New Approaches in Civil Engineering

New Approaches in Civil Engineering

Numerical Analysis Comparison of Improvement Methods Increasing Density and Drainage in the Behavior of Pile under Lateral and Vertical Loads

Document Type : Original Article

Authors
Majid Taromi 1
Maziar Hosseini 2
1 Young Researchers and Elite Club, South Tehran Branch, Islamic Azad University, Tehran, Iran
2 Department of Civil Engineering, Islamic Azad University – South Tehran Branch, Faculty of Engineering Tehran, Iran.
10.30469/jnace.2025.543543.1130
Abstract
The use of deep foundations in the civil engineering structures has been developed as an appropriate support for controlling lateral displacements or settlement, as well as a structural approach to the improvement of liquefiable soils. However, damage to the structures based on deep foundations in past earthquakes, the need for complementary methods to enhance the structural performance of the inevitable. In this paper, the performance and requirements of pile productivity in two different soil improvement methods include (1) methods of increasing compaction of the soil and (2) drainage, by 3D finite element method in the liquefiable sandy soils investigated. To evaluate the seismic response of pushover analysis by applying a combination of vertical and lateral load is used to pile head. Parameters pile length (Lp), pile diameter (Dp), pile head boundary conditions (fixed or free), and the thickness and method of improvement methods have been evaluated. The results indicated that overall improvement by increasing soil density method performed better in reducing the displacement of the pile in liquefaction sands. On the other hand, by increasing the diameter of the pile and the pile fixity conditions in both methods is reduced, the displacement values. While, with increasing in the pile diameter, values of bending moment increases both ways. Also, the effective length of pile to control the movement of soil liquefaction is 5 m and longer lengths not optimal. On the other hand, the optimum thickness of the layer rehabilitated by increasing density is two meters to Lp/2.
Keywords
Liquefaction
Pushover analysis
Concrete pile
Soil improvement
Lateral load
Displacement

Subjects

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New Approaches in Civil Engineering
Volume 9, Issue 1
Spring 2025
Pages 29-43