排水条件对不同固结度软黏土动力特性影响试验研究

发布时间：2018-02-11 15:42

本文关键词： 饱和软黏土固结度排水条件孔压应变　出处：《岩土工程学报》2015年05期 　论文类型：期刊论文

【摘要】：地铁隧道下卧土层由于施工扰动通常存在不同固结度,列车荷载下土体应变规律也有所差异,进而产生不均匀沉降。通过室内动三轴试验系统对杭州饱和软黏土进行动力测试,研究了排水条件、固结度、振动次数对软黏土动孔压和应变的影响,在试验和现有研究成果的基础上建立了考虑初始固结度、振动次数、排水条件的应变软化模型。结果表明:固结度愈高的土体,孔压发展愈缓慢,并且随振动次数增加,在较低的孔压水平就可达到稳定,排水条件下的孔压发展规律可由不排水试验获取。土体应变随循环次数的增加而增加,随固结度的增加而降低;提出的应变模型考虑了荷载循环过程中土体的排水,可以较好地模拟不同固结度下饱和软黏土的应变发展规律。
[Abstract]:Due to the different degree of consolidation in the underlying soil layer of the subway tunnel, the strain law of the soil under train load is also different, resulting in uneven settlement. The dynamic test of the saturated soft clay in Hangzhou is carried out through the indoor dynamic triaxial test system. The effects of drainage conditions, consolidation degree and vibration times on the dynamic pore pressure and strain of soft clay are studied. Based on the experimental results and existing research results, the initial consolidation degree and vibration times are considered. The results show that the higher the degree of consolidation, the slower the pore pressure develops, and with the increase of vibration times, the lower the pore pressure level is, the more stable the pore pressure is. The development rule of pore pressure under drainage condition can be obtained by undrained test. The strain of soil increases with the increase of cyclic times and decreases with the increase of consolidation. The strain development law of saturated soft clay under different consolidation degree can be well simulated.
【作者单位】：浙江大学城市学院土木工程系;招商局蛇口工业区有限公司;
【基金】：国家自然科学基金项目(51278463) 杭州市科技计划项目(20130533B28)
【分类号】：TU411

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