增压防堵真空预压加固吹填土对比试验研究

基于天津新港北铁路集装箱中心站工程试验段的对比试验,探讨增压防堵真空预压和常规真空预压、直排式真空预压的区别,研究了增压防堵真空预压和直排式真空预压加固效果的差异。试验结果表明:增压防堵真空预压采用手型接头将PDPS整体式排水板和钢丝软管相连作为水平排水系统,替代常规真空预压的中粗砂垫层,提高了排水板内真空强度和真空作用能效,能有效地降低工程造价,且更符合环保的要求;增压防堵真空预压较直排式真空预压在初期沉降速率更快,相同工期内沉降更大,地基加固效果更显著。

Comparative Experiment Study on the Strengthening of Dredger Fill Using Vacuum Preloading Method Based on Pressurization and Anti-clogging Technology

In combination with the comparative experiment at a experiment section of Tianjin Xingang North railway container center station,the paper discussed the differences among three kinds of vacuum preloading methods: the vacuum preloading method based on pressurization and anti-clogging technology, the traditional vacuum preloading method,and the direct vacuum preloading method. Also the paper researched the difference of strengthening effects between the direct vacuum preloading method and the vacuum preloading method which is based on pressurization and anti-clogging technology. The experiment study results are as follows:( a) By using special joints to connect the PDPS integrated drain board with the steel wire hose so as to function as a horizontal drainage system,instead of the medium-grained sand cushion adopted in traditional vacuum preloading method,the vacuum preloading method based on pressurization and anti-clogging technology can improve the vacuum strength and efficiency of drain board,can effectively reduce project cost,and can much more accord with environmental protection requirement.( b) Compared with direct vacuum preloading method,the vacuum preloading method based on pressurization and anti-clogging technology can present a faster settlement velocity in initial period and a larger settlement volume in the same working period.( c) After being strengthened by the vacuum preloading method based on pressurization and anti-clogging technology,the strengthening effect on subsoil is much more effective.