Abstract




 
   

IJE TRANSACTIONS B: Applications Vol. 29, No. 2 (February 2016) 183-191    Article Under Final Proof

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  EFFECT OF MOISTURE CONTENT ON SHEAR STRENGTH OF OFFSHORE CLAY INTERFACE STEEL SURFACE
 
S. E. Mousavi
 
( Received: December 22, 2015 – Accepted: January 26, 2016 )
 
 

Abstract    This paper investigates the effect of moisture content on interface shear strength between offshore clay and steel plate. Although, sensitive and high plasticity offshore clay deposits are widely distributed in Malaysia and many other countries in the world, and steel is a vital construction material for many structures, research works on interaction between offshore clay and steel surface are relatively scarce. This study aims to evaluate interface shear strength of offshore clay with various steel surfaces namely, smooth, rough, and corroded. To achieve such aim, direct shear tests were conducted to assess the effect of moisture content and surface roughness on the interface shear strength. The normal stresses were ranged to be 50, 100, and 150 kPa. It was found that, the interface shear strength of offshore clay with rough steel significantly increased by almost 1.5-fold. It was further discovered that, addition of water content induced a progressive decrease in the interface shear strength. In summary, it has been observed that rough steel surface higher than the smooth and corroded steel surface enables a better interaction with offshore clay, enhancing the interface friction angle. The results developed in this research work can contribute a cost-effective design of structures in offshore clay.

 

Keywords    Offshore clay, Moisture content, Interface shear strength, Surface roughness

 

چکیده    در تحقیق حاضر تاثیر درصد رطوبت روی مقاومت برشی بسیج شده در سطح مشترک بین یک نوع خاک چسبنده و سه نوع صفحه فولادی با سطوح متفاوت مورد بررسی قرار گرفته است. گرچه این نوع خاک رس حساس که از عمق دریا بدست آمده به وفور در کشور های مختلف دنیا یافت می شود ونیز فولاد یکی از مصالح کلیدی در صنعت ساختمان محسوب می گردد تاکنون اندرکنش بین فولاد و خاک مذکور به طور کامل مورد تحقیق قرار نگرفته است. در این پژوهش مقاوت برشی بین نمونه خاک با درصد رطوبت های مختلف (30، 50 و 70 درصد ) و سه نوع فولاد با سطوح صاف، زنگ زده و زبر آزمایش گردیده است. به منظور ارزیابی تاثیر درصد رطوبت و نیز زبری سطح فولاد روی مقاومت برشی فصل مشترک خاک و فولاد آزمایشات برش مستقیم انجام یافته است. نتایج آزمایشات آزمایشگاهی نشان می دهند که مقاومت برشی فصل مشترک خاک و فولاد برای سطح زبر دارای بیشترین مقدار بوده و در مقایسه با سطوح صاف و زنگ زده حدودا" 1.5 برابر افزایش یافته است. نتایج این تحقیق می تواند در طراحی سازه های فولادی مستقر در دریا مانند اسکله ها مفید باشد. گرچه انجام آزمایشات آزمایشگاهی و صحرایی بیشتری توصیه می گردد.

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