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对饱和软黏土中11.0m的深基坑进行了主动土压力与深层位移监测。基坑竖向支护体采用钻孔灌注桩,水平向采用两道钢筋混凝土内支撑。实测主动土压力大于按照朗肯主动土压力公式的计算值,实测值约是计算值的1.20倍,阳角处的主动土压力实测值与计算值的比值大于正常位置的比值,约是正常处的1.13倍。实测主动土压力与墙后土体水平位移关系符合双曲线规律。达到主动土压力状态时,对应的墙后土体水平位移约为开挖深度的0.1%。
Active earth pressure and deep displacement monitoring were performed on a 11.0m deep foundation pit in saturated soft clay. The vertical support body of the foundation pit uses cast-in-place bored piles, and horizontally uses two reinforced concrete internal supports. The measured active earth pressure is greater than the calculated value based on Rankine’s active earth pressure formula. The actual measured value is approximately 1.20 times the calculated value. The ratio of the measured value to the calculated value of the active earth pressure at the positive corner is greater than the ratio of the normal position, which is approximately normal. 1.13 times. The relationship between the measured active earth pressure and the horizontal displacement of the soil behind the wall conforms to the hyperbolic law. When the active earth pressure is reached, the corresponding horizontal displacement of the soil behind the wall is about 0.1% of the excavation depth.