摘要
介绍岩溶地区一高层建筑群采用天然地基上筏板基础设计的实践。该建筑群共7栋,楼高16层,其中1层地下室,基础底板置于标贯击数为9～11击的可塑粉质黏土层,土层以下为岩溶发育区,岩面高差达15m。原桩基方案实施困难较大,故考虑采用筏板基础。为合理确定地基承载力和计算沉降的变形参数,对其地基承载力采用原位压板荷载试验确定,较大于原地质报告提供的承载力。变形参数采用原位压板试验所确定的变形模量,变形模量为压缩模量的6倍。根据原位压板试验确定的强度和变形参数计算筏板基础下地基的承载力,并采用集中力弹簧模型计算筏板各点的沉降。同时筏板基础采用有限元等方法计算其内力和沉降,并进行设计。监测结果表明,实测沉降值与原计算值较一致。
A practice of a group of highrise buildings with raft foundation in karst region was introduced.There were 7 buildings in this group with 16 floors and one floor basement.The foundation was placed on a plastic silty clay layer whose beating counts of standard penetration test were 9–11.Under this layer was the karst region,and the altitude difference of rock surface reached to 15 m.It was more difficult to use the pile foundation than the raft foundation,so the latter was used.The bearing capacity of ground depends on the in-situ plate loading test,and it was found the in-situ results are larger than the values given in the report of geotechnical engineering exploration.The deformation moduli from the in-situ plate loading test were used to calculate the settlement,and they were 6 times of the compressing modulus.Based on the deformation modulus from the in-situ plate loading test,the settlement of each point on the raft foundation was calculated using spring model with concentrating force.Also,the raft foundation was analyzed using several methods including finite element method.The measured results show that the calculation results agree well with the measured settlements.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2006年第z2期3363-3371,共9页
Chinese Journal of Rock Mechanics and Engineering
关键词
土力学
岩溶地区
原位压板试验
筏板基础
沉降计算
变形模量
soil mechanics
karst region
in-situ plate loading test
raft foundation
settlement calculation
defo r mation module
作者简介
杨光华(1962-),男,博士,1982年毕业于武汉水利电力学院电厂建筑结构工程专业,现任教授级高工、总工程师,主要从事土的本构理论、基坑工程、软土工程及高层建筑基础工程等方面的研究和设计咨询工作.E-mail:yghsks@21cn.com
