توسعه شاخص حفرپذیری توده سنگ درزه دار بر اساس شاخص شکست سنگ در حفاری با TBM
چکیده
پیش بینی حفرپذیری توده سنگ درزهدار در حفاری با ماشینهای حفار تمام مقطع تونل یکی از مسائل مهم در ارزیابی فنی و اقتصادی یک پروژه تونل سازی میباشد. با توجه به تأثیر پارامترهای مختلف در حفرپذیری توده سنگ، تا کنون مدلهای مختلفی برای پیشبینی این موضوع ارائه گردیده است. هدف این تحقیق ارائه مدلی جدید بر اساس توسعه شاخص شکست سنگ برای توده سنگ درزهدار به منظور پیشبینی حفرپذیری آن میباشد. برای این هدف در ابتدا بانک اطلاعاتی از پارامترهای ژئومکانیکی ، مشخصات هندسی درزهها (فاصله داری و زاویه) و عملیاتی ماشین حفار دو پروژه تونل انتقال آب کوئینز در آمریکا و تونل بلند زاگرس (قطعه 2) در ایران تشکیل گردیده است. سپس فاکتور خردایش کل (ارائه شده توسط برولند در سال 1979) محاسبه و با استفاده از نرم افرار SPSS و روش های رگرسیون غیرخطی شاخص شکست بدست آماده در آزمایشگاه برای توده سنگ درزهدار توسعه داده شده است. در ادامه نیز شاخص حفرپذیری بر اساس شاخص شکست توده سنگ درزه دار توسعه داده که ضریب همبستگی این شاخص 8/0 می باشد. مدل جدید در قطعه شمالی تونل انتقال آب کرمان مورد ارزیابی قرار گرفته که نتایج بیانگر مطابقت خوبی بین حفرپذیری پیش بینی شده با حفرپذیری واقعی دارد.
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