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重庆天府矿务局磨心坡洗煤厂工程共施工104个挖孔桩。挖孔桩开挖直径最大1600mm,最小1200mm,深12～18m,地质条件较差,上部被6 m左右的矸渣和煤渣覆盖,下部要穿过粘土、轻亚粘土和冲洪积物,基底为泥岩。与基底交界处为500～800mm厚的卵石、碎石夹砂的古河床底,地下水距地表3 m左右。挖孔桩护壁为现浇200号混凝土,平均壁厚100mm。由于地下水的影响,轻亚粘土在动水压力作用下易形成流砂,本文介绍我们在施工中的几点做法。一、对地下水的处理方法施工到有地下水的位置后,采用QY-25型潜水泵排水。随深度的加深,水的压力也逐渐加大,护壁质量不容易保证,直接影响下部施工。根据这一情况,我们在水压不
A total of 104 digging piles were constructed at the Chongqing Tianfu Coal Mining Administration. The digging pile excavation diameter is up to 1600mm, the minimum is 1200mm, and the depth is 12 to 18m. The geological conditions are poor. The upper part is covered by slag and cinder of about 6 m, and the lower part is to pass through the clay, light sub-clay and alluvial sediments. For mudstone. At the junction with the basement, there are 500-800mm thick pebbles and gravel with sand on the bottom of the ancient riverbed. The groundwater is about 3 m away from the surface. Digging pile retaining wall is cast-in-place No. 200 concrete with an average wall thickness of 100mm. Due to the influence of groundwater, light sub-clay is easy to form quicksand under dynamic water pressure. This article describes some of our practices in construction. First, the groundwater treatment method After the construction to the groundwater position, the use of QY-25 submersible pump drainage. With the deepening of the depth, the pressure of the water is gradually increased, and the quality of the retaining wall is not easy to guarantee, which directly affects the construction of the lower part. According to this situation, we have no water pressure