Back Calculation of Excessive Deformation on Deep Excavation

Ma’ruf, Mokhammad Farid; Darjanto, Helmy

doi:10.1016/j.proeng.2017.01.362

Cited by 2 publications

(3 citation statements)

References 5 publications

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“…Node to node anchor is preferred over beam because, as shown in Fig. 5, beam is actually a representation of beam wall and requires beam parameter adjustment to represent piles [14]. Modeling bamboo piles as beam structures in 2D plane strain may overestimate pile strength support.…”

Section: D Model Developmentmentioning

confidence: 99%

“…The soil was simply modeled using the Mohr Coulomb model.The mattress is represented as a beam structure, and the bamboo pile is a node to node anchor. Node to node anchor is preferred over beam because, as shown in Fig.5, beam is actually a representation of beam wall and requires beam parameter adjustment to represent piles[14]. Modeling bamboo piles as beam structures in 2D plane strain may overestimate pile strength support.Cross section area and the length of bamboo pile are represented into spring constant k to determine pile's modulus of elasticity EA as follows:…”

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confidence: 99%

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Load Sharing Mechanism of Bamboo Pile Mattress for Reinforced Embankment

Ma’ruf¹

2023

GEOMATE

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In Indonesia, bamboo pile mattress is commonly utilized for reinforced embankments over deep soft soil, especially for shallow ground water table or even over the ground surface as the water functions as timeless preservation for the bamboo. However hardly any articles have been published for design references. This work intends to evaluate bamboo pile mattress for embankment reinforcement numerically by means of Plaxis 2D. A parametric analysis was conducted to assess the effect of both piles spacing s and length L on embankment settlement, stability, and pile load ratio αp. A ratio s/L is introduced to evaluate the combination of s and L effects. Furthermore, normalized settlement S/S∞ and normalized factor of safety SF/SF∞ are proposed to facilitate the assessment, in which S∞ and SF∞ are ones at s/L = ∞ (bamboo mattress with no pile condition). The results show that S/S∞ increases with increasing s/L. Inversely, SF/SF∞ and αp decrease with decreasing s/L. When s and L are increased independently, S/S∞ and SF/SF∞ curves initially follow different paths. When s/L > 0.1 the curves merge into a line. Meanwhile, αp curves blend into a line and separate with a different slope when s/L > 0.1. s/L = 0.1 becomes an onset point to show that L provides more significant effects than s for S/S∞ and SF/SF∞ at s/L < 0.1. However, L produces less influence on αp than s at s/L > 0.1. Furthermore, the findings may provide insight and direction for reinforced embankment design using bamboo pile mattress.

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Section: D Model Developmentmentioning

confidence: 99%

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confidence: 99%

Load Sharing Mechanism of Bamboo Pile Mattress for Reinforced Embankment

Ma’ruf¹

2023

GEOMATE

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“…Research on the deformation of the supporting structure is the basis of ground subsidence research. Moreover, extensive research has been conducted on the displacement of the supporting structure of deep excavations under different conditions, and useful conclusions have been drawn [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Surface Settlement Damage Model of Pile‐Anchor Supporting Structure in Deep Excavation

Zhang

Jiang

et al. 2020

Advances in Civil Engineering

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In damage mechanics, the deep excavation of soil is a process of damage development, and soil failure can be considered a process of continuously transforming undisturbed soil to damaged soil. Therefore, this study considered the occurrence of soil damage during the pit excavation, established a soil damage model, damage evolution equation, and soil damage constitutive relationship, and then deduced a calculate model of the pile displacement under the consideration of soil damage. Based on the principle of the stratum loss method, the surface settlement around a deep excavated pit was assumed as a skewed distribution curve, and the surface settlement of the pile-anchor supporting pit was solved. Based on this established method, finite element analysis software was used to calculate the surface subsidence for a field case, and the numerical results were compared with monitoring data in the field. The results revealed that, to a certain extent, soil damage affected the distribution of surface settlement in excavated pits. With the development of soil damage, the mechanical properties of soil gradually decreased, which led to increased surface settlement and changes in the direction of the excavation pit. Because soil damage is an important factor causing surface settlement, it is meaningful to consider soil damage when calculating the surface settlement in the deep excavation of pits.

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Back Calculation of Excessive Deformation on Deep Excavation

Cited by 2 publications

References 5 publications

Load Sharing Mechanism of Bamboo Pile Mattress for Reinforced Embankment

Load Sharing Mechanism of Bamboo Pile Mattress for Reinforced Embankment

Surface Settlement Damage Model of Pile‐Anchor Supporting Structure in Deep Excavation

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