长沙国际金融中心软岩载荷试验及其成果分析

长沙国际金融中心是目前华中在建第一高楼,建筑高度452 m,地上93层,地下5层,基础埋深约40 m。场地第四系覆盖层厚度约20 m,基岩为白垩系泥质粉砂岩,属极软岩。按现行(GB50007—2011)《建筑地基基础设计规范》确定的地基承载力远低于原位试验。文章采用承压板直径分别为φ800 mm、φ1130 mm的静力载荷试验与室内单轴抗压试验进行对比分析,提出了软岩承载力的试验取值原则,对同类地区类似岩基承载力的取值具有参考价值。

Experimental study on bearing capacity of soft rock of Changsha International Finance Centre

Changsha International Finance Center, the highest building under construction in Central China, is 452 meters high with structure of 93 ground layers and 5 underground layers and an embedded foundation depth of 42 meters. The rock in the building site 20 meters below the level is the Cretaceous argillaceous siltstone which is a kind of soft rock. The problem how to determine the characteristic values of subsoil bearing capacity of argillaceous siltstone is discussed by using the uniaxial compressive tests and loading tests with the diameter of 800 and 1130 mm. Through the tests and analyses, it is found that the bearing capacity evaluated by “Code for design of building foundation” (GB50007—2011) is quite lower than that from in-situ tests. In addition, the principles of determining the characteristic values of bearing capacity of soft rock iss put forward, which is deserved to be applied to practical problems such as those soft rocks.