广东省高速公路改扩建工程软基处治关键问题分析及对策

分析了广东省高速公路改扩建工程软基处治中的关键问题,指出路基沉降与差异沉降、新路基沉降对旧路的影响、软基施工方案等,是其中3大关键问题.之后提出了相应的解决对策:加宽工程适宜的软基处治方案为换填、水泥搅拌桩等复合地基、排水固结法十沉降隔离墙、高压旋喷桩、气泡混合轻质土路堤,并提出了不同条件下宜采用的软基处治方案.最后给出了两个改扩建工程典型软基处治的实例.

Key Problems and Countermeasures of Soft Ground Improvement for Expressway Widening Engineering of Guangdong Province

Settlements of new embankment,differential settlements between new and old embankments,effect of new embankment load on settlement of old embankment and construction techniques are three key problems for expressway widening engineering.Countermeasures against these key problems are suggested.There are some techniques applicable to reinforcing soft soil under widened embankment,such as replacement method,composite ground with cement soil pile,or CFG pile,drainage consolidation method combined with separating wall,embankment of air foamed lightweight soil.Most appropriate methods corresponding to different conditions are proposed.Two cases of soft ground improvement for widening embankment are introduced.