与地下潜水相连通含水大(砂)坑路基填筑施工方法

Subgrade Filling Construction Technology of Big Water Pit Connecting with Underground Latent Water

结合工程实例,对高速公路填方路基经过与地下水相通的砂砾地质含水大坑的施工方法进行探讨,即浸水部分采用水稳定性好、透水率高、强度大、经济性好的炮渣石采用竖向分层填进行坐底,然后采用强度高、稳定性好、孔隙率较大的砂砾填料进行水平分层填筑至大坑自然地坪,再采用常规填料水平分层填筑至设计标高。这样既满足了路基的稳定性,又提高了填筑速度,还因采用了孔隙率好的填料避免了水的毛细现象对上层填层的危害。

Combing with engineering example,the highway subgrade filling construction technology in gravel stratum of the big water pit connecting with underground latent water is discussed. Firstly,the water immersion part of the big pit is filled by slag stone with characteristics of good water stability,high permeability rate,big strength and good economic. Secondly,the other is filled to nature ground by gravel with big strength,good stability and large porosity by horizontal layers. Lastly,the normal filling material is taken to filling the subgrade to design elevation by layer. This method not only satisfies the stability of subgrade,but also improves filling speed,and also avoiding the hazard of water to upper filling layer because of taking good porosity filling material.