DEFORMATION CONTROL TECHNOLOGY OF BRIDGE PILE FOUNDATION IN LARGE SECTION LOESS TUNNEL AT CLOSE DISTANCE
Taking the Luochuan Tunnel of the West Extension Railway through the S304 Provincial Highway Heimugou Middle Bridge as an example,for high-speed railway large-section loess tunnels when they penetrate the bridge pile foundation at close range.The characteristics of difficult construction deformation control and large construction risk.Measures such as the guidance and modification of the passage road,the use of the three-step temporary arch method(waist beam type)for tunnel excavation,the strengthening of the inner support and the anchor pipe with lock feet are proposed.The on-site monitoring and measurement data showed that there was no first-level warning state,the surface,bridges and pile foundations are in normal condition,it solves the safety of pile foundation construction of existing highway bridges under the close-range undersection of high-speed railway large-section loess tunnels,A set of large-section loess tunnel close down bridge pile foundation deformation control technology was formed,it can provide technical reference for similar engineering construction.
large section loess tunnelwear it down close-rangebridge pile foundationdeformation control
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