Testing system and method for seepage field model of tunnel in construction and operation periods

Abstract

The invention discloses a testing system and method for a seepage field model of a tunnel in construction and operation periods, and the testing system comprises a seepage field model box body and data collection device. The top of the seepage field model box body is provided with a pressure meter, and the bottom of a side wall of the seepage field model box body is provided with an overflowing hole. The top and bottom of a side wall of the seepage field model box body are respectively provided with an upper water inlet of the model box and a lower water inlet of the model box. Two opposite side walls are respectively provided with a tunnel hole. Two ends of each fixed steel reinforcement cage are fixed on inner walls of the edges of the tunnel holes, and the fixed steel reinforcement cages are respectively wrapped by a soil isolating layer. Peripheral bolts of flange plates are fixed on outer walls of edges of the tunnel holes, and the internal and external steel reinforcement cages are fixed between the two tunnel holes through the flange plates. Inner holes of the flange plates are provided with cover plates. A construction-period soil isolating plate is connected between the internal and external steel reinforcement cages in a threaded manner. A tunnel face water-blocking plate is fixed in the internal steel reinforcement cage in a threaded manner. Moreover, the construction-period soil isolating plate and the tunnel face water-blocking plate are located on the same vertical section. The system can test the conditions of the seepage field of the tunnel conveniently, accurately and truly in the construction and operation periods under the action of the seepage field.

Description

technical field [0001] The invention relates to a tunnel seepage field model test system and a test method thereof during construction and operation periods, and belongs to the field of civil engineering tests. Background technique [0002] Long-term leakage of water in the tunnel may lead to a large loss of groundwater outside the tunnel, a drop in the groundwater level, and depletion of surface water sources, accompanied by soil erosion, vegetation destruction, and ground subsidence. Landslides will accelerate the corrosion of anchor rods and arches, and at the same time erode the ancillary facilities in the tunnel. In addition, the accumulated water on the road will also deteriorate the driving environment, affect driving safety, and damage the quality of the road surface. It can be seen that solving the problem of tunnel water leakage will help ensure the safety of the tunnel structure, prolong its service life, and protect the surrounding ecological environment. The cor...

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Problems solved by technology

The test chamber includes a closed pressure-bearing box, a tunnel model composed of circular PVC pipes, and a water storage container. It can study the influence of the drainage type segment lining on the pore water pressure and discharge rate of the surrounding rock, but it cannot reflect the dynamic head and water flow rate. The impact of variable water head, and the grouting layer which has a significant impact on tunnel construction cannot be simulated

[0006] (3) The patentee is Shandong University. Chinese patent application number 201110412569.5 introduces a fluid-solid coupling model test system and its test method for subsea tunnels, including a high-strength rigid test structure frame, a high-strength tempered glass sealed box, a monitoring display system, The computer-controlled platform and pressurized water tank can simulate plane and quasi-triaxial fluid-solid coupling model tests, but it cannot realize the simulation of grouting reinforcement layers and linings with different permeability coefficients, nor can it predict the water inflow and drainage of tunnels under different water heads

[0008] 1. The water head of the above-mentioned model test system is usually constant and cannot be adjusted, and the effect of simulating the groundwater level is single. It is difficult to effectively support the construction of the entire tunnel, and it is impossible to analyze the seepage field of urban tunnels, mountain tunnels and submarine tunnels with different groundwater levels.

[0009] 2. The tunnel construction period is an important stage of tunnel construction. Understanding the changes in the seepage field during the tunnel construction period, predicting the water inflow, testing the water pressure distribution of the surrounding rock-support system and the influence of grouting on the face of the tunnel will affect the smoothness of the tunnel project. Completion is critical and none of the above test systems can complete the seepage field analysis during the tunnel construction phase

[0010] 3. The change of the permeability coefficient and thickness of the surrounding rock grouting reinforcement area around the tunnel has a great impact on the underground seepage field, and will also directly change the water pressure and inrush (drainage) of the tunnel structure. The existing model test devices have not considered or It cannot be adjusted, even if it can be adjusted, it can only be realized by replacing the pre-embedded soil in the box. The operation is cumbersome, causing great interference to the test, and it takes too long, which is not conducive to repeated tests

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