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Simulation multi-gap assembled medium tunnel seepage test method

A testing method, multi-void technology, applied in the direction of measurement device, permeability/surface area analysis, suspension and porous material analysis, etc., can solve the problem of groundwater dynamic change law that has not been tried to study water inrush over time, and does not consider the influence of tunnel construction , unable to achieve dynamic research and other issues

Active Publication Date: 2016-02-24
SICHUAN UNIV
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Problems solved by technology

The existing indoor physical model test uses layered tamping of sand as the seepage medium within the model boundary to conduct seepage tests, which cannot simulate the geological environment with anisotropic seepage characteristics, and does not consider the impact of tunnel construction. The tunnel model is The fixed model cannot realize dynamic research. Therefore, no attempt has been made to study the time-varying law of water inflow during tunnel excavation and the dynamic changing law of surrounding groundwater, nor has it considered the dynamic changing law of groundwater after tunnel excavation and lining treatment

Method used

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  • Simulation multi-gap assembled medium tunnel seepage test method
  • Simulation multi-gap assembled medium tunnel seepage test method
  • Simulation multi-gap assembled medium tunnel seepage test method

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Embodiment

[0068] Such as Figure 1 to Figure 13 As shown, taking the main fracture angle of 30° in the excavation of a railway tunnel section as an example, the test method process for simulating the seepage of multi-void composite medium tunnels is described in detail.

[0069] The boundary of the tunnel model adopts a scale of 1:300. Taking the tunnel axis as the center, go left and right 300m, down 200m, buried depth 250m, total 45m front and back, the model size is length×width×height=2.0m×1.5m×0.15m. The tunnel is a double-line tunnel, generalized to a single-line tunnel, with a diameter of 30m and a model size of 10cm. Except for a side and top surface perpendicular to the tunnel axis, the remaining model boundary interfaces are made of concrete layers. The water tank 3 and the water inlet of the water tank are arranged on both sides of the model boundary 1, and the corresponding overflow port 5 and the water inlet pipe 6 are arranged. The filling medium in the multi-void combi...

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Abstract

The present invention relates to the field of hydrogeological research, and discloses a simulation multi-gap assembled medium tunnel seepage test method, first, a model boundary and a tunnel simulation device are produced, the model boundary is filled with a multi-gap assembled medium with same equivalent seepage characteristics as tunnel surrounding natural rock and soil, in the filling process, the tunnel simulation device with a water outlet port is placed in the multi-gap assembled medium; both sides of the model boundary are respectively provided with water grooves with water overflow ports, the water grooves and the model boundary are in internal communication by water inlet pipes, vertical and horizontal piezometric tubes are arranged in the model, the bottoms of the water grooves and the model boundary are respectively provided with first and second water discharge ports, the tunnel simulation device simulates the whole process of tunnel excavation and lining brick processing, and water outlet amount of the water outlet port, water discharge amount of the second water discharge port, and water level elevation changes of the vertical and horizontal piezometric tubes at a corresponding moment can be recorded in the process, so that the groundwater dynamic movement rules before and after tunnel excavation and changes of water flowing into the tunnel over time can be researched.

Description

technical field [0001] The invention relates to a method for testing and researching seepage of tunnels under complex hydrogeological conditions, and mainly relates to the study of the seepage characteristics of multi-void geological units such as pores, fissures, and dissolved crevices during the excavation process of rock tunnels and the law of water gushing changing with time. Background technique [0002] In the field of geotechnical engineering, tunnel excavation will not only lead to changes in surrounding rock stress, but also cause seepage problems such as water gushing, water inrush, and mud inrush, thereby changing the groundwater environment and even affecting the deterioration of the regional ecological environment. Therefore, the study of tunnel seepage has important guiding significance for practical engineering. At present, there are three main research methods for this kind of problem, one is on-site monitoring, the other is computer simulation and theoretica...

Claims

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Application Information

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IPC IPC(8): G01N15/08
CPCG01N15/08G01N2015/0034
Inventor 符文熹冯迪赵敏
Owner SICHUAN UNIV
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