Ultimate Lateral Load Capacity of Piles in Soils Contaminated with Industrial Wastewater

Mahdi O Karkush,Mustafa M Jasim,Mahmoud S Abdul Kareem

doi:10.28991/cej-0309111

Mahdi O Karkush, Mustafa M Jasim + Show 1 more

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https://doi.org/10.28991/cej-0309111

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Abstract

The present study devoted to determine the ultimate lateral carrying capacity of piles foundation in contaminated clayey soils and subjected to lateral cyclical loading. Two methods have been used to calculate the lateral carrying capacity of piles foundation; the first one is two-line slopes intersection method (TLSI) and the second method is a modified model of soil degradation. The model proposed by Heerama and then developed by Smith has been modified to take into consideration the effects of heavy loads and soil contamination. The ultimate lateral carrying capacity of single pile and piles group (2×2) driven into samples of contaminated clayey soils have been calculated by using the two methods. Clayey soil samples are contaminated with four percentages of industrial wastewater (10, 20, 40 and 100) % of the distilled water used in the soaking process, the soaking procedure of soil samples have been proceeded for 30 days. Also, two ratios of eccentricity to embedded length (e/L = 0.25 and 0.5) have been examined. The results obtained from two analytical methods are well agreed with those obtained experimentally. The ultimate lateral carrying capacity, Pu (analytical) /Pu (experimentally) ranged from (75-8) % and (77-80) % of single pile with e/L = 0.25 and 0.5 respectively. In the piles group the ratio ranged (67-80) % and (71-79) % for e/L = 0.25 and 0.5 respectively.

Highlights

The level of polluted soil increases essentially inside the zones of industrial activities because of the rapid extension and development of industrial activities, such as electrical power plants, oil fields and oil refineries
The results of ultimate lateral carrying capacity of single pile and piles group subjected to lateral cyclic loading in contaminated soils directed to the following conclusions:
The ultimate lateral carrying capacity of single pile obtained from two-line slopes intersection method (TLSI) ranged 75-80% and 76-80% of the ultimate lateral carrying capacity obtained experimentally for eccentricity to length ratio (e/L)= 0.25 and 0.5 respectively

Summary

Introduction

The level of polluted soil increases essentially inside the zones of industrial activities because of the rapid extension and development of industrial activities, such as electrical power plants, oil fields and oil refineries. A method for determining the deflections at ground surface of flexible and rigid piles were presented by Broms [1]. A semi empirical, nonlinear, p-y (soil lateral resistance-pile deflection) approach developed by Reese et al [2], in which degradation factors obtained empirically were used to predict the cyclical p-y relationships based upon degraded static p-y curves. The p-y approach improved by Long and Vanneste [4] to consider the effect of the number of loading cycles. Only 50 cycles, or less, of lateral loads were executed in most of the tests considered. Yang and Jeremic [5] generated p-y curves describing the behavior of single pile in elastic-plastic soils by using finite element method

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Conclusion