بهبود مقاومت و پایداری سطحی خاک با استفاده از فرایند EICP

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده مهندسی عمران، دانشگاه صنعتی خواجه نصیرالدین طوسی، تهران، ایران.

2 دانشکده مهندسی عمران، دانشگاه صنعتی خواجه نصیرالدین طوسی، تهران، ایران

3 دانشکده علوم زیستی، دانشگاه صنعتی خواجه نصیرالدین طوسی، تهران، ایران

چکیده

در سال‌های اخیر فرسایس سطحی خاک، به خصوص توسط باد موجب افزایش سطح بیابان‌ها و افزایش مشکلات برای اکوسیستم شده است. مقاوم کردن سطحی خاک با استفاده از روش‌های زیستی یکی از روش‌های جدید مقابله با مسئله‌ی فرسایش در خاک می‌باشد. در این تحقیق عصاره‌ی خام اندام هوایی گیاه سویا به عنوان منبع غنی از آنزیم اوره‌آز در فرایند ترسیب کلسیم کربنات القایی (EICP) استفاده شده است. در این فرایند اوره توسط آنزیم اوره‌آز هیدولیز می گردد و سپس کربنات تولید شده با کلسیم موجود در محیط محلول EICP ترکیب می شود و کلسیم‌کربنات تولید می شود که به عنوان چسباننده ذرات خاک عمل می‌کند. عصاره‌ی گیاهی جایگزین مناسبی برای آنزیم خالص اوره‌آز یا آنزیم به دست آمده توسط باکتری‌های تولید کننده آنزیم اوره آز می باشد که تهیه آنها هزینه‌بر می‌باشد. سه نوع خاک برای عمل سیمانتاسیون زیستی با استفاده از فرایند EICP مورد پاشش محلول EICP قرار گرفته و آزمایش سنجش مقاوت خاک با استفاده از نفوذ سنج جیبی برروی خاک انجام شده است. ضخامت پوسته‌های تشکیل شده در اثر پاشش محلول اندازه‌گیری شده است. نتایج نشان‌گر آن است که روش استفاده شده موجب افزایش مناسب مقاومت سطح خاک می‌گردد و روشی مناسب برای جلوگیری از فرسایش خاک می‌باشد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Improving Soil Surface Resistance and Stability Using EICP Process

نویسندگان [English]

  • Sepideh Aghaalizadeh 1
  • Farzin Kalantary 2
  • Faezeh Ghanati 3
1 Department of Civil Engineering, K.N. Toosi University of Technology, Valiasr St., Mirdamad Cr., Tehran, Iran
2 Department of Civil Engineering, K.N. Toosi University of Technology, Valiasr St., Mirdamad Cr., Tehran, Iran
3 Department of Plant Biology, Faculty of Biological Science, Tarbiat Modares University (TMU), Tehran, Iran
چکیده [English]

In recent years, soil surface erosion, especially by wind, has increased the area of deserts and increased problems for the ecosystem. Using biological methods to strengthen the soil's surface is a new way to prevent soil erosion. In this study, crude extract of soybean shoots has been used as a rich source of urease enzyme in the process of enzyme induced calcium carbonate precipitation (EICP). In this process, urea is hydrolyzed by urease enzyme and then the produced carbonate is combined with calcium in the EICP solution to produce calcium carbonate which acts as a binder for soil particles. The plant extract is a suitable substitute for pure urease enzyme or enzyme obtained by bacteria, which is costly to prepare. Three types of soils have been sprayed with EICP solution for biocementation using the EICP process and soil strength measurement test has been performed on the soil using a penetrometer. The thickness of the crust formed by the spraying of the solution has been measured. The results show that the method used increases the soil surface resistance and is a suitable method to prevent soil erosion.

کلیدواژه‌ها [English]

  • EICP
  • Erosion
  • Retrofitting
  • Penetrometer
  • Sand

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نشریه مهندسی عمران امیرکبیر
دوره 57، شماره 6
شهریور 1404
صفحه 1093-1110

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