Subway tunnel subsider production method capable of achieving different sedimentation distribution guarantee rates

Abstract

The invention belongs to the technical field of civil engineering, and discloses a subway subsider production method used for generating and predicting ground surface subsider curves caused by subway underground excavation or shield tunnels. The subway subsider production method mainly includes the steps of subsider curve generation, subsider envelop curve generation and sedimentation prediction parameter calculation, and specifically includes the steps of obtaining the distances between all monitoring points and the central line of a tunnel, obtaining the sedimentation values of the monitoring points, calculating a regression subsider curve, setting the envelop ratios of the monitoring points, conducting adjustment with the regression subsider curve as the foundation to obtain the maximum envelop curve and the minimum envelop curve, setting the diameter and the burial depth of the tunnel, and calculating the maximum subsider coefficient, the minimum subsider coefficient, the regression subsider coefficient, the maximum area loss rate, the minimum area loss rate and the regression area loss rate of each of the three curves. According to the method, the distribution rule and the distribution range of the ground surface sedimentation caused by underground excavation or shield tunnels are formed by taking actual monitoring data as the foundation and considering the probability distribution of settlement, the prediction parameter of the distribution range is formed, and the method is high in practicability, convenient to use and wide in application prospect.

Description

technical field [0001] The patent of the invention belongs to the technical field of civil engineering, and is used for the generation of settlement tanks caused by ground subsidence during the construction of subway tunnels. Background technique [0002] With the development of rail transit construction, the surface subsidence caused by underground excavation or shield construction has always been concerned by the engineering community. At present, most of the predictions of surface subsidence by engineers are based on practical experience, and lack of systematicness and inheritance. . Through theoretical or numerical simulation (whether it is finite element, finite difference or discrete element), only the distribution range and distribution law of settlement can be reflected. It is difficult to predict the quantity, and the parameter adjustment has a large dispersion, which is finally attributed to empirical judgment. Due to the complexity of geotechnical engineering (un...

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Problems solved by technology

However, at present, the specific implementation steps of this method are cumbersome, the practicability is not high, and it cannot be popularized to engineers and technicians, and the obtained curve is only one, which cannot truly reflect the actual situation on site

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