skip to main content

Title: Analysis of geomechanical behavior for the drift scale test

The Yucca Mountain Site Characterization Project is conducting a drift scale heater test, known as the Drift Scale Test (DST), in an alcove of the Exploratory Studies Facility at Yucca Mountain, Nevada. The DST is a large-scale, long-term thermal test designed to investigate coupled thermal-mechanical-hydrological-chemical behavior in a fractured, welded tuff rock mass. The general layout of the DST is shown in Figure 1a, along with the locations of several of the boreholes being used to monitor deformation during the test. Electric heaters are being used to heat a planar region of rock that is approximately 50 m long and 27 m wide for 4 years, followed by 4 years of cooling. Both in-drift and ''wing'' heaters are being used to heat the rock. The heating portion of the DST was started in December, 1997, and the target drift wall temperature of 200 C was reached in summer 2000. A drift-scale distinct element model (DSDE) is being used to analyze the geomechanical response of the rock mass forming the DST. The distinct element method was chosen to permit explicit modeling of fracture deformations. Shear deformations and normal mode opening of fractures are expected to increase fracture permeability and thereby altermore » thermal-hydrologic behavior in the DST. This paper will describe the DSDE model and present preliminary results, including comparison of simulated and observed deformations, at selected locations within the test.« less
Authors:
; ;
Publication Date:
OSTI Identifier:
15005970
Report Number(s):
UCRL-JC-141552
TRN: US0400189
DOE Contract Number:
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Conference: 2001 International High-Level Radioactive Waste Management Conference, Las Vegas, NV (US), 04/29/2001--05/03/2001; Other Information: PBD: 17 Nov 2000
Research Org:
Lawrence Livermore National Lab., CA (US)
Sponsoring Org:
US Department of Energy (US)
Country of Publication:
United States
Language:
English
Subject:
12 MANAGEMENT OF RADIOACTIVE WASTES, AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; 58 GEOSCIENCES; BOREHOLES; DEFORMATION; FRACTURES; HEATERS; HEATING; HIGH-LEVEL RADIOACTIVE WASTES; MONITORS; PERMEABILITY; SHEAR; SIMULATION; SITE CHARACTERIZATION; TARGETS; TUFF; YUCCA MOUNTAIN