کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
277491 1430245 2014 17 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Numerical study of failure behaviour of pre-cracked rock specimens under conventional triaxial compression
ترجمه فارسی عنوان
بررسی عددی رفتار شکست در نمونه های سنگی قبل از ترک خورده تحت فشرده سازی سه بعدی
کلمات کلیدی
شبیه سازی عددی، نقصهای پیشین موجود در مغناطیسی، تکامل شکاف، سنگ ناهمگن
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی عمران و سازه
چکیده انگلیسی

Macroscopic pre-existing flaws play an important role in evaluating the strength and the failure modes of a heterogeneous rock mass. Crack initiation, propagation and coalescence from macroscopic pre-existing flaws are considered in a 3-D numerical model (RFPA3D) to investigate their effects on the underlying failure modes of rock. A feature of the code RFPA3D is that it can numerically simulate the evolution of cracks in three-dimensional space, as well as the heterogeneity of the rock mass. Three types of flaw geometries were evaluated numerically against experimental results: Type A for intact specimen, and Types B and C for flawed cylindrical specimens with different macroscopic pre-existing flaws, respectively. The effect of confining pressure on the fracture evolution was also considered. Numerical results showed that both the ligament angle and the flaw angle of two pre-existing cracks can affect the uniaxial compressive strength of the specimen and the mechanism of fracture evolution. In addition, both the uniaxial compressive strength and the accumulated acoustic emission increase with increasing heterogeneity.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Solids and Structures - Volume 51, Issue 5, 1 March 2014, Pages 1132–1148
نویسندگان
, , , , ,