1.0Robbinshttps://www.robbinstbm.com/zh-hans/Tunneling in Mixed Face Conditions: An Enduring Challenge for EPB TBM Excavation - Robbinsrich600338<blockquote class="wp-embedded-content" data-secret="V61kTPAWbn"><a href="https://www.robbinstbm.com/zh-hans/tunneling-in-mixed-face-conditions/">Tunneling in Mixed Face Conditions: An Enduring Challenge for EPB TBM Excavation</a></blockquote><iframe sandbox="allow-scripts" security="restricted" src="https://www.robbinstbm.com/zh-hans/tunneling-in-mixed-face-conditions/embed/#?secret=V61kTPAWbn" width="600" height="338" title="“Tunneling in Mixed Face Conditions: An Enduring Challenge for EPB TBM Excavation” — Robbins" data-secret="V61kTPAWbn" frameborder="0" marginwidth="0" marginheight="0" scrolling="no" class="wp-embedded-content"></iframe><script type="text/javascript">
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https://www.robbinstbm.com/wp-content/uploads/2019/07/Image-4-RGB.jpg35102340EPB TBM tunneling in mixed face conditions—partially in both rock and soil—is inherently problematic for even the most experienced crews. Over-excavation, excessive damage to cutter tools and regular cutterhead interventions are major challenges when negotiating mixed face geology. This paper draws from real field experiences, including successful bores in abrasive rock and soil at India’s Chennai and Bangalore metro projects, to determine the optimal operational parameters for TBMs in such conditions.