Results 31 to 40 of about 4,128 (203)
Study on water inrush failure mode of karst tunnel based on three-dimensional discrete-continuous coupling [PDF]
During the construction of karst tunnel, it is difficult to avoid approaching the cavern, even high pressure water cavern. Water inrush damage very easily causes safety accidents and would have irreversible impact on the tunnel.
Baohua DENG +5 more
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Jianzhu Gangjiegou Jinzhan, 2020 采用有限元方法对自攻螺钉搭接连接薄钢板在高温下的抗剪性能进行了研究。薄钢板厚度分别采用0.42mm,1.20mm,1.90mm;通过改变温度和自攻螺钉的布置方式,研究抗剪连接件的承载力和破坏模式。分析结果表明:自攻螺钉搭接连接薄钢板在剪力作用下,会发生明显的倾斜;自攻螺钉沿受力方向布置时的承载力略高于垂直受力方向布置时的承载力,两者破坏模式相似;节点在高温下的破坏模式与在常温下类似。将模拟结果与冷成型钢设计规范的预测结果进行比较,发现现行规范可以较准确地预测抗剪连接件的破坏模式,而对其承载力的预测 ...
张曼 +4 more
doaj
Deformation characteristics and treatment measures of dangerous rock collapse in an expressway in Chongqing [PDF]
In this paper, five dangerous rockfall collapses at K1515 of the Shanghai-Chengdu expressway are taken as the research object. Through investigation, statistics, and analysis, the engineering geological conditions and developmental deformation ...
Hongwei LI, Qianyi ZHANG, Xiaogang CHEN
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Jianzhu Gangjiegou Jinzhan, 2023 为研究窄翼缘PEC中长柱轴压整体稳定性能，设计制作9根组合长细比介于76~141（正则化长细比介于0.84~1.55）的窄翼缘PEC中长柱，进行轴压整体稳定性能试验。研究窄翼缘PEC中长柱的初始弯曲、长细比、混凝土强度等因素对其破坏模式和轴压整体稳定承载力的影响。试验结果表明，窄翼缘PEC中长柱在轴压荷载下的破坏模式表现为绕弱轴的弯曲失稳，长细比和初始弯曲显著影响试件的破坏模式和极限承载力。当试件的正则化长细比大于1.0，初始弯曲大于L/1 000时，试件的破坏模式表现为整体极值点失稳 ...
张文轩 +5 more
doaj
Experimental study on uniaxial compressive strength characteristics of conventional model ice in tank [PDF]
ObjectiveIn the ice-propeller milling or collision test, in order to accurately test the ice load of the propeller, it is very important to use model ice which satisfies similarity with the geometric and mechanical properties of real ice.MethodsUniaxial ...
Chao WANG, Longhui LI, Pei XU
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Conservation Biology, Volume 38, Issue 3, June 2024.Abstract Ecosystem state transitions can be ecologically devastating or be a restoration success. State transitions are common within aquatic systems worldwide, especially considering human‐mediated changes to land use and water use. We created a transferable conceptual framework to enable multiscale assessments of state resilience and early warnings ...
John T. Delaney, Danelle M. Larson
wiley +1 more source
, 2008 Crack propagation is one of the key issues for simulating nonlinear behavior and evaluating safety of concrete structures. The equivalent crack opening displacement of smeared damage-fracture model is formulated with damage parameter and crack band width.
Long, Y, Zhang, C, Zhou, Y
core
薄膜与基体间的界面滑移破坏 Failure Analysis on Interfacial Slipping in a Film/Substrate Structure
, 2013 薄膜/基体结构是常用于柔性电子与热障涂层的一种基本结构。就这种结构而言，当薄膜非常薄的时候，实验研究中会发现其界面破坏模式与宏观尺度下的情况具有显著不同，即出现了一种新的界面破坏模式，滑移破坏。本文针对试验现象建立了界面滑移破坏模型，得到能量释放率、应力强度因子。对试验现象进行分析，与实验数据进行比较，并在此基础上研究了能量释放率、应力强度因子等随薄膜基体厚度比的变化关系。理论分析结果可以较好解释实验现象，从而用于指导柔性电子器件的结构设计。 As far as the basic structure ...
戴隆超, 龚俊杰, 顾乡
semanticscholar +1 more source
Experimentally testing animal responses to prescribed fire size and severity
Conservation Biology, Volume 38, Issue 3, June 2024.Abstract Deserts are often highly biodiverse and provide important habitats for many threatened species. Fire is a dominant disturbance in deserts, and prescribed burning is increasingly being used by conservation managers and Indigenous peoples to mitigate the damaging effects of climate change, invasive plants, and land‐use change. The size, severity,
Tim S. Doherty +4 more
wiley +1 more source
Research progress of support theory and technology of the roadway surrounding rock based on the plastic zone control [PDF]
With the increasing depth of coal mining, the stability control of surrounding rock in deep roadway has become one of major problems in the mining field, and the effect of surrounding rock control in deep roadway is directly related to the safe ...
Lei FAN +3 more
core +1 more source