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Li Dongliang Cao Linjian Zhou Zhanhang Zhao Kuokuo Du Zhinian Han Kaiqiang 《Environmental science and pollution research international》2022,29(54):81636-81657
Environmental Science and Pollution Research - The coordination relationship between new-type urbanization and urban low-carbon development under the goal of carbon neutrality has become a hot... 相似文献
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降雨入渗是引起内河航道岸坡失稳的重要因素。目前降雨入渗条件下岸坡稳定性数值分析中,关于岸坡竖向剖面的饱和度与孔压分布规律,主要针对不同的雨型分布开展研究,而不同的降雨强度、降雨历时和土体饱和渗透系数也会显著影响饱和度与孔压随深度的分布,从而影响岸坡的稳定性;降雨作用下的许多岸坡失稳现象发生在降雨停止后的某一时刻,目前鲜见针对降雨作用停止后岸坡稳定性变化规律的数值模拟研究;当降雨强度与岸坡土体饱和渗透系数较为接近时,对岸坡的稳定性最为不利,已有研究中没有结合降雨强度考虑土体饱和渗透系数变化对岸坡稳定性的影响。基于此,通过建立ABAQUS有限元数值模型,分析降雨作用对岸坡饱和度、孔隙水压力、位移变形和安全系数的影响。结果表明:降雨入渗会使岸坡浅层土体的饱和度与孔压急剧升高;雨水渗流及基质吸力会使岸坡土体产生变形,强降雨会使浅层土体发生严重塑性破坏;降雨强度一定时,随着降雨时长增加,岸坡稳定性降低,土体渗透系数较小时,岸坡安全系数最小值出现在降雨结束后某一时刻;土体渗透系数对于岸坡稳定性的影响需同降雨强度结合起来考虑。 相似文献
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Shigang Yang Qin Fang Yadong Zhang Hao Wu Linjian Ma 《Journal of Loss Prevention in the Process Industries》2013,26(1):74-81
It is very important and necessary to perform quantitative hazard analysis for possible accidental leakage from an underground gas storage cavern in salt rock. An integrated quantitative hazard analysis method for natural gas jet release from salt caverns is presented in this paper, which was constituted by a revised model for gas leakage rate calculation, a consequence analysis and a model of probability assessment for harm. The presented method was validated by comparing the analytical results with the data collected from the real accidents (including the leakage, jet fire, fireball and vapor cloud explosion). It is indicated that the proposed method was more accurate than the TNT equivalence method for vapor cloud explosion and gave more reasonable results when applied to the consequence analysis for the thermal radiation from jet fire and fireball. 相似文献
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