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黄土挖填方场地中桩筏基础受力变形状态研究 被引量:2
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作者 段旭 董琪 +2 位作者 门玉明 叶万军 李秉书 《西安建筑科技大学学报(自然科学版)》 CSCD 北大核心 2018年第3期373-380,共8页
利用自制模型箱,以延安新区黄土挖填方场地中的桩筏基础为原型,开展了相似比为1∶5的模型试验.通过上部加载模拟上部结构荷载,对桩体纵筋、筏板表面的应变数据以及桩间土体的土压力数据进行采集分析.试验结果表明,随着上部荷载的增大,... 利用自制模型箱,以延安新区黄土挖填方场地中的桩筏基础为原型,开展了相似比为1∶5的模型试验.通过上部加载模拟上部结构荷载,对桩体纵筋、筏板表面的应变数据以及桩间土体的土压力数据进行采集分析.试验结果表明,随着上部荷载的增大,地基的不均匀沉降导致了基础产生向填方区的偏转,桩体发生明显的弯曲变形,不同部位桩体的应力集中位置以及桩-土相互作用状态有明显区别.在模型试验的基础上探讨了挖填结合地基上桩-土-筏共同作用的计算式.基础设计时应避免桩体全段位于填方地基中,基桩底部应深入稳定原始土体,并通过对填方地基的预处理提高桩周土体的摩擦力,同时应考虑各桩轴向应变数值以及峰值位置的差异,有针对性地考虑桩体的承载能力. 展开更多
关键词 黄土挖填方场地 桩筏基础 模型试验 不均匀沉降
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The Role of Relationships with Teachers in Adolescent Development among a National Sample of Chinese Urban Adolescents 被引量:11
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作者 dongqi CHENChuan-sheng 《应用心理学》 CSSCI 2001年第2期3-10,共8页
A nationally representative sample of 1640 Chinese urban adolescents (mean age=14.5 years) and their parents and teachers were surveyed to examine the associations between relationships with teachers and parents and a... A nationally representative sample of 1640 Chinese urban adolescents (mean age=14.5 years) and their parents and teachers were surveyed to examine the associations between relationships with teachers and parents and adolescents' developmental outcomes such as academic performance, psychological well-being, altruistic behaviors, and misconduct. Results showed that the quality of adolescents' relationships with teachers was highly correlated with adolescent outcomes, in most cases more so than for relationships with parents. Furthermore, such associations were the same across both genders and three grade levels. These findings suggest that teachers may play an especially significant role in Chinese adolescent development. This study adds to the small but growing literature on the importance of teachers as well as other non-parental adults in adolescent psychosocial development. 展开更多
关键词 teacher-student RELATIONSHIPS ADOLESCENT development CHINESE adolescents
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