Pseudo-Static Approach to Single Rammer Energy Calculation in Dynamic Compaction of Saturated Soft Soil Foundations

2012 ◽  
Vol 204-208 ◽  
pp. 747-750
Author(s):  
Ji Feng Liang ◽  
Feng Wang ◽  
Guo Bao
Keyword(s):  
Soft Soil ◽  
Static Method ◽  
Dynamic Compaction ◽  
Energy Calculation ◽  
Calculation Formula ◽  
Engineering Project ◽  
Static Approach ◽  
Effective Reinforcement

The article puts forward a single-rammer energy calculation formula based on pseudo-static method which is to be applied in the dynamic compaction trials of saturated soft soil foundations. A comparison between the formula and the dynamic compaction effective reinforcement range formula is made. Then, data from actual engineering project are applied to the formula, and the calculated results are consistent with the testing results. That is to say, the formula can facilitate the forecast of single-rammer energy in dynamic foundation compaction.

Test Study on Effective Reinforcement Depth of Dynamic Compaction and Filling Replacement

2011 ◽  
Vol 368-373 ◽  
pp. 2550-2553 ◽  
Author(s):  
Wei Li ◽  
Chun Xiao Zhang ◽  
Peng Xiang Sun
Keyword(s):  
Bearing Capacity ◽  
Low Cost ◽  
Soft Soil ◽  
Dynamic Compaction ◽  
Reinforcement Effect ◽  
Large Area ◽  
Remarkable Effect ◽  
Ground Treatment ◽  
Test Study ◽  
Effective Reinforcement

Filling replacement combined with dynamic compaction is a very effective method to preprocess the soft soil to obtain larger bearing capacity. That not only has remarkable effect to improve soil bearing capacity, but also has some advantages, such as quick construction, simple equipment, low cost and so on. And that is appropriate for large area ground treatment engineering. The purpose of ensuring the reinforcement effect and saving the project cost, and providing references for the similar projects can be achieved through the test study on effective reinforcement depth of dynamic compaction and filling replacement.

Experimental Study on Dynamic Consolidation Method to Improve Saturated Soft Soil Foundation

2012 ◽  
Vol 188 ◽  
pp. 45-48
Author(s):  
Guang Qian Du ◽  
Chang Zhi Zhu ◽  
Xi Ping Zhang
Keyword(s):  
Pore Water ◽  
Soft Soil ◽  
Cone Penetration Test ◽  
Dynamic Compaction ◽  
Penetration Test ◽  
Cone Penetration ◽  
Soil Foundation ◽  
Soft Soil Foundation ◽  
Effective Reinforcement ◽  
Static Cone Penetration Test

A new technology of dynamic compaction method is successfully used to reinforce the saturated soft soil foundation. The field monitoring laws of lateral displacement of the foundation after dynamic compaction, the increasing and dissipation regularity of the excess pore water pressure are analyzed and discussed. The improvement effect is verified by static cone penetration test and loading test. The determination methods of effective reinforcement depth after dynamic compaction are put forward. The practice shows that, by field-testing methods, such as static cone penetration test and pore water piezometer test, to determine the effective reinforcement depth after dynamic compaction and other design parameters is reliable.

Study on the Changing Rule of Excess Pore Water Pressure during Dynamic Compaction

2011 ◽  
Vol 90-93 ◽  
pp. 2254-2257 ◽  
Author(s):  
Xiao Jing Li ◽  
Kai Yao ◽  
Shao Chun Zhu ◽  
Xiang Hong Pan
Keyword(s):  
Pore Water ◽  
Pore Water Pressure ◽  
Water Pressure ◽  
Test Area ◽  
Dynamic Compaction ◽  
Horizontal Distance ◽  
Excess Pore Water Pressure ◽  
The Third ◽  
Effective Reinforcement ◽  
Excess Pore

The changing rule of excess pore water pressure during dynamic compaction is important for construction. The following conclusions could be drawn by observing and analyzing the excess pore water pressure in test area. Under ramming strike energy of 2000kN•m, the best hit number during the 1~2 times is 8~9, the best hit number during the third time is 6~8. After compaction, the shallow excess pore water pressure is basically larger than the deep. The shallow excess pore water pressure needs more time to dissipate. The horizontal distance of the shallow excess pore water pressure is larger than that of the deep. During the dissipating process of the pore water pressure, we should pay attention to avoid vibration interference of load in the surface and prevent liquefaction of the powder soil. Under ramming strike energy of 2000kN•m, the biggest influence depth of dynamic compaction is 8～9m, the effective reinforcement depth is 6～8m. The conclusions can provide the theoretical basis for dynamic compaction construction.

Experiment Study on Reinforcement Effect of Composite Foundation in Saline Soils

2012 ◽  
Vol 622-623 ◽  
pp. 1721-1724
Author(s):  
Yu Zhang ◽  
Jian Kun Liu ◽  
Jian Hong Fang ◽  
An Hua Xu
Keyword(s):  
Design Theory ◽  
Soft Soil ◽  
Deformation Modulus ◽  
Dynamic Compaction ◽  
Engineering Practice ◽  
Saline Soils ◽  
Lake Area ◽  
Reinforcement Effect ◽  
Loading Test ◽  
Short Period

Using DPT and plate loading test, the paper analyzed different reinforcement effects from four different reinforcement technologies－gravel piles method, dynamic compaction method, dynamic compaction replacement (DCR) method and impact compacted method for Cha-Ge highway saline soils ground located in salt lake area, and got the following conclusions: (1) DCR method has the best reinforcement effect, and impact compacted method has the worst. There is a difference of 166.9 % between them. (2)Tamping energy is important on reinforcement effect to the last three methods and related directly to the values of the strengthened bearing capacity and deformation modulus. The DCR method and gravel piles method mentioned above are useful on reducing the settlement of natural saline soils foundation. In recent years, a lot of ground treatment methods are widely used to consolidate soft soil foundation for its short period and simple construction and so on. Numerous scientists and engineers have obtained useful results and experience from DCR and gravel piles foundation treatment of soft soil [1,2,3,4]. (e.g., A. G. Phear, S. J. Harris, 2008; Dong,Yan and , 2009; Huang, Zhou and He, 2006; Liu, 2006;); But the reinforcement in regions of saline soils, such as DCR hasn't been well researched; theoretical study is far behind engineering practice; so it is hard to build up the design theory and method..

Evaluating the Influence of Dynamic Compaction on Soft Soil Foundations Based on CPTu Testing

IFCEE 2021 ◽  
2021 ◽  
Author(s):  
Lulu Liu ◽  
Surya Sarat Chandra Congress ◽  
Guojun Cai ◽  
Anand J. Puppala
Keyword(s):  
Soft Soil ◽  
Dynamic Compaction

INNOVATIVE SOFT SOIL IMPROVEMENT BY VACUUM DE-WATERING AND DYNAMIC COMPACTION

2016 ◽  
Vol 3 (1) ◽  
Author(s):  
Tuncer B. Edil
Keyword(s):  
Large Scale ◽  
Ground Improvement ◽  
Soft Soil ◽  
High Vacuum ◽  
Cohesive Soil ◽  
Soil Improvement ◽  
Economic Benefits ◽  
Dynamic Compaction ◽  
Environmental Benefits ◽  
Improvement Method

Recently, an innovative soft soil improvement method was advanced in China by integrating and modifying vacuum consolidation and dynamic compaction ground improvement techniques in an intelligent and controlled manner. This innovative soft soil improvement method is referred to as “High Vacuum Densification Method (HVDM)” to reflect its combined use of vacuum de-watering and dynamic compaction techniques in cycles. Over the past ten years, this innovative soft soil improvement technique has been successfully used in China and Asia for numerous large-scale soft soil improvement projects, from which enormous time and cost savings have been achieved. In this presentation, the working principles of the HVDM will be described. A discussion of the range of fine-grained, cohesive soil properties that would make them ideal for applying HVDM as an efficient ground improvement method will be discussed. The economic benefits and environmental benefits of HVDM are elucidated.

Testing Study and Numerical Analysis of Dynamic Compaction on the Red Sandstone Rubble Soil

2011 ◽  
Vol 97-98 ◽  
pp. 151-155
Author(s):  
Xi Long Kuang
Keyword(s):  
Numerical Analysis ◽  
Test Data ◽  
Dynamic Compaction ◽  
Site Testing ◽  
Red Sandstone ◽  
Testing Data ◽  
Site Test ◽  
Effective Reinforcement ◽  
The Impact ◽  
The Relationship

The drop distance, times of dynamic compaction and other parameters are studied by on-site testing in order to analyse quantitatively the impact on effective reinforcement depth and radius of the red sandstone rubble soil. Large amounts of on-site test data shows that compactness standard is 93%, strong encryption range is 1.0～4.0m, the effective impact depth is 4～6m and the effective impact radius is 2.5～3.5m. At the same time, through comparison and verification the on-site testing data and numerical analysis, the relationship between times of dynamic compacting and sandstones subside is . Further more, it is revealed that dynamic compaction can restrain effectively the deformation of high fill embankment of the red sandstone rubble soil.

The Application of Vacuum Preloading Method in Soft Soil Foundation Underwater

2014 ◽  
Vol 580-583 ◽  
pp. 209-212 ◽  
Author(s):  
Yu Qin Feng ◽  
Lu Zhang
Keyword(s):  
Soft Soil ◽  
Effective Means ◽  
Construction Technology ◽  
Strength Index ◽  
Engineering Project ◽  
Vacuum Preloading ◽  
Before And After ◽  
Soil Foundation ◽  
Soft Soil Foundation ◽  
Preloading Method

On the basis of engineering project in coastland, this article analyzes the construction technology and reinforcement mechanism of vacuum preloading reinforces soft soil foundation. By indoor soil test of Reinforcement of soil before and after processing, comparing the change of the physical and shear strength index, verify vacuum preloading method underwater is effective means in handing soft ground and provide some experience for regional development and promotion of underwater application of vacuum preloading technology.

A Numerical Quasi-Static Method for the Identification of Frictional Dissipation in Bolted Joints

2012 ◽  
Author(s):  
Hugo Festjens ◽  
Gael Chevallier ◽  
Jean-Luc Dion
Keyword(s):  
Static Method ◽  
Bolted Joints ◽  
Mode Shapes ◽  
Bolted Joint ◽  
Lap Joint ◽  
Element Analysis ◽  
Linear Dynamics ◽  
Frictional Dissipation ◽  
Static Approach ◽  
Modal Coordinates

The hereby paper investigates a way to compute the micro-sliding dissipations that occurs in built-up structure using modal coordinates. This numerical method extends the former quasi-static approach to modal displacements through the use of finite element analysis. Considered structures are supposed to behave linearly except for a lumped bolted joint. It is firstly assumed that mode shapes of such structures are few affected by contact non-linearities in joint interfaces. This assumption allows to apply the normal eigenmodes of the linearized structure as boundary conditions on a model reduced to the bolted joint. The method relies on a corrected quasi-static analysis associated with the Masing rules. Those assumptions enables to avoid the considerable numerical expense due to non-linear dynamics. In order to improve the simulation, a mode shapes correction is also implemented. The formulation of the method is detailed and investigated on the classical lap-joint benchmark.

The Application of Dynamic Compaction Techniques Combining Plastic Drainage Plate to Improve Soft Soil Foundations in a College

2011 ◽  
Vol 117-119 ◽  
pp. 526-530
Author(s):  
Hai Yang Chen ◽  
Xiu Jun Liu ◽  
Jian Li ◽  
Xing Hua Hou
Keyword(s):  
Soft Soil ◽  
Dynamic Compaction ◽  
Geological Exploration ◽  
Reinforced Plastic ◽  
The Cost ◽  
Compaction Method

After the research of detailed geological exploration report, as well as the selection and optimization of foundation processing programs, dynamic compaction method with reinforced plastic drainage board is chosen to achieve good results, shorten the duration and reduce the cost.

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