湿陷性黄土高填方地基处理技术及边坡稳定性机理研究  

Research on the Treatment Technology of High Fill Foundation in Collapsible Loess and the Mechanism of Slope Stability

作　　者：张占超 ZHANG Zhanchao(Zhangjiakou city Zhengyuan engineering testing center,Hebei Zhangjiakou 075000)

机构地区：[1]张家口市正元工程检测中心,河北张家口075000

出　　处：《河北建筑工程学院学报》2023年第4期59-62,共4页Journal of Hebei Institute of Architecture and Civil Engineering

基　　金：2023年度张家口市基础研究和人才培养计划项目(2322004A)。

摘　　要：以湿软、含水量高、沟谷高孔隙比、低强度、高压缩性的黄土为研究对象,从黄土的物理特性出发,开展该区湿软地基的力学特性及稳定性研究。以某黄土高填方试验黄土为研究对象,采用缩尺素土挤密桩、碎石桩加固地基试验,对处理后的地基的承载力、湿陷程度等进行测试与评估。研究发现,对湿陷性黄土进行素土挤密桩加固,能够得到了较好的单桩承载力;采用素土挤密桩进行加固地基后,桩间土的湿陷程度并没有彻底消除,其干密度与加固前相差不大,但其压缩模量增幅的大小则存在一定差异;对湿陷性黄土地基,经碎石桩加固后,桩体的密实度有一定程度的提高,但其密实度随深度的不同而有很大的差异;此外,采用较小间距对地基的加固效果较好。Based on the physical characteristics of loess,the study focuses on the mechanical properties and stability of wet and soft foundations in this area,which are characterized by high moisture content,high pore ratio in valleys,low strength,and high compressibility.Taking a certain loess high fill test loess as the research object,using scaled plain soil compaction piles and gravel piles to reinforce the foundation,the bearing capacity and degree of collapsibility of the treated foundation are tested and evaluated.Research has found that strengthening collapsible loess with plain soil compaction piles can achieve good single pile bearing capacity;After using plain soil compaction piles to reinforce the foundation,the degree of soil wetting between the piles has not been completely eliminated,and the dry density is not significantly different from before reinforcement,but there is a certain difference in the magnitude of the increase in compressive modulus;For collapsible loess foundation,after being reinforced with gravel piles,the compactness of the pile body has been improved to a certain extent,but its compactness varies greatly with depth;In addition,using smaller spacing has a better reinforcement effect on the foundation.

关 键 词：湿陷黄土 地基处理 湿陷程度 稳定性 

分 类 号：TU4[建筑科学—土工工程]