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Experimental Study on Stress-Dependent Nonlinear Flow Behavior and Normalized Transmissivity of Real Rock Fracture Networks
المؤلفون المشاركون
Yu, Li-yuan
Jing, Hong-wen
Su, Haijian
Yin, Qian
Liu, Richeng
Ma, Guowei
المصدر
العدد
المجلد 2018، العدد 2018 (31 ديسمبر/كانون الأول 2018)، ص ص. 1-16، 16ص.
الناشر
Hindawi Publishing Corporation
تاريخ النشر
2018-04-24
دولة النشر
مصر
عدد الصفحات
16
التخصصات الرئيسية
الملخص EN
The mechanism and quantitative descriptions of nonlinear fluid flow through rock fractures are difficult issues of high concern in underground engineering fields.
In order to study the effects of fracture geometry and loading conditions on nonlinear flow properties and normalized transmissivity through fracture networks, stress-dependent fluid flow tests were conducted on real rock fracture networks with different number of intersections (1, 4, 7, and 12) and subjected to various applied boundary loads (7, 14, 21, 28, and 35 kN).
For all cases, the inlet hydraulic pressures ranged from 0 to 0.6 MPa.
The test results show that Forchheimer’s law provides an excellent description of the nonlinear fluid flow in fracture networks.
The linear coefficient a and nonlinear coefficient b in Forchheimer’s law J=aQ+bQ2 generally decrease with the number of intersections but increase with the boundary load.
The relationships between a and b can be well fitted with a power function.
A nonlinear effect factor E=bQ2/(aQ+bQ2) was used to quantitatively characterize the nonlinear behaviors of fluid flow through fracture networks.
By defining a critical value of E = 10%, the critical hydraulic gradient was calculated.
The critical hydraulic gradient decreases with the number of intersections due to richer flowing paths but increases with the boundary load due to fracture closure.
The transmissivity of fracture networks decreases with the hydraulic gradient, and the variation process can be estimated using an exponential function.
A mathematical expression T/T0=1-exp(-αJ-0.45) for decreased normalized transmissivity T/T0 against the hydraulic gradient J was established.
When the hydraulic gradient is small, T/T0 holds a constant value of 1.0.
With increasing hydraulic gradient, the reduction rate of T/T0 first increases and then decreases.
The equivalent permeability of fracture networks decreases with the applied boundary load, and permeability changes at low load levels are more sensitive.
نمط استشهاد جمعية علماء النفس الأمريكية (APA)
Yin, Qian& Jing, Hong-wen& Liu, Richeng& Ma, Guowei& Yu, Li-yuan& Su, Haijian. 2018. Experimental Study on Stress-Dependent Nonlinear Flow Behavior and Normalized Transmissivity of Real Rock Fracture Networks. Geofluids،Vol. 2018, no. 2018, pp.1-16.
https://search.emarefa.net/detail/BIM-1158605
نمط استشهاد الجمعية الأمريكية للغات الحديثة (MLA)
Yin, Qian…[et al.]. Experimental Study on Stress-Dependent Nonlinear Flow Behavior and Normalized Transmissivity of Real Rock Fracture Networks. Geofluids No. 2018 (2018), pp.1-16.
https://search.emarefa.net/detail/BIM-1158605
نمط استشهاد الجمعية الطبية الأمريكية (AMA)
Yin, Qian& Jing, Hong-wen& Liu, Richeng& Ma, Guowei& Yu, Li-yuan& Su, Haijian. Experimental Study on Stress-Dependent Nonlinear Flow Behavior and Normalized Transmissivity of Real Rock Fracture Networks. Geofluids. 2018. Vol. 2018, no. 2018, pp.1-16.
https://search.emarefa.net/detail/BIM-1158605
نوع البيانات
مقالات
لغة النص
الإنجليزية
الملاحظات
Includes bibliographical references
رقم السجل
BIM-1158605
قاعدة معامل التأثير والاستشهادات المرجعية العربي "ارسيف Arcif"
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