Seepage test system for a shield tunnel under joint effect of elastic sealing gasket, soil and water

Abstract

The invention relates to a seepage test system for a shield tunnel under joint effect of elastic sealing gasket, soil and water. The seepage test system comprises an air pump system, a main test system, a pressurized water tank system and a data acquisition system, wherein the main test system comprises a main test box with an opening in the bottom, a sealing top cover on the upper portion of the main test box, a detachable pressurized air bag connected on the top cover, a precise pressure-regulating valve and a digital display compression gauge fixed on the top cover, and a soil container arranged on the lower part of the main test box, and provided with a mini porous hydraulic gauge and a mini earth pressure meter. The bottom of the main test box and two L-shaped adjustable base plates are connected in a seal manner through elastic sealing gasket on the lower part of the main test box and the L-shaped base plate elastic sealing gaskets. The two L-shaped adjustable base plates are connected through leading screws, and have grooves for fixing the L-shaped base plate elastic sealing gaskets. The seepage test system makes a test more controllable and allows more comprehensive factors to be taken into consideration during test.

Description

technical field [0001] The invention relates to a shield tunnel leakage test system in which elastic sealing pads, soil and water act together, which can be used for simulation of shield tunnel segment leakage, soil erosion, water leakage and sand leakage in the field of underground engineering. Background technique [0002] Shield tunnels are generally assembled from many impermeable concrete segments, and rubber gaskets are used for waterproofing. However, due to factors such as uneven settlement of the tunnel and improper construction methods, it is easy to cause partial damage during the construction and operation of the tunnel. Water leakage or even sand leakage, if not handled properly, will cause disasters, causing huge environmental impact and economic losses, such as the accidents of St. Petersburg Line 1 and Shanghai Metro Line 4. Accidents of water leakage, erosion, water leakage and sand leakage occur frequently in tunnels, so it is very important to conduct mech...

AI Technical Summary

Problems solved by technology

First of all, the leakage of segment joints is the result of the joint action of water, soil, and elastic gaskets. Soil particles sandwiched between gaskets will affect the waterproof performance of elastic gaskets. The existing test methods cannot analyze this effect; The erosion phenomenon of soil particles after leakage along with soil loss; finally, the further development of leakage will lead to water leakage and sand leakage at joints, and there is no mature test equipment for the large deformation of soil caused by water leakage and sand leakage

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