摘要
为对巨厚(10m以上)人工堆填土地基处理时土层可能存在缺陷的影响进行评价,并采用三维有限元方法进行了数值模拟。以基底位移为影响结果,考虑以下几个因素:缺陷类型(位置、面积)、基础形式、荷载大小、垫层厚度。结果表明:筏板基础在基础形式中最优;缺陷面积相同时,缺陷分布越集中对垫层的危害越大;增加垫层厚度是有效的方法,但增大到一定值时效果有所下降,因此建议将改善垫层材料的整体性(强度、刚度)作为首要因素考虑。
To assess the influence of potential defect on giant thick artificial filled soil foundation, the numerical simulation was carried out by using finite element method. The cushion bottom displacement was chosen as influence result, then the following factors including defect types （position, area）, foundation form, load size and cushion thickness were considered. Results show that the raft foundation is the best in the all forms; the cushion get more unstable with additional concentration of the defect distribution. Although increasing cushion thickness is an effective method, the effect can reduced when the cushion thickness beyond a certain value. Therefore, authors suggest that the integrity （strength, stiffness） of cushion material can be considered as primary factor.
出处
《建筑科学与工程学报》
CAS
北大核心
2012年第4期120-126,共7页
Journal of Architecture and Civil Engineering
关键词
地基缺陷
灰土垫层
基础形式
筏板基础
大厚度填土
foundation defect
lime-soil cushion
foundation form
raft foundation
large thick ness fill soil
