Abstract
A finite element model is established to study the settlement control technology of the ballastless track of high-speed railway under the shield of shallow buried tunnel. In particular, the reinforcement mechanism and construction control technology of the Metro Jet System (MJS) method for horizontal reinforcement under complex geological conditions (medium coarse sand and strong permeable layer) are discussed. The results showed that when the ground is not reinforced, the shield tunnel directly passes through the high-speed railway, and the settlement caused by the construction of the railway gene tunnel directly above the tunnel has greatly exceeded the limit of the settlement control standard. Due to the limitations of site, planning and construction conditions, the horizontal jet grouting pile of MJS construction method is selected as an auxiliary measure through comprehensive comparison. After the completion of the MJS construction, the maximum settlement of the subgrade is 30 mm, and the settlement of the high-speed railway subgrade is about 25 mm.
Highlights
As the core technology of underground space development, shield tunneling technology has been widely used in the fields of energy and transportation tunnel construction
It can be seen from the figure that the settlement caused by the construction of the railway gene tunnel directly above the tunnel has exceeded the limit of the settlement control standard of 10 mm
Compared with the direct shield tunneling without reinforcement, the settlement value of high railway foundation is reduced by about 50 %
Summary
As the core technology of underground space development, shield tunneling technology has been widely used in the fields of energy and transportation tunnel construction. When the subway tunnel needs to run under the high-speed railway with a maximum speed of 350 km/h It is very important and of practical significance to study settlement control measures to ensure the safety of important facilities such as high-speed railway in construction area. STUDY ON CONTROL MEASURES OF THE INFLUENCE OF SHALLOW BURIED TUNNEL EXCAVATION ON THE SUBGRADE SETTLEMENT OF HIGH SPEED RAILWAY IN OPERATION. QIYU SONG method for horizontal reinforcement under complex geological conditions (medium coarse sand and strong permeable layer) are discussed. It is the first engineering application of the new technology of MJS horizontal reinforcement operation of high-speed railway subgrade in China, and it is the deepest horizontal reinforcement project of MJS in China.
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