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Horizontal stress increase induced by deep vibratory compaction
Proceedings of the Institution of Civil Engineers - Geotechnical Engineering ( IF 2.2 ) Pub Date : 2020-05-12 , DOI: 10.1680/jgeen.19.00040
K. Rainer Massarsch 1 , Carl Wersäll 2 , Bengt H. Fellenius 3
Affiliation  

Compaction by vertically or horizontal oscillating probes increases not only the soil stiffness but also the horizontal effective stress. An important, but often neglected, consequence is that compaction also causes preloading of the soil. The change in horizontal stress following vibratory compaction can be measured independently by two in situ methods – a cone penetration test (CPT) and a flat dilatometer test (DMT). Values of sleeve resistance (CPT) and horizontal stress index (DMT) can be determined prior and after compaction. In this work, five case histories reported in the literature where different vibratory compaction methods were used (dynamic compaction, vibroflotation, VibroWing, TriStar and resonance compaction) were re-analysed. For each test site, the change in CPT cone resistance and sleeve resistance was determined and compared with the increase in horizontal stress index from DMTs. The preloading effect due to vibratory compaction was estimated using empirical correlations.

中文翻译:

深层振动压实引起的水平应力增加

垂直或水平振动探针的压实不仅增加了土壤刚度,而且还增加了水平有效应力。一个重要的但通常被忽略的结果是压实还引起土壤的预紧。振动压实后水平应力的变化可以通过两种原位方法分别进行测量:锥入度试验(CPT)和平面膨胀计试验(DMT)。可以在压实之前和之后确定套筒阻力(CPT)和水平应力指数(DMT)的值。在这项工作中,重新分析了文献中报道的五种病史,其中使用了不同的振动压实方法(动态压实,振动浮选,VibroWing,TriStar和共振压实)。对于每个测试站点,确定CPT锥体阻力和套筒阻力的变化,并将其与DMT引起的水平应力指数的增加进行比较。使用经验相关性估算了由于振动压实而产生的预紧效果。
更新日期:2020-06-30
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