Water leakage simulating and measuring system of tunnel in centrifugal field

Abstract

The invention belongs to the field of tunnel engineering research in geotechnical and underground engineering, in particular to a water leakage simulating and measuring system of a tunnel in a centrifugal field. A hollow cuboid is arranged at the middle part of a model case which is divided into a model side and an accessory side by a partition board; a sealing top cover is arranged at the top of the model side, a tunnel is positioned on the model side, and a hydraulic valve and a liquid storage cylinder are positioned on the accessory side; the partition consists of a steel plate, a longitudinal reinforcing rib and a transverse reinforcing rib; the steel plate is provided with a hole with threads; a bidirectional joint is sleeved in the hole with the threads and respectively connected with the tunnel tube and the hydraulic valve through liquid conduits arranged at two ends of the bidirectional joint; the hydraulic valve is connected with the liquid storage cylinder; a pore water pressure gauge is arranged at the bottom of the liquid storage cylinder; the top surface of the liquid storage cylinder is provided with a pore; and the pore water pressure gauge passes through the port and is connected with measuring equipment through a lead. The invention can simulate actual water leakage condition of the tunnel in a high-speed centrifugal field and better reproduce the actual soil body stress level. The equipment and instrument required by the invention can be realized under the prior technical level; and the invention has low requirement on equipment of a centrifugal lab, can be conveniently manufactured and popularized and better serves scientific research.

Description

technical field [0001] The invention belongs to the field of tunnel engineering in geotechnical and underground engineering, and in particular relates to a simulation and measurement system for tunnel leakage water in a centrifugal field. Background technique [0002] Shanghai is located on the coast of the East China Sea, and there are deep soft clay deposits widely distributed underground. It has fine soil particles (generally 0.1-0.002mm), low shear strength, high water content (w=40%), natural Large void ratio (e max =1.5), high sensitivity (S r =4-5), high compressibility and rheology and other remarkable engineering properties. In addition, the groundwater level is very high, and groundwater can be seen at 0.5-1m below the surface. Shield tunnels have long been affected by the harmful effects of surface water and groundwater. During construction and operation, seepage water will cause uneven settlement of the structure, bend the tunnel, and cause the tunnel joints t...

AI Technical Summary

Problems solved by technology

The method of numerical simulation is relatively mature, but the main shortcomings are as follows: (1) The physical and mechanical parameters of the soil have a great influence on the calculation results, but due to the limitation of instruments and equipment, it is difficult to obtain accurate soil parameters

(2) The numerical simulation method is difficult to completely simulate the stress history and boundary conditions of the soil, resulting in deviation of the results

The shortcomings of on-site monitoring mainly include: (1) Due to the limitations of instruments and equipment and human observation factors, the on-site results have certain deviations

(2) On-site monitoring requires a lot of manpower, material resources and financial support, especially for long-term settlement monitoring, which is unrealistic and time-sensitive

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