Grouted gravel column-supported highway embankment over soft clay: case study

2015 ◽  
Vol 52 (11) ◽  
pp. 1725-1733 ◽  
Author(s):  
Hanlong Liu ◽  
Gangqiang Kong ◽  
Jian Chu ◽  
Xuanming Ding
Keyword(s):  
Stress Ratio ◽  
Static Load ◽  
Soft Clay ◽  
Construction Method ◽  
Soft Ground ◽  
Soil Stress ◽  
Load Tests ◽  
Column Construction Method ◽  
Highway Embankment

In this paper, a simplified column construction method — the so-called grouted gravel column — and its application to construction of embankments over soft ground are introduced. The construction method, quality assurance (QA), and quality control (QC) of the grouted gravel columns are described. A case study on the application of this method to a highway embankment in China is also presented. The case study shows that about 50% of surface settlement and 60% of the differential settlement between the column head and soil occurred during the construction of the embankment. The column to soil stress ratio was 8.0 for columns with caps and 4.2 for columns without caps. Static load tests were also conducted to assess the bearing capacity of the columns.

Research on Pile-Soil Stress Ratio of DJM Pile Composite Foundation

2011 ◽  
Vol 52-54 ◽  
pp. 533-540
Author(s):  
Qing Zhi Yan ◽  
Yan Hua Wang
Keyword(s):  
Stress Ratio ◽  
Static Load ◽  
Yellow River ◽  
Yellow River Delta ◽  
Composite Foundation ◽  
Important Indicator ◽  
The Yellow River Delta ◽  
Soil Stress ◽  
Load Tests ◽  
Field Static

Pile-soil stress ratio is defined as the average stress ratio of the head of pile to the soil around of piles, which is a very important indicator to reflect the level of the together-work of pile and the soil, also a major parameter of calculation of capacity of composite foundation and settlement. How to choose pile-soil stress ratio is still a problem unsolved. Bearing performance of the DJM pile composite foundation is studied by way of field static load tests and pile-soil stress ratio tests. This paper is to analyze the bearing performance of the DJM pile composite foundation in the Yellow River Delta region with the plane strain finite element method and gain the load-sharing ability of soil and regulations of pile-soil stress ratio with the changes of effecting factors.

scholarly journals Application of the ‘CPT 2012’ model of AFNOR standard for column design in Poland – Jazowa case study

2019 ◽  
Vol 262 ◽  
pp. 04001
Author(s):  
Lech Bałachowski ◽  
Jakub Konkol ◽  
Kamila Międlarz
Keyword(s):  
Bearing Capacity ◽  
Static Load ◽  
Eurocode 7 ◽  
Pile Design ◽  
Load Tests ◽  
Column Design ◽  
French Standard

This paper presents the ‘CPT 2012’ model incorporated into the AFNOR NF P94-262:2012-07, French standard for pile design fully compatible with Eurocode 7, to the wider Polish audience. The bearing capacity of three reference columns for Vistula Marshlands have been calculated according to ‘CPT 2012’ model and AFNOR recommendations. Then, the design resistances have been compared with ultimate column bearing capacity measured during static load tests conducted on reference columns. The results of comparison are discussed and the discrepancies between measured and calculated bearing capacities are shortly commented.

Research on Static Load Tests of Damaged Bridge Strengthened with Pre-Stressed HFRP

2014 ◽  
Vol 1079-1080 ◽  
pp. 258-265
Author(s):  
Chen Ning Cai ◽  
Shan He ◽  
Li Na Liu ◽  
Shi Kun Ou
Keyword(s):  
Static Load ◽  
Flexural Rigidity ◽  
Fiber Reinforced Polymer ◽  
Test Results ◽  
Structural Members ◽  
Fiber Reinforced ◽  
Hybrid Fiber ◽  
Reinforced Polymer ◽  
Glass Fiber Reinforced ◽  
Load Tests

Thispaper presents an experimental study to strengthen an existing bridge usingpre-stressed carbon fiber reinforced polymer (CFRP) and glass fiber reinforced polymer(GFRP) materials. The method using pre-stressed hybrid fiber reinforced polymer(HFRP) to strengthened structural members is an emerging pre-stressed strengtheningtechnology. In this study, experimental data selected from result of staticloading test conducted to hollow slabs with CFRP/GFRP has been compared with specimenswithout strengthening. Test results showed that the strengthening methoddeveloped in this study could effectively reduce the stress in hollow slab,improving the flexural rigidity and inhibiting the concrete from fracture.

scholarly journals Pressure Orientation-Dependent Recovery of 3D-Printed PLA Objects with Varying Infill Degree

Polymers ◽  
2021 ◽  
Vol 13 (8) ◽  
pp. 1275 ◽  
Author(s):  
Guido Ehrmann ◽  
Andrea Ehrmann
Keyword(s):  
Shape Memory ◽  
Fused Deposition Modeling ◽  
Static Load ◽  
Shape Memory Polymer ◽  
Applied Pressure ◽  
Poly Lactic Acid ◽  
Fused Deposition ◽  
Deposition Modeling ◽  
Load Tests ◽  
3D Printed

Poly(lactic acid) is not only one of the most often used materials for 3D printing via fused deposition modeling (FDM), but also a shape-memory polymer. This means that objects printed from PLA can, to a certain extent, be deformed and regenerate their original shape automatically when they are heated to a moderate temperature of about 60–100 °C. It is important to note that pure PLA cannot restore broken bonds, so that it is necessary to find structures which can take up large forces by deformation without full breaks. Here we report on the continuation of previous tests on 3D-printed cubes with different infill patterns and degrees, now investigating the influence of the orientation of the applied pressure on the recovery properties. We find that for the applied gyroid pattern, indentation on the front parallel to the layers gives the worst recovery due to nearly full layer separation, while indentation on the front perpendicular to the layers or diagonal gives significantly better results. Pressing from the top, either diagonal or parallel to an edge, interestingly leads to a different residual strain than pressing from front, with indentation on top always firstly leading to an expansion towards the indenter after the first few quasi-static load tests. To quantitatively evaluate these results, new measures are suggested which could be adopted by other groups working on shape-memory polymers.

Investigation of Grouted Coupler Connection Details for Accelerated Bridge Construction

2021 ◽  
pp. 036119812199939
Author(s):  
Brent Phares ◽  
Yoon-Si Lee ◽  
Travis K. Hosteng ◽  
Jim Nelson
Keyword(s):  
Crack Width ◽  
High Performance ◽  
Static Load ◽  
High Performance Concrete ◽  
Precast Concrete ◽  
Chloride Penetration ◽  
Load Testing ◽  
Test And Evaluation ◽  
Load Tests ◽  
Precast Elements

This paper presents a laboratory investigation on the performance of grouted rebar couplers with the connection details similar to those utilized on the precast concrete elements of the Keg Creek Bridge on US 6 in Iowa. The testing program consisted of a series of static load tests, a fatigue test, and evaluation of the chloride penetration resistance of laboratory specimens. The goal of this testing was to evaluate the ability of the grouted rebar couplers to develop flexural capacity at the joint between the precast elements as well as the durability of the connection. For structural load testing, seven full-scale specimens, each with #14 epoxy-coated rebars spliced by epoxy-coated grouted couplers, were fabricated and tested in three different loading cases: four-point bending, axial tension plus bending, and a cyclic test of the system in bending. The static load testing demonstrated that the applied axial load had a minimal effect on the formation of cracks and overall performance of the connection. When ultra-high performance concrete was used as a bedding grout, the initiation of crack was slightly delayed but no considerable improvement was observed in the magnitude of the crack width during loading or the crack closure on unloading. The results of the seventh specimen, tested in fatigue to 1 million cycles, showed little global displacement and crack width throughout the test, neither of which expanded measurably. No evidence of moisture or chloride penetration was detected at the grouted joint during the 6-month monitoring.

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