摘要
通过在离心场中模拟沟槽开挖过程的模型试验,讨论挖掘机等建筑机械在开挖市政管线的沟槽过程中产生的偏心荷载对沟槽稳定性的影响。试验结果表明,沟槽的破坏形态与挖掘机中心荷载作用情况下相同。据此,可利用在中心荷载作用下求得的开挖深度极限分析上限解简化式,计算建筑机械偏心荷载作用下的沟槽开挖深度,并且所得计算结果与试验结果基本吻合。结果表明:偏心距对开挖深度的影响程度因挖掘机接触压力不同而不同。挖掘机接触压力越大,偏心距对开挖深度的影响也越大。
The influence of the construction machinery eccentric load on trench stability was studied by centrifuge model tests simulating the process of trench excavation. It was shown that the failure mechanism agreed well with that under the central load of construction machine. Therefore, the simplified expression for the upper-bound of excavation depth under the central load could be applied to that under the construction machinery eccentric load. The validity of the results from the simphfied expression for the upper-bound solution was confirmed by comparing with the centrifuge test results. It was indicated that the influence of eccentricity on excavation depth increased with the increase of contact pressure.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2008年第5期705-711,共7页
Chinese Journal of Geotechnical Engineering
基金
国家自然科学基金资助项目(50779062)
关键词
建筑机械偏心荷载
开挖
沟槽
稳定性
离心模型试验
上限解
construction machinery eccentric load
excavation
trench
stability
centrifuge model test
upper-bound solution
