Contrastive Studies of the Testing Method for the Bearing Capacity and Deformation Modulus of Dynamic Consolidation Backfill Foundation

2012 ◽  
Vol 446-449 ◽  
pp. 1606-1614
Author(s):  
Yue Gui ◽  
Hui Tao ◽  
Pei Ning Zhu ◽  
Hua Hai Yang ◽  
Tong Fa Deng
Keyword(s):  
Bearing Capacity ◽  
Deformation Modulus ◽  
Reference Value ◽  
Residual Soils ◽  
In Situ Test ◽  
Power Construction ◽  
Geological Conditions ◽  
Dynamic Consolidation ◽  
Engineering Practices

The study collected a great deal of testing data, including the physical properties of soil before dynamic compaction and in-situ test and laboratory test data after dynamic consolidation, from twenty-eight engineering practices about dynamic consolidation granite residual soils(GRS) backfill foundation in power construction in Guangdong province over the past fifteen years. The backfill were classified into three types according to the fraction of soil, the corresponding foundations were classified into three types too. Base on the plate loading testing (PLT), the suitability of testing the bearing capacity and deformation modulus of dynamic Consolidation backfill foundation, by dynamic penetrating testing (DPT), standard penetrating testing (SPT) and laboratory soil testing (LST), were evaluated. The statistic relationships between SPT, DPT blow count and the bearing capacity, deformation modulus of dynamic consolidation backfill foundation were also generalized; as well as the factors influent the testing results were analyzed. And the accuracy of adopting two common region specifications to determine the bearing capacity and deformation modulus were analyzes. This article has some reference value on ground treatment detection of dynamic consolidation backfill foundation with similar engineering geological conditions.

Field Test of DX Pile Group

2011 ◽  
Vol 243-249 ◽  
pp. 2451-2455
Author(s):  
Song Tao Tang ◽  
Li Hong Chen
Keyword(s):  
Bearing Capacity ◽  
Cross Section ◽  
Pile Group ◽  
Variable Cross Section ◽  
Variable Cross ◽  
Test Results ◽  
The Mean ◽  
Engineering Practices ◽  
Pile Length

DX pile is a newly developed variable cross-section pile. Compared to conventional straight pile, it has distinct advantages on bearing capacity and settlement control. However, the bearing mechanism and characteristics of settlement, especially on group DX piles, are not clear. This paper illustrated and analyzed the bearing capacity and settlement characteristics of single DX pile and group DX piles according to the test results of in-situ model test. Special attention was paid on single and group DX pile comparison under same circumstances, at the mean while, compared the single DX pile and conventional pile with the same pile length and diameter, and with the same bearing capacity. The conclusions from the test results provided theoretical references for the design of the DX piles in engineering practices.

Study on the Effective Reinforcement Depth of Dynamic Consolidation

2011 ◽  
Vol 90-93 ◽  
pp. 1295-1298
Author(s):  
Xiu Guang Song ◽  
Kai Yao ◽  
Qing Dong Wu ◽  
Ji Shan Liu
Keyword(s):  
Field Testing ◽  
Simulation Method ◽  
Affecting Factors ◽  
In Situ Test ◽  
Main Design ◽  
Testing Method ◽  
Dynamic Consolidation ◽  
Effective Reinforcement ◽  
Formula Method

The effective reinforcement depth was the main design basis of dynamic consolidation. The concept and affecting factors of the effective reinforcement depth were analyzed in the paper. The evaluating standards and determining methods were also summarized. The effective reinforcement depth could be determined from the field test and the in-situ test index. Three kinds of methods could be used to determine the effective reinforcement depth: field testing method, numerical simulation method and formula method.

Design and Application of Rock Bolt Foundation in Mountain Cable Crane

2014 ◽  
Vol 578-579 ◽  
pp. 745-750
Author(s):  
Jin Sheng Lei ◽  
Xue Ting Cao ◽  
You Wei Zeng ◽  
Fei Liu
Keyword(s):  
Bearing Capacity ◽  
Design Theory ◽  
Failure Modes ◽  
Effective Means ◽  
Reference Value ◽  
Rock Bolt ◽  
Mountainous Area ◽  
Geological Conditions ◽  
Cable Crane ◽  
Force Calculation

Restricted by the construction environment, the cable crane is an effective means to resolve the transportation of materials and component in the mountainous area. Compared with traditional gravity anchor base, cable crane fixed on the rock bolt foundation can take advantage of the bearing capacity of bedrock, and the construction method is simple and of good economic benefit. With the effect of the construction methods, design theory of geological conditions, and other factors, however, force calculation is much complicated. By analyzing the failure modes of rock bolt foundation, anchor foundation bearing capacity factors and multi anchorage effect on anchoring force, we studied the design process of rock bolt foundation, geotechnical strength parameters and the safety coefficient of reference value. Further, a construction way is proposed to improve the basic bearing capacity of rock bolt. Combing with engineering examples, we also demonstrated the security and reliability of the design method .

Mechanical Behavior of Broken Stone Fills under Dynamic Consolidation

2012 ◽  
Vol 446-449 ◽  
pp. 1696-1702
Author(s):  
Zheng Guo Gao ◽  
Yu Long Du ◽  
Xiao Bo Huang ◽  
Xin Huang
Keyword(s):  
Numerical Simulation ◽  
Significant Relationship ◽  
Dynamic Compaction ◽  
Reinforcement Effect ◽  
In Situ Test ◽  
Response Characteristics ◽  
Dynamic Consolidation ◽  
Dynamic Response Characteristics ◽  
Better Than

This paper studies the dynamic response characteristics of broken stone fills. Numerical simulation and in-situ test of the acceleration and settlement of a high fill under dynamic consolidation are carried out. The result shows that increasing compact energy and the compact numbers can improve the reinforcement effect. There is no significant relationship between the dynamic compaction number reaching the stable settlement and compact energy. When the compact energy is the same, compaction with a heavier hammer is better than compaction with a lighter hammer.

Radiation Defects and Energy Storage in Natural Polycrystalline Rock Salt. Results of an In-Situ Test in the Permian Rock Salt of the Asse

1993 ◽  
Vol 333 ◽  
Author(s):  
H. Gies ◽  
A. García Celma ◽  
J. B. M. de Haas ◽  
L. Pederson ◽  
T. Rothfuchs
Keyword(s):  
Energy Storage ◽  
Radiation Damage ◽  
Rock Salt ◽  
Defect Formation ◽  
Damage Development ◽  
In Situ Test ◽  
Natural Rock ◽  
Metal Colloid ◽  
Geological Conditions

ABSTRACTRadiation damage development and the corresponding energy storage in pure undeformed single crystals have frequently been studied in laboratory experiments, however little is known of irradiation experiments on natural rock salt (polycrystalline, deformed and impure) under geological conditions. The relevance of these parameters to the defect formation was revealed by a joint United States/Federal Republic of Germany in-situ test in the Asse Mine. Natural rock salt was heated and irradiated using Co-60 sources.Calculations of the amount of halite expected to be decomposed by radiolysis during the experiment were performed using the 1985 version of the Jain-Lidiard model. Qualitative agreement between theory and analyses was found for all the performed analyses. Quantitative and qualitative deviations of the natural samples behaviour from that of single undeformed crystals were observed and attributed to the influence of sulfatic admixtures, ‘polycrystallinity’ and strain on radiation damage development and anneal.Special chemical methods, such as iodometric titration and uv-visible spectroscopy were applied in order to measure the hypochlorite ion, which forms in irradiated salt. Composite samples located closest to the Co-60 source averaged 0,4 micromoles neutral chlorine atoms per gram salt, a factor of two more than from other positions. Uv-vis analyses revealed more than a factor of ten greater neutral chlorine concentrations in coloured halite. Similarly, optical absorption measurements indicated a factor of ten difference in sodium metal colloid concentrations.

Experimental Study on Bearing Characteristics of the Pad and Chimney Foundation in Salt Lake Area

2012 ◽  
Vol 256-259 ◽  
pp. 97-100 ◽  
Author(s):  
Yin Man ◽  
Xian Long Lu ◽  
Wei Feng Zheng
Keyword(s):  
Bearing Capacity ◽  
Saline Soil ◽  
Salt Lake ◽  
High Water ◽  
Foundation Engineering ◽  
Lake Area ◽  
In Situ Tests ◽  
Foundation Soil ◽  
Geological Conditions

Transmission line foundation engineering inevitably encounters the special geological conditions in salt lake area, such as strong corrosion of saline soil, weakness of foundation soil and high water table of groundwater. In-situ tests on bearing characteristics of the selected pad and chimney foundation were conducted. Ultimate uplift bearing capacity and ultimate compressive bearing capacity of the pad and chimney foundation in salt lake are obtained, which can verify the rationality and reliability for its engineering popularization.

scholarly journals Rapid in situ test and determination of dam foundation weak mudstone bearing capacity

2021 ◽  
Vol 861 (4) ◽  
pp. 042089
Author(s):  
Bin Liu ◽  
DeXin Nie ◽  
HongFu Zhou ◽  
Su Zhang ◽  
Min You
Keyword(s):  
Bearing Capacity ◽  
Dam Foundation ◽  
In Situ Test

Analysis of Bored Piles' Field Test Results

2019 ◽  
Vol 828 ◽  
pp. 194-201
Author(s):  
Lidia Kondratieva ◽  
Vladimir Konyushkov ◽  
Le Van Trong ◽  
Vladimir Kirillov
Keyword(s):  
Bearing Capacity ◽  
Deformation Modulus ◽  
Field Tests ◽  
Side Surface ◽  
Geometrical Parameters ◽  
Foundation Design ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Geological Conditions ◽  
Bored Piles

The purpose of the study is to establish accuracy of determining the load-bearing capacity of bored piles according to the method specified in Regulations 24.13330.2011 "Pile foundations". Relevance of the topic is determined by the following: the load-bearing capacity of a pile is a fundamental indicator affecting all subsequent activities related to foundation design, and accuracy of analytical solutions for complex engineering and geological conditions is highly questionable. Field tests of bored piles were carried out in engineering and geological conditions of Saint Petersburg with deformation modulus from 10 to 40 MPa at a load in the range from 1,000 to 6,300 kN, at achievement of absolute settlement of 40 mm. Piles with a diameter from 0.15 to 0.88 m and a length from 10 to 47 m were made using various technologies: using casing, using slurry, using a flight auger. Following the results of field tests, diagrams of load-bearing capacity of piles according to the material, depending on geometrical parameters and manufacturing techniques, diagrams of actual and designed load-bearing capacity of piles were plotted. Approximating functions to describe the dependences were obtained. According to the analysis of the results, it is possible to conclude that the load-bearing capacity of the bored pile during field tests is 1.4–1.7 times higher than the load-bearing capacity of the pile designed according to Regulations 24.13330.2011; the average share of the load-bearing capacity along the side surface of the pile was 65% and under the pile toe — 35%.

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