高填方土石料地基强夯有效加固深度分析

Analysis on effective reinforcement depth of dynamic compaction for high fill earth-rock foundation

强夯法地基加固因工艺简单,施工方便,应用越来越广,特别适用于开山土石回填地基的密实处理。目前强夯法地基加固的有效处理深度及设计计算理论尚不完善,规范给出的经验公式适用范围具有一定的局限性,因而研究不同能级的强夯有效加固深度并建立相应的经验公式很有必要。文章对不同能级的高填方开山土石地基的强夯处理试验区分别采用超重型动力触探、多道瞬态面波测试及点夯时地基深层水平位移监测等手段。确定了各个能级作用下的强夯有效加固深度,并建立了考虑夯击能、夯锤面积等主要施工参数的经验公式。该研究成果可为类似开山土石地基采用强夯法加固设计、施工提供借鉴。

Dynamic compaction method for ground improvement has been widely used because of simple technology and convenient in construction,especially suitable for compaction treatment of earth-rock backfill foundation.At present,the concept of effective treatment depth and the design and calculation theory of dynamic compaction are not perfect,and the empirical formulas given in relevant standard has certain limitations,therefore it is necessary to study the effective reinforcement depth of different levels of dynamic compaction and establish corresponding empirical formulas.In this paper,ultra-heavy dynamic sounding,multi-channel transient surface wave test and monitoring of horizontal displacement of deep foundation layer during point compaction were used in the dynamic compaction test area of high fill earth-rock foundation with different energy levels.The effective reinforcement depth of dynamic compaction under the action of each energy level was determined,and the empirical formulas considering the main construction parameters such as tamping energy and hammer area were established,which can be used for reference in the design and construction of dynamic compaction for similar earth-rock foundations.