主动抗浮技术理论及工程应用

The theory and engineering application of active anti floating technology

建筑工程不可避免面临工程抗浮安全性的关键技术问题。以主动抗浮新技术为切入点,基于Laplace方程推导出承压水完整井排水条件下底板排水卸压理论计算公式,结合原位卸压监测曲线对卸压滞后性、影响半径R和公式兼容性进行了修正,提出了压力降落计算的基础公式,并形成了排水卸压的设计计算内容和施工工艺。最后通过在成都天府国际健康服务中心1组团的工程实践表明:该工程建筑物地下室底板大范围位于泥质砂岩中,为弱透水性地层。主动排水卸压抗浮实施后各点位水头低于设计抗浮设防水位;相比抗浮锚杆技术,主动抗浮技术节约成本约40%;土建施工仅为1个月,未占用主序工期,整体工期提升近60%。

Construction engineering inevitably faces key technical issues in terms of anti floating safety.This article takes the active anti floating technology as the starting point and derives the theoretical calculation formula for bottom plate drainage and pressure relief under the condition of complete well drainage of pressurized water based on the Laplace equation.Combined with the in-situ pressure relief monitoring curve,the pressure relief hysteresis,influence radius R,and formula compatibility are corrected,and the basic formula for pressure drop calculation is proposed.And formed the design calculation content and construction process for drainage and pressure relief.Finally,the engineering practice at Group 1 of Chengdu Tianfu International Health Service Center shows that the basement floor of the building is located in a large area of muddy sandstone,which is a weakly permeable layer.After the implementation of active drainage pressure relief and anti floating measures,the water head at each point is lower than the designed anti floating water level;compared to anti floating anchor technology,active anti floating technology saves about 40%in cost;the civil construction period is only one month,without occupying the main construction period,and the overall construction period has been increased by nearly 60%.