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断层破碎段敞开式TBM卡机导洞法脱困处理技术研究
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作者 刘强 《中文科技期刊数据库(全文版)工程技术》 2024年第6期0173-0178,共6页
云南某铁路隧道工程采用敞开式TBM施工,在掘进过程中遭遇不良地质段,刀盘前方围岩发生垮塌,坍塌体呈松软泥沙状,掘进扭矩增大,推进困难,TBM被困。为使TBM脱困并恢复掘进,首先开展TSP、HSP、超前地质钻孔并结合原始地勘资料,研判前方地... 云南某铁路隧道工程采用敞开式TBM施工,在掘进过程中遭遇不良地质段,刀盘前方围岩发生垮塌,坍塌体呈松软泥沙状,掘进扭矩增大,推进困难,TBM被困。为使TBM脱困并恢复掘进,首先开展TSP、HSP、超前地质钻孔并结合原始地勘资料,研判前方地质条件,充分预估风险,之后通过注浆固结盾体周边松散破碎的围岩,然后在盾壳上方施做小导洞并逐步扩挖,利用小导洞空间施做管棚加固围岩,最后清除刀盘及盾体周边渣体,最终使TBM安全脱困,迅速恢复施工。 展开更多
关键词 铁路隧道 松软围岩 化灌加固 导洞 管棚 掏渣 脱困
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Stress variation of soil surrounding tunnel and grouting reinforcement effect based on stress release 被引量:1
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作者 张印涛 陶连金 +1 位作者 王沛霖 边金 《Journal of Coal Science & Engineering(China)》 2007年第1期8-12,共5页
With FLAC, a criteria of stress release ratio (SRR), i.e., about 10% of the relative difference of the ground settlement before and after the supporting system is installed, is incorporated into stress release meth... With FLAC, a criteria of stress release ratio (SRR), i.e., about 10% of the relative difference of the ground settlement before and after the supporting system is installed, is incorporated into stress release method (SRM). At the same time, the Mohr-Coulomb Criterion is used to analyze stress changes around the tunnel induced by excavation. It shows that the surrounding soil around shallow tunnels can be partitioned by loosened zones (unloading zones) and plastic zones among which the shear stresses in the soil are less than 10 kPa below the M-C yield line. Both types of zones are separated. With the increasing of the SRR, the areas of plastic zones and loosen zones gradually increase. The surrounding soil is equally divided into 24 regions in order to study the influence of different grouting regions on the ground settlement. The reinforcing effect of grouting can be modeled by enhancement of the soil strength around the tunnel. By the approach of the SRM, numerical analysis indicates that, in the upper area (top of the surrounding soil about 210°), the reinforcing effect gradually decreases as the reinforcing region moves from arch springing to the vault of the crown; when reinforcing regions lie in the upside of the surrounding soil, the influence on the ground settlement is generally greater than in the lower part; at the same time, with the increase of the SRR, the influential differences are more and more obvious. 展开更多
关键词 stress release plastic zone loosen zone SETTLEMENT FLAC
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