کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6409493 1332870 2016 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Research papersLaboratory investigation of nonlinear flow characteristics in rough fractures during shear process
ترجمه فارسی عنوان
تحقیقات آزمایشگاهی ویژگی های جریان غیرخطی در شکستگی های خشن در طی فرایند برش
کلمات کلیدی
شکست سنگ آزمایش جریان برش، جریان غیرخطی شماره رینولدز بحرانی،
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فرآیندهای سطح زمین
چکیده انگلیسی


- One dimensional coupled shear-flow tests were conducted.
- The coefficients of Forchheimer's and Izbash's laws are quantified.
- Nonlinear flow behavior is discussed.
- Variation of the critical Reynolds number during shear process is analyzed.

To understand the influence of shear behavior on the transporting properties of fluid through a single fracture, splitting fractures were made in the laboratory and shear flow tests were carried out under constant normal load conditions. The applied normal stress is in the range of 0.5-3.0 MPa. Before the physical test, the fracture's morphology is measured for identification of the roughness. At each shear step, we performed 5-8 high precise hydraulic tests with different hydraulic gradient. The relationship between pressure gradient and volume flow rate demonstrates to be nonlinear and fits very well with Forchheimer's and Izbash's laws. The linear and nonlinear coefficients in Forchheimer's law are quite sensitive to shear deformation (closure or dilation), experienced 1-2 and 1-3 orders of magnitude reduction during shear, respectively. An empirical equation is proposed to quantify the relationship between linear coefficient and nonlinear coefficient based on the experimental observations. The two coefficients in Izbash's law are quantified. The m value is in the range between 1.06 and 1.41 and the λ value experiences a reduction of 1-2 orders of magnitude during shear. In addition, the studied critical Reynolds number exhibits a decreasing and increasing variation corresponding to shear contraction and shear dilation of rock fracture. For all the cases in this study, the critical Reynolds number ranges between 1.5 and 13.0.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Hydrology - Volume 541, Part B, October 2016, Pages 1385-1394
نویسندگان
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