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旋喷桩是七十年代初在静压注浆技术基础上发展起来的一种地基加固新技术。首先在日本,现我国也试验和应用了单管、双重管、三重管旋喷法加固地基。为了在较密的土体内获得较大而匀直的桩径,采用高压喷射和机械扩孔相结合的造桩方法,即以高压浆液射流破坏土体为主,辅以叶片旋转切削作用,扩大土体破坏的范围,并使浆液和土体拌和凝固成桩。成桩工艺可自上而下或自下而上进行。当上部为粘性土而又需较高的桩体强度时,先自上而下喷射扩孔,吸出孔内被破坏和液化的粘性土,换填砂石骨料后,再由下而上喷浆固结成强度较高的桩体。
Jet grouting piles are a kind of new ground reinforcement technology developed on the basis of hydrostatic grouting technology in the early 1970s. First in Japan, now China has also tested and applied the single-tube, double-tube, triple-tube rotary jet reinforcement method. In order to obtain a large and uniform pile diameter in a dense soil, a combination of high-pressure injection and mechanical reaming is used for the pile-building method, that is, the high-pressure slurry jet destroys the soil and is mainly assisted by the rotary cutting action of the blades. The scope of soil destruction, and the slurry and soil mixed and solidified into piles. The pile forming process can be performed from top to bottom or bottom to top. When the upper part is cohesive soil and a higher pile strength is required, the hole is first expanded from top to bottom to suck out the damaged and liquefied cohesive soil, replace the sand aggregate, and spray from the bottom up. The pulp is consolidated into higher strength piles.