共搜索到8217条信息,每页显示10条信息,共822页。用时:0小时0分0秒281毫秒
clay using a hollow cylinder apparatus in undrained condition. The direction of the strain increment induced by the principal stress rotation as well as the influence factors were studied in particular. The results show that the obvious deviation between the directions of principal strain increment (non-coaxial) and principal stress is observed in the three series of stress rotation path tests......
......
......
......
. The unified shear strength formulation for unsaturated soils under the plane strain condition is adopted to characterize the intermediate principal stress effect, and strength nonlinearity is described... on the unsaturated soil strength [4-6]. The plane strain condition is a true three-dimensional stress state, where the intermediate principal stress acts in the longitudinal direction and does not equal......
主成分分析法综合评价我国13个大气腐蚀站点的气候因素 李晓刚1,赵泉林1,董超芳1,贾志军1 (1.北京科技大学腐蚀与防护中心,北京,100083) 摘要:应用主成分分析法对我国13个大气腐蚀试验站点的气候因素的相关性进行了分析,并且根据各站点的主成分得分,得出各试验站的主要气候影响指标并对气候环境综合归类.并与我国的主要气候类型分类进行对比,证明对我国13个大气腐蚀试验站点按气候因素分类的正确性,验证各站点选址的气候典型,涵盖我国主要气候类型.可以依据上述各站点的主要自然环境影响因素指导环境试验,研究不同环境因素对材料性能的影响. 关键词:主成分分析; 气候; 相关系数; 综合评价; principal component analysis; weathering; correlation matrix; evaluation; [全文内容正在添加中] ......
leads to the randomness of the selected strength, and affects the pavement structure design. Tensile strain is the main factor leading to the failure of asphalt mixture. Taking principal tensile...; strength characteristics; principal tensile strain; failure criterion 沥青混合料因具有抗滑,耐磨,柔韧,可再生利用,施工与养护维修方便,开放交通快等特点被广泛用作现代公路的路面材料[1].至2015年底,我国已建成通车的高速公路突破了12.35万km,居世界第1位,其中90%以上为沥青路面.但从近年来已投入运营的沥青路面使用状......
strain conditions. The rock mass is assumed to be elastic-perfectly plastic and governed by the unified strength theory (UST). Different major principal stresses in different engineering situations... of rock masses. In addition, parametric study is conducted to investigate the effect of intermediate principal stress. The result shows the major principal stress should be rationally chosen according......
Real-time lane departure warning system based on principal component analysis of grayscale distribution and risk evaluation modelZHANG Wei-wei(张伟伟), SONG Xiao-lin(宋晓琳), ZHANG Gui-xiang(张桂香) (State... information, lane boundaries were detected based on principal component analysis of grayscale distribution in search bars of given number and then each search bar was tracked using Kalman filter between......
on the sliding and climbing of dislocations, thus we propose a limiting strain energy strength theory (LSEST). Equivalent stresses of the LSEST under various principal stress states are evaluated...; (2) Maximum principal strain theory (Saint-Venant)[4] assumes that failure occurs......