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°.     

直击现代艺术之门——由决澜社的产生及影响谈其先锋性和局限性

20世纪30年代,向现代派艺术学习的从艺者成立了艺术团体决澜社,虽然它并没有如其发起者所预想的那样造成狂澜决堤之势,但终究为当时的画坛打开了一扇放眼世界的窗口,并且提出了"现代中国绘画艺术与现代世界艺术合流"的问题.是他们让人们意识到世界艺术日趋多元化的格局的到来.通过对其先锋性和局限性的思考让我们对于中国艺术的发展道路了解更加深入.     

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.     

GPS传感器网络助力洪水预警

在美国西南部和墨西哥西北部,雨季的降雨量占全年降雨量的一半以上,这些雨季降雨通常强度大且难以预测.在雨季到来的时候,来自加利福尼亚湾和墨西哥湾等海洋上的湿润气流经常会给太阳炙烤的土地带来暴雨的突袭.这种突发强降雨可能会冲毁道路,在短时间内诱发泥石流等自然灾害,不仅会对农业和生态系统造成重大影响,也严重威胁着人类的生命及财产安全.     

CH3CONH2/ZnCl2低共熔溶剂脱除模拟油中的硫化物

在110℃下,加热搅拌乙酰胺和氯化锌混合物制备了CH₃CONH₂/ZnCl₂低共熔溶剂,对其结构进行 了电喷雾电离质谱分析、红外分析和黏度分析。以CH₃CONH₂/ZnCl₂作为萃取剂和催化剂,H₂O₂作为氧化剂,氧 化脱除模拟油中的噻吩硫化物。对n(ZnCl₂)/n(CH₃CONH₂)、n(H₂O₂)/n(S)、反应温度、剂油体积比和不同硫化 物对脱硫率的影响进行了考察。在模拟油体积5mL、n(ZnCl₂)/n(CH₃CONH₂)=0. 4、n(H₂O₂)/n(S)=8、剂油体 积比1∶3、反应温度70℃、反应时间200min的最佳条件下,二苯并噻吩的脱除率达到87. 12%。经过5次循环之 后,脱硫率略有降低。     

从《劝学篇》看张之洞的立宪思想

一般论者认为,张之洞的<劝学篇>是反"民权"的;其核心创获--"中体西用"论中的"西用",仍停留在"西技西艺,,层面.本文通过分析<劝学篇>中张之洞对西方民权、立法、议院的理解,认为他反对"民权"却不反"立宪",并且对西方立宪制度中的"立法"与"议院"颇为认同,不无效仿之意;张之洞的"立宪"在于"保教",这大大限制了他对"西政"的吸收.尽管如此,<劝学篇>仍不失为张之洞立宪思想的首次表达之作.     

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.