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.

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..

Application of a Modified Vacuum Preloading Method on a Dredged Fill Soft Foundation

2012 ◽  
Vol 170-173 ◽  
pp. 3130-3134 ◽  
Author(s):  
Yun Liang Cui ◽  
Ming Jun Gao ◽  
Zhi Hao Liu
Keyword(s):  
Bearing Capacity ◽  
Reinforcement Effect ◽  
Large Area ◽  
Vacuum Preloading ◽  
Soft Foundation ◽  
Short Period ◽  
Dredging Sludge ◽  
Made In China ◽  
Preloading Method ◽  
Sand Cushion

A lot of large area lands were made in China coastal areas by dredging sludge from the sea. The dredged fill ground had a very low bearing capacity which should be increased as soon as possible to meet the requirements of constructions. However, conventional vacuum preloading could not be used for this purpose because the sand cushion could not be laid on the sludge ground due to the very low bearing capacity. To solve this problem, a modified vacuum preloading method without sand cushion was proposed. This method has been successfully tested and applied in the reclamation project in Wenzhou. Based on this project, the technological process and the key technology were introduced and the reinforcement effect was analyzed. Project results showed the modified vacuum preloading method could achieve a good reinforcement effect on large area dredged fill ground in a short period. It is worth to promote the application of this method in coastal reclamation projects.

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.

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 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.

Highway Subgrade Dynamic Response Model Test Study on Foundation-Broaden Dynamic Compaction Consolidation

2013 ◽  
Vol 353-356 ◽  
pp. 842-846 ◽  
Author(s):  
Xiang Hong Pan ◽  
Zhan Yong Yao ◽  
Kai Zhang ◽  
Zhuang Jin
Keyword(s):  
Model Test ◽  
Dynamic Pressure ◽  
Dynamic Compaction ◽  
Small Radius ◽  
Reinforcement Effect ◽  
Test Study ◽  
Key Points ◽  
Propagation Law ◽  
Vibration Impact ◽  
Road Widening

While widen the highway foundation, due to it is still unclear that the law of dynamic compaction vibration impact on the original subgrade and foundation structure , which restricts the use of dynamic compaction technology in the highway foundation-broaden project. In this paper, by using the dynamic compaction indoor model test, simulated the dynamic compaction road widening foundation works, monitored the vibration acceleration of the pavement and subgrade surface in the process of dynamic compaction vibration, analyzed the dynamic compaction vibration propagation law of the roadside foundation in the subgrade structure. At the same time, we made the vibration amplitude of the key points and the rammer subsoil dynamic pressure value as double assessment indicators. Besides, we analyzed the dynamic compaction vibration response of subgrade under different parameters, evaluated foundation reinforcement effect. With research, under the same tamping energy and in a certain range of rammer diameter and weight, we had better choose small radius rammer and the compaction process of heavier rammers dropping from lower point, which can reduce the foundation dynamic vibration of the old subgrade and ensure foundation reinforcement effect.

Computer simulation study about the dependence of amorphous silicon photonic waveguides efficiency on the material quality

2020 ◽  
Vol 90 (3) ◽  
pp. 30502
Author(s):  
Alessandro Fantoni ◽  
João Costa ◽  
Paulo Lourenço ◽  
Manuela Vieira
Keyword(s):  
Amorphous Silicon ◽  
High Throughput Screening ◽  
Simulation Analysis ◽  
Low Cost ◽  
Deposition Process ◽  
Large Area ◽  
Sidewall Roughness ◽  
Sensing Applications ◽  
Fabrication Defects ◽  
The Impact

Amorphous silicon PECVD photonic integrated devices are promising candidates for low cost sensing applications. This manuscript reports a simulation analysis about the impact on the overall efficiency caused by the lithography imperfections in the deposition process. The tolerance to the fabrication defects of a photonic sensor based on surface plasmonic resonance is analysed. The simulations are performed with FDTD and BPM algorithms. The device is a plasmonic interferometer composed by an a-Si:H waveguide covered by a thin gold layer. The sensing analysis is performed by equally splitting the input light into two arms, allowing the sensor to be calibrated by its reference arm. Two different 1 × 2 power splitter configurations are presented: a directional coupler and a multimode interference splitter. The waveguide sidewall roughness is considered as the major negative effect caused by deposition imperfections. The simulation results show that plasmonic effects can be excited in the interferometric waveguide structure, allowing a sensing device with enough sensitivity to support the functioning of a bio sensor for high throughput screening. In addition, the good tolerance to the waveguide wall roughness, points out the PECVD deposition technique as reliable method for the overall sensor system to be produced in a low-cost system. The large area deposition of photonics structures, allowed by the PECVD method, can be explored to design a multiplexed system for analysis of multiple biomarkers to further increase the tolerance to fabrication defects.

A novel low cost texturization method for large area commercial mono-crystalline silicon solar cells

2006 ◽  
Vol 90 (20) ◽  
pp. 3557-3567 ◽  
Author(s):  
U. Gangopadhyay ◽  
K.H. Kim ◽  
S.K. Dhungel ◽  
U. Manna ◽  
P.K. Basu ◽  
...  
Keyword(s):  
Solar Cells ◽  
Crystalline Silicon ◽  
Low Cost ◽  
Silicon Solar Cells ◽  
Large Area ◽  
Crystalline Silicon Solar Cells
Sign in / Sign up

Export Citation Format

Share Document