A new rock cutting and splitting method for hard-rock excavation: methodology, scaled model test and numerical modelling, and field validation

IF 8.7 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Tunnelling and Underground Space Technology Pub Date : 2026-05-01 Epub Date: 2026-01-24 DOI:10.1016/j.tust.2026.107477

Jung-Woo Cho , Hoyoung Jeong , Sang-Hwa Yu , Hee-Suk Lee

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Abstract

Rock cutting and splitting is a new mechanical excavation method that consists of two steps: cutting with a saw and splitting with a wedge. The rock is cut to a prescribed depth in the first step, then each block is split by inserting a wedge into the cut. The main failure mechanism is tensile crack propagation from the base of the block towards the free face. We introduce an analytic solution to estimate the required indenting force. A series of scaled model tests confirmed that effective block separation occurs when the spacing-to-depth ratio is <2.0. Numerical models reproduce the tensile fracturing mechanism and validate the experimental results. Finally, in situ excavation tests on a granite slope and a simulated tunnel face demonstrate the applicability of the method to real-world situations. In hard rock (UCS > 100 MPa), the net cutting rate of CS method was 20 %–30 % higher than that predicted for roadheaders and more than 600 % higher than that of impact hammers. Photogrammetric surveys confirmed that the block shape matches the intended shape, suggesting the potential reuse of the blocks as construction material.

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硬岩开挖切割劈裂新方法：方法学、比例模型试验与数值模拟及现场验证

岩石切割劈裂是一种新型的机械开挖方法，主要由锯切和楔劈两步组成。在第一步中，岩石被切割到规定的深度，然后通过在切口中插入楔子来分割每个块。主要破坏机制是张拉裂纹从块体底部向自由面扩展。我们引入了一个解析解来估计所需的压痕力。一系列比例模型试验证实，当距深比为2.0时，块体分离效果明显。数值模型模拟了拉伸致裂机理，验证了实验结果。最后，对花岗岩边坡和模拟隧道工作面进行了现场开挖试验，验证了该方法对实际情况的适用性。在硬岩（UCS > 100 MPa）中，CS法的净切削率比掘进机的预测切削率高20% - 30%，比冲击锤的预测切削率高600%以上。摄影测量调查证实了街区的形状符合预期的形状，这表明这些街区有可能被用作建筑材料。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Tunnelling and Underground Space Technology 工程技术-工程：土木

CiteScore

11.90

自引率

18.80%

发文量

454

审稿时长

10.8 months

期刊介绍： Tunnelling and Underground Space Technology is an international journal which publishes authoritative articles encompassing the development of innovative uses of underground space and the results of high quality research into improved, more cost-effective techniques for the planning, geo-investigation, design, construction, operation and maintenance of underground and earth-sheltered structures. The journal provides an effective vehicle for the improved worldwide exchange of information on developments in underground technology - and the experience gained from its use - and is strongly committed to publishing papers on the interdisciplinary aspects of creating, planning, and regulating underground space.