Method for estimating five-dimensional evolution of spatial form of ground subsider caused by tunnel construction

Abstract

The invention discloses a method for estimating five-dimensional evolution of a spatial form of a ground subsider caused by tunnel construction. The method comprises the following steps: firstly, judging the application condition of a Peck formula of a to-be-researched region; the shield cutter head area A, the volume loss rate eta caused by excavation of each ring in the longitudinal direction of the tunnel and the stratum loss rate Vi of the transverse unit length of the tunnel are obtained; and then correcting a traditional Peck formula to obtain a Peck formula in a five-dimensional space, and combining the data to obtain a dynamic change rule of the earth surface along with time and shield tunneling. According to the scheme, a time factor and a step length factor are introduced on the basis of a ground surface three-dimensional settling tank by taking a five-dimensional space effect of ground surface settlement as a line, and a Peck formula in a five-dimensional space is established, so that the dynamic development rule of the ground surface settling tank along with construction disturbance and a time process can be more accurately described in the five-dimensional space; not only is the defect of the ground surface settlement in the aspect of dynamic change rule research solved, but also the prediction of the ground surface settlement is more refined, and the result is more accurate.

Description

technical field [0001] The invention belongs to the field of shield tunnel construction risk control, and in particular relates to a method for predicting the five-dimensional evolution of the spatial form of surface settlement tanks caused by tunnel construction. Background technique [0002] With the rapid development of my country's economy and the continuous expansion of urban scale, the number of subways built in cities is gradually increasing, and the problem of surface subsidence disasters caused by the construction of subways has become increasingly prominent, which will not only cause dislocation and damage to urban lifelines such as underground pipelines, but also cause Severe damage to ground structures has become a hot issue of concern to the whole society, and its mechanism and effective control are also difficult issues in scientific research in related fields around the world. [0003] On the basis of a large number of measured data, Peck proposed that the surf...

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Problems solved by technology

[0008] Aiming at the disadvantage that the traditional Peck formula cannot predict the surface settlement during the construction stage, the present invention proposes a method for predicting the five-dimensional evolution of the surface settlement trough space shape caused by tunnel construction, and realizes the joint calculation of the surface settlement along with the included time factor and shield step size factor. assessment under action

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