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三峡工程中陡高边坡的分层开挖模型
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作者 韩西安 吴钰飞 +1 位作者 李怡勇 邱铭铭 《装备指挥技术学院学报》 2003年第1期99-102,共4页
研究了三峡大坝陡高边坡的开挖方案及坡面稳定性问题;通过对陡高边坡简化模型的分析,运用刚体平衡法、Bishop法对滑体进行受力分析,完成最危险滑动面的搜索,计算了相应的安全系数,构建了均匀岩体边坡的优化开挖模型,并对开挖坡角进行了... 研究了三峡大坝陡高边坡的开挖方案及坡面稳定性问题;通过对陡高边坡简化模型的分析,运用刚体平衡法、Bishop法对滑体进行受力分析,完成最危险滑动面的搜索,计算了相应的安全系数,构建了均匀岩体边坡的优化开挖模型,并对开挖坡角进行了优化;结合三峡工程的实际背景,进一步考虑了岩体风化的分层,提出了陡高边坡的分层开挖模型,给出了各层最优开挖角及安全系数的计算公式,得到了边坡的整体开挖方案;数值结果表明:陡高边坡的分层开挖模型是较均匀的开挖模型,稳定性增加,结果更符合工程实际. 展开更多
关键词 三峡工程 陡高边坡 分层开挖 数学模型 风化分层
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Spontaneous pineal apoplexy in a pineal parenchymal tumor of intermediate differentiation
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作者 Ching-Chun Wang Jennifer Turner Timothy Steel 《Cancer Biology & Medicine》 SCIE CAS CSCD 2013年第1期43-46,共4页
Pineal apoplexy is a rare clinical presentation of pineal parenchymal tumors. We report the curative treatment of a case of pineal parenchymal tumor of intermediate differentiation with spontaneous apoplectic hemorrha... Pineal apoplexy is a rare clinical presentation of pineal parenchymal tumors. We report the curative treatment of a case of pineal parenchymal tumor of intermediate differentiation with spontaneous apoplectic hemorrhage. This case is shown through computed tomography and magnetic resonance imaging of the brain, and is confirmed via histopathological studies. Recurrent upward gaze paresis was observed after the stereotactic biopsy. The paresis required an expeditious tumor resection. The mechanism of the pineal apoplectic hemorrhage remains unclear although it has been observed in different pineal region lesions. Clinical and radiological evidence of the cure 5 years post-surgery is available. 展开更多
关键词 APOPLEXY pineal parenchymal tumor obstructive hydrocephalus pineal gland Parinaud's syndrome
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