The Settlement Analysis of Soft Ground Improved by Vacuum-Surcharge Preloading Method

2009 ◽  
Author(s):  
Yan-hui Ge ◽  
Shu-cai Li ◽  
Chuan-fu Li ◽  
Guo-fu Sun ◽  
Ming-Bin Wang
Keyword(s):  
Soft Ground ◽  
Surcharge Preloading ◽  
Preloading Method ◽  
Settlement Analysis

Settlement Analysis of Soft Ground Replacement under Earthquake

2012 ◽  
Vol 166-169 ◽  
pp. 2379-2382 ◽  
Author(s):  
Zhong Liu ◽  
Shu Hong An ◽  
Rong Hong Yuan ◽  
Fei Li
Keyword(s):  
Time History ◽  
Vertical Displacement ◽  
Response Analysis ◽  
Soft Ground ◽  
Positive Contribution ◽  
Foundation Soil ◽  
Time History Response ◽  
Dynamic Time ◽  
Settlement Analysis ◽  
Different Thickness

The dynamic time-history response analysis method was employed to analyze the dynamic response of soft ground replacement with sand-gravel cushion. The deformation distribution of soft ground replacement with different thickness sand-gravel cushion was investigated under seismic wave. The results reveal that the bearing and asti-deformation capacity can be improved effectively for replacement sand-gravel cushion under earthquake loads by increasing the thick of cushion. The vertical displacement of foundation soil decreases gradually with the increase of the thick of cushion. The practice shows that replacement sand-gravel cushion provides a positive contribution to the aseismic effect of foundation soils mass. The present research can provide some references to similar projects.

Improvement of very soft ground by a high-efficiency vacuum preloading method: A case study

2016 ◽  
Vol 35 (5) ◽  
pp. 631-642 ◽  
Author(s):  
Gang Zheng ◽  
Jingjin Liu ◽  
Huayang Lei ◽  
M. S. Rahman ◽  
Zaikun Tan
Keyword(s):  
High Efficiency ◽  
Soft Ground ◽  
Vacuum Preloading ◽  
Preloading Method

Soil improvement for a storage yard using the combined vacuum and fill preloading method

2005 ◽  
Vol 42 (4) ◽  
pp. 1094-1104 ◽  
Author(s):  
S.-W Yan ◽  
J Chu
Keyword(s):  
Ground Improvement ◽  
Soil Improvement ◽  
Undrained Shear Strength ◽  
Foundation Soil ◽  
Surcharge Preloading ◽  
Clay Slurry ◽  
Degree Of Consolidation ◽  
Preloading Method ◽  
Undrained Shear

This paper presents a case study of using the combined vacuum and fill surcharge preloading method to improve the foundation soil for a storage yard at Tianjin Port, China. A vacuum load of 80 kPa was applied for 4-8 weeks before fill surcharge was added in stages. The site to be improved was recently reclaimed using dredged clay slurry. Both the consolidated clay slurry fill and the seabed soils were very soft. After the combined vacuum and fill surcharge preloading, the ground settled more than 1 m. The average degree of consolidation achieved was more than 80%. The undrained shear strength of the soil increased twofold. The water content of the soil also decreased substantially. The soil improvement procedure using the combined vacuum and fill surcharge preloading method and the instrumentation scheme are described, the field monitoring data are presented and analyzed, and methods to estimate the degree of consolidation and several other issues related to the combined preloading method are discussed.Key words: case history, consolidation, ground improvement.

Quality Control Indexes Study of Vacuum Combined with Fill Surcharge Preloading Method

2012 ◽  
Vol 209-211 ◽  
pp. 1459-1462
Author(s):  
Shang Yu Han ◽  
Li Hong
Keyword(s):  
Vacuum Pressure ◽  
Soil Consolidation ◽  
Vertical Load ◽  
Foundation Soil ◽  
Load Pressure ◽  
Surcharge Preloading ◽  
Soil Settlement ◽  
Consolidation Effect ◽  
Preloading Method

The consolidation effect of vacuum combined with fill surcharge preloading always influenced by many factors including vacuum pressure, vertical load pressure and vertical drainage depth. As the way to improve the reliability of the method, based on the soil consolidation mechanisms and actual data getting from the laboratory test and in-situ test, the main indexes of the method were studied in this paper. The test results show that the ratio of the vacuum pressure and vertical load pressure can cause difference soil settlement-deformation, if the ratio close to 1 the consolidation effect of the foundation can be gradually advanced. The soil outside the embankment always has displacement to reinforcement region in the upper depth of the foundation soil when the vacuum pressure equals to the vertical load pressure.

New Construction Method of Marine Cofferdam on the Soft Ground in Tideland

2012 ◽  
Vol 446-449 ◽  
pp. 1785-1790 ◽  
Author(s):  
Ai Min Liu ◽  
Shu Wang Yan
Keyword(s):  
Construction Method ◽  
Soft Ground ◽  
Vacuum Preloading ◽  
Obvious Effect ◽  
New Town ◽  
New Construction ◽  
Preloading Method

The marine cofferdams of the littoral new town in Lianyungang were constructed with geotextile bags filled with solidified soil and the soft ground under the cofferdams was treated by under water vacuum preloading method. The dimension of the cofferdams was reduced while the foundation kept stable. And the cofferdams were configurated with the geotextile bags filled with solidified soil, the silt clay was utilized adequately, the sand stone resource was saved and protected, the obvious effect was achieved. This method can be promoted in construction of marine cofferdams.

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