Device and method for continuous test of ground surface settlement induced by shield tunnel excavation

Abstract

The invention discloses a device and a method for a continuous test of ground surface settlement induced by shield tunnel excavation, the device can be spliced in any length, and according to the requirement of an actual test purpose, two or more independent sub-devices can be spliced through a connecting device to form a target device. And each sub device comprises a steel frame, a toughened glass observation plate, channel steel, a bottom water inlet pipe, a movable pulley and a connecting device. According to the invention, multiple test working conditions are carried out under a single variable, error interference of temperature difference between working conditions, operation and the like and model test of influence of shield tunnel excavation on ground surface settlement are reduced, and the accuracy of test results is improved; according to the invention, the change rule of ground surface settlement during shield tunnel excavation is explored, and the test efficiency is significantly improved; according to the invention, the water inflow and the water discharge can be controlled, and the law research of shield tunnel excavation on stratum and earth surface soil deformation under saturated and unsaturated states of sandy soil, clay and gravel soil can be simulated; and the deformation rule of the soil body in the shield tunnel excavation process can be conveniently discussed.

Description

technical field [0001] The invention relates to the field of tunnel excavation surface settlement, in particular to a test device and method for researching ground surface settlement induced by shield tunnel excavation. Background technique [0002] With the gradual increase of urban traffic pressure, the shield tunneling method is widely used in the construction of urban subway tunnels due to its advantages of fast construction and small impact on the ground surface. Due to the complexity of urban geological conditions, it is inevitable to excavate shield tunnels in different strata. During shield excavation, it is necessary to consider not only the influence of different excavation depths on the stratum and surface, but also the influence of shield tunnel excavation on the stratum and surface under different geological conditions. [0003] In order to study the impact of shield tunnel excavation on the stratum and surface under different geological conditions, theoretical...

AI Technical Summary

Problems solved by technology

For example: different geological conditions, different buried depths, etc. During the test process, it is generally necessary to refill the soil for the next set of tests after the previous set of tests is completed. The test cycle is long and consumes a lot of manpower and material resources.

Secondly, the length of the excavation device is single and cannot be changed. At the same time, there may be large differences in the parameters of each shield excavation and the surrounding environmental conditions of the test.

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