日本政府数字经济政策评析——基于“数字破坏效应”视角

数字经济政策是日本政府的施政关键点之一,其数字经济战略的核心是构筑日本的经济塑造力、行政主导力、社会问题解决力,并显著提升其数字竞争力。数字经济繁荣所带来的“数字破坏效应”,可以释放日本的经济发展潜能,助力改革僵化的行政制度体系,化解因少子老龄化、地区发展差距等问题产生的社会矛盾,提升日本的数字竞争力与规则制定能力。日本政府的数字经济政策也存在着执政任期限制、国内经济发展趋向及地缘安全影响等挑战因素。对中国而言,日本政府数字经济政策有一定的借鉴意义。

数字经济的IPE逻辑——基于国家安全结构权力视角

数字经济对促进经济增长、推动数字化转型等方面集中表现在“数字破坏效应”所诱发的传导机制。数字技术成为影响国家安全结构的基本点,是一国国际竞争力的核心要素之一,影响着国家安全结构与国际政治经济互动关系。国家力量对比愈发取决于对数字化能力的掌握程度。疫情使得全球经济复苏形势依然严峻,社会动荡不断,各国生产生活的恢复进程不确定性放大。鉴于以上原因,中美欧等经济体纷纷加大对数字产业的支持,全球数字化进程愈发凸显,全球数字经济版图逐渐呈现出中美两极化的特点。随着全球数字经济潜力的进一步释放,世界政治经济格局也将持续复杂演变和能力分化,数字经济愈发成为一国科技进步与国际竞争力的关键支撑点。对此,要把握好数字化机遇,努力攻破制约经济社会发展的技术创新难题,实现中国国际数字竞争力的再跃升。

Effect of heterogeneity on occurrence of zonal disintegration around deep underground openings

By utilizing the two numerical codes RFPA3 D and FLAC3 D, the effect of heterogeneity on failure mode and failure mechanism of rock around deep underground excavations under tri-axial stress is analyzed. It is found that zonal disintegration is a large scale shear-slip failure developed in deep surrounding rock mass under tri-axial stress, which is accompanied by a large amount of tensile failure. The distance between fractures and the number of fractures have a close correlation with the rock mass heterogeneity. With an increase of the homogeneity index of the rock mass, the distances between fractures decrease and the number of fractures increases. For an intact hard rock mass with relative high homogeneity, only failure mode characterized as v-shaped notches can be formed due to the intersection of intensively developed shear bands. None of the zonal disintegration can be formed due to the fact that with increasing homogeneity, the failure mechanism of rock mass is gradually dominated by shear failure rather than tensile failure.

Deformation tests and failure process analysis of an anchorage structure

In order to study the failure process of an anchorage structure and the evolution law of the body＇s defor- mation field, anchor push-out tests were carried out based on digital speckle correlation methods （DSCM）. The stress distribution of the anchorage interface was investigated using the particle flow numerical simulation method. The results indicate that there are three stages in the deformation and fail- ure process of an anchorage structure： elastic bonding stage, a de-bonding stage and a failure stage. The stress distribution in the interface controls the stability of the structure. In the elastic bonding stage, the shear stress peak point of the interface is close to the loading end, and the displacement field gradually develops into a ＂V＂ shape, in the de-bonding stage, there is a shear stress plateau in the center of the anchorage section, and shear strain localization begins to form in the deformation field. In the failure stage, the bonding of the interface fails rapidly and the shear stress peak point moves to the anchorage free end. The anchorage structure moves integrally along the macro-cracl~ The de-bonding stage is a research focus in the deformation and failure process of an anchorage structure, and plays an important guiding role in roadway support design and prediction of the stability of the surrounding rock.