Intact soft clay’s critical response to dynamic stress paths on different combinations of principal stress orientation

Comprehensive tests on Hangzhou intact soft clay were performed, which were used to obtain the soils’ critical response to undrained dynamic stress paths under different combinations of principal stress orientation. The different combinations included cyclic principal stress rotation (CPSR for short), cyclic shear with abrupt change of principal stress orientation (CAPSO for short) and cyclic shear with fixed principal stress orientation (CFPSO for short). On one side, under all these stress paths, samples have obvious strain inflection points and shear bands, and the excess pore water pressure is far from the level of initial effective confining pressure at failure. Stress paths of major principal stress orientation (α) alternating from negative and positive have quite different influence on soil’s properties with those in which α is kept negative or positive. On the other side, due to the soil’s strongly initial anisotropy, samples under double-amplitudes CPSR and CAPSO (or single-amplitude CPSR and CFPSO) have similar properties on dynamic shear strength and pore water pressure development tendency when α is kept within ±45°, while have quite different properties when α oversteps ±45°.     

解读连战先生的民族情

文章试图从两方面解读连战先生深厚的民族情.这种民族情一方面来源于他的家族,连战的先祖到台湾死也不臣服清,曾祖父至父亲三代以各种形式坚持抗日及父母对他言传身教;另一方面与他早年在祖国大陆的生活经历有关,从他对抗战和日本的态度及祖国大陆寻踪等方面体现出来.     

Evaluation of ultimate bearing capacity of Y-shaped vibro-pile

Based on Mindlin stress solution, a numerical computational method was proposed to calculate the stresses in the ground induced by side friction and the resistance of Y-shaped vibro-pile. The improved Terzaghi’s and ЪерезанцевВГ’s methods for ultimate bearing capacity evaluation were proposed by considering the stress strength induced by friction resistance at pile head level of Y-pile. A new method to calculate the ultimate bearing capacity of Y-pile was also proposed based on the assumptions of soil failure mode at the tip of Y-pile and the use of Mohr-Coulomb soil yield criterion and Vesic compressive correction coefficient with the induced stresses in the ground. Based on the comparisons with the field static load test results, it is found that the improved Terzaghi’s method gives higher ultimate capacity, while the other two methods shows good agreement with the field results.     

Adhesion coefficient of automobile tire and road surface

The adhesion coefficient of automobile tire and road surface was analyzed and the formula about it was derived.Some suggestions about highway construction,driving safety of the drivers and the judgment of the traffic accidents were presented.The results show that the adhesion coefficient is a function with the extreme value.If there is atmospheric pressure in the tire,the load of the vehicle and the degree of the coarse on the road surface is not selected properly,it will reach the least and affect the safety of the running automobile.     

Effects of stress conditions on rheological properties of granular soil in large triaxial rheology laboratory tests

In order to study the rheological properties of red stone granular soil,a series of rheological experiments were executed on large tri-axial rheological apparatus.Under 100,200 and 300 kPa confining stress conditions,the rheological tests were carried out.These experiment results showed that the stress conditions,especially the stress level were the critical influencing factors of the rheological deformation properties.Under the low stress level(S=0.1),the granular soil showed the elastic properties,and there was no obvious rheological deformation.Under the middle stress level(0.20.8) creep curves showed the non-linear viscous plastic rheological properties.Especially,under the stress level of S=1.0,the accelerated rheological phase of creep curves occurred at early time with a trend of failure.The stress level had obvious effects on the final rheological deformation of the soil sample,and the final rheological deformation increments nonlinearly increased with stress level.The final rheological deformation increment and step was little under low stress level,while it became large under high stress level,which showed the nonlinearly rheological properties of the granular soil.The confining pressure also had direct effects on final rheological deformation,and the final rheological deformation linearly increased with confining pressure increments.     

2008年我国房地产业的发展模式与市场把握

在深入市场调查、认真采集数据和科学分析研究的基础上,从我国新一年房地产业发展的"背景和环境"、"预期和责任"、"风险和影响"、"保障和创新"等方面进行阐述和论证.     

窃取商业秘密获得的专利权归商业秘密权利人所有——兼谈商业秘密构成要件和范围

中国加入WTO以后,知识产权的保护意识日益强化,作为知识产权范畴的专利权更是被人们普遍关注和重视.以"错案"为研究对象,运用商业秘密的有关理论以及保护商业秘密和专利权的有关法律制度,特别是从窃取商业秘密获得的专利权归谁所有的角度,对人民法院的判决进行了分析研究,指出了人民法院的判决是错误的,提出了窃取商业秘密获得的专利权归商业秘密权利人所有.这有利于人民法院公正司法,依法审判.     

从语气助词的角度浅析日语表达方式的特性

日语中有着十分丰富的语气助词,其虽然不具有实际的意义,然而通过语气助词,却能够流露出说话者的心情和感受,传递出不溢于言表的隐性含义,在日常的表达中扮演着十分重要的角色.从语气助词的角度,分析总结日语在表达上所具有的特性.     

Additional water use influencing strength and fluidity of recycled concrete

Through adding different additional water use,the compressive strength,splitting tensile strength and fluidity of recycled concrete of three aggregate combination forms were studied by experiment respectively.The experimental results show that with the increase of adding additional water use,the compressive strength and splitting tensile strength of recycled coarse aggregate concrete decrease,but that of recycled fine aggregate concrete and recycled all aggregate concrete increase firstly then decrease.When additional water use is added more 15% or 20% than that of basic ordinary concrete,the recycled coarse aggregate concrete and fine one can get pretty good fluidity.When it is added more 30%,the recycled all aggregate concrete has fluidity that is just satisfied.     

情趣与意象的契合——《逢雪宿芙蓉山主人》与《雪夜林边驻脚》之比较

通过分析《逢雪宿芙蓉山主人》与《雪夜林边驻脚》两诗的情趣和意象,发现两诗都采用了大致相似的意象.但由于诗人各自的文化传统的差异,在两诗中所传达的情趣却不同.然而,正是由于两诗各自在情趣与意象上的契合,才创造出了各自完美的诗境.     

开封电视塔变形观测

本以开封电视塔变形观测为例,阐述了高大构筑物变形观测的布网原则、实测及数据处理与分析的理论方法。     

全站仪进行高程测量精度研究

通过选择一条高程路线,分别采用单向观测、对向观测和水准式观测3种方法用全站仪进行观测,分析比较得出精度最高的观测方法及其观测条件,相关研究结果可为现场生产测量实践提供有效参考借鉴.     

测量参数估计中的观测值应用问题

本文将观测值区分为直接观测值和间接观测值,用最小二乘理论,讨论了两者在测量参数估计中的关系,得出了一些有意义的结论。     

广西某大桥变形观测方法研究

桥梁变形观测的目的是为桥梁在运行阶段提供维护和安全运行的可靠数据。论述了某大桥桥面沉降观测、桥墩水平变形观测的精度设计及测量方法,同时对大桥变形规律性进行了分析,从大桥桥面沉降观测数据的分析说明,大桥变形处于安全范围。并提出了今后应该注意的事项。     

全站仪中间法与对向观测法精度分析

介绍了全站仪对向观测与中间观测基本原理,并基于其原理推导出两种观测方法的高程测量公式.经误差传播定律推出中误差公式,通过误差数据定量分析比较两种方法的精度,得出在测距、竖直角变化时对向观测与中间观测的精度是不相同的,并用实例进行了对比验证,在实际应用中,应结合精度分析结果选择合理的测量方法以提高精度.     

全站仪三轴补偿系统与测角精度实验研究

目的通过三轴补偿全站仪与双轴补偿全站仪的测角精度的实测实验,探讨全站仪的三轴自动补偿的性能和适用情况.方法选用日本PENTAX公司的ATS-102型三轴补偿全站仪与双轴补偿全站仪,在有振动的实验区进行角度测量实验,采用全圆观测法进行测量,观测值经Chenvenet准则剔除粗差后,采用巴特莱法检验其测角精度.结果在视线倾角小于3°的情况下,所有各型仪器均可用半测回代替一个测回;但在视线倾角大于3°的情况下,三轴补偿系统全站仪仍可用半测回代替一个测回,且三轴补偿系统的全站仪观测值的稳定性也较好.结论ATS-102三轴补偿全站仪（即使在倾角超过3°的方向上）能实现包括视准轴在内的三轴自动补偿.三轴补偿系统全站仪存在的问题是抗恶劣气象条件较差,如在震源附近,风大等条件下,水平角发生变化,因此三轴补偿系统全站仪适合在精度要求较高的环境中使用.     

对建筑工程沉降观测的研究

将对建筑工程沉降观测点的布设、沉降观测方法、观测周期的安排等问题进行分析研究.     

建筑物沉降观测的技术研究

对建筑物的沉降观测进行了探讨,目的在于使建筑物的沉降观测更加真实地反映建筑物的沉降数据.     

全站仪三角高程测量及其精度分析

全站仪三角高程测量可以代替水准测量进行高程控制,主要有对向观测法和中间观测法。在这两种方法中,前者将大气折光系数作为常数考虑,认为各个方向的折光系数相同,这与实际的情况有出入。而中间观测法则将大气折光系数作为变量处理,并加以改正。本文详细介绍了这两种方法的具体实施过程,并对其精度进行了分析。     

电阻率多极距观测台站的电性结构模型及参数反演研究——以山丹台为例

电阻率多极距观测系统相对于目前地震监测中普遍使用的单极距观测系统是一个进步.利用电阻率多极距观测数据,经正、反演计算后可获得不同深度层的等效(真)电阻率值,可有效地排除因人类活动等引起的表浅层干扰,从而获得可靠性高的电阻率异常.不过,在获得等效(真)电阻率之前,须获得台站的电性结构模型,而前人未对此进行详细研究.因此本...