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一、概述压密注浆(compaction grouting)20世纪50年代早期首先在美国应用,到目前为止,已有近半个世纪的历史,其应用领域日益广泛,包括水利工程、地铁隧道工程以及建筑物的加固、纠偏工程等等。压密注浆,概括地说就是将极稠的低流动性的浆液(塌落度小于50mm)在高压泵压力(4MPa)下注入到预定的位置,以增加软弱、松散或扰动土的密度,当选定适当的材料或注浆参数时,浆液可形成以注浆点为中心的规则的和有控制的加固体。在靠近地表处,压密注浆可能引起地面及相应结构物的抬动,类似于底板顶升原理,这也是压密注浆经常用于建筑物纠偏的原因。在20世纪70年代,压密注浆第一次用于隧
I. Overview Compaction grouting was first applied in the United States in the early 1950s and so far it has nearly half a century of history and has been used in a wide range of applications including water conservancy projects, subway tunneling projects, and buildings Reinforcement, correction works and so on. Compaction grouting, in summary, is the injection of a very thick, low fluidity slump (slump less than 50 mm) into a predetermined location under high pressure pump pressure (4 MPa) to increase the density of weak, loose or disturbed soils, When selecting the appropriate material or grouting parameters, the grout can form regular and controlled reinforcements centered on the grout point. Close to the surface, compaction grouting may cause the ground and the corresponding structure of the lift, similar to the principle of floor lifting, which is also the reason that compaction grouting is often used for building correction. In the 1970s, compaction grout was first used for tunneling