Deep horizontal displacement monitoring method for soil slope of foundation pit based on coordinate measurement

Abstract

The invention relates to a deep horizontal displacement monitoring method for a soil slope of a foundation pit based on coordinate measurement and belongs to the field of horizontal displacement monitoring. The method comprises the following steps: S1, a total station instrument is freely set at any point P outside the foundation pit, any two reference points C1 and C2 are observed, and coordinates of point P are calculated; S2, all deep horizontal displacement monitoring points are set on an SC1 monitoring section; S3, the total station instrument is used to perform continuous observation onall the monitoring points SC1-i and other reference points on each monitoring section, horizontal oblique distance between point P to other reference points and the monitoring points SC1 can be obtained, horizontal angles formed between a starting edge PC1 and other reference points and the monitoring points can be obtained, and the coordinates of other reference points and the monitoring points can be calculated; S4, horizontal distance between the reference point and the monitoring points and a component of the horizontal distance on a vertical foundation pit slope are calcualted; S5, a deephorizontal displacement change amount and a cumulative horizontal displacement change amount are calculated. According to the method disclosed in the invention, no drilling is needed, convenient construction can be realized, and observation data can truly reflect the deep horizontal displacement change amount, and a visual monitored deformation amount is achieved.

Description

technical field [0001] The invention relates to a method for monitoring the deep horizontal displacement of foundation pit soil slope based on coordinate measurement, and belongs to the technical field of horizontal displacement monitoring. Background technique [0002] The deep horizontal displacement of the foundation pit slope is divided into the deep horizontal displacement of the retaining wall (pile) and the deep horizontal displacement of the soil. A method of observing the horizontal displacement at various depths in the vertical direction with a bore inclinometer. The inclinometer tube in the support pile is completed together with the pouring construction of the support pile. There is no gap between the inclinometer tube and the pile body, and the deformation of the inclinometer tube completely represents the deformation of the support pile. The horizontal displacement represents the horizontal displacement of the supporting structure at each depth in the vertical...

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Problems solved by technology

[0003] After the setting of the inclinometer pipe is completed, the inclination measurement of the borehole is used to monitor the deep horizontal displacement, such as figure 1 and figure 2 As shown, this observation method is to use the inclinometer to observe the horizontal displacement of the inclinometer tube at every 0.5m in the vertical direction. Since there are many gaps between the inclinometer tube and the borehole wall, although the sand and gravel However, limited by the construction method or construction conditions, it is difficult to backfill the gap between the inclinometer tube and the soil compactly, and the deformation of the inclinometer tube is not completely consistent with the deformation of the supporting slope. The inclinometer observation The deep horizontal displacement data cannot fully reflect the deformation of the foundation pit soil slope

In addition, the use of inclinometer pipes requires drilling, which is inconvenient for construction

If the construction environment does not meet the requirements of drilling construction, the inclinometer tube cannot be installed, and the deep horizontal displacement monitoring of the soil slope of the foundation pit cannot be carried out at this time

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