真空混合管井降水技术研究与应用

Study and application of compound dewatering technique of vacuum tube well

在含有深厚软饱水土层、地层互层多、降深大的基坑降水工程中,为解决浅部黏性土层中的界面残留水、下部粉性土层中的微承压水、砂土层中的承压水问题,以上海某深基坑降水工程为例,将真空与管井降水技术相结合,提出由多级滤管组成的真空混合管井降水技术。通过数值模拟,确定了过滤管位置及长度,在保证降深的前提下使抽水量最小,与类似地层工程相比,该项技术降水效果明显更好。

Based on a dewatering engineering case of a deep foundation pit in Shanghai,by combining vacuum and tube well dewatering techniques,a compound dewatering technique of multilevel filter tubes made up of vacuum tube well was proposed. To dewater the interface residual water in clayey soil of sallow layer,the slightly confined water in clayey soil of the aquitard,and the confined water in sandy soil of the confined aquifer in the deep foundation pit dewatering project where the deep soft soil is water saturated and the interbeded stratum is complicated,we determined the position and length of the filter tubes through numerical simulation,which can ensure the pumped water minimization on the premise of ensuring the dewatering depth. Compared with other dewatering engineering,the technique proposed here has better efficacy.