CAJ | 학술논문

大直径、长距离顶管施工常通过注浆形成泥浆套来减小阻力，泥浆套的形态及其完整性对管壁摩阻力大小有决定性作用，现有摩阻力计算公式一般未考虑不同泥浆套形态对摩阻力的影响，计算结果与实际情况相差较大。根据不同施工状况对顶管外壁泥浆套的可能形态进行了分类及成因分析，提出了判断3种常见泥浆套形态的方法。利用半无限弹性体中柱形圆孔扩张理论探讨了注浆压力对泥浆套厚度的影响，结合非线性流体力学计算泥浆与管壁接触产生的摩阻力，最终采用挖掘面稳定假设，针对3种泥浆套形态提出了摩阻力计算公式。采用该方法对工程案例进行计算，计算结果与实测数据对比表明：现有摩阻力计算公式的计算结果过于保守，所提出的计算公式是合理和有效的。
대직경、장거리정관시공상통과주장형성니장투래감소조력，니장투적형태급기완정성대관벽마조력대소유결정성작용，현유마조력계산공식일반미고필불동니장투형태대마조력적영향，계산결과여실제정황상차교대。근거불동시공상황대정관외벽니장투적가능형태진행료분류급성인분석，제출료판단3충상견니장투형태적방법。이용반무한탄성체중주형원공확장이론탐토료주장압력대니장투후도적영향，결합비선성류체역학계산니장여관벽접촉산생적마조력，최종채용알굴면은정가설，침대3충니장투형태제출료마조력계산공식。채용해방법대공정안례진행계산，계산결과여실측수거대비표명：현유마조력계산공식적계산결과과우보수，소제출적계산공식시합리화유효적。
Mud screen is formed to reduce the jacking friction in long-distance and large-diameter pipe jacking; the form and wholeness of mud screen determine the lateral friction resistance for pipe-jacking;the existing formulae of lateral friction resistance do not take account of the effect of different forms of mud screen;there are large differences between the calculation results and the actual friction resistance. The possible forms of mud screen are classified and analysed based on different construction conditions;the method for determining the forms of mud screen is presented. The influence of the injecting pressure on the thickness of mud screen is discussed;the lateral friction resistance caused by mud slurry is calculated using nonlinear fluid mechanics. Finally, a formula of lateral friction resistance for pipe jacking with different forms of mud screen is put forward using the assumption of stable mining face. The new calculation method is used in an engineering case;the calculation results are compared with the measured data;it is shown that the existing formulae are conservative and the formula of this article is more reasonable.