Supplementation analysis method for foundation pit crown beam horizontal displacement monitoring data

Abstract

The invention discloses a supplementation analysis method for foundation pit crown beam horizontal displacement monitoring data. The supplementation analysis method comprises the following steps thatmonitoring point deformation data and a support axial force measured value are acquired, a calculation model is constructed by adopting abaqus, horizontal displacement values at intersection points ofa crown beam and each support are supplemented, a crown beam horizontal displacement continuous deformation smooth curve is acquired by utilizing spline interpolation on the basis of abaqus modelingdata, and deformation monitoring data is enriched. According to the supplementation analysis method, the horizontal displacement point of the crown beam is supplemented through conversion of the supporting axial force, then the maximum displacement value is predicted through a finite element or a Spline interpolation fitting curve, so that the deformation value of the section, without the measuring point, of the crown beam is comprehensively judged, the dangerous section where the overlarge displacement value possibly exists is determined, safety early warning work of foundation pit monitoringis facilitated, and thus the safety of the foundation pit is ensured to a greater extent; and the supplementation analysis method has the advantages of being economical, easy to operate and high in reliability, and has extremely high application value in the technical field of civil engineering deformation measurement.

Description

technical field [0001] The invention relates to the technical field of civil engineering deformation measurement, in particular to a supplementary analysis method for horizontal displacement monitoring data of foundation pit crown beams. Background technique [0002] The horizontal displacement of the foundation pit crown beam is one of the key parameters to determine the stability of the foundation pit support structure. The current monitoring method is mainly to first select the local feature points of the crown beam by the design unit to set the deformation monitoring point, and then give the result according to the force check of the structure. Corresponding alarm indicators, and then the monitoring unit uses optical instruments such as measuring robots or theodolites to measure deformation, and can also select displacement sensors and other measurement methods to measure the deformation of the measuring point according to the site. Since the design unit mainly selects t...

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Problems solved by technology

Since the design unit mainly selects the key weak positions of foundation pit crown beams to set deformation monitoring points based on design calculations and experience, which has a certain degree of discreteness. In combination with the complexity of geotechnical engineering, the set monitoring points may not be located at the actual maximum deformation. Section, so it will cause certain security risks

In order to comprehensively grasp the horizontal displacement and deformation of the foundation pit crown and beam, one usually adopts the method of adding deformation monitoring points in the area with large deformation to meet the needs of monitoring data analysis. The absolute deformation at the beginning of pit excavation; secondly, a three-dimensional scanner can be used to scan and model the foundation pit, and the deformation of each position of the crown beam of the foundation pit can be grasped. This method has low precision and requires high measurement accuracy The foundation pit monitoring project is not applicable

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