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在较深厚的非饱和土地基上修建客运专线,当沉降不满足设计要求时需进行地基加固。强夯是一种较为经济的地基加固措施,进行非饱和土地基强夯加固现场试验研究,对在大量存在的非饱和土地基上修建客运专线具有重要意义。研究表明:强夯前地基荷载试验P-S为双曲线模型,强夯后呈直线型;试验断面地基承载力提高1倍左右、影响范围土层压缩模量提高50%左右;强夯影响范围土体整体作用明显,强夯地基表层水平位移小于天然地基;试验断面强夯后观测沉降与计算沉降之比为0·4。
Passenger lanes should be built on deeper unsaturated soil so as to reinforce foundation when the settlement does not meet the design requirements. Dynamic compaction is a more economical foundation reinforcement measures. The field test on the dynamic compaction and reinforcement of unsaturated soil is of great significance to the construction of passenger dedicated lines on the existing unsaturated soil foundation. The results show that: before loading, the PS of the dynamic compaction test is a hyperbola model with a straight line after dynamic compaction. The bearing capacity of the test section is increased by about 1 time, and the compressive modulus of soil in the affected area is increased by 50% The overall effect is obvious. The horizontal displacements of the surface of the compacted ground are less than that of the natural ground. The ratio of the observed settlement to the calculated settlement after the dynamic compaction in the test section is 0.4.