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非饱和土与特殊土力学的基本理论研究 被引量:159
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作者 陈正汉 《岩土工程学报》 EI CAS CSCD 北大核心 2014年第2期201-272,共72页
对非饱和土与特殊土开展了持久深入的研究,取得了系统的创造性成果:在国内率先研制成非饱和土固结仪、直剪仪、渗气仪、标准三轴仪、温控三轴仪、多功能三轴仪和土工CT–三轴仪等一系列仪器设备,揭示了非饱和土与特殊土的水气运动规律... 对非饱和土与特殊土开展了持久深入的研究,取得了系统的创造性成果:在国内率先研制成非饱和土固结仪、直剪仪、渗气仪、标准三轴仪、温控三轴仪、多功能三轴仪和土工CT–三轴仪等一系列仪器设备,揭示了非饱和土与特殊土的水气运动规律及变形、强度、屈服、水量变化、湿陷、湿胀、细观结构演化、温度效应等许多重要力学特性规律;构建了岩土力学的公理化理论体系与多种组合形式的非饱和土的应力状态变量;提出了各向异性多孔介质的有效应力理论公式与非饱和土的有效应力理论公式;建立了非饱和土、湿陷性黄土和膨胀土的本构模型谱系(包括非线性、弹塑性、结构性损伤与热力耦合模型)与分别考虑密度、净平均应力和偏应力影响的广义土–水特征曲线模型谱系;创立了非饱和土三维固结理论及其固结模型谱系;自主研发了分析固结问题的系列软件,求得一维固结问题的解析解和二维固结问题的数值解,形成了完整的理论体系。应用研究成果解决了多项工程的疑难问题,表明所建理论能够指导实践,为工程决策提供理论支持和科学依据。 展开更多
关键词 非饱和土 特殊土 公理化体系 应力理论 固结理论 本构模型 广义土-水特征曲线模型
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What Can Artificial Intelligence Learn from Wittgenstein's On Certainty?.
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作者 XU Yingjin 《Frontiers of Philosophy in China》 2014年第3期441-462,共22页
Meta-philosophically speaking, the philosophy of artificial intelligence (AI) is intended not only to explore the theoretical possibility of building "thinking machines," but also to reveal philosophical implicati... Meta-philosophically speaking, the philosophy of artificial intelligence (AI) is intended not only to explore the theoretical possibility of building "thinking machines," but also to reveal philosophical implications of specific AI approaches. Wittgenstein's comments on the analytic/empirical dichotomy may offer inspirations for AI in the second sense. According to his "river metaphor" in On Certainty, the analytic/empirical boundary should be delimited in a way sensitive to specific contexts of practical reasoning. His proposal seems to suggest that any cognitive modeling project needs to render the system context-sensitive by avoiding representing large amounts of truisms in its cognitive processes, otherwise neither representational compactness nor computational efficiency can be achieved. In this article, different AI approaches (like the Common Sense Law of Inertia approach, the Bayesian approach and the connectionist approach) will be critically evaluated under the afore-mentioned Wittgensteinian criteria, followed by the author's own constructive suggestion on what AI needs to try to do in the near future. 展开更多
关键词 analytic/empirical dichotomy artificial intelligence context axiomaticsystem CONNECTIONISM Bayesian network
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