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针对富水地区桩基工程施工中桩孔内渗水量较大的特点,考虑桩基孔内抽水导致水位下降而引起桩周地表沉降,分析一种潜水完整井稳定渗流下的桩周地表沉降计算方法。根据渗流理论分析推导了降水渗流下桩基周围土体单元的有效应力增量;采用二维平面范围内进行二重积分计算的方法,分析了渗流作用下孔内降水引起的桩周地表沉降计算公式。以具体工程为依托,分别采用现场实测与公式计算的方法对桩周地表沉降进行预测,结果表明实测值与计算值整体上较为接近,但在距离桩孔边缘3m范围内,实测值大于计算值,而5m范围外的计算值与实测值较为接近,同时沉降值随着与桩孔边缘距离的增大而减小。
Aiming at the characteristics of large seepage water in the pile hole during the pile foundation construction in the water-rich area, the settlement of the pile surface is caused by the drop of the water level caused by pumping in the hole of the pile foundation. method. Based on the seepage theory, the effective stress increment of soil mass around the pile foundation under the seepage flow is deduced. By using the method of double integral calculation in the two-dimensional plane, the calculation of surface settlement of the pile around the pile caused by seepage is analyzed formula. Based on the concrete project, the settlement of the ground around the pile is predicted by on-the-spot measurement and formula calculation respectively. The results show that the measured value and the calculated value are close to each other as a whole, but the measured value is larger than the calculated value within 3m from the edge of the pile hole , While the calculated value outside 5m is close to the measured value and the settlement value decreases with the distance from the edge of pile hole.