Test device and method for simulating dynamic influence of rainfall on karst tunnel seepage

Abstract

The invention relates to the field of tunnel seepage model tests and discloses a test device for simulating the dynamic influence of rainfall on karst tunnel seepage. The device comprises a test modelbox device used for simulating a karst area and an internal tunnel of the karst area and is positioned above the test model box device; a rainfall device used for simulating rainfall, a non-contact full-displacement field measuring device used for shooting the test model box device and recording a seepage path, the upper part of the test model box device is connected with the simulated terrain, the simulated terrain is positioned below the rainfall device, and the boundary of the simulated terrain is matched with the boundary above the test model box device. The device is beneficial to improving the accuracy of the model test. The invention further comprises a test method of the device. The test method specifically comprises the following steps: topographic data extraction; determining test parameters; manufacturing a test model; installing a test device; stratum, tunnel and terrain simulation; adding a coloring agent; water level simulation; rainfall simulation; dynamic collection oftest data. The method can obtain the seepage path of the seepage field.

Description

technical field [0001] The invention relates to the field of tunnel seepage model tests, in particular to a test device and method for simulating the dynamic influence of precipitation on the seepage field of tunnels in karst areas. Background technique [0002] With the development of my country's transportation construction, tunnel projects are gradually being constructed in areas with complex geological conditions, among which karst water-rich areas occupy a certain proportion. In karst areas with complex hydrogeological conditions and well-developed fissures and pipelines, the source of groundwater around the tunnel will not only be in the aquifer, but also due to the large number of vertical karst pipelines, the recharge effect of atmospheric rainfall on groundwater cannot be ignored. More importantly, in the tunnels in karst areas, the speed of atmospheric rainfall replenishment is fast and the time-consuming is short, which can easily lead to relatively insufficient d...

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Problems solved by technology

[0007] However, on the one hand, the above patent results did not consider topographical factors and stratum karst characteristics, and could not simulate the surface water catchment effect and the flow characteristics of karst pipelines, making it difficult for the test results to truly reflect the actual case; on the other hand, the above patent results all focused on The test simulation of atmospheric rainfall during tunnel construction, and the disease statistics show that the disease cases caused by rainfall after the tunnel is completed also occupy a large proportion, so it is necessary to carry out test simulation for the tunnel after completion

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