抗承压水基坑底板的厚度分析与计算-工程力学-清华大学.PDFVIP

第21 卷第2 期 工 程 力 学 Vol.21 No. 2 2004 年 4 月 ENGINEERING MECHANICS April 2004 文章编号：1000-4750(2004)02-0204-05 抗承压水基坑底板的厚度分析与计算 1 1 2 马石城 ，印长俊 ，邹银生 (1. 湘潭大学建筑工程系，湖南411105 ；2. 湖南大学土木工程学院，湖南 410082) 摘 要：通过对抗承压水基坑底板的破坏机理分析，提出了一种基坑底板临界厚度的计算方法，该方法概念明晰， 计算简单。实例计算表明：在5 个工程实例中，传统的计算方法所得结果只有20%与实际情况相符；本方法所得 结果与工程实际的相符程度达80%，考虑了除基坑开挖深度外的所有基坑平面尺寸的影响，能真实地反映基坑抗 突涌的稳定性。 关键词：基坑开挖；承压水；隔水土层；临界厚度 中图分类号：TU470 文献标识码：A ANALYSIS AND CALCULATION OF THE PIT BASE PLATE THICKNESS OF BEARING RESISTANCE WATER FOUNDATION 1 1 2 MA Shi-cheng , YIN Chang-jun , ZOU Yin-sheng (1. Department of Architectural Engineering, Xiangtan University, Hunan 411105, China; 2. Institute of Civil Engineering, Hunan University, Hunan 410082, China) Abstract: Based on the failure mechanism of bearing resistance water foundation pit base plate, a method for calculation of critical pit base plate thickness of foundation is proposed. It is conceptually simple and easy to be implemented. It considers the influence of all foundation pit plane dimensions except the depth of foundation pit excavation. Therefore, it can reflect truly the stability of sudden gush resistance of foundation pit. Results show that among the five engineering examples, the results gained by the present method conform with the real conditions to 80%, contrasting with the 20% agreement achieved using the traditional method. Key words: foundation pit excavation; bearing water; clay pan; critical thickness 1 引言 统的方法是按压力平衡的方