Monitoring and Analysis of Deformation Laws of Deep Foundation Pit Considering Spatial Effect

Abstract Starting with the analysis of the foundation pit design, the support structure of foundation pit was designed and checked combined with a large deep foundation pit project in Shijiazhuang; According to the current codes, the monitoring scheme considering spatial effect is established; The fiber grating sensor was introduced in the monitoring of the lateral pressure of foundation pit slope, which could realize the on-line, dynamic and real-time monitoring. The field test results showed that spatial effect was significantly reflected in the deformation, earth pressure and other aspects: the foundation pit slope of central settlement is 40%~65% bigger than corner ,horizontal displacement in the middle is 28%~42% larger than corner; The amplification of the positive angle to the settlement and horizontal displacement reached 48% and 11% respectively; The maximum horizontal displacement of the deep soil is located at the depth of 15%~35% below the excavation face; lateral earth pressure of Slope changed with volatility. The lateral earth pressure value of each measuring point increased with the increase of time. At a distance of 0.2 times of the excavation depth below the ground, the measured values of the center, external corner and inside corner were smaller than the calculated values of 42.10%,82.46% and 108.77% respectively; At a distance of 0.5 times of the excavation depth below the ground, the measured value of the middle was 35.21% greater than the calculated. The values of external corner and inside corner were 49.06% and 29.21% smaller than the calculated value respectively. At a distance of 0.8 times of the excavation depth below the ground, the measured values of the center, external corner and inside corner were greater than the calculated values of 6.29%, 40.41% and 23.27% respectively; The settlement of surrounding ground surface was larger when the foundation pit slope settlement was larger.

Keywords deep foundation, pit, spatial effect, deformation monitoring.

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Engineering Journal: Monitoring and Analysis of Deformation Laws of Deep Foundation Pit Considering Spatial Effect

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