1 泥浆在钻孔灌注桩的作用1.1 泥浆是粘土和水拌合的混合物。在钻孔中,由于泥浆比重比水大,故可在孔内产生较大的悬浮液压力,使泥浆向孔外土层渗漏。在钻孔过程中,钻头的运动,使孔壁表面形成一层胶泥,不仅具有护壁作用,而且同时将孔内外水流切断,能稳定孔内水位,防止坍孔。1.2 泥浆比重大,具有悬浮钻渣作用,有利于钻渣的排出,减少了钻头钻进的阻力,提高了钻孔速度。1.3 泥浆具有润滑钻头、冷却钻头的作用。 1 The role of mud in bored piles 1.1 Mud is a mixture of clay and water. In the drilling, due to the proportion of mud mud than water, it can be in the hole to produce greater suspension pressure, so that the mud to the hole outside the soil leakage. During the drilling process, the movement of the drill bit causes the surface of the hole wall to form a layer of clay, which not only has the function of protecting the wall but also cuts off the water flow inside and outside the hole at the same time, stabilizing the water level in the hole and preventing the collapse of the hole. 1.2 mud proportion, with the role of suspended slag, is conducive to the discharge of drilling slag, reducing the resistance of drilling bit, improve the drilling speed. 1.3 Slurry with a lubricating drill, the role of cooling drill.