摘要
为确保建筑物的安全,获得真实的地基承载力变得尤为重要。利用弹性理论法和有限差分法,分别对堆载法浅层平板载荷试验中堆载对地基承载力试验过程及结果存在的影响进行了定性和定量化分析。结果表明:运用堆载法确定地基承载力特征值时,随着载荷试验的进行,堆载引起的附加应力场将逐渐减小至消失;堆载对周边土体的预压、基准点的相对位移,均使得由荷载-位移曲线所得地基承载力的特征值较真实情况偏大;堆载法浅层平板载荷试验实际上高估了地基的承载力。
Achieving the accurate bearing capacity of foundations has become quite significant in order to guarantee the safety of buildings.With the elasticity theory and the finite difference method,the qualitative and quantitative analyses of the effect of heaped load on bearing capacity of foundations in the heaped load method for shallow plate load test had been performed.The results show that when using the heaped load method to get the bearing capacity of foundations,the additional stress caused by heaped load would gradually decrease and disappear finally in the test with the progress of plate load test;both the preloading on the surrounding soil and the displacement of datum point will make the characteristic value of foundation bearing capacity,which is obtained from the load-displacement curve,become overestimated;so the bearing capacity of foundations got from piling-up weights method of shallow plate load test is actually larger than its real value.4 tabs,13 figs,17 refs.
出处
《长安大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2013年第3期55-61,共7页
Journal of Chang’an University(Natural Science Edition)
关键词
土木工程
堆载法
地基承载力
基准点
位移
附加应力
civil engineering
heaped load method
bearing capacity of foundation
datum point
displacement
additional stress
