软黏土地基离心模型分层预压与机载联合制备方法

doi:10.13722/j.cnki.jrme.2023.0750

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摘要制备软黏土地基的离心模型既是试验的前提和基础，同时也是技术难点。提出一种基于常规重力条件下分层预固结与离心机固结相结合的饱和软黏土离心模型的制备方法，详细阐述分层固结法的原理及步骤，分析固结过程中孔隙水压力及竖向位移的变化，并与压缩量的理论计算结果进行对比。结果表明：对于分层预压固结，在施加每一级荷载作用时，可将沉降速率0.2 mm/h以及超静孔隙水压力消散速率0.2 kPa/h作为软黏土模型固结稳定的条件；对于离心机固结，当离心加速度达到目标值5 h后，模型达到固结稳定状态，可将超静孔隙水压力消散达2 kPa/h且地表竖向沉降量达0.15 mm/h作为软黏土模型的离心固结的稳定条件。研究成果和试验步骤可供今后软黏土离心振动台试验的模型制备提供方法参考和技术支撑，对于提高软黏土离心模型的制备精度具有一定的科学意义。

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	兰景岩1
	2
	咸甘玲1
	王永志3
	4
	王体强3
	4
	刘翔宇1
	任鸿燚1
	汤兆光3
	4

关键词 ：土力学, 饱和软黏土, 离心模型试验, 分层固结排水, 超孔隙水压力

Abstract：The preparation of centrifugal model of soft clay foundation is both the prerequisite and foundation of the test，and at the same time，it is also a technical difficulty. In this paper，a centrifugal model preparation method for saturated soft clay is proposed based on the combination of layered pre-consolidation and centrifuge consolidation under conventional gravity conditions，the principle and steps of layered consolidation method are elaborated in detail，and the changes of pore pressure and vertical displacement in the process of consolidation are analyzed and compared with the theoretical calculations of compression amount. The results show that： for the layered pre-compression consolidation，the settlement rate of 0.2 mm/h and the dissipation rate of excess pore water pressure of 0.2 kPa/h can be taken as the conditions for the consolidation and stabilization of the soft clay model when applying each level of loading；for the centrifuge consolidation，the model achieves the consolidation and stabilization state when the centrifugal acceleration reaches the target value of 5 hours，and the dissipation of the excess pore water pressure of up to 2 kPa/h and the surface vertical settlement up to 0.15 mm/h can be taken as the stabilization conditions for centrifugal consolidation of soft clay model. The research results and test steps can be used to provide methodological references and technical support for the preparation of soft clay centrifugal shaking table tests in the future，which is of scientific significance for improving the preparation accuracy of soft clay centrifugal models.

Key words： soil mechanics saturated soft clay centrifugal model test layered consolidation drainage excess pore water pressure

引用本文:

兰景岩1，2，咸甘玲1，王永志3，4，王体强3，4，刘翔宇1，任鸿燚1，汤兆光3，4. 软黏土地基离心模型分层预压与机载联合制备方法[J]. 岩石力学与工程学报, 2024, 43(5): 1282-1290.
LAN Jingyan1，2，XIAN Ganling1，WANG Yongzhi3，4，WANG Tiqiang3，4，LIU Xiangyu1，REN Hongyi1，TANG Zhaoguang3，4. A combined preparation method of stratified preloading and centrifuge operation for soft clay foundations. , 2024, 43(5): 1282-1290.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2023.0750 或 http://rockmech.whrsm.ac.cn/CN/Y2024/V43/I5/1282

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