SKLGP大讲堂第120期 | Radhika Vidanage De Silva — Non-explosive damage initiation in rock: From Soundless Cracking Demolition Agents to Shape Memory Alloys

报告题目：Non-explosive damage initiation in rock: From Soundless Cracking Demolition Agents to Shape Memory Alloys

报告人：Radhika Vidanage De Silva

单位：苏黎世联邦理工学院（ETH Zurich）

时间：2025年6月20日10:00—11:30（周五）

地点：地灾全重211教室（珙桐对面）

个人简介：

Radhika Vidanage De Silva，是苏黎世联邦理工学院 (ETH Zurich) 工程地质系教席的高级研究助理兼讲师。他拥有澳大利亚莫纳什大学 (Monash University) 的岩土力学博士学位。他的研究工作专注于开发用于地下能源与资源开采过程的先进岩石破碎技术。他发明了一种非爆炸性岩石拆除剂专利，并于2022年获得了国际岩石力学学会 (ISRM) 罗哈奖 (Rocha Medal)，以表彰其在岩石力学领域的世界最佳博士论文，并同时获得莫纳什大学工程学最佳博士论文莫利·霍尔曼奖章 (Mollie Holman Medal)，以及维多利亚皇家学会 (Royal Society of Victoria) 颁发的青年科学家奖。他是美国岩石力学协会 (ARMA) 2023级未来领袖班成员。他当前的工作致力于开发形状记忆合金致动器 (Shape Memory Alloy actuators)，用于在钻孔中引发定向压裂，应用于原位开采和地热能提取。

报告简介：

Rock-mass pre-conditioning technologies are vital for deep-earth energy and resource extraction processes. Conventional rock stimulation techniques, including hydraulic stimulation and explosive blasting have limited control over fracture initiation around a borehole drilled in reservoir rock due to the abrupt release of strain energy. This talk explores a novel numerical simulation method that explores two mechanical pre-conditioning methods that enable controlled fracture initiation around a borehole to supplement conventional hydraulic fracturing techniques.

First, we introduce a strain-energy-based numerical simulation approach to model the use of Soundless Cracking Demolition Agents (SCDA) to initiate controlled fractures around a borehole. Compared to existing methods, this numerical modelling approach eliminates the need for recalibration of the model depending on parameters such as confining pressure and surrounding rock type. We highlight the strengths and limitations of SCDA for sub-surface rock fracturing applications.

To address these limitations, we investigate the use of Shape Memory Alloy (SMA) rock splitters to initiate directional fractures around a borehole, which was also numerically simulated using similar principles. We experimentally investigated the directional fracture initiation capabilities of SMA and the controllability of fractures. Finally, the numerical model was extended to simulate in-situ stress conditions, which will lay the groundwork for future sub-surface rock pre-conditioning applications.

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