scholarly journals Analysis of Action Mechanism for Rigid Flexible Pile Composite Foundation

2017 ◽  
Keyword(s):  
Composite Foundation ◽  
Action Mechanism ◽  
Flexible Pile

Application Research on Composite Foundation of Rammed Soil-Cement Piles Applied in the Da-Guang Expressway from Gu'an to Shenzhou

2013 ◽  
Vol 740 ◽  
pp. 655-658
Author(s):  
Huan Sheng Mu ◽  
Ling Gao
Keyword(s):  
Soft Soil ◽  
Composite Foundation ◽  
Application Research ◽  
Action Mechanism ◽  
Foundation Design ◽  
Soil Cement ◽  
Soil Foundation ◽  
Soft Soil Foundation ◽  
Cement Soil ◽  
Capacity Characteristic

Through the practice of tamped cement soil pile in treatment of soft soil foundation in Guan to Shenzhou section of Daqing-Guangzhou Expressway, the author expounds the action mechanism of rammed soil cement pile, composite foundation design points and calculation method of bearing capacity characteristic value.

Numerical Analysis for Bearing Performance of Flexible Piles Composite Foundation Influenced by Modulus’ Changes

2011 ◽  
Vol 261-263 ◽  
pp. 1694-1698 ◽  
Author(s):  
Feng Yi Tan ◽  
Xin Zhi Wang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Numerical Analysis ◽  
Frictional Resistance ◽  
Composite Foundation ◽  
Single Pile ◽  
The Finite Element Method ◽  
Modulus Ratio ◽  
The Common ◽  
Flexible Pile

The bearing performance of composite foundation improved by flexible piles was influenced by changes of cushion’s modulus, the modulus ratio between soil on bottom of pile and soil surrounded pile, which was analyzed by the finite element method. Results showed that: 1.For single pile, by increasing of cushion’s modulus, the bearing performance nearby the top of flexible pile increased apparently, and the common tendency of settlement of pile and soil surrounded piles was affected negatively. For multi-piles, the increasing of cushion’s modulus resulted in the increasing of bearing performance and the common tendency of settlement of piles and soil surrounded piles was affected positively. 2.The change of modulus ratio between soil surrounded piles and soil on bottom of piles resulted positively in the change of frictional resistance and end-bearing performance nearby the bottom of single pile and reduced the settlement of composite foundation. But the multi-pile borne absolutely all loading due to the increasing of modulus ratio, and both of piles and soil surrounded piles had the same tendency of settlement.

Effect of Flexible Pile on Rigid Flexible Pile Composite Foundation with Geogrid Reinforced Cushion

2014 ◽  
Vol 1065-1069 ◽  
pp. 119-122
Author(s):  
Kai Fu Liu ◽  
Yi Hu ◽  
Yi Jun Zhu ◽  
Zhi Yan Zou ◽  
Jin Ping Mao
Keyword(s):  
Load Distribution ◽  
Composite Foundation ◽  
Soil Arching ◽  
Reinforced Embankments ◽  
Flexible Pile

Compared with pile-supported reinforced embankments, rigid-flexible pile composite foundation with geogrid reinforced cushion (RFPCFGRC) has its advantage of its economics. Piles play an important role in rigid flexible pile composite foundation with geogrid reinforced cushion. The bearing mechanics of RFPCFGRC is more complicated than that of pile-supported reinforced embankments because of addition of flexible piles. This paper discussed the diffence and the bearing mechanics of the two types of composidte foundation. The results show that addition of flexible piles has changed bearing mechanics of composite foundation and changes the load distribution among piles and soil. Soil arching degree of RFPCFGRC is larger than that of pile-supported reinforced embankments.

scholarly journals Nonlinear Stress Analysis of Flexible Pile Composite Foundation by Energy Method

2018 ◽  
Vol 2018 ◽  
pp. 1-9
Author(s):  
Youping Wu ◽  
Liangming Fu ◽  
Wenping Wu ◽  
Yuanyuan Cao ◽  
Xuanyang Zhou
Keyword(s):  
Potential Energy ◽  
Energy Method ◽  
Load Transfer ◽  
Relative Displacement ◽  
Composite Foundation ◽  
Laboratory Model ◽  
Energy Principle ◽  
Nonlinear Stress ◽  
Modified Cam Clay ◽  
Flexible Pile

To calculate the stress of cement-soil pile (flexible pile) in composite foundation accurately and overcome the defective preposition that the pile and the soil are elastic, the nonlinear analysis and calculation of pile-soil stress by adopting the energy method are performed. First, on the basis of the universally adopted load transfer method, it is assumed that the friction and the relative displacement of the pile shaft conform with the elastic-plastic relationship. Then, the modified Cam-clay model is introduced to calculate the compressive amount of soil around the pile. Further, the stress and strain characteristics curve of the flexible pile is used to calculate the compression of the pile, deducing the energy equation of the pile and soil around the pile, establishing the total potential energy expression of the flexible pile composite foundation, and the load sharing value and the corresponding stress value of the pile-soil are obtained based on the minimum potential energy principle. Finally, this method is verified by indoor laboratory model test and the reported case. The results show that the calculated solutions are in agreement with the measurements; therefore, the calculation method is reasonable.

Numerical Simulations and Application of Radar Monitoring on the Quality of Flexible Pile in Composite Foundation

2012 ◽  
Vol 517 ◽  
pp. 771-775
Author(s):  
Meng Zhang ◽  
Hai Dong Wang ◽  
Jie Luo ◽  
Ji Ping Deng ◽  
Chun Fang Liao ◽  
...  
Keyword(s):  
Numerical Simulations ◽  
High Precision ◽  
Composite Foundation ◽  
Gravel Pile ◽  
Flexible Pile ◽  
Highway Project ◽  
Radar Monitoring

Because it is difficult to monitor the quality of gravel pile (the length, the diameter) in composite foundation, the method of radar is put forward. Numerical simulations of radar monitoring on flexural pile are processed. The results show that the method of radar monitoring can be used to check the quality of gravel piles (length, diameter) accurately. Then this technology is applied in some highway project. By comparing with the results of another company, the characteristics including high precision and speed are found. So the technology can be far and wide used.

Tribological Performance and Action Mechanism of Cadmium Dialkyldithiophosphate

2005 ◽  
Vol 48 (2) ◽  
pp. 171-175 ◽  
Author(s):  
Hu Jianqiang ◽  
Wei Xianyong ◽  
Yao Junbing ◽  
Xie Feng ◽  
Zhu Huanqin ◽  
...  
Keyword(s):  
Tribological Performance ◽  
Action Mechanism

The Action Mechanism of the Purified Platelet Aggregation Principle of Trimeresurus mucrosquamatus Venom

1979 ◽  
Vol 41 (03) ◽  
pp. 475-490 ◽  
Author(s):  
Chaoho Ouyang ◽  
Che-Ming Teng
Keyword(s):  
Platelet Aggregation ◽  
Adenine Nucleotides ◽  
Muscle Relaxants ◽  
Prostaglandin Synthesis ◽  
Action Mechanism ◽  
Crude Venom ◽  
Platelet Factor ◽  
Induce Platelet Aggregation ◽  
Minimal Concentration ◽  
Aggregation Principle

SummaryThe minimal concentration of the platelet aggregation principle (Platelet Aggregoserpen- tin, PAS) necessary to induce platelet aggregation was 10 ng/ml, about one-hundredth of that of the crude venom. PAS induced the release of platelet factors 3 and 4 from platelets, but the released platelet factor 3 was easily inactivated by the anti-phospholipid effect of PAS. Pretreatment of platelets with neuraminidase potentiated PAS-induced platelet aggregation. PAS-induced platelet aggregation was independent on released ADP; it could occur in the ADP-removing systems, such as apyrase or a combination of phosphoenolpyruvate and pyruvate kinase. However, PAS-induced platelet aggregation could be inhibited by adenine nucleotides and adenosine.PAS-induced platelet aggregation was inhibited by some anti-inflammatory agents, antimalarial drugs, local anesthetics, antihistamine and smooth muscle relaxants. After deaggregation of PAS-treated platelets, thrombin and sodium arachidonate could further induce platelet aggregation, but ADP and second dose of PAS could not. It is concluded that PAS-induced platelet aggregation is due to prostaglandin synthesis. Recent literatures on the mechanism of platelet aggregation were surveyed and the actions of PAS were discussed.

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