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MJS工法是在旋喷机具中加入强制排浆管,通过强制排浆来保持地内压力,控制其对加固范围外土体的影响。但其外管直径较大,开孔会破坏管片主筋,无法直接应用到盾构地铁隧道内。因此,利用其强制排浆的特点,开发管径较小、对周围土体扰动小、可以在地铁盾构隧道内施工的旋喷设备。为验证改造后设备的效果,利用改造后的设备对特定的土层进行旋喷加固试验,在试验过程中使用单点位移计监测上覆土层隆沉情况,使用测斜孔监测试验过程中对周围土体的扰动情况,并采用静力触探来探测喷浆加固效果和加固范围。通过对喷浆加固效果和加固范围以及引起上覆及周围土体变形量的分析,为隧道内不均匀沉降段下卧土层喷浆加固提供借鉴和参考。
MJS workmanship is to join the forced ejection pipe in the rotary jetting equipment to maintain the pressure in the ground by forcing the slurry to control the impact on the soil outside the reinforcement range. However, the diameter of the outer tube is larger, and the opening will destroy the main reinforcement of the pipe and can not be directly applied to the shield tunnel. Therefore, the use of its characteristics of mandatory drainage, the development of smaller diameter, small disturbance to the surrounding soil, can be constructed in the subway shield tunnel spray equipment. In order to verify the effect of the modified equipment, the modified equipment is used to carry out the jet-jet reinforcement test on a specific soil layer. During the test, the single-point displacement meter is used to monitor the condition of the overburden soil layer. During the test, Surrounding soil disturbance, and the use of static probe to detect shotcrete reinforcement effect and reinforcement range. By analyzing the effect of reinforcement and reinforcement of shotcrete and the deformation caused by overburden and the surrounding soil, it can be used as a reference for the shotcrete consolidation in the under lying subsidence zone in tunnel.