Influence of Crushed Stone Pile Arrangement in Loose Soils on the Operation of a Single Pile

It is difficult and important to accurately calculate single pile ultimate bearing capacity during pile foundation design. Typical computational methods on single pile ultimate bearing capacity are contrastively analyzed in this paper. Contact element method on single pile ultimate bearing capacity is relatively accurate and economical, but it isn’t used in practical projects until now because its computational process is complicated. 343 different single pile ultimate bearing capacities are calculated with the contact element method in order to study a simple computational formula based on the contact element method. All data calculated are analyzed with a linear recursive multi-analysis program which is programmed with Fortran90. A simple computational formula on the contact element method is presented based on the analysis results. The simple computational formula, the experiential formula in the code, the contact element method and the static load experiment method are respectively used to calculate single pile ultimate bearing capacity in two practical projects in order to test the simple computational formula. The results show that the simple computational formula is relatively accurate. Some advice is presented based on the analysis results.

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Theoretical Analysis and Numerical Simulation of Load-Settlement Relationship of Single Pile

Recent Advancement in Soil Behavior, in Situ Test Methods, Pile Foundations, and Tunneling ◽

10.1061/41044(351)20 ◽

2009 ◽

Author(s):

Chun-shun Zhang ◽

Yong-he Wang ◽

Hong-bin Xiao ◽

Zhen-hui Fan

Keyword(s):

Numerical Simulation ◽

Theoretical Analysis ◽

Single Pile ◽

Relationship Of

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The Feasibility of Using Micro Silica Sand Powder as Partial Replacement of Cement in Production of Roller Compacted Concrete

Materials Science Forum ◽

10.4028/www.scientific.net/msf.1021.21 ◽

2021 ◽

Vol 1021 ◽

pp. 21-34

Author(s):

Zahraa Alaa M.A. Ali Khan ◽

Zena K. Abbas

Keyword(s):

Portland Cement ◽

Minimum Cost ◽

The Other ◽

Silica Sand ◽

Engineering Properties ◽

Crushed Stone ◽

Partial Replacement ◽

Roller Compacted Concrete ◽

Water Curing ◽

Micro Silica

Roller compacted concrete (RCC) is a special type of concrete with zero or even negative slump consistency. In this work, it had aimed to produce an RCC mix suitable for roads paving with minimum cost and better engineering properties so, different RCC mixes had prepared i.e. (M1, M2, M3, and M4) using specified percentages of micro natural silica sand powder (SSP) as partial replacement of (0%, 5%, 10%, and 20%) by weight of sulfate resistant Portland cement. Additionally, M-sand, crushed stone, filler, and water had been used. The results had obtained after 28 days of water curing. The control mix (M1) had satisfied the required f ‘c with accepted results for the other tests. M2 mix with SSP of 5% had achieved the highest results. The f ’c for sawed cubes of (10*10*10) cm had increased by 2.26% and 3.16% when tested in directions (ꓕ and //) to the direction of loading respectively. R results for sawed prisms of (38*10*10) cm had increased by 8.78% and 8.43% when tested on top and bottom faces respectively. The density had increased by 1.04% while the absorption and volume of permeable voids had decreased by 8.11% and 7.83% respectively. The UPV results had also increased by 2.44% and 0.81% for cubes and prisms respectively when compared to the control mix. M3 mix with SSP of 10% had also achieved satisfactory results when compared to the control mix.

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USE OF ACRYLIC COPOLYMER ADDITIVE SOIL STABILIZATION PLUS FOR PREPARATION OF MIXTURES MADE BY COLD RESYCLING TECHNOLOGY AND CRUSHED STONE-SAND MIXTURES IN PAVEMENT FOUNDATION LAYERS

Dorogi i mosti ◽

10.36100/dorogimosti2021.24.048 ◽

2021 ◽

Vol 2021 (24) ◽

pp. 48-59

Author(s):

Anatolii Mudrychenko ◽

◽

Ivan Balashov ◽

Sergey Illyasch ◽

◽

...

Keyword(s):

Bearing Capacity ◽

Soil Stabilization ◽

Crushed Stone ◽

Technological Parameters ◽

Acrylic Copolymer ◽

Sand Mixture ◽

Recycling Technology ◽

Complex Binder ◽

Cold Recycling ◽

Pavement Foundation

ntroduction. Rehabilitation of public roads network requires a comprehensive recovery with strengthening of the bearing capacity of the pavement foundation. Rehabilitation of the foundation bearing capacity performed by arranging layers of road material made by cold recycling technology (hereinafter — CRRM) in accordance with [4] or by arranging a layer of crushed stone — sand mixture reinforced with cement or complex binder (hereinafter — CSSM 20) according to [13]. Purpose. The purpose of the work is to study the feasibility of using acrylic additives for the preparation of mixtures made by cold recycling technology and crushed stone-sand mixtures treated with cement in the layers of pavement foundation. Materials and methods. Experimental comparative tests of CRRM and CSSM 20 with different content of complex binder were performed. Results. Feasibility of acrylic additives use has been established (hereinafter — the additive) for the preparation of CRRM and CSSM 20 in the pavement foundation layers. Recommendations on technological parameters of preparation, transportation, laying and compaction of mentioned mixtures are given. Conclusions. Performed researches have shown that according to physical and mechanical indicators CRRM and CSSM20 meet the requirements of the current normative documents of Ukraine. The advantages of use are noted.

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