Discontinuity network modeling of the rock mass around a tunnel close to the proposed permanent shiplock area of the three gorges dam site in China

Pinnaduwa Kulatilake, Jianping Chen, Jianren Teng, Gang Pan, Xiao Shufang

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Abstract

Discontinuity data of a 400 m tunnel located close to the proposed shiplock area were investigated to characterize the discontinuity geometry of the rock mass around the tunnel. Traces of 39 major discontinuities (faults and dykes) were found on the tunnel exposures. Over 2000 minor discontinuity (joint) trace data available showed that the rock mass can be separated into about 5 statistically homogeneous regions. Three to four joint sets were found to exist in each of these regions. Available theoretical probability distributions were found to be insufficient to represent the statistical distribution of orientation of joint clusters. For more than 94% of the joint sets, gamma distribution was found to be the best probability distribution for representing a joint size distribution. Exponential and gamma distributions turned out to be the best probability distributions for representing joint spacing distributions for the joint data studied here. Too many censored joint trace data showed a very significant effect of the trace length biases on the estimated mean trace length. This indicated that the 2 m wide exposures which were used for collecting the joint trace data are not sufficient to produce reliable estimates for joint size parameters for the Shiplock area To obtain better estimates, it is necessary to collect joint data for several exposures which are at least 4-5 m wide and have different orientations. When such data become available for the Three Gorges region, validation studies should be performed to check the applicability of the built-up models, in addition to performing the modelling. Rock Mechanics, Daemen & Schultz (eds).

Original languageEnglish (US)
Title of host publication35th U.S. Symposium on Rock Mechanics, USRMS 1995
Editors Daemen, Schultz
PublisherAmerican Rock Mechanics Association (ARMA)
Pages807-812
Number of pages6
ISBN (Print)9054105526, 9789054105527
StatePublished - Jan 1 1995
Event35th U.S. Symposium on Rock Mechanics, USRMS 1995 - Reno, United States
Duration: Jun 5 1995Jun 7 1995

Other

Other35th U.S. Symposium on Rock Mechanics, USRMS 1995
CountryUnited States
CityReno
Period6/5/956/7/95

Fingerprint

dams
canyons
gorge
Probability distributions
Dams
tunnels
China
discontinuity
Tunnels
tunnel
dam
Rocks
rocks
rock
modeling
Rock mechanics
rock mechanics
Geometry
estimates
statistical distributions

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

Cite this

Kulatilake, P., Chen, J., Teng, J., Pan, G., & Shufang, X. (1995). Discontinuity network modeling of the rock mass around a tunnel close to the proposed permanent shiplock area of the three gorges dam site in China. In Daemen, & Schultz (Eds.), 35th U.S. Symposium on Rock Mechanics, USRMS 1995 (pp. 807-812). American Rock Mechanics Association (ARMA).

Discontinuity network modeling of the rock mass around a tunnel close to the proposed permanent shiplock area of the three gorges dam site in China. / Kulatilake, Pinnaduwa; Chen, Jianping; Teng, Jianren; Pan, Gang; Shufang, Xiao.

35th U.S. Symposium on Rock Mechanics, USRMS 1995. ed. / Daemen; Schultz. American Rock Mechanics Association (ARMA), 1995. p. 807-812.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Kulatilake, P, Chen, J, Teng, J, Pan, G & Shufang, X 1995, Discontinuity network modeling of the rock mass around a tunnel close to the proposed permanent shiplock area of the three gorges dam site in China. in Daemen & Schultz (eds), 35th U.S. Symposium on Rock Mechanics, USRMS 1995. American Rock Mechanics Association (ARMA), pp. 807-812, 35th U.S. Symposium on Rock Mechanics, USRMS 1995, Reno, United States, 6/5/95.
Kulatilake P, Chen J, Teng J, Pan G, Shufang X. Discontinuity network modeling of the rock mass around a tunnel close to the proposed permanent shiplock area of the three gorges dam site in China. In Daemen, Schultz, editors, 35th U.S. Symposium on Rock Mechanics, USRMS 1995. American Rock Mechanics Association (ARMA). 1995. p. 807-812
Kulatilake, Pinnaduwa ; Chen, Jianping ; Teng, Jianren ; Pan, Gang ; Shufang, Xiao. / Discontinuity network modeling of the rock mass around a tunnel close to the proposed permanent shiplock area of the three gorges dam site in China. 35th U.S. Symposium on Rock Mechanics, USRMS 1995. editor / Daemen ; Schultz. American Rock Mechanics Association (ARMA), 1995. pp. 807-812
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abstract = "Discontinuity data of a 400 m tunnel located close to the proposed shiplock area were investigated to characterize the discontinuity geometry of the rock mass around the tunnel. Traces of 39 major discontinuities (faults and dykes) were found on the tunnel exposures. Over 2000 minor discontinuity (joint) trace data available showed that the rock mass can be separated into about 5 statistically homogeneous regions. Three to four joint sets were found to exist in each of these regions. Available theoretical probability distributions were found to be insufficient to represent the statistical distribution of orientation of joint clusters. For more than 94{\%} of the joint sets, gamma distribution was found to be the best probability distribution for representing a joint size distribution. Exponential and gamma distributions turned out to be the best probability distributions for representing joint spacing distributions for the joint data studied here. Too many censored joint trace data showed a very significant effect of the trace length biases on the estimated mean trace length. This indicated that the 2 m wide exposures which were used for collecting the joint trace data are not sufficient to produce reliable estimates for joint size parameters for the Shiplock area To obtain better estimates, it is necessary to collect joint data for several exposures which are at least 4-5 m wide and have different orientations. When such data become available for the Three Gorges region, validation studies should be performed to check the applicability of the built-up models, in addition to performing the modelling. Rock Mechanics, Daemen & Schultz (eds).",
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