西北工程技术学报2025，Vol.24Issue(1)：38-44,7.
强夯置换处置山间软土地基的宏细观特性
Macro and Micro Characteristics of Dynamic Compaction Replacement Treatment of Soft Soil Foundations in Mountainous Areas
摘要
Abstract
This study relies on a soft soil foundation treatment project in a mountainous section of the Liuzhi to Anlong Expressway to test the settlement due to dynamic compaction replacement.A numerical model for dynamic compaction replacement treatment of soft soil foundation was constructed,and the construction process of dynamic compaction replacement of soft soil foundation was simulated based on on-site conditions,revealing the formation mechanism of dynamic compaction replacement piers in soft soil foundation.The results indicate that the cumulative compaction settlement increases approximately linearly with the increase of compaction blows.The single compaction settlement and cumulative compaction settlement are closely related to the compaction energy.The greater the compaction energy,the greater the compaction settlement.To achieve the same compaction settlement,the higher the compaction energy,the fewer the compaction blows,while the lower the compaction energy,the more the compaction blows.During the dynamic compaction process,the settlement per impact gradually decreases as the number of fill placements increases.After 8 fills,the relationship curve between the bottom settlement of the pit and the number of impacts changes very little.The peak vertical dynamic stress at the bottom of the compaction pit reaches 339 kPa,rapidly decreasing after the the hammer is lifted,approaching the pre-compaction level 0.1 s.Subsequently,as the hammer falls,the vertical stress rises and stabilizes around 110 kPa.The maximum replacement width increases approximately linearly with the number of fillers.After the number of placements exceeds 4,the maximum replacement width is greater than the maximum replacement depth.At the end of dynamic compaction,the maximum displacement width is about 1.46 times the maximum replacement depth.关键词
道路工程/强夯置换/碎石墩/置换范围/大变形/动力响应/离散元法Key words
road engineering/dynamic compaction replacement/gravel pier/replacement range/large deformation/dy-namic response/discrete element method分类
土木建筑引用本文复制引用
柳正,张向川,秦桂芳,李绍龙,聂如松..强夯置换处置山间软土地基的宏细观特性[J].西北工程技术学报,2025,24(1):38-44,7.基金项目
国家自然科学基金项目(51878666) （51878666）
贵州路桥集团有限公司技术开发项目(LATJ-13-KY01) （LATJ-13-KY01）
