【摘 要】
：
本文以深季节冻土地区越冬深基坑为研究对象,采用物理模型试验方法,研究了深基坑在冻融过程中的冻胀力的变化特征,得出结论:深基坑在冻结过程中,冻结深度和冻胀力均随着时间的增加而增大,但不同深度处的水平冻胀力增长幅度差异明显；在冻结结束后的融化阶段,基坑底部的冻胀力仍保持增大趋势,而基坑上部的冻胀力先小幅的增大,随后缓慢的减小;基坑在冻结阶段中沿桩底部至顶部,冻胀力经历了减小-增大和减小的阶段,冻结过程
【机 构】
：
中国矿业大学力学与土木工程学院,江苏徐州221116 中国矿业大学深部岩土力学与地下工程国家重点实
【出 处】
：
城市地下空间与地质灾害防治技术论坛暨第八届江苏省岩土力学与工程学术会议
论文部分内容阅读
本文以深季节冻土地区越冬深基坑为研究对象,采用物理模型试验方法,研究了深基坑在冻融过程中的冻胀力的变化特征,得出结论:深基坑在冻结过程中,冻结深度和冻胀力均随着时间的增加而增大,但不同深度处的水平冻胀力增长幅度差异明显；在冻结结束后的融化阶段,基坑底部的冻胀力仍保持增大趋势,而基坑上部的冻胀力先小幅的增大,随后缓慢的减小;基坑在冻结阶段中沿桩底部至顶部,冻胀力经历了减小-增大和减小的阶段,冻结过程中,基坑底部位置冻胀力急速增加,试验测得冻胀力达到了53kPa,对应基坑原型后为840kPa,远大于《冻土地区建筑地基基础设计规范》JGJ118-2011中挡土墙水平冻胀力设计值,甚至达到现行规范给定设计土压力的4倍.研究成果可以为中国广大的深季节冻土区越冬基坑的设计提供基础参考.
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