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岩土松散体内开挖救援通道的套筒式螺旋驱动掘进机自行进功能研究
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作者 卢清国 马少军 +1 位作者 姚文杰 张鹏 《现代隧道技术》 CSCD 北大核心 2023年第1期256-261,共6页
在发生山体滑坡或泥石流、隧道塌方、地震等地质灾害的岩土松散介质中快速、高效、及时地开挖救援通道到达有人员被困(埋)地点是抢险救援的首要任务。文章介绍一种新型的依赖多根平行装设于圆筒式掘进机外周的长螺旋体旋转,驱动整个掘... 在发生山体滑坡或泥石流、隧道塌方、地震等地质灾害的岩土松散介质中快速、高效、及时地开挖救援通道到达有人员被困(埋)地点是抢险救援的首要任务。文章介绍一种新型的依赖多根平行装设于圆筒式掘进机外周的长螺旋体旋转,驱动整个掘进机在岩土松散体内自主穿行开挖救援通道的掘进技术和装备,分析了掘进机的机构构成和自主前行动作机理,推导了套筒式螺旋驱动掘进机自主前行的条件。利用室内试验得到的螺旋齿高、齿根距和牙型角各参数的合理数值,研制了螺旋驱动套筒式试验样机。现场试验中,样机在松散土体内自主前行了10 m距离,证明了掘进机利用螺旋驱动原理在松散岩土类介质中自主前行开挖救援通道的可行性,为类似灾害事故中抢救被困人员的救援通道施工提供了安全、快速的施工技术和装备。 展开更多
关键词 螺旋驱动 套筒式结构 自主前行 掘进机 救援通道
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Peer Teaching as a Pedagogical Strategy for Autonomy in Teacher Education
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作者 Phil BENSON WING Danjun 《Chinese Journal of Applied Linguistics》 2013年第1期49-67,共19页
This action research study investigates peer teaching as a pedagogical strategy to raise pre- service second language teachers' awareness of autonomy in learning and teaching. Classroom observation, focus group inter... This action research study investigates peer teaching as a pedagogical strategy to raise pre- service second language teachers' awareness of autonomy in learning and teaching. Classroom observation, focus group interviews, and questionnaire were used to (a) explore how the student teachers engaged in the practices of peer teaching and learning and reflected on their relevance to their own future teaching careers and (b) identify the major benefits and challenges of peer teaching from the students' perspectives. Most of the students actively engaged in peer teaching during the course and considered it as a strategy that they might later use in their teaching. Issues such as awareness of teaching elements, opportunities for peer learning, cultural diversity, and English as a medium of instructions brought both benefits and challenges for students in the process of peer teaching. The study points to a research agenda for pre-service teacher education for autonomy that focuses on the long-term impact of students' experiences of a range of pedagogical strategies for autonomy on their future teaching. 展开更多
关键词 peer teaching pedagogical strategy autonomous learning teacher education
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