一般均质地面承载力现场试验

Outfield tests on bearing capacity of general homogeneous soil ground

摘要:

为了评判施力盘作用下地面的承载安全,进行了一般均质地面承载力静态与动态荷载现场试验.采用平板载荷静态加载方法进行了模拟施力盘静态荷载的平板载荷试验,根据相似准则π定理进行了缩比施力盘动载试验.在现场试验的基础上研究了静载条件下沉降量随时间变化的S-t曲线,不同尺寸承载板在相应载荷作用下的地面土体沉降量之间关联关系的P-S/D曲线及动、静荷载下载荷与沉降量关系的P-S曲线以及动静载荷对比的P-S曲线.分析结果表明:对于进行现场试验的均质地面,S-t曲线表明静态加载方法合理;P-S/D曲线在极限载荷内呈线性比例关系;动载下的沉降量S远远小于静载条件下的沉降量S,动载下的土体变形刚度较静载下的变形刚度高,瞬间动态荷载造成的地面沉降可忽略.

Abstract:

In order to judge the bearing safety of homogeneous ground that the heavy forcing plates acted on,static and dynamic outfield tests were carried out.According the static plate loading method,the outfield test that bearing plates simulating the static procedure of heavy forcing plates was performed.By the similarity criterion π theorem,the pneumatic impact test of reduced proportional plate simulating the dynamic procedure of forcing plate was completed.Based on the outfield tests,the paper studied the S-t curves that express the variety of settlement with time,the P-S/D curves that express the soil settlement correlative relation among bearing plates with different sizes under the corresponding load,the P-S curves under static and dynamic loads as well as the contrast between them.To the homogeneous soil ground in outfield tests,S-t curves indicate that the static load method is reasonable,and P-S/D curves appear a linear proportional relation in the limit load range.The settlement under dynamic load is much less than that under static load.The deformation stiffness under dynamic load is higher than that under static load.The settlement caused by instant dynamic impact can be ignored.