Tunnel lining structure model test device and test method

Abstract

The invention discloses a tunnel lining structure model test device and test method. The test device comprises a pressure cabin, a stress loading mechanism, a lining layer and a monitoring system. Thepressure cabin comprises a front cabin door, a cabin body and a back cabin door; the lining layer may be poured by plain concrete, reinforced concrete or ring anchor prestressed concrete or the like,and in addition, a surrounding rock simulation layer may be arranged between the lining layer and an inner wall of the cabin body; the stress loading mechanism comprises a loading chamber, a pressuretube, a pressure collection valve and a pressure water pump; the monitoring system comprises a monitoring instrument and a data collection instrument; and the test method comprises the manufacture and installation of the lining layer, the installation of the stress loading mechanism and the monitoring system, loading of different internal and external loads, and data collection and processing analysis.

Description

technical field [0001] The invention relates to a tunnel lining structure model test device and test method, which is suitable for the research on the strength, deformation characteristics and safety of the lining structure under the complex boundary conditions of underground engineering, and can also be used for the combined bearing characteristics and lining of different types of linings and different grades of surrounding rocks. Indoor simulation research on cracking characteristics and internal and external water seepage characteristics. Background technique [0002] In recent years, with the construction of a large number of water diversion projects and road projects, the application of various types of tunnels has become more and more extensive. Due to the particularity of the tunnel structure and load bearing, as well as the imperfection of design theory and calculation methods, there are still many problems. The key issues that need to be further studied and solved, ...

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Problems solved by technology

[0003] At present, the domestic research methods for this series of problems mainly use numerical methods for simulation calculation and analysis, while the work foundation for indoor model tests is relatively weak, and the results obtained are limited. At the same time, there are several shortcomings in the existing indoor model tests: ① For The indoor model test research of the tunnel is mostly focused on the selection of construction methods, the verification of the bearing capacity of the lining support structure design, the distribution of the tunnel seepage field, the joint bearing characteristics of the lining and surrounding rock, and the distribution and expansion of cracks after the lining cracks. ②The scale range of the existing indoor models is 1:25~1:10. Compared with the actual size of the tunnel, the scale of the existing models is relatively small, and it is difficult to accurately restore the components of the lining structure; ③There are many materials in the model Similar materials with different proportions such as sand, lime, cement, and fly ash are used, and the mechanical properties and permeability properties of actual concrete materials are quite different; simulation, so that the simulated stress conditions of the lining and surrounding rock are not completely consistent with the stress conditions under the actual working conditions; The use of real water pressure loading leads to a discrepancy between the cracking characteristics of the lining and the actual situation. It is an on-site high-pressure water-filling prototype test. The main problems in this type of test are the difficulty in plugging the hole section of the on-site test, which is prone to seepage damage and internal water leakage, and the difficulty in replenishing water in the high-pressure water-filling test, which is difficult to improve or maintain. high internal water pressure

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