人工封装桩处理下水闸软土复合地基土力学特性试验研究

为研究散体人工封装桩处理下冲口门水闸软土复合地基土力学特性，开展了高径比、散体料密实度对土力学指标影响的室内试验。试验表明，试样高径比愈小，则承载强度愈高，且具有较显著脆性变形；随高径比的梯次变化，围压100kPa、400kPa 下分别具有平均降幅10.3%、14.8%。散体填充料密实度愈大，则复合土强度愈高，受围压效应影响愈显著，且具有较长应变硬化段。抗剪特征参数与高径比呈负相关关系，与散体料密实度呈正相关关系，前者影响作用于黏聚力，后者主要影响内摩擦角。研究成果可为软土等不良土层场地的人工桩设计应用提供参考。

英文摘要:

In order to study the soil mechanical properties of soft soil composite foundation of Xiachongkou Gate sluice treated by loose artificial sealed piles，laboratory tests were carried out to study the effects of height diameter ratio and compactness of loose materials on soil mechanical indexes. The test shows that the smaller the height diameter ratio of the specimen is，the higher the bearing strength will be and more significant the brittle deformation will be；With the gradient change of height diameter ratio，there is an average decrease of 10.3% and 14.8% respectively under the confining pressure of 100kPa and 400kPa. The greater the compactness of granular filler is，the higher the strength of composite soil and the more significant effect of confining pressure with a relatively long strain hardening section will be. The shear characteristic parameters are negatively related to the height diameter ratio，and positively related to the compactness of bulk materials. The former affects the cohesion，while the latter mainly affects the internal friction angle.The research results can provide reference for the design and application of artificial piles in soft soil and other unfavorable soil layers.

查看全文查看/发表评论下载PDF阅读器

关闭