高填方路堤软弱区域爆破挤密技术

Explosive Compaction Technology Applied to Weak Areas of High-filled Embankment

为了解决在传统高填方路堤加固工程投资巨大且加固效果不好的问题,提出了爆破挤密技术对路堤进行处理。炸药在土中爆炸结束后,形成的地下爆腔对周围土体产生挤密作用,只需对腔体内逐层填料并压实即可实现高填方路堤的加固过程。通过对9组不同工况下的试验模型进行研究,分析不同含水率和不同压实度下的爆破挤密效果。结果表明,爆前压实度较低、含水率较大的土体形成的爆腔较大,压密范围较大,反之则小。同时,某高速公路高填方路段的试验工程也证明该技术的效果较好,没有造成路面及边坡的破坏,可以缩短养护维修工期、降低成本、降低占路施工对交通的影响程度。

Application of the explosive compaction technology is proposed to solve the problem that conventional high-filled embankment reinforcementproject is costlyand has unsatisfactory effect.,A cavity is formed after blasting in soilunderground,withthe soil around the cavitycompressed under blast loading.The embankment is reinforcedby filling materials into the blasting cavity and compressingthem layer by layer. This paper studies the explosive experiments under nine different conditions and analyzesthe compaction effectunder different water content and compaction degree. The results show thatsoil with lowcompactiondegree and highwatercontent before blastingformsblasting cavities with relatively large radius.The test project carried out on a highwaywith high- filled embankmentdemonstrated that application of thetechnology achieved satisfactory effect with undamagedpavement and slope, shortened duration of maintenance and repair,reduced cost,and reduced impact of road construction on traffic.