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, 2009, 34(l): 53-57. LIN Hang, CAO Ping, LI Jiangteng, et al. The thickness reduction method in forecasting the critical safety roof thickness of gob area[J]. Journal of China Coal Society, 2009, 34(l... in Hunan Province. The results show that the prediction results obtained by the prediction formulas agree well with the numerical results, and the prediction formulas for calculating the safety floor......
. Therefore, the mountainous area could be divided into two parts by ridge lines: one part where the sliding mass might cause risks to the traffic safety and the other part where the sliding mass would... can be recognized. As Fig. 16 shows, with the prolonging of heavy rainfall, the stability situation of the study area becomes worse. Safety factor reduces gradually and final potential sliding area......
show that under strong rainfall conditions, the seepage gradient of embankment slope in X direction is positive on the surface of the slope and at the foot of the second grade slope. The positive area... to form a plastic penetrating zone. Influenced by the seepage force, the evolution law of slope safety factor is divided into 4 stages, i.e. slow rising stage, slow decline stage, rapid descent stage......
surface affected by rainfall infiltration loses (even becomes positive) and volume water content increases, and then gradually decreases after rainfall. During the rainfall, the safety factor of embankment slope gradually decreases. The plastic zone extends upward along the foot of slope with the groundwater level, and the area of plastic zone increases. With the combined actions of the recovery......
Preparation of High-Surface Area Nano-CeO2 by Template-Assisted Precipitation Method He Mai1,Luo Mengfei1,Wang Yuejuan1,Fang Ping1,Ma Jingmeng1 (1.Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua 321004, China) Abstract:The high-surface area nano-CeO2 was prepared by Ce(NO3)3 by precipitation method......
the safety factor and instability process of cohesive soil slope, the discrete element method(DEM) was applied. DEM software PFC2D was used to simulate the triaxial test to study the influence... by strength reduction and gravity increase method, it is shown that the safety factor obtained by strength reduction method is more conservative, and the arc-shaped feature of the sliding surface under......
科学也随之处于国际前列.由国际劳工局主编的<职业健康与安全百科全书>(第四版)[1],不仅涵盖了职业卫生与安全领域的各个学科,也系统地介绍世界各国在职业卫生与安全方面的工作方法,有效措施以及管理模式.2010年,SWUSTE等[2-3]在国际刊物Safety Science发表了两篇比较系统的综述文章,对20世纪以来近百年美国,英国和荷兰职业安全的标志性成果和安全科学理论等进行了评述,也充分说明了...系的对应关系[6] Table 1 System of five types of safety science principles and regulations[6] 5) 安全系统科学原理.安全系统是灾害和事故发生的场所,是安全管理的对象,安全系统思想是安全科学的核心思想,安全系统科学是安全科学学科的主体.安全系统的构成要素包括人,机,环境,信息,管理等,因此,可以将安全系统......
rate is affected by longitudinal air velocity and chimney effect, smoke spread rate is small in the upstream area of combustion source, backflow distance is shorter than calculated by the empirical... on the top area of the metro tunnel obeys exponential decay laws, and further correction can be added to Kurioka model when the sectional shape factor of tunnel is less than 1. In case of a fire......
Role of street patterns in zone-based traffic safety analysisGUO Qiang(郭强)1, PEI Xin(裴欣)1, 2, YAO Dan-ya(姚丹亚)1, 2, WONG Sze-chun(黄仕进)3(1. Department of Automation, Tsinghua University, Beijing 100084... and severity of crashes, the explicit relationship between street pattern characteristics and traffic safety remains underexplored. Based on a zone-based Hong Kong database, the Space Syntax was used......
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