Based on the application of construction technique of improved soft ground reinforcement with dewatering and preloading for the vacuum well point in practical engineering,the effect of this technique,the effective reinforcement depth and the change of effective stress were studied through observing the construction settlement in practice and analysing from theory.
The paper states the design, construction technology and experience for the consolidation of soft soil ground base with heaped pre compression method and vacuum well point dropping heaped combied pre compression method with the combination of the actual project.
The practice proves that even if the stage of the construction is not so sufficient, provided the application is proper, the heaped pre compression method and vacuum well point dropping heaped combined pre compression method can effectively reduce the settlement after the construction and eliminate the jumping at the bridge head in a certain geological condition.
It is seen thatgrouting and vacuum well point are useful in reducing post construction settlements and the change of longitudinal grade alongthe roadway.
Based on the analysis of stress path characteristics,influence depth of reinforcement and mechanism of consolidation deformation,this paper reveals the characteristics of stress and deformation in the bridge-slope subgrade reinforced by vacuum well-point dewatering combined with equal preload. By comparison of the settlements determined by conventional grouting method and by proposed method,it is proved that the proposed method is reasonable and economical.
in comparison with dranage inside deep excavation,dewatering with well\|point outside can deduce active earth pressure and increase passive earth pressure,which helps to slope stabilization of deep excavation.
In this paper, new methods was put forwarcl to control the water hazard in mines on the condition that the rock formation of seepping water into mines is the low permeability aquifer. The methods are vacuum well discharge method, air injection increasing pressure discharge methods and the combination method of two ways metioned above. Furthermore, the principles of the methods were elaborated, the efficiency of the methods was demonstrated and the implementation processes of the technology of the methods were...
In this paper, new methods was put forwarcl to control the water hazard in mines on the condition that the rock formation of seepping water into mines is the low permeability aquifer. The methods are vacuum well discharge method, air injection increasing pressure discharge methods and the combination method of two ways metioned above. Furthermore, the principles of the methods were elaborated, the efficiency of the methods was demonstrated and the implementation processes of the technology of the methods were designed.
in this paper presented are the results of monitoring of settlement of ground. layer-wise settlement. ground waterlevel and pore water pressure for approaches to bridge abutments on soft soil foundation. Settlements. settlement distributionalong the roadway. compression in the vertical section and the change of pore water pressure have been studied. It is seen thatgrouting and vacuum well point are useful in reducing post construction settlements and the change of longitudinal grade alongthe roadway. and that...
in this paper presented are the results of monitoring of settlement of ground. layer-wise settlement. ground waterlevel and pore water pressure for approaches to bridge abutments on soft soil foundation. Settlements. settlement distributionalong the roadway. compression in the vertical section and the change of pore water pressure have been studied. It is seen thatgrouting and vacuum well point are useful in reducing post construction settlements and the change of longitudinal grade alongthe roadway. and that settlement lies mainly in the grey mucky layers.
! Foundation pit project of Zhengda Plaza in Pudong New Area is one of the macro-type deep foundation pit engineerings in soft soil foundation of Shanghai area. By adoping"layered dewatering method for pipe well points linking with light-type vacuum well points ",the problems of drainage, pressure relief and float-resistance have been solved. moreover.it not only have saved the cost but also satisfied the requests for stability of foundation pit bracing structure and the environmental protection.
真空井
vacuum well
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