泥岩地层由于含泥量高,土压平衡盾构掘进时极易发生结泥饼故障。通过改装的直接剪切仪,考虑温度影响对泥岩渣土样开展界面切向黏附强度试验,探讨了黏附强度的增长规律。分析了不同盾构掘进参数下刀盘对开挖面土体挤压作用及界面黏附强度的影响,结合泥岩自身的抗剪强度,提出了刀盘结泥饼的发生条件,建立了盾构掘进参数对刀盘结泥饼的影响分析模型。根据该分析模型得到土压平衡盾构掘进时结泥饼的临界贯入度。结果表明:以黏土抗剪强度与黏附强度为指标建立的刀盘结泥饼风险的判断模型具有一定合理性;黏土的黏附强度随着贯入度增加、开口率减小、埋深增加呈现线性增大趋势;针对南京地铁6号线,盾构掘进的临界贯入度应控制在1.9 cm/r以下。研究成果可为土压平衡盾构结泥饼预防提供指导。
Due to the high mud content in the mudstone strata, the mud cake is easy to occur in earth pressure balance shield excavation. Through the improved direct shear apparatus, the interface tangential adhesion strength test was carried out on the mudstone slag sample considering the influence of temperature, and the growth law of adhesion strength was discussed. The influence of cutterhead on soil extrusion and interface adhesion strength of excavation face under different shield tunneling parameters is analyzed. Combined with the shear strength of mudstone, the analysis model of the occurrence conditions of the cutterhead mud cake and the influence of shield tunneling parameters on the cutterhead mud cake are proposed. According to the analysis model, the critical penetration of mud cake during EPB shield tunneling is obtained. The results show that: The shear strength and adhesion strength of clay are used as indicators to establish a judgment model for the risk of mud cake formation on the cutterhead, which has certain rationality; The adhesion strength of clay increases linearly with the increase of penetration, the decrease of opening rate and the increase of buried depth; For Nanjing Metro Line 6, the critical penetration of shield tunneling should be controlled below 1.9 cm/r. The research results can provide construction guidance for the prevention of mud cake in EPB shield.
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