Identification and Mitigation of Error in the Terzaghi Bias Correction for Inhomogeneous Material Discontinuities

• Дата: 2016
• Автори: Tang, H.M., Huang, L., Bobet, A., EzEldin, M.A.M., Wang, L.Q., Wu, Y.P., Hu, X.L
• Формат: Стаття
• Мова: English
• Опубліковано: Інститут проблем міцності ім. Г.С. Писаренко НАН України 2016
• Назва видання: Проблемы прочности
• Теми: Научно-технический раздел
• Онлайн доступ: http://dspace.nbuv.gov.ua/handle/123456789/173560
• Назва журналу: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Цитувати: Identification and Mitigation of Error in the Terzaghi Bias Correction for Inhomogeneous Material Discontinuities / H.M. Tang, L. Huang, A. Bobet, M.A.M. EzEldin, L.Q. Wang, Y.P. Wu, X.L. Hu // Проблемы прочности. — 2016. — № 6. — С. 111-121. — Бібліогр.: 12 назв. — англ.

Use of the scanline mapping technique in geometric surveys of rock discontinuities can often lead to a bias, in that discontinuities are not always observed when they are at small angles to the scanline. Terzaghi introduced the concept of a blind zone to explain this bias, and developed a widely used procedure to correct for it. Unfortunately, little is known about errors that may occur when the Terzaghi procedure is used outside the blind zone. This paper presents a detailed derivation to show that such errors arise with this application of the Terzaghi procedure. This error was evaluated using simulated orientation data and a case study at Wenchuan, Sichuan, China (2008). The results of these tests suggest optimal values of grid size and sample density for reducing the error.