Method for forecasting water inflow of railway karst tunnel water filling cavity through dewatering test method

Abstract

The invention relates to a method for forecasting water inflow of a railway karst tunnel water filling cavity through a dewatering test method, which is characterized by comprising the following steps of, firstly, utilizing an advance geological probe hole of the karst tunnel water filling cavity as a dewatering hole to dewater, controlling the dewatered quantity through installing a valve at the hole opening of the dewatering hole, and installing a pressure gauge to measure water pressure variation in the dissolved cavity; secondly, regularly observing and recording the dewatered quantity and the water pressure, and establishing a mathematical function model of a trend of the dewatered quantity and the water pressure varying along with time; thirdly, utilizing the trend model to forecast future values of the corresponding dewatered quantity and the corresponding time under different water pressures; and fourthly, determining a water pumping and drainage facility according to dynamic trend analysis results of the dewatered quantity, the cavity dewatering time and the like, drawing up a corresponding cavity treatment scheme or measure, and arranging a construction period of continuously tunnelling a dewatered cavity and tunnel. The method has the advantages of simpleness, practicability, rapidness and reliable test result and can timely make pointed reference to supply accurate data for treating a water-rich cavity by adopting an energy release depressurization method during tunnel design and construction.

Description

Technical field: [0001] The invention relates to a method for predicting the water inflow of a dissolved cavity, in particular to a method for predicting the water inflow of a water-filled dissolved cavity of a railway karst tunnel by a water discharge test method. This technology is suitable for predicting the water inflow of water-filled cavities in deep buried complex karst tunnels and provides a reliable technical basis for the tunnel treatment of cavities by energy release and pressure reduction. Background technique [0002] It is difficult to determine the amount of water inflow from the water-filled cavity of railway karst tunnels (i.e., the storage capacity of karst water, including its volumetric storage (static storage) and groundwater runoff (dynamic storage)], which is affected by the irregular spatial form of the cavity itself, and the influence of groundwater. It is controlled by many factors such as the amount of supply and the excretion of the cavity, "invis...

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Problems solved by technology

[0003] Before the present invention was proposed, there was no effective method t

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