摘要
在立井回填过程中,出现了回填高度不稳定、悬吊管受力变化幅度大等异常现象。分析认为:沙石回填沉降行为是影响回填高度不稳定、悬吊管受力变化幅度大的主要因素。利用模拟井筒进行沙石颗粒群沉降实验表明,细颗粒的存在,使井筒中出现明显软夹层,该层强度相对较低、含液量高,一般悬浮在井筒中,是影响回填高度不稳定的主要原因。
During the process of sand and stone backfilling, such abnormal phenomena like instable backfilling height, large extent of the simulated casing stress, which directly affect the safety of project. By preliminary analysis, the behavior of sand and stone when backfilling is the major factor that leads to instable backfilling height and large extent of the simulated casing stress. Using simu- lated shaft for sand and stone deposition experiments, the results show that the fine particle is one of the prime reasons leading to instable backfilling height, and the strain of the simulated casing increased abruptly to one time greater than before in the process of the ＂ abrupt deposition＂.
出处
《岩土工程技术》
2011年第4期211-213,共3页
Geotechnical Engineering Technique
关键词
沙石
实验研究
悬吊管
sand and stone
experiment research
simulated casing
