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锚根埋深的计算方法
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作者 申继红 《水利水电科技进展》 CSCD 2002年第2期25-27,共3页
根据对锚根附近应力场的分析 ,指出锚根可能破坏的几种情况 ,同时指出以往计算锚根埋深公式存在的问题 .针对这些问题 。
关键词 计算方法 锚根 埋深长度 岩体 弹性力学
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复杂山区铁路地质选线中工程主要控制因素分析 被引量:4
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作者 杨昌义 王朋 +1 位作者 王小兵 蒋兴凯 《高速铁路技术》 2022年第1期89-92,共4页
在山区铁路选线中,地质选线与工程选线是一个互动、动态调整的系统工程。本文通过梳理桥梁、隧道和路基在地质选线阶段的主控因素,并结合工程实践进行分析探讨,以便地质工程师尽快找到合适的方案,减少不必要的工作。
关键词 地质选线 工程选线 隧道长度 桥梁跨度与墩高 路基
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Effects of Fragmentation Intensity of Perennial Roots and Their Burial Depth on Sprouting and Early Growth of Alternanthera philoxeroides(Mart.)Griseb
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作者 陈中义 邹云胜 +2 位作者 陈燕丽 张中华 许兴蕾 《Agricultural Science & Technology》 CAS 2010年第6期103-105,111,共4页
[Objective] The aim was to provide theoretical basis for the prevention and control of the invasion of Alternanthera philoxeroides(Mart.)Griseb.[Method] Effects of fragmentation intensity of fresh roots and their bu... [Objective] The aim was to provide theoretical basis for the prevention and control of the invasion of Alternanthera philoxeroides(Mart.)Griseb.[Method] Effects of fragmentation intensity of fresh roots and their burial depth on sprouting and early growth of A.philoxeroides were studied by control test.[Result] More sprouts of A.philoxeroides emerged when the fragmentation intensity of fresh roots was higher,while if the fragmentation intensity of fresh roots was lower,the early growth of A.philoxeroides was more rapid.The soil buried depth had significant effect on fresh root sprouts' emergence,but once fresh root sprouts could reach the soil surface and were given enough growth time,even if the fresh roots were buried in different depths,soil buried depth had no significant effect on its young plant growth.[Conclusion] If different fragmentation intensities of fresh roots present,there is a kind of trade-off strategy between root sprouts' emergence and plant' early growth,by which A.philoxeroides can invade new habitat successfully.To control the invasion of A.philoxeroides,it is critical to prevent its fresh root sprouts from emerging to soil surface,that is,to bury the fresh roots at a further soil depth. 展开更多
关键词 Alternanthera philoxeroides(Mart.)Griseb Perennial root fragment Soil buried depth SPROUTING Young plant growth
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Collapse mechanism of deep tunnels with three-centered arch cross section 被引量:2
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作者 李永鑫 姚聪 《Journal of Central South University》 SCIE EI CAS CSCD 2016年第12期3293-3301,共9页
The possible collapse of different circumstances is derived with the help of the limit analysis theory.Analytical equations related to collapsing mechanisms in deep tunnel with smooth three-centered arc cross sections... The possible collapse of different circumstances is derived with the help of the limit analysis theory.Analytical equations related to collapsing mechanisms in deep tunnel with smooth three-centered arc cross sections are derived on the basis of Hoek-Brown failure criterion and upper bound limit analysis.The pore water pressure is considered in the analysis,as a work rate of external force.Numerical results about the shape of detaching curve and the weight of collapsing block per unit length corresponding to different parameters are obtained with the help of mathematical software.The shapes of collapsing block are drawn with respected to different parameters.Furthermore,the effects of different parameters on the shape of detaching curve and the weight of the collapsing block are discussed. 展开更多
关键词 deep-buffed tunnel collapse mechanism Hoek-Brown criterion limit analysis
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