吹填粉细砂动强度影响因素试验研究

发布时间：2018-06-18 06:17

  本文选题：吹填砂 + 粉细砂　； 参考：《水运工程》2016年05期

【摘要】：针对汕头东部经济带吹填粉细砂,通过动三轴试验,研究粉粒含量、黏粒含量、初始相对密实度、固结应力、固结应力比对吹填粉细砂动强度的影响规律。试验结果表明,吹填粉细砂动强度随粉粒含量增加而降低,破坏振次相同时,粉粒含量为18%时的动强度为粉粒含量为0时的1/2。动强度在粉粒含量为6%~9%时降低幅度出现突变,相同破坏振次下,降低幅度约为22%。吹填粉细砂抗液化强度并不是随着黏粒含量的增加而单调增加的,临界黏粒含量值为12%。初始相对密实度对吹填粉细砂动强度影响较小。固结应力小于200 k Pa时,吹填粉细砂动强度随固结应力的增加而增加;大于200 k Pa时,试样已接近最小孔隙比,增加固结应力已不能增大试样密实度,动强度不再增加。当固结比小于2时,吹填粉细砂动强度随固结应力比的增加而增加。
[Abstract]:Based on the dynamic triaxial test, the effect of silt content, clay content, initial relative compactness and consolidation stress ratio on the dynamic strength of silty sand in the eastern economic belt of Shantou was studied by means of dynamic triaxial test. The results show that the dynamic strength of fine sand decreases with the increase of silt content, and the dynamic strength of silt is 1 / 2 of that of 0 when the damage vibration frequency is the same. When the content of powder is 6 ~ 9, the dynamic strength has a sudden change in decreasing amplitude, and under the same damage vibration times, the decreasing amplitude is about 22. The liquefaction resistance of fine sand is not monotonously increased with the increase of clay content, and the critical clay content is 12. The initial relative compactness has little effect on the dynamic strength of fine sand. When the consolidation stress is less than 200 KPA, the dynamic strength of the fine sand increases with the increase of the consolidation stress, and when the consolidation stress is greater than 200 KPA, the specimen is close to the minimum void ratio, the compactness of the specimen can not be increased by increasing the consolidation stress, and the dynamic strength is no longer increased. When the consolidation ratio is less than 2, the dynamic strength of fine sand increases with the increase of consolidation stress ratio.
【作者单位】： 中交交通基础工程环保与安全重点实验室;中交四航工程研究院有限公司;中交四航局港湾工程设计院有限公司;
【分类号】：P75;TU41
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本文编号：2034483