湿陷性黄土冲沟区高填方路基设计方案研究

摘要:

在黄土冲沟地区修建高等级道路、高填方路基时，应重点关注对湿陷性黄土的处理。本文依托晋中市环城东路北延高填方路基工程，提出“强基、稳堤、固坡、疏水”的设计方案：采用灰土挤密桩处理Ⅱ级自重湿陷性冲沟场地并控制地基承载力不低于250kPa；采用分层强夯法填筑路基并动态监控路基变形情况；采用分级放坡、设置坡脚墙等措施增强边坡稳定性；在沟底设置双排圆管涵解决雨水横向过路问题。工后两年路基状况良好，可为同类工程的设计提供参考。

Abstract:

The treatment of collapsible loess should be paid more attention to when constructing high grade road and high-filled embankment in loess gully area. Design method of high-filled embankment in collapsible loess area was studied based on the high-filled embankment of north extension of ring road in Jinzhong. The design scheme of "strong foundation, steady embankment, solid slope, and drainage" was proposed. The undisturbed foundation at the bottom of the ditch was treated by lime-soil compaction pile, and the bearing capacity of the foundation is not less than 250kPa. The layered dynamic compaction method was used to deal with the backfill, and the deformation of the roadbed was dynamically monitored. In order to enhance the stability of the slope, the slope was graded and the slope foot wall was set. Two pipes were set at the bottom of the ditch to solve the problem of transverse passage of rainwater. The high-filled embankment is in good condition two years after construction. The purpose of this paper is to provides reference for similar projects in further.