The Analysis and Correction of Sampling Bias of Discontinuity Orientation Caused by Linear Sampling Technique

Abstract:

Orientation data of discontinuities are of paramount importance for rock engineering studies because they affect the rock slope stability and control the path of flow. Most orientation data are collected using linear sampling. However, data acquired by such linear sampling techniques are subject to bias, owing to the orientation of the sampling line. Even if a weighting factor is applied to orientation data to reduce this problem, the bias is not be significantly reduced when certain sampling orientations are involved. If the linear sampling orientation nearly parallels the discontinuity orientation, most of these parallel discontinuities are excluded from the survey results. To correct this bias ,a weighting factor is applied to orientation data first of all and then the orientation data in blindzone is corrected by added date from the different sampling line .The comprehensive pole and contour plots diagram is completed at last, which is consistent of the real situation. This method makes up for the deficiency of linear sampling technique and obtains the comprehensive orientation data in rock.

• Periodical: Advanced Materials Research (Volumes 690-693)
• Pages: 3580-3585
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.690-693.3580
• Online since: May 2013
• Authors: Yi Wei Wang, Zou Quan Luo, Hong Yan Zuo
• Keywords: Bias, Blindzone, Correction Method, Linear Sampling, Orientation Data of Discontinuities

References

[1] WANG Kui-hua.Geotechnical Engineering Investigation [D]. Beijing：china architecture &building press,2005.

[2] Beard, J., 1997. Parameters used for slope design of I-26 in North Carolina[J]. Proceedings of 48th Highway Geology Symposium, Knoxville, TN.

[3] Terzaghi, R.D., 1965. Source of error in joint surveys[J]. Geotechnique,1965, 15, 287– 304.

[4] Priest S.D. Rock Fractures and Fluid Flow: Contemporary Understanding and Applications[D]. Washington D.C.:NATIONAL ACADEMY PRESS,1996.

[5] Goodman, R.E., 1976. Methods of Geological Engineering in Discontinuities Rocks[J]. West, St. Paul, MN.

[6] Priest, S.D., 1993. Discontinuity Analysis for Rock Engineering[D].Chapman & Hall, London.

[7] Priest, S.D., 1985. Hemispherical Projection Methods in Rock Mechanics[D]. George Allen & Unwin, London.

[8] Baecher, G.B., 1983. Statistical analysis of rock mass fracturing[J]. Journal of Mathematical Geology 15 (2), 329–347.

DOI: 10.1007/bf01036074

[9] Kulatilake, P.H.S.W., Wu, T.H., 1984. Sampling bias on orientation of discontinuities[J]. Rock Mechanics and Rock Engineering 17,243– 253.

DOI: 10.1007/bf01032337

[10] Lanney ,N.A,1978.Statistical description of rock properties and sampling.MS Thesis,University of Michigan,IN,USA.

[11] Yow, J.L., 1987. Blind zones in the acquisition of discontinuity orientation data[J]. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts 23 (1), 19–28.

DOI: 10.1016/0148-9062(87)90868-0

[12] McEwen, T.J., 1980. Fracture Analysis of Crystalline Rocks: Field Measurements and Field Geometrical Techniques[J]. Institute of Geological Sciences, Harwell.

[13] Zhou chuang bing,ye zi tong,hanbing. A stugy on configulation and hydraulic conductivity of rock joints[J],advances in water science, 1997, (03):233-239 .