摘要
废物回取试验是一个在瑞典sp地下实验室完成的,历时近5a,为全尺寸处置库模拟加热试验。试验在一个直径φ1.75m、深度8.5m的钻孔中进行。开挖和加热后周边岩石中的温度升高、应力改变,因此,试验中岩石中可能产生的损伤是工程设计中关心的课题之一。为此,试验结束后,在试验孔3个不同深度处沿垂直和平行于最大主应力方向施打6个深度约1.5m的近水平取样孔,并采集了12组岩样。对这12组岩样用MTS815岩石力学试验系统进行了单轴抗压强度试验。从单轴抗压强度、裂隙起始应力、裂隙损伤应力、最大裂隙体积应变和最大总体变进行了对比和分析,试验结果分析表明:从最大裂隙体积应变分析,在垂直于最大主应力方向的处置孔孔壁的岩石上可能存在一些轻微的微破裂为特征的损伤。从宏观力学特性来说,岩石没有任何可测的损伤。
The canister retrieval test（CRT） was a test of a full-scale copy of a repository carried out from October 2000 to November 2005 at Aspo underground laboratory. Due to the excavation of the deposition hole DD0092G01 and the heating in the canister within the hole, there was a concern for the CRT rock volume if the changed stress around the deposition hole could lead to microfracturing in or other damage to the surrounding rocks. For this purpose, uniaxial compression testing has been performed on 12 core samples taken from different parts of sub-horizontal core boreholes drilled at three depths in DD0092G01 in the directions parallel and perpendicular to that of the major principal stress. The uniaxial compression strength（UCS） and Young＇s modulus, the crack initiation stress（σci）, crack damage stress（σcd ）, and the maximum crack volumetric strain（εvcmax） and maximum total volumetric strain（εvmax） have been compiled and analyzed. Comparisons were made according to the sampled direction to the major principal stress and the distance to deposition hole wall. It has been inferred from the slightly higher values of maximum crack volumetric strain that some damages, but only to a small extent and in the form of micro-fracturing, occurred in the rock near the deposition hole wall in the direction perpendicular to the major principal stress. There is no evidence of any damage from other mechanical properties.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2008年第8期1601-1609,共9页
Chinese Journal of Rock Mechanics and Engineering
基金
IAEAfellowship(C6/CPR/05058)
关键词
高放废物
废物罐回取试验
单轴抗压强度试验:最大裂隙体积应变
损伤
high-level radioactive waste
canister retrieval test（CRT）
uniaxial compression strength（UCS） testing
maximum crack volumetric strain
damage
