COMPARATIVE ANALYSIS OF TYPE A AND TYPE B MICROPILE SYSTEMS IN SANDY SOIL
Volume Title: ICASGE2025
Paper ID : 1103-ICASGE-FULL
Authors
1Civil Engineering Department, Faculty of Engineering, Helwan University, Cairo, Egypt.
2Reinforced Concrete Structures (RCS)
315 May Institute, Egypt
Abstract
Micropiles are small-diameter drilled grouted piles. The grouting technique affects the connection between the grout and the surrounding earth. According to FHWA 2005, the most popular varieties of these techniques are Types A and B. For experimental work, these methods are the most appropriate. With an emphasis on the impact of the water-to-cement (W/C) and slenderness ratios (L/D) on performance, this study compares the bear-ing capacity behavior of Type A and Type B micropiles in sandy soil under vertical loads. A mathematical model was developed to predict pile load capacity based on de-flection, L/D ratio, and W/C ratio, providing a practical tool for optimizing pile design. This research emphasizes the importance of geometric properties and grout composition in enhancing micropile efficiency under various loading conditions. Another model was employed to verify the validity of the (Binu Sharma 2014) micropile and the load-settlement for every test is presented in this paper. Based on the present study on Type A, experimental results show a load capacity (Q) reaching 6082 N at settlement (δ) of 5.08 mm for L/D=14 and W/C=0.3. Type B demonstrates higher capacities, reaching up to 7848 N at a settlement of 3.8 mm under similar conditions.These findings indicate that Type A exhibits complex behavior influenced by slenderness and W/C ratios, while Type B shows a more direct relationship with settlement. The results provide valuable insights for optimizing micropile design and performance prediction.
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