摘要
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。
When the calculating settlement exceeds the demand of passenger decicated line,foundation stabilization measures must be taken for the deep unsaturated soil.The field testing study on the dynamic consolidation is very important for passenger dedicated line＇s construction on the wide unsaturated soil foundation.The field tests show that the load settlement graph of P-S is a hyperbolic curve model before dynamic consolidation,straight line model after dynamic consolidation;after dynamic consolidation,the bearing strength of the ground becomes double in situ,the modulus of compression increase an half;the foundation after dynamic consolidation shows integral action.The displacement of shallow ground is smaller than the natural foundation;the calculating settlement must take a amend coefficient as 0.4 to fit with observing settlement.
出处
《高速铁路技术》
2011年第2期14-17,共4页
High Speed Railway Technology
关键词
非饱和土
强夯
地基沉降
客运专线
unsaturated soil
dynamic consolidation
settlement of foundation
passenger dedicated line
