scholarly journals FIELD TRIALS ON THE SOIL CEMENT MIXING TECHNOLOGY TO REINFORCE EARTH LEVEES IN THE MEKONG DELTA, VIETNAM

2018 ◽  
Vol 8 (1) ◽  
pp. 14-26
Author(s):  
Hoang-Hung Tran-Nguyen ◽  
Long Phi Le ◽  
Bao Khac Le ◽  
Hien Minh Thi Ly
Keyword(s):  
Factor Of Safety ◽  
Lateral Displacement ◽  
Mekong Delta ◽  
Field Trials ◽  
Deep Mixing ◽  
The Earth ◽  
Soil Cement ◽  
Water Wells ◽  
Sliding Stability ◽  
Cement Deep Mixing

The effectiveness of seepage cutoff and sliding stability of an earth levee reinforced by soil cement deep mixing technology (SCDM) was evaluated by field monitored data. Groundwater observation was conducted via nine ground water wells installed in the research site. Lateral displacement of the whole earth levee was measured by the 15-m inclinometer casing and a 0.5-m inclinometer probe. The research assessed effects of soilcrete reinforcement by comparing with simulations before applying widely in the Mekong Delta, Vietnam. The results indicate that the soilcrete walls can effectively prevent the seepage through the earth levee’s body and improve the factor of safety about 1.2 times.

Analysis on Consolidation and Settlement Characteristics of Composite Foundation with T-Shaped Bidirectional Soil-Cement Deep Mixing Columns

2013 ◽  
Vol 470 ◽  
pp. 942-949
Author(s):  
Pei Sheng Xi ◽  
Bo Liu
Keyword(s):  
Separation Of Variables ◽  
Soil Layer ◽  
Composite Foundation ◽  
Pile Head ◽  
Pile Spacing ◽  
Deep Mixing ◽  
Loading Mode ◽  
Soil Cement ◽  
Total Settlement ◽  
Cement Deep Mixing

Based on the solution of one-dimensional consolidation model of T-shaped bidirectional soil-cement deep mixing column composite foundation and its calculating program deduced by the separation of variables and Laplace method. This paper discussed the consolidation and settlement characteristics of composite foundation under the conditions of different loading modes, foundation reinforcement modes, diameter of enlarged pile head and pile spacing. The results indicate, the soil layer in the region of enlarged pile head hardly be influenced by above factors, the lower soil layer and soft substratum soil are influenced greatly. Loading mode has a large effect on the consolidation, when loading instantaneously, the rate of consolidation is faster than that of loading constantly. The consolidation and settlement behavior of composite foundation reinforced by T-shaped bidirectional soil-cement deep mixing column and traditional bidirectional deep mixing column is much better than the original natural foundation. When the other parameters stay the same, consolidation degree and total settlement decrease with the increase of enlarged pile head diameter. With the increase of pile spacing, consolidation rate of the composite foundation decreases significantly, but the settlement value increases rapidly on the contrary.

Numerical Simulation of Load Transfer Mechanism of T-Shaped Soil-Cement Deep Mixing Column

2014 ◽  
Vol 580-583 ◽  
pp. 118-122 ◽  
Author(s):  
Pei Sheng Xi ◽  
Xiao Tao Zhang ◽  
Bo Liu
Keyword(s):  
Numerical Simulation ◽  
Load Transfer ◽  
Transfer Mechanism ◽  
Deep Mixing ◽  
Pile Diameter ◽  
Load Transfer Mechanism ◽  
Soil Cement ◽  
Head Height ◽  
General Section ◽  
Cement Deep Mixing

T-shaped soil-cement deep mixing column load transfer mechanism is different from the general section column. Basing on the fast Lagrangian finite difference method, we study the load transfer mechanism of T-shaped soil-cement deep mixing column at different load levels, expanding head height and the ratio of upper and lower pile diameter. By the numerical simulation we obtained that the axial force plummeted value of expanding head flange increases with the load and the ratio of upper and lower pile diameter increasing, it will decreases when the height of expanding head increasing.This paper can provide a reference for the design of T-shaped soil-cement deep mixing column.

Pile Capacity in Homogeneous Unsaturated Sand Layer

2011 ◽  
Vol 110-116 ◽  
pp. 13-17
Author(s):  
Anuchit Uchaipichat ◽  
Ekachai Man Koksung
Keyword(s):  
Pile Foundation ◽  
Factor Of Safety ◽  
Matric Suction ◽  
Earth Surface ◽  
Sand Layer ◽  
Pile Capacity ◽  
Natural Soils ◽  
Unsaturated Sand ◽  
The Earth ◽  
Dry Conditions

Generally, pile foundation is typically chosen to support heavy structures. However, the developments of expressions to determine the pile capacity is usually based on fully saturated and completely dry conditions. In fact, almost 40 percent of natural soils on the earth surface are in an unsaturated state. Thus, in this paper, an expression for pile capacity in homogeneous unsaturated sand layer is developed. The simulations using developed expression are performed and discussed. Typical results show that the pile capacity and the factor of safety are affected by matric suction. However, the influence of matric suction may be ignored for a long pile.

Study on the Scope of Application of Cement Deep Mixing Pile to Consolidate Soft Soils

2013 ◽  
Vol 423-426 ◽  
pp. 1169-1172
Author(s):  
Xin Hong Guo ◽  
Guang De Wu ◽  
Xin Huan Guo
Keyword(s):  
Moisture Content ◽  
Dry Density ◽  
Soft Soils ◽  
Deep Mixing ◽  
Applicable Range ◽  
Scope Of Application ◽  
Cement Deep Mixing

According to the experiments study, the formulas of strength with the changes of moisture content, natural dry density, cement dosage are presented. Applicable range of cement mixing pile to consolidate soft soils is determined which can be used to guide the using of cement mixing pile and provide reference for design or research departments at the same time.

Field trials of the use of hydrated bentonite for decommissioning oil and gas wells

2016 ◽  
Vol 56 (2) ◽  
pp. 561 ◽  
Author(s):  
Brian Towler ◽  
Mahshid Firouzi ◽  
Amin Mortezapour ◽  
Paul Hywel-Evans
Keyword(s):  
Coal Seam ◽  
Oil And Gas ◽  
Laboratory Data ◽  
Field Trials ◽  
Gas Wells ◽  
Coal Seam Gas ◽  
Water Wells ◽  
The Us ◽  
Oil And Gas Wells ◽  
The Many

Bentonite is widely used for plugging shallow water wells in the US. In the past 15 years Chevron has been plugging oil and gas wells with bentonite in the San Joaquin Basin in California, and has successfully plugged about 10,000 wells. In several previous publications the authors’ research team has reported laboratory data to predict pressure containment using bentonite to underpin the fundamentals for plugging both oil and gas wells. The authors propose bentonite as an alternative medium for decommissioning coal seam gas wells in Queensland. Gas producing companies in Queensland are proposing to drill and produce about 40,000 coal seam gas wells in the state, and all of these will have to be plugged eventually. Water wells are shallow and are usually plugged with coarse granulated bentonite that is simply poured down the hole and hydrated. The authors propose a process for compressing bentonite into cylinders of various shapes, which promises to improve the use of bentonite for plugging deeper wells. Oil and gas wells are presently plugged and abandoned with cement. Bentonite has a number of advantages when plugging oil and gas wells. It is cheaper and easier to deploy and it is more reliable than cement. In this extended abstract the application of bentonite for plugging conventional oil and gas and coal seam gas wells will be discussed. The many field trials will be reviewed and the fundamental theory for plugging wells with bentonite will be outlined.

Study on the applicability of a retaining wall using batter piles in clay

2016 ◽  
Vol 53 (8) ◽  
pp. 1195-1212 ◽  
Author(s):  
Minsu Seo ◽  
Jong-Chul Im ◽  
Changyoung Kim ◽  
Jae-Won Yoo
Keyword(s):  
Lateral Displacement ◽  
Retaining Wall ◽  
Earth Pressure ◽  
Integrated System ◽  
Element Analysis ◽  
Test Execution ◽  
The Earth ◽  
National University ◽  
Clay Ground ◽  
Batter Piles

A retaining wall using batter piles has been developed and studied to improve existing earth-retaining structures at Pusan National University. The earth-retaining method is a temporary excavation method using an integrated system of front supports and batter piles. The batter piles connected to the front supports significantly reduce the earth pressure acting on the front supports by distributing it to batter piles to increase structural stability. In this study, the existence of batter piles, the fixity of the tips of front supports or batter piles, the spacing between batter piles, and the verticality of front supports are varied across model tests. The lateral displacement of the earth-retaining wall decreased by approximately 40% and 15% for the existence and fixity of batter piles, respectively. The applicability of the earth-retaining method using batter piles has been verified with finite element analysis and field test execution in clay ground.

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