Method for carrying out shield tunnel prototype test by using middle air shaft

Abstract

The invention belongs to the field of engineering, and particularly relates to a method for carrying out a shield tunnel prototype test by utilizing an intermediate air shaft, which mainly comprises the following steps of: constructing an air shaft enclosure and a structure; breaking a tunnel portal; plain concrete and a soil layer are backfilled in the well; burying monitoring components in the stratum; the shield enters the air shaft, and first to sixth hoops are arranged; loading the upper part of the tunnel layer by layer; the upper layer of the tunnel is unloaded to the original real estate elevation; four reinforcing hoops are arranged; performing layered excavation and unloading to a tunnel vault; a temporary support frame is additionally arranged in the test duct piece; soil around the tunnel is excavated in a layered mode, and the form and thickness of a synchronous grouting inclusion are recorded; dismantling the test duct piece, removing the temporary support frame, and constructing a well joint structure; and constructing the residual main body structure in the air shaft. By adopting the test method, the middle air shaft space of the shield tunnel is fully utilized as a natural site of a prototype test, the construction cost is not increased while the construction and stress characteristics of the shield tunnel under the construction working condition are simulated, and the shield construction and test safety is ensured.

Description

technical field [0001] The invention relates to the field of underground engineering, in particular to a method for conducting prototype tests of shield tunnels by using intermediate air shafts, which is suitable for shield tunnel mud penetration, mud film formation, formation settlement, simultaneous grouting, and segment stress. , Experimental study of tunnel diseases. Background technique [0002] With the rapid development of my country's economic construction and the continuous improvement of the level of urbanization, shield tunnel construction methods have become more and more widely used, and more and more problems have arisen during the construction and operation of shield tunnels, such as instability of the excavation surface. , Excessive stratum settlement, segment damage, tunnel leakage and other problems have brought great threats to the construction safety and structural service performance of shield tunnels. [0003] In response to the above problems, the indu...

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Problems solved by technology

However, the full-scale prototype test using the intermediate air shaft is not a simple process of burying and re-construction of test components. Considering the shield tunneling construction, filling and excavation in the well, installation and removal of segments, and implementation of the internal structure of the air shaft, etc., How to ensure the safety of shield construction and test while ensuring the reliability of the test is an important issue

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