某地下车库抗浮结构设计及其相关问题的探讨

Design of Anti-floating Structure of an Underground Garage and Simple Discussionof Its Related Problems

地下工程的结构抗浮设计条件较多,包括场地地质、周边水文、上部结构以及基础形式等,另外还需考虑工程的经济性、施工工期等各种因素,复杂的项目参考抗浮设防水位咨询报告进行抗浮设计比较合理;地下工程周边盲沟的设置,对结构抗浮设计相当有利,盲沟的减压作用随深度的加深,作用越明显;地下工程抗浮设计采用抗浮锚杆作为抗浮措施时,抗浮锚杆抗压刚度和抗拔刚度的大小,在某些情况下,对结构基础包括底板的抗浮设计会带来不利影响,需要针对相应的设计条件采用合适的刚度假定,保证相关结构设计计算的合理性;局部完全地下室的抗浮设计,不同位置的配重荷载,需要按相关规范要求采用相应的组合系数进行计算,确保结构使用安全。

There are many conditions for the structural anti-float design of underground engineering,including site geology,surrounding hydrology,superstructure and foundation form,etc.In addition,it is necessary to consider various factors such as the economy of the proj-ect,construction period and so on.It is more reasonable for complex projects to carry out anti-float design by referring to the advisory re-port of anti-float fortification and waterproof water level.The setting of blind ditch around underground engineering is quite beneficial to the anti-floating design of structure.The decompression effect of blind ditch becomes more and more obvious with the deepening of depth.When the anti-floating anchor is used as the anti-floating measure in the anti-floating design of underground engineering,the compressive stiffness and lifting stiffness of the anti-floating anchor will bring adverse effects on the anti-floating design of the structural foundation in-cluding the bottom plate in some cases.It is necessary to adopt appropriate stiffness assumption according to the corresponding design condi-tions to ensure the rationality of the relevant structural design calculation.The anti-floating design of partial complete basement and the coun-terweight load of different positions need to be calculated by corresponding combination coefficient according to relevant specifications to en-sure the safety of the structure.