地铁区间隧道黄土地层注浆预加固技术研究

发布时间：2018-11-19 07:17

【摘要】：根据西安地铁浅埋暗挖区间隧道施工的实际情况,为提高黄土地层的围岩强度,降低围岩的透水性能,采用二重管无收缩注浆预加固技术对地层进行注浆预加固。然后通过现场观察取样、室内试验和数值模拟分析研究地层注浆预加固后的效果。结果表明:掌子面有大量明显的浆脉,且围岩稳定,未发生坍塌、失稳、涌水、涌泥等现象;掌子面土体均比注浆前的土体坚硬、密实,取回的土样也不易破碎;掌子面土体的平均含水率降低,渗透系数显著减小,黏聚力和内摩擦角增大,抗剪强度增强,无侧限抗压强度明显提高;初期支护受力状况得到明显改善,围岩塑性区范围与塑性应变值减小。由此可见注浆预加固措施取得了明显的效果。
[Abstract]:In order to improve the strength of the loess layer and reduce the permeability of the surrounding rock, the pre-reinforcement technology of double-pipe non-shrinkage grouting is used to pre-strengthen the stratum. The tunnel construction of the shallow underground excavated section of Xi'an subway is carried out in order to improve the strength of the surrounding rock and reduce the permeability of the surrounding rock. Then the effect of pre-reinforcement of stratum grouting is studied by field observation sampling, laboratory test and numerical simulation analysis. The results show that there are a lot of obvious veins on the face of the palm, and the surrounding rock is stable, no collapse, instability, water gushing, mud gushing, and so on, and the soil on the palm surface is harder and denser than the soil before grouting, and the soil samples taken back are not easy to be broken. The average moisture content of the palm-face soil is decreased, the permeability coefficient is significantly reduced, the cohesion and the internal friction angle are increased, the shear strength is enhanced, and the unconfined compressive strength is obviously increased. The stress condition of initial support is improved obviously, and the range of plastic zone and plastic strain value of surrounding rock decrease. This shows that grouting pre-reinforcement measures have achieved obvious results.
【作者单位】：长安大学公路学院;西安市地下铁道有限责任公司;河南省交通规划勘察设计院有限责任公司;
【基金】：国家自然科学基金资助项目(51008029,51378071) 中央高校基本科研业务费专项资金资助项目(CHD2012ZD019) 长安大学基础研究支持计划专项基金资助项目(CHD2012ZD019)
【分类号】：U455.49

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