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.

scholarly journals The reinforcement effects of deep soft soil foundation with high degree of saturation under dynamic compaction

2018 ◽  
Vol 10 (6) ◽  
pp. 168781401878263 ◽  
Author(s):  
Jihong Wei ◽  
Yan Men ◽  
Feng Zhu ◽  
Huilin Le ◽  
Haotian Fan
Keyword(s):  
Soft Soil ◽  
Dynamic Compaction ◽  
Degree Of Saturation ◽  
Reinforcement Effect ◽  
Construction Time ◽  
Soil Foundation ◽  
Soft Soil Foundation ◽  
High Degree ◽  
Deep Soft Soil ◽  
Compaction Method

The dynamic compaction method is effective to reinforce soft soil foundation with a low degree of saturation. However, deep soft soil foundation with high degree of saturation has some different characteristics. It has been widely considered that dynamic compaction method is unsuitable to improve the characters of deep soft soil foundation with high degree of saturation. In this article, we will show that the dynamic compaction method with vacuum well-point dewatering is effective to deep soft soil foundation with high degree of saturation reinforcement. In situ and laboratorial experiments are used to assess the reinforcement effect of the deep soft soil foundation with high degree of saturation. Our results show that the dynamic compaction method causes long dissipation time of pore water pressure, and the dynamic compaction method with vacuum well-point dewatering makes construction time of a project 25% shorter. The effective depth of deep soft soil foundation with high degree of saturation reinforcement using the two experimental methods can reach to 8.0 m. In comparison with the total settlement and layered settlement of the dynamic compaction method with vacuum well-point dewatering, the dynamic compaction method settlement is relatively smaller. For soils with depth of 4 m, the reinforcement effect of dynamic compaction method with vacuum well-point dewatering is obviously superior to dynamic compaction method. Based on these results, we suggest construction procedures for different reinforcement depth of soils and construction time.

Experimental Study on Dynamic Compaction-Plastics Drain Board Method in Backfill Subgrade Reinforcement

2011 ◽  
Vol 474-476 ◽  
pp. 2032-2036
Author(s):  
Yong Ma ◽  
Mao Tian Luan ◽  
Zhong Chang Wang
Keyword(s):  
Experimental Study ◽  
Pore Water ◽  
Pore Water Pressure ◽  
Water Pressure ◽  
Soft Soil ◽  
Time Effect ◽  
Dynamic Compaction ◽  
Excess Pore Water Pressure ◽  
Compaction Method ◽  
Excess Pore

Plastics drain board method is one of the most effective ways of reducing excess pore water pressure during the process of dynamic compaction in soft soil subgrade reinforcement. Based on field test in neritic backfilled area of Jinzhou Port 207B berth, the pore water pressure, groundwater level, subgrade bearing capacity and time effect of deformation have been measured and analyzed. The application of dynamic compaction-PDB method makes a mighty advance of the dynamic compaction method, which provides a new way for soft soil treatment in coastal areas.

Fabrication of Electroplated CBN End-Mill for High-Efficiency Face Milling of Carbon Fiber Reinforced Plastic

2015 ◽  
Author(s):  
Tatsuya Furuki ◽  
Toshiki Hirogaki ◽  
Eiichi Aoyama ◽  
Keiji Ogawa ◽  
Kiyofumi Inaba
Keyword(s):  
Carbon Fiber ◽  
Carbon Fiber Reinforced Plastic ◽  
Fiber Reinforced ◽  
End Mill ◽  
Fiber Reinforced Plastic ◽  
Coated Tools ◽  
Reinforced Plastic ◽  
End Mills ◽  
Carbon Fiber Reinforced ◽  
The Cost

Carbon fiber reinforced plastic (CFRP) was developed in the 1960s. Since then, it has been used in various fields. Accordingly, the number of studies related to machining of CFRP has been increasing (e.g. cutting, laser processing, or abrasive water jet machining). However, these studies have been focusing on the trimming of surplus portions or drilling. In addition, the degradation of mechanical properties due to the heat induced during machining has not been sufficiently considered. Furthermore, another issue is the cost involved, such as tool and equipment costs. This makes several of these proposed methods tremendously expensive. Therefore, in this study, electroplated end-mills with electrodeposited cBN or diamond grains of different grit sizes (the mesh size are #600, #1000, #1500 and #2000) are fabricated. As a result, the cost of the electroplated tool will decrease by 2/3 compared to general diamond-coated tools. Moreover, the flat cutting of CFRP is often carried out with these fabricated tools and with general diamond-coated tools. In cases where the fabricated tools are used, the machined CFRP products are burr-free or nap-free. Additionally, the induced CFRP temperature during cutting decreases compared to the case of diamond-coated tools. From these results, the optimum grit size was determined to be #1000. On the other hand, end-mills with deposited cBN or diamond grains, fixed on the tip of the fabricated tool, occasionally dropped out after a few paths. Therefore, efforts are presented to improve the tool tip shape and minimize its grain dropout rate. Based on such improved characteristics, the electrodeposited end-mill is expected to be able to machine CFRP more effectively.

Application on the Artificial Filling Foundation Treatment for Housing Construction Project in Mountain Highway

2014 ◽  
Vol 529 ◽  
pp. 755-758
Author(s):  
A Ling Zhang ◽  
Dan Ni Qi
Keyword(s):  
Construction Project ◽  
Dynamic Compaction ◽  
Housing Construction ◽  
Treatment Methods ◽  
Replacement Method ◽  
Foundation Treatment ◽  
Highway Facilities ◽  
National Investment ◽  
Compaction Method

Along with large national investment in infrastructure construction, the mileage of the highway, which is one of the infrastructures, has increased year by year. There are many kinds of artificial filling foundation treatment methods for housing construction project in mountain highway facilities. This paper, combined with the engineering example, focuses on the dynamic compaction method and the replacement method.

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..

Model Test Study on Vibration Transferring of Dynamic Compaction and the Measures of Reducing Vibration

2011 ◽  
Vol 368-373 ◽  
pp. 3121-3126 ◽  
Author(s):  
Qing Juan Meng ◽  
Wei Hua Ma ◽  
Jing Sheng Qiao
Keyword(s):  
Model Test ◽  
Vibration Isolation ◽  
Influence Factors ◽  
Dynamic Compaction ◽  
Vibration Acceleration ◽  
Horizontal Vibration ◽  
Filling Materials ◽  
Surrounding Environment ◽  
Test Study ◽  
Compaction Method

Dynamic compaction method was widely used in various engineering foundation reinforcement, the research of influence to surrounding environment from dynamic compaction and the measures of reducing vibration was not complete. In this paper, the decay laws of dynamic compaction vibration acceleration in horizontal direction was got through the model test, the attenuation formula of horizontal vibration acceleration was fitted, which provides theory basis for determining the influence scope of dynamic compaction; And the depth and filling materials two influence factors of vibration isolation ditch were researched by model tests, which provide important basises for the application of vibration isolation ditch.

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.

scholarly journals DYNAMICS OF OIL PRODUCTION FROM HARD RESERVES IN RUSSIA

2021 ◽  
Vol 2 (4) ◽  
pp. 294-301
Author(s):  
Mikhail V. Mishenin
Keyword(s):  
Geological Exploration ◽  
Resource Base ◽  
Oil Reserves ◽  
Current State ◽  
Federal Districts ◽  
The Russian Federation ◽  
The Cost ◽  
Development Prospects ◽  
Hydrocarbon Reserves

The article presents a comprehensive study of the current state and development prospects of hard-to-recover reserves. The role of hard-to-recover reserves in the structure of the crude oil base by categories of reserves and federal districts, as well as on the shelf of the Russian Federation is considered. The analysis of industry-wide trends in the reproduction of the mineral resource base with differentiation by deposits and companies-subsoil users is carried out. The issues of the current state of the volume of financing for geological exploration and the cost of preparing hydrocarbon reserves have been investigated. The dynamics of the distribution of recoverable oil reserves, volumes and efficiency of geological exploration at fields discovered in recent years have been analyzed. The characteristics and dynamics of production of certain categories of hard-to-recover oil by region have been investigated.

scholarly journals Ecological aspect in combined sewer overflows chamber design

2013 ◽  
Vol 8 (3-4) ◽  
pp. 409-416
Author(s):  
J. Pollert
Keyword(s):  
Ecological Engineering ◽  
Combined Sewer Overflows ◽  
Reinforced Plastic ◽  
Combined Sewer ◽  
New Type ◽  
Receiving Waters ◽  
Sewer Overflows ◽  
The Cost ◽  
Floating Objects ◽  
Receiving Water

In 2005 one of major Czech manufacturers of glass reinforced plastic pipes asked the Department of Sanitary and Ecological Engineering to develop a new type of combined sewer overflows (CSO) chamber that could become a part of their manufacturing programme. The main requirements were economy of production, easy and fast installation on the field and increased protection of receiving waters. A simple object consisting of a pipe placed above another one was designed. The object begins with a stilling chamber formed by a conical expansion of the inlet pipe. It is separated from the overflow object itself by a downflow baffle designed to trap floating objects. The CSO chamber is equipped by a flow regulation device (e.g. vortex valve or throttle pipe) at the end. Excess water flows through a slit in the top of the bottom pipe into the upper pipe and from there to the receiving water. More than 15 prototypes were already installed in the Czech and Slovak Republics and more than 20 are planned to be built in Europe. We hope this type of CSO CHAMBER will help to decrease the cost of construction of new sewers and reconstruction of old ones. Its higher efficiency of separation of suspended particles might also contribute to the improvement of the quality of receiving water bodies according to Water Framework Directive 2000/60/EC.

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