摘要
西部山区修建高速公路穿越湿陷性黄土地区时面临诸多设计和施工问题。选择国道312线典型湿陷性黄土地基试验段,进行了不同夯击能量的强夯试验。通过对强夯土体室内、外试验结果分析,揭示了强夯前后湿陷性黄土的变化规律,得出:压实度与孔隙比呈线性递减关系;压实度不小于95%时施工含水量的合理范围应控制在11.9%～15.4%,土体分布-1～-5 m;2 000 kN.m、3 000 kN.m、6 000 kN.m强夯的加固深度分别为5～6 m、6～7 m和8.5～10 m,大于加固深度后地基土强度提高不明显。
Combining with field tests of a typical section of No. 312 national highway and indoor tests the subgrade tests have been done on the typical collapsible loess area in western China, in which the special soil are distributed in many places and bring out many questions on design and constructions of freeway. According to analyze the physic-dynamic parameter of foundation, the paper puts forward the regularities of collapsible loess before and after handled by dynamic consolidation, acquires the basis parameters of dynamic consolidation. On the basis of tests, the impacting factors of compaction degree were studied. Results show that the relation between compaction degree and void-ratio is negative liner approximation. As compaction degree is more than 95%, the reasonable range of water content is to be controlled at 11.9%-15.4%, compaction soil is at -1- -5 m, the depth of 2 000 kN-m, 3 000 kN.m, 6 000 kN.m dynamic consolidation are seperately at 5-6 m, 6-7 m and 8.5-10 m, larger than which the efficiency of foundation reinforcement is not apparent.
出处
《煤田地质与勘探》
CAS
CSCD
北大核心
2008年第5期48-50,53,共4页
Coal Geology & Exploration
基金
西部课题"路桥过渡段路基修筑技术"项目(200131881259)
关键词
湿陷性黄土
强夯
路基
地基加固
collapsible loess
dynamic consolidation
subgrade
foundation reinforcement
