scholarly journals Evaluation of Discharging Surplus Soils for Relative Stirred Deep Mixing Methods by MPS-CAE Analysis

2021 ◽  
Vol 14 (1) ◽  
pp. 58
Author(s):  
Koki Nakao ◽  
Shinya Inazumi ◽  
Toshiaki Takaue ◽  
Shigeaki Tanaka ◽  
Takayuki Shinoi
Keyword(s):  
Simulation Analysis ◽  
Ground Improvement ◽  
Normal Type ◽  
Deep Mixing ◽  
Improvement Measures ◽  
Improvement Method ◽  
Mixing Method ◽  
Cae Analysis ◽  
Great Damage

Most of the ground in Japan is soft, leading to great damage in the event of liquefaction. Various ground-improvement measures are being taken to suppress such damage. However, it is difficult to carry out ground-improvement work while checking the internal conditions of the ground during the construction. Therefore, a visible and measurable evaluation of the performance of the ground-improvement work was conducted in this study. The authors performed a simulation analysis of the relative stirred deep mixing method (RS-DMM), a kind of ground-improvement method, using a computer-aided engineering (CAE) analysis based on particle-based methods (PBMs). In the RS-DMM, the “displacement reduction type (DRT)” suppresses displacement during construction. Both the DRT and the normal type (NT) were simulated, and a visible and measurable evaluation was performed on the internal conditions during each construction, the quality of the improved body, and the displacement reduction performance. As an example of these results, it was possible to visually evaluate the discharge of surplus soil by the spiral rod attached to the stirring wing of the DRT. In addition, the authors succeeded in quantitatively showing that more surplus soil was discharged when the stirring wing of the DRT was used than when the stirring wing of the NT was used.

scholarly journals Visual evaluation of relative deep mixing method type of ground-improvement method

2021 ◽  
pp. 100233
Author(s):  
Koki Nakao ◽  
Shinya Inazumi ◽  
Toshiaki Takaue ◽  
Shigeaki Tanaka ◽  
Takayuki Shinoi
Keyword(s):  
Ground Improvement ◽  
Visual Evaluation ◽  
Deep Mixing ◽  
Improvement Method ◽  
Mixing Method

Dynamical Analysis on Sugarcane Cutter Rigidity Enhancement

2011 ◽  
Vol 199-200 ◽  
pp. 1387-1390
Author(s):  
Xiao Lai ◽  
Shang Ping Li ◽  
Fang Lan Ma ◽  
Jing Hui Zhou ◽  
Zheng Zhong Zhang
Keyword(s):  
Mathematical Model ◽  
Simulation Analysis ◽  
Physical Experiment ◽  
Cutting Performance ◽  
Dynamical Analysis ◽  
Effect Factors ◽  
Dynamical Simulation ◽  
Actual Effect ◽  
Great Damage

Improving the cutting performance, especially the cutting quality of sugarcane harvesters is the most magnificent problem for popularizing the application of the havesters. Much research has been done on most effect factors but rare on the influence of rigidity enhancement of sugarcane cutter. Indeed, the rigidity of sugarcane cutter has notable influence on the quality of sugarcane cutting，as it effects its vibration and the vibration in turn brings great damage to the cutting quality. This paper analyzes how the rigidity of sugarcane cutter effects its working vibration by building up its mathematical model, then further investigates it by making a dynamical simulation analysis to compare two cutter structures with different rigidity based on ANSYS and ADAMS, and validate the actual effect of enhancing the cutter rigidity through a physical experiment. The result shows enhancing the rigidity of the cutter could lead to notable improvement of sugarcane cutting quality.

scholarly journals Stabilizing Property of Expansive Soil with Different Sand Layers

2019 ◽  
Vol 8 (12S) ◽  
pp. 1261-1266
Keyword(s):  
Ground Improvement ◽  
Expansive Soil ◽  
Load Test ◽  
Layered Soils ◽  
Soil Layers ◽  
Plate Load Test ◽  
Improvement Method ◽  
Load Tests ◽  
Problematic Soil

Sweeping Soil improves by better root development, water development, and furthermore by blending bits of the dirt profile, to give progressively uniform surface. As a ground improvement method to improve the quality of dangerous soils and this examination is done to comprehend the settlement conduct of layered soils. The dirt which is gathered was seen as risky in nature, which is all the more expanding in nature. The examples of soil are gathered from in and around Chennai. The sand utilized in this investigation is taken from close by site and is utilized to improve the hazardous soil by shaping a layer of required thickness. The primer tests are directed on the dirt examples to decide their properties according to IS models. After the fundamental test, the plate load tests are performed on the dirt with square plate (10 mm x 10mm) so as to know the bearing limit of soil. The heap tests are performed on sand and mud layers with fluctuating thickness of 5cm, 10 cm and 15 cm of sand over mud soil. From the plate load test the heap settlement conduct of soil layers are examined. It very well may be reason that on the off chance that various layers of sands are given over Problematic soil, at that point It gets enough Load bearing obstruction which can be further gets actualized during Highways developments. The outcomes says that of 15 cm layer of sand shows most extreme burden bearing limit and indicated better burden – settlement diagrams also.

scholarly journals Recent Development and Future Perspectives of Quality Control and Assurance for the Deep Mixing Method

2021 ◽  
Vol 11 (19) ◽  
pp. 9155
Author(s):  
Masaki Kitazume
Keyword(s):  
Quality Control ◽  
Soil Stabilization ◽  
Mechanical Mixing ◽  
Deep Mixing ◽  
Recent Developments ◽  
Stabilized Soil ◽  
Mixing Method ◽  
Stabilization Technique

The deep mixing method (DMM), an in situ soil stabilization technique, was developed in Japan and Nordic countries in the 1970s and has gained increased popularity in many countries. The quality of stabilized soil depends upon many factors, including its type and condition, the type and amount of binder, and the production process. Quality control and quality assurance (QC/QA) practices focus on stabilized soil, and comprises laboratory mix tests, field trial tests, monitoring and controlling construction parameters, and verification. QC/QA is one of the major concerns for clients and engineers who have less experience with the relevant technologies. In this manuscript, the importance of QC/QA-related activities along the workflow of deep mixing projects is emphasized based on the Japanese experience/results with mechanical mixing technology by vertical shaft mixing tools with horizontal rotating circular mixing blade. The current and recent developments of QC/QA are also presented.

scholarly journals A SYSTEM TO EVALUATE THE QUALITY OF SOIL-CEMENT COLUMN BY DEEP MIXING METHOD

2001 ◽  
Vol 66 (550) ◽  
pp. 79-86
Author(s):  
Masahito TAMURA ◽  
Yoshio INOUE ◽  
Ryuji KOBORI ◽  
Kazuhiro WATANABE ◽  
Mamoru FUJII ◽  
...  
Keyword(s):  
Deep Mixing ◽  
Soil Cement ◽  
Mixing Method

scholarly journals Deep mixing method for the construction of earth and water retaining walls

2017 ◽  
Vol 2 ◽  
pp. 1-9 ◽  
Author(s):  
Nicolas Denies ◽  
Noël Huybrechts
Keyword(s):  
Large Scale ◽  
Ground Improvement ◽  
Retaining Walls ◽  
Bending Tests ◽  
Deep Mixing ◽  
Soil Cement ◽  
Mixing Method ◽  
Cement Mixture ◽  
Soil Mix ◽  
Steel Section

In the deep mixing method, the ground is mechanically mixed in place while a binder, often based on cement, is injected. After hardening of the soil-cement mixture, called soil mix material, soil mix elements are formed in the ground. Originally known as a ground improvement technique, the deep mixing is more and more applied for the construction of earth-water retaining structures within the framework of excavation works. After a short introduction to the execution aspects of the method, the authors discuss the hydro-mechanical properties of the soil mix material mainly based on the results of the BBRI Soil Mix project (2009-2013). A design approach dedicated to the soil mix retaining walls and developed in collaboration with the SBRCURnet is then presented. In this methodology, which is in line with the structural Eurocodes, design rules are adapted to the functions of the soil mix wall (earth-water retaining, bearing and cut-off functions) including the temporary or permanent character of the application. Based on the result of large-scale bending tests, the interaction between the soil mix material and the steel reinforcement is considered in the calculations allowing a reduction of the steel section between 10 and 40 %.

INVESTIGATION ON THE EFFECT OF COUNTERMEASURES FOR SUBSIDENCE AT THE APPROACHING AREAS OF ABUTMENTS

2019 ◽  
Vol 6 (1) ◽  
Author(s):  
Yukihide Kajita ◽  
Kazuki Onoda ◽  
Taiji Matsuda ◽  
Kunihiko Uno ◽  
Takeshi Kitahara
Keyword(s):  
Seismic Analysis ◽  
Ground Improvement ◽  
Bending Moment ◽  
Soil Improvement ◽  
Ground Subsidence ◽  
The Third ◽  
Deep Mixing ◽  
Emergency Vehicles ◽  
Mixing Method

The purpose of this study is to confirm the effect of soil improvement methods on preventing ground subsidence at the back of abutments. Earthquake seismic analysis is performed for three models. One is a model with no ground improvement. Next is a model with deep mixing method. The third is the model with lightweight banking method. As a result, from the perspective of the passage possibility of the emergency vehicles, both the deep mixing method and lightweight banking method are effective in preventing ground subsidence at the approaching area of abutments. However, in the case of the deep mixing method, it is found that the maximum bending moment of the pile under the liquefaction layer increases because a lump of improved rigid soil that falls down toward the piles.

Test on Cement Deep Mixing Soil Strength

2013 ◽  
Vol 401-403 ◽  
pp. 738-742
Author(s):  
Jin Fang Hou ◽  
Ming Ying Li
Keyword(s):  
Ground Improvement ◽  
Soft Clay ◽  
Treatment Method ◽  
Soil Strength ◽  
Design Strength ◽  
Deep Mixing ◽  
Ground Treatment ◽  
Mixing Method ◽  
Clay Ground ◽  
Cement Deep Mixing

Cement deep mixing method is a normal ground treatment method. However, it is less applied on the soft clay ground improvement. The test was carried out to the strength of cement mixing soft clay. The soft clay was mixed with cement to become cement mixing soil. The strength of cement mixing soil was analyzed at different maintenance ages. As the results, the strength was lower than the anticipation value. After mixing additive, the strength of cement mixing soil increased, but it still wasnt reached the design strength demand. So, the cement deep mixing method is careful to be as a ground treatment method for the project with thick soft clay ground and high design strength.

Temperature control in a chemical reactor through variable area of the heat transfer surface. Simulation analysis

1982 ◽  
Vol 47 (2) ◽  
pp. 430-445
Author(s):  
Josef Horák ◽  
Zina Valášková
Keyword(s):  
Heat Exchange ◽  
Simulation Analysis ◽  
Batch Reactor ◽  
Chemical Reactor ◽  
Rate Of Change ◽  
Action Variable ◽  
Heat Exchange Surface ◽  
Relay With Hysteresis ◽  
Exchange Surface

An algorithm has been developed and on a mathematical model analyzed to stabilize the reaction temperature of a batch reactor. The reaction has been a zero-order one and the reactor has been operated in a instable operating point. The action variable is the heat exchange surface whose area is increased if the temperature is above, or decreased if the temperature is below the set point. The following two-point regulators have been studied: An ideal relay, a relay with hysteresis and an asymmetric PD relay. The effect has been discussed of the parameters of the regulators on the quality of regulation. Stability analysis has been made of the stationary switching cycles and the domains of applicability have been determined for individual regulators with respect to the rate of change of the area of heat exchange surface.

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