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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