大面积多层地下空间侧墙早期应力分析及抗裂抗渗技术  

The Sidewall Early Stress Simulation Analysis and Anti-Crack and Anti-Seep Technology in Large-Scale Multi-Storey Underground Space

作　　者：欧阳东[1] 易宁[1,2] 萧澎伟[1] 李晓铭[1] 潘攀[1] 鲁刘磊[1] 宁博[1] 易承波[1] 

机构地区：[1]暨南大学"重大工程灾害与控制"教育部重点实验室,广东广州510632 [2]广东省建筑科学研究院,广东广州510500

出　　处：《沈阳建筑大学学报（自然科学版）》2010年第4期618-623,共6页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家星火计划项目(2005EA780018);爆炸科学与技术国家重点实验室开放基金项目

摘　　要：目的深入剖析超高层建筑中大面积多层地下空间侧墙早期裂缝产生与发展的机理,并据此探讨地下空间侧墙早期抗裂抗渗技术.方法对工程模型进行了基于ANSYS的水化热温度—应力有限元仿真分析,并分析纤维混凝土材料、聚乙烯气垫薄膜覆盖作保温保湿养护的抗裂抗渗原理.在-4到-1层地下空间侧墙工程中应用聚丙烯纤维混凝土以及聚乙烯气垫薄膜覆盖作保温保湿养护.结果 C35混凝土中添加0.9kg/m3的聚丙烯纤维,提高了侧墙的抗裂抗渗性能,保温养护14d降低了内表温差,提高了墙体抵御寒潮的能力.这些措施的实施使得最大拉应力由1.42MPa减少为0.82MPa,并且始终小于容许拉应力.结论大面积多层地下空间工程对抗裂抗渗性能要求极高,混凝土水化热及环境温度突变是导致其开裂的主要原因.纤维混凝土及保温保湿措施的采用,在大面积多层地下空间结构抗裂抗渗方面取得了满意的效果.This paper analyses the mechanism of production and development of the early cracks of the large multi-storey underground space side wall of high-rise building and with that investigates the anti-crack and anti-seep technology of the underground space side wall. Finite element analysis based on the temperature of hydration heat-stress of ANSYS is carried out and analyses the anti-crack and impervious principle of fiber concrete material and polyethalene air-cushion film used for the curing materials thermal insulation and moisturizing. Both polypropylene fiber concrete and polyethalene air-cushion film as thermal insulation and moisturizing curing materials are used at the underground space side wall project of-4 to-1 layer. The results showed that incorporating polypropylene fiber with 0. 9 kg/m^3 into C35 concrete improved the anti-crackand anti-seep performance and reduced temperature difference between inside and outslae after insulated curing in 14d and improving the capacity of the wall to resist cold. Implementation of these measures makes the maximum tensile stress reduce from 1.42 MPa to 0. 82 MPa, and always less than the allowable tensile stress. Large multi-storey underground space engineering-requirements on the anti-crack and anti-seep performance is very high. Hydration heat and the ambient temperature of mutation are the main reasons leading to concrete crack. Taking fiber concrete and thermal insulation measures, in the field of the anti-crack and anti-seep of the large multi-storey underground structure, could gain satisfactory results.

关 键 词：大面积地下空间 早期裂缝 有限元 纤维混凝土 保温养护 抗裂抗渗 

分 类 号：TU745.3[建筑科学—建筑技术科学]