بررسی فرونشست زمین ، مطالعه موردی:فرونشست زمین استخرهای تغذیه مصنوعی جنوب نیروگاه همدان ،شمالغرب ایران
محورهای موضوعی : برگرفته از پایان نامه
1 - عضو هئیت علمی دانشگاه شهید بهشتی
کلید واژه: "فرونشست زمین", "تغذیه مصنوعی", "رسوبات ریزدانه", "تفاوت کیفی آب ها",
چکیده مقاله :
در این مقاله پدیده فرونشست زمین ، درز و شکاف های ایجاد شده در طرح تغذیه مصنوعی جنوب نیروگاه شهید مفتح همدان به صورت موردی تحقیق شده است. پدیده ایجاد شده در زمین شناسی وآب زیرزمینی نادر بوده که در این تحقیق مشخصات هندسی درز و شکافهای استخرهای تغذیه اندازه گیری شده است. لوگ های زمین شناسی موجود از محل بررسی و نتایج گویای وجود لایه های ریز دانه در ساختمان زمین شناسی آبخوان است که در اثر بهره برداری بی رویه آب زیرزمینی جابجا شده اند که ماسه دهی چاه های آب نیروگاه واطراف آن شاهدی بر اِین ادعا می باشد. در سایت تغذیه مصنوعی مورد بررسی این تحقیق تفاوت کیفیت آب تغذیه وآب آبخوان به ناپایداری وتحرک بیشتر رسوبات دانه ریزوجابجائی آنهاشدت بخشیده وافزون بر آن عدم رعایت خصوصیات هیدرولیک چاه های تغذیه باعث ایجاد جریان آشفته وجابجائی بیشتر رسوبات دانه ریز ودر نتیجه فرونشست زمین در استخرهای تغذیه شده است .
In this article the phenomenon of land subsidence and the resulting cracks and fissures of artificial recharge plan of Hamedan Shahid Mofateh power generation as case study has been investigated. This is an unusual phenomenon and in this research the geometrical properties of the fissures of recharge ponds are measured. The results reveal the existence of fine layers in the geology of the aquifer, which are displaced in the long run as the consequence of groundwater overdraft. Sand making of some of the water wells around study area is proof of this claim. At the site of the artificial recharge subject of this research, the difference between the quality of recharge water and the aquifer and their interaction have intensified the instability and the movement of the fine sediments. In addition, the neglect of hydraulic principles of the groundwater during the construction and operation of the recharge wells has resulted in turbulent and speed flows, intensified displacement of fine sand and ultimately the localized subsidence at the site of the plan.
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