the water passage pipeline smoothly and has certain anti-erosion ability. The hydrological tracer test is used to analyze the relationship between the crack and the water passage, which is of guiding significance for the grouting material. An anti-scouring grouting material suitable for different water flow speeds and different setting times can be selected to realize the targeted control of the karst water inrush. The ratio of the injection point to the recovery point can determine the proportion of the connected fracture (effective fracture), which has a certain guiding significance for single-hole grouting
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