高放废物处置巷道尺度岩体适宜性评价

doi:10.11720/wtyht.2024.1553

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Abstract

Rock mass suitability evaluation is a core part of the siting and design of a disposal repository for high-level radioactive waste, aiming to determine whether the rock masses at the site meet the functional requirements for long-term containment and radionuclides isolation. Based on the previously proposed site-scale evaluation method (Q_HLW) of rock mass suitability, this study further developed criteria for the tunnel-scale evaluation of rock mass suitability and established a two-phase evaluation system consisting of pre-evaluation and final evaluation. Additionally, in combination with geological and hydrological data revealed by demonstration tunnel 1 (DT1) at the site of the ONKALO underground research laboratory in Finland, this study tested and verified the criteria of the two-phase evaluation system on the disposal tunnel scale. The comparison between the suitability evaluation results obtained using the optimized Q_HLW and the qualitative evaluation results determined using the rock suitability classification (RSC) rock mass grading method indicates that both methods yielded roughly consistent results. This confirms the feasibility of the tunnel-scale evaluation method of rock mass suitability.

Key words： geological disposal of high-level radioactive waste evaluation of rock mass suitability tunnel-scale

Received: 21 December 2023 Published: 08 January 2025

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	Articles by authors
	Yong YE
	Liang CHEN
	Jian LIU

Cite this article:

Yong YE,Liang CHEN,Jian LIU. Tunnel-scale evaluation of rock mass suitability for the disposal of high-level radioactive waste[J]. Geophysical and Geochemical Exploration, 2024, 48(6): 1545-1552.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2024.1553 OR https://www.wutanyuhuatan.com/EN/Y2024/V48/I6/1545

处置罐体材料	地下水化学环境	$C c h m, c T$
铜	同时满足以下2个条件:(1)7<pH<10;(2)[SO₄^2-]<[Cl^-]<2 500 mg·L^-1	1.0
	仅满足以下1个条件:(1)7<pH<10;(2)[SO₄^2-]<[Cl^-]<2 500 mg·L^-1	0.8
	以下2个条件均不满足:(1)7<pH<10;(2)[SO₄^2-]<[Cl^-]<2 500 mg·L^-1	0.1
碳钢	同时满足以下2个条件:(1)8<pH<9.5;(2)[HCO₃^-]<6 000 mg·L^-1且[Cl^-]<3 000 mg·L^-1	1.0
	仅满足以下1个条件:(1)8<pH<9.5;(2)[HCO₃^-]<6 000 mg·L^-1且[Cl^-]<3 000 mg·L^-1	0.8
	以下2个条件均不满足:(1)8<pH<9.5;(2)[HCO₃^-]<6 000 mg·L^-1且[Cl^-]<3 000 mg·L^-1	0.1

Scope of corrosion resistance coefficient of disposal canister

地下化学环境	$C c h m, b T$ 取值
同时满足以下3个条件:(1)6<pH<10;(2)TDS<10 g·L^-1;3)I>10^-3mol·L^-1	1.0
满足以下3个条件中的2个:(1)6<pH<10;(2)TDS<10 g·L^-1;3)I>10^-3mol·L^-1	0.8
仅能满足以下3个条件中的1个或均不满足:(1)6<pH<10;(2)TDS<10 g·L^-1;3)I>10^-3mol·L^-1	0.1

Scope of corrosion resistance coefficient of cushion material

$Q H L W T$	质量等级		适宜性描述
(400,+∞]	Ⅰ	适宜	岩体适宜性程度高,适合作为处置岩体
(10,400]	Ⅱ	基本适宜	岩体适宜性程度一般,需要做更深入的研究,确定是否存在其他影响适宜性因素
≤10	Ⅲ	不适宜	对该岩体应采取避开策略

Evaluation standard for suitability of Q_HLW at tunnel scale

Schematic diagram of demonstration disposal area layout of ONKALO site

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Fault zone and fracture distribution of DT1^[12]

The value of the fracture influence index in DT1

Chemical characteristics of groundwater in DT1^[13]

14]
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Permeability characteristics of rock in DT1^[14]

The value of the permeability index in DT1

14]
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Flow distribution in DT1^[14]

The value of the flow index in DT1

14]
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Rock mass integrity index of DT1^[14]

Suitability evaluation results of Q_HLW in DT1

2]
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Suitability evaluation results of RSC in DT1^[2]

Schematic diagram of Q_HLW engineering evaluation system

18]
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Schematic diagram of disposal hole layout of DT1^[18]

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