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DX pile 14

bearing capacity 10

settlement 9

Sutong Bridge 2

bored pile 2

finite-element analysis 2

group-pile foundation 2

numerical analysis 2

pile foundation 2

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static load test 2

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Discussion on formula for anti pull bearing capacity of DX pile

Yuan Xiyu,He Dexin,Chen Lihong

Strategic Study of CAE 2012, Volume 14, Issue 1, Pages 69-73

Abstract:

When the DX-pile is under uplift load, the pile-soil interaction consistsof pile shaft resistance and uplift resistance provided by the bells which effectively raises the uplift-pileThe friction resistance along pile shaft friction has been study well and has lots of results, but theproblem of calculating the resistance of bell is still under studied which is the key to DX-pile upliftThis paper calculates the bearing capacity of DX-pile and compares it with the measured value on the

Keywords： DX-pile uplift capacity resistance of load carrying plate calculation methods

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Case study of DX single pile settlement

Tang Songtao,Yuan Xiyu,Chen Lihong

Strategic Study of CAE 2012, Volume 14, Issue 1, Pages 41-45

Abstract:

DX pile which is typical varied cross-section pile has a different loadtransfer mechanism compared to straight pile.The bearing capacity of the pile is increased, while the settlement is significantly reduced at the sameThis paper compares the settlement characteristics of DX pile and straight pile on the basis of lotsof projects to verify the DX pile settlement formula and the reliability of correction factor.

Keywords： DX pile straight pile settlement correction coefficient

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Study of in situ test to DX pile and post grouting bored pile

Liu Chungang,Chai Xiaobing,Ouyang Yi,He Dexin

Strategic Study of CAE 2012, Volume 14, Issue 1, Pages 80-85

Abstract:

The in-situ vertical resisting compression static test of DX pile ismade and it is compared with post-grouting bored pile.The results indicate that DX pile and post-grouting bored pile can enhance capacity and control settlementeffectively;effect of four test piles is not quite different, but the DX pile is of smaller diameter; DX pile can reduce engineering materials to lower project cost and speed up the construction progress

Keywords： DX pile static load test bearing capacity settlement

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New pile foundation technology of 21 Century: DX pile

Wang Mengshu,He Dexin,Tang Songtao

Strategic Study of CAE 2012, Volume 14, Issue 1, Pages 4-12

Abstract:

As a kind of old construction form, pile foundation still plays a tremendousThe fast developing and innovation of technology promote new types of pile constantly emerging, whichDX pile is one of those piles and has been widely used.characters, advantages, research progress both at home and abroad, and engineering applications of DXpile.

Keywords： DX pile bearing mechanism bearing capacity settlement

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Study on load bearing characteristic of cast in situ DX group pile with numerical analysis

Zhang Qinglin,Chen Lihong

Strategic Study of CAE 2012, Volume 14, Issue 1, Pages 51-59

Abstract:

This paper analyzes 4 types of group-pile which contains 4 piles withThe main conclusions are: group pile effect of DX pile increases sharply when pile spacing decreases；the bearing capacity of 3D spacing group-pile is 1.32 times larger than that of 1.5D spacing group-pile；effect coefficient of group-pile increases from 0.59 to 0.78 when spacing increases from 1.5D to 3D；when the spacing of pile increases.

Keywords： DX pile group-pile settlement numerical analysis

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Study on settlement of DX single pile

Ouyang Yi,Chen Lihong,Zhang Dehua

Strategic Study of CAE 2012, Volume 14, Issue 1, Pages 74-79

Abstract:

As the existence of load-carrying plate DX pile changes the load transferIn this paper, on the basis of field trials, the distribution characteristics of load of DX piles andequal diameter piles are analyzed, and thus according to Geddes solution the soil pile superimposedThe results show that in the same load conditions, the settlement of DX pile is 0.55 to 0.80 times ascompared with equal diameter pile.

Keywords： DX pile load-carrying plate settlement superimposed stress

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Discussion on design method of DX pile

Chen Fei,Chen Lihong

Strategic Study of CAE 2012, Volume 14, Issue 1, Pages 60-64

Abstract: ="text-align: justify;">Different industry has different calculation method for bearing capacity of pileDX pile is a new kind of varied cross-section pile.Applying calculation methods in the specification of these three industries on DX pile will induce significantBased on 18 case of DX pile, the difference of calculation methods were discussed and a new design methodfor DX pile of bridge was proposed.

Keywords： DX pile bearing capacity specification design methods

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Introduction of equipment and engineering methods of DX pile technology

He Dexin

Strategic Study of CAE 2012, Volume 14, Issue 1, Pages 13-18

Abstract:

This paper introduced the developing process of DX pile technology inFrom the invention of the DX extruding-expanding rig, the drilling-extruding-cleaning rig, to the rotaryextruding-expanding rig, DX pile technology achieved great progress and development.

Keywords： DX pile extruding expanding rotary extruding expanding cutting rolling

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The application of DX rotary and squeezed pile on railway bridge engineering

Zhang Dehua,Wang Mengshu

Strategic Study of CAE 2009, Volume 11, Issue 7, Pages 92-96

Abstract:

Squeezed pile with plates (being DX pile) is a new type pile that haspile.DX pile is a sort of change-section pile and is priority to shaft resistance between friction pile andDX squeezed pile cannot only be applied in clay, silt, sand, weathering rock mass and residual depositsThe diameter of DX squeezed pile can be 400~2 000 mm,and the length of it can be more than 60 m.

Keywords： DX pile DX rotary and squeezed pile bearing capacity

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Model test study on surrounding soil stress distribution of DX pile

Tang Songtao,Chen Lihong,Yuan Xiyu

Strategic Study of CAE 2012, Volume 14, Issue 1, Pages 105-112

Abstract: The test results show that the capacity and settlement characteristics of DX pile are much superior toFor the single-bell DX pile, the location of the bell has barely effect on the capacity.However, when the bell locates on the lower part of pile shaft, the stress of soil around the pile tipFor two-bell DX pile, the stresses around the two bells are similar, and the range of soil stress inducedFor the DX pile with three bells, the soil stress around the bells spread increasingly, while the amplitude

Keywords： DX pile earth pressure cell stress measurement

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Construction characteristics and effects of DX pile

Tang Songtao,Chen Lihong,Peng Wen

Strategic Study of CAE 2012, Volume 14, Issue 1, Pages 37-40

Abstract:

DX pile which is a new-type of variable cross-section pile has the characteristicsWhen constructing the DX pile, only one extra procedure of extruding and expanding the bell cavitiesDX pile has not only high bearing capacity, but also effectively controlled settlement of pile deformationThe static load test of a highway bridge foundation shows that the bearing capacity of DX pile is moreascending displacements of anchor piles are less than 1 mm, which means even in the uplift performance, DX

Keywords： DX pile bearing capacity settlement uplift

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Numerical analysis for castedinplace DX pile groups

Wan Fei,Zhang Dehua

Strategic Study of CAE 2012, Volume 14, Issue 1, Pages 46-50

Abstract:

DX pile group is simulated by numerical analysis software FLAC3D to studyDX pile group with 6 piles are done.The result indicates that the pile of DX pile group has the same bearing mechanism with the DX singleThe ultimate bearing capacity of DX pile group with 6 piles is as 1.27 times as the straight pile groupWith DX pile group, we can not only effectively control the settlement, but also reduce the number of

Keywords： pile foundation ultimate bearing mechanism numerical analysis DX pile group

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Model test study on load bearing mechanism of DX pile

Li Zhong,Zhang Hang,Gu Yuan,Nan Yong,Chen Lihong

Strategic Study of CAE 2012, Volume 14, Issue 1, Pages 86-89

Abstract:

DX pile is a new kind of variable cross-section pile invented recentThrough small scale model test to study the theory of the DX pile.It bases on the comparative tests with the straight pile and DX parallel experiment.The results show that the DX pile is superior to straight pile both on bearing capacity and settlement

Keywords： DX pile model test strain gage settlement

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Numerical analysis on uplift bearing characteristic of cast in situ DX pile

Chen Lihong,Zhang Qinglin,Yuan Xiyu

Strategic Study of CAE 2012, Volume 14, Issue 1, Pages 31-36

Abstract:

This paper analyzes DX single pile with 2 bearing plates on its resistanceThe parameters for analysis are drawn from lab test and verified by large scale loading test of DX pilesThe Q-s curve and axial force of DX pile are obtained,and the conclusions based on the analysis are drawn.Theuplift bearing capacity of DX single pile is about more than twice larger than that of the normal singlepile and its bearing plates work out from the upper to the lower order, while when the bearing capacity

Keywords： DX pile uplift bearing capacity numerical analysis

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Study on property comparison of DX pile casted in place with vario us quantities of bearing bells

Zhang Dehua,Qi Wanpeng,He Dexin

Strategic Study of CAE 2012, Volume 14, Issue 1, Pages 26-30

Abstract: style="text-align: justify;">Based on numerical simulation, bearing capacity and settlement control for DXThe property differences of conventional straight piles, DX piles with 2 bells and DX piles with 3 bellsUnder the same load, DX piles with 3 bells have smaller settlement than that of DX piles with 2 bellsAs to bearing capacity, DX piles with 2 bells are 1.5 times greater than that of the straight piles,while DX piles with 3 bells are 1.2 times greater than that of DX piles with 2 bells.

Keywords： DX pile quantity of bearing bells bearing capacity settlement