吹填粉细砂动强度影响因素试验研究

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 kPa时，吹填粉细砂动强度随固结应力的增加而增加；大于200 kPa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。

Experimental study on factors affecting dynamic strength of reclamation silty sand

The impact of the clay content,initial relative compactness,consolidation stress,consolidation stress ratio on the dynamic strength of reclamation silty sand in the eastern economic zone of Shantou city is studied by the dynamic triaxial test.The results show that the dynamic strength of reclamation silty sand increases with the silt content.The strength decreases 50% when the silt content increases from 0 to 18%.The dynamic strength does not monotonically increase with the increase of the clay content,and the critical value is 12%.The initial relative compactness has little influence on the dynamic strength.When the consolidation stress is less than 200 kPa,the dynamic strength will increase with the consolidation stress.The dynamic strength increases slowly when the consolidation stress is greater than 200 kPa.When the consolidation stress ratio is less than 2,the dynamic strength increases with the increase of consolidation stress ratio.