Behavior of a Large Diameter Bored Pile in Drained and Undrained Conditions: Comparative Analysis

Abstract

<jats:p>Despite the difficulties in obtaining the ultimate capacity of the large diameter bored piles (LDBP) using the in situ loading test, this method is the most recommended by several codes and design standards. However, several settlement-based approaches, alongside the conventional capacity-based design approach for LDBP, are proposed in the event of the impossibility of performing a pile-loading test during the design phase. With that in mind, natural clays usually involve some degree of over consolidation; there is considerable debate among the various approaches on how to represent the behavior of the overconsolidated (OC)stiff clay and its design parameters, whether drained or undrained, in the pile-load test problems. In this paper, field measurements of axial loaded to failure LDBP load test installed in OC stiff clay (Alzey Bridge Case Study, Germany) have been used to assess the quality of two numerical models established to simulate the pile behavior in both drained and undrained conditions. After calibration, the load transfer mechanism of the LDBP in both drained and undrained conditions has been explored. Results of the numerical analyses showed the main differences between the soil pile interaction in both drained and undrained conditions. Also, field measurements have been used to assess the ultimate pile capacity estimated using different methods.</jats:p>

A Parametric Numerical Study for Diagnosing the Failure of Large Diameter Bored Piles Using Supervised Machine Learning Approach

“…A numerical study has been carried out to simulate the response of the LDBP of the Alzey bridge case history [39]. Figure 2a shows the numerical model established to simulate the drained condition of overconsolidated (OC) stiff clay soil.…”

“…The micro-fissures associated with the OC stiff clay are the main reason behind using the drained condition. These micro-fissures usually provide avenues for local drainage; soil along fissures has softened (increased water content) and is softer than intact material (more comprehensive discussion for using the drained condition with OC stiff clay is provided in [39]). Three constitutive soil models have been utilized to simulate the drained condition of the overconsolidated (OC) stiff clay soil.…”

“…Moreover, the large induced pile settlement at the failure state could be determined. The procedures that followed to calibrate the numerical models are available in [39]. parison between field measurements and the numerical results (after [39]).…”

A Novel Application of the Hydrophobic Polyurethane Foam: Expansive Soil Stabilization

“…In contrast, the bonds between montmorillonite layers are weak and easy to separate in the presence of water, thus causing the soil to expand due to the increase in water intrusion inside the soil mass, as shown in Figure 2 . Existing montmorillonite in the soil creates most of the expansive soil problems [ 18 , 19 ]. The increase of montmorillonite content in the expansive clays increases both the swelling potential and pressures [ 16 ].…”

Compressive Capacity of Vortex‐Compression Nodular Piles

“…Nodular pile has been preferred option duo to its convenient construction and superior performance. In the near future, it may replace the traditional bored pile [3][4][5] and play a leading role in pile foundation engineering.…”