Experimental study of the effect of cushion thickness and the pile spacing on the behavior of the non-connected pile raft foundation

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Ghanbar Dezfouli Mohammad; DEHGHANI MASOUD; Asakereh adel; KALANTARI BEHZAD

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Journal: Modares Civil Engineering journal Year:2018 | Volume:18 | Issue:6 Page(s): 107-120

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Title

Experimental study of the effect of cushion thickness and the pile spacing on the behavior of the non-connected pile raft foundation

Author(s)

Ghanbar Dezfouli Mohammad | DEHGHANI MASOUD | Asakereh adel | KALANTARI BEHZAD | Issue Writer Certificate

Keywords

non-connected pile raft foundationQ1

Laboratory modelQ2

sandQ2

cushionQ1

Abstract

Because of the existence of concentrated forces and high bending moments at the junction of pile and raft in structure with a high load using the non-connected pile raft foundation can be an appropriate option for the foundation of the mentioned structures. In this system, the piles and the raft are not connected and a cushion is used between the piles and the raft to redistribute the forces. in this state, load transmit from raft to pile by the arching mechanism that forming in cushion layer. The behavior of pile raft because of the interactions such as: pile-pile, pile-soil, pile-raft and raft-soil is very complicated. The pile used in pile raft for two purpose: 1-reduce the settlement and 2-increase the bearing capacity. In this study, a series of experimental tests were conducted on a non-connected pile raft located on a sandy soil in order to investigate the effect of parameter such as cushion height (H) and pile spacing (S) in forms of non-dimensional form (H/B & S/D) on load-settlement behavior, pile bearing ratio and axial and frictional stress in center and corner piles. For this purpose, cases H/B= 0. 17, 0. 34, 0. 5 and S/D=2, 4, 6 were investigated. The axial stress in piles measured according to strain gauges that installed in the perimeter of piles. The results show that in three state S/D=2, 4, 6 optimum state occur in H/B=0. 34. With increase H/B, the forces applied in piles is decrease and then the pile bearing ratio is decrease. The maximum pile bearing ratio occur in H/B=0. 17 and the minimum occur in H/B=0. 5. In the low level of the load major of the load protected by raft that with increase the load level, pile bearing ratio increase and stable in a specified value. Because part of the load is transmitted to piles by the soil around the piles, the maximum force applied to the piles does not occur at the tip of the piles and a negative friction is formed in the upper part of the piles. In the upper part of the piles, the displacement of the soil is more than the displacement of the piles, resulting in the formation of a negative friction and the formation of a positive friction in the bottom of the piles. With increase the H/B, the value of negative friction increases and neutral axes (a location of piles that displacement of soil and pile are equal) move down. In various pile spacing (S/D=2, 4, 6) and in three states (H/B= 0. 17, 0. 34, 0. 5) maximum bearing pressure was observed in S/D= 4. In S/D=2 maximum interaction effect (pile-pile) and minimum confinement of sand and in S/D=6 minimum interaction effect (pile-pile) existed and confinement of sand has insignificant effect because of high pile spacing. In three states H/B= 0. 17, 0. 34, 0. 5 minimum pile bearing ratio in S/D=6 and maximum pile bearing ratio in S/D=4 were observed. Maximum negative friction in S/D=6 and minimum negative friction in S/D=4 were observed. In all states in corner piles negative friction is more than center piles.

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APA: Copy

Ghanbar Dezfouli, Mohammad, DEHGHANI, MASOUD, Asakereh, adel, & KALANTARI, BEHZAD. (2018). Experimental study of the effect of cushion thickness and the pile spacing on the behavior of the non-connected pile raft foundation. MODARES CIVIL ENGINEERING JOURNAL, 18(6 ), 107-120. SID. https://sid.ir/paper/256720/en

Vancouver: Copy

Ghanbar Dezfouli Mohammad, DEHGHANI MASOUD, Asakereh adel, KALANTARI BEHZAD. Experimental study of the effect of cushion thickness and the pile spacing on the behavior of the non-connected pile raft foundation. MODARES CIVIL ENGINEERING JOURNAL[Internet]. 2018;18(6 ):107-120. Available from: https://sid.ir/paper/256720/en

IEEE: Copy

Mohammad Ghanbar Dezfouli, MASOUD DEHGHANI, adel Asakereh, and BEHZAD KALANTARI, “Experimental study of the effect of cushion thickness and the pile spacing on the behavior of the non-connected pile raft foundation,” MODARES CIVIL ENGINEERING JOURNAL, vol. 18, no. 6 , pp. 107–120, 2018, [Online]. Available: https://sid.ir/paper/256720/en

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