泥水盾构掘进过程中的泥水劈裂现象现场试验研究（英文）

发布时间：2018-02-20 01:18

本文关键词： 现场泥水劈裂试验初始劈裂压力劈裂伸展劈裂伸展压力泥水盾构隧道施工　出处：《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》2014年07期 　论文类型：期刊论文

【摘要】：研究目的:本文通过研究泥水在地层中的劈裂和伸展现象,给出一种地层劈裂抗力的测定方法,从而为泥水盾构掘进过程中泥水压力设定提供参考,防止盾构掘进过程中泥水喷发现象的发生。创新要点:1.给出了地层劈裂抗力的测定方法,并通过现场试验和理论分析得出该方法是可靠的;2.建立了考虑泥水粘性和比重的地层劈裂伸展模型,该模型对现场试验结果有较好的预测;3.结合地层劈裂抗力和泥水劈裂伸展特性给出了盾构掘进过程中泥水压力的设定上限。研究方法:基于现场泥水劈裂试验,通过试验结果分析和理论分析,建立了劈裂压力和劈裂伸展压力的计算模型。通过泥水和地层参数对计算模型的影响分析,给出泥水盾构掘进过程中泥水配比和压力设定选择建议。重要结论:1.本文描述的现场泥水劈裂仪可以用于地层劈裂抗力的测定;2.使用总应力法的劈裂模型能够很好的预测地层的初始劈裂压力;3.考虑泥水粘性和比重的地层劈裂伸展模型对现场试验结果有较好的预测;4.在劈裂伸展的过程中,具有更大比重和粘性的泥水有利于阻止劈裂的进一步伸展,但是对初始劈裂压力的影响不大。5.在实际盾构掘进过程中,泥水劈裂发生后很难阻止其伸展。因此,防止泥水喷发的关键措施在于设定泥水压力上限防止泥水劈裂。
[Abstract]:Objective: by studying the splitting and spreading phenomenon of mud water in the formation, this paper presents a method to determine the formation splitting resistance, which provides a reference for the mud water pressure setting in the mud shield tunneling process. To prevent the occurrence of mud eruption during shield tunneling. The main points of innovation: 1. The determination method of formation splitting resistance is given. Through field test and theoretical analysis, it is concluded that this method is reliable. 2. The formation splitting extension model considering the viscosity and specific gravity of mud water is established. The model can predict the field test results well. The upper limit of mud pressure during shield tunneling is given in combination with formation splitting resistance and mud water splitting extension characteristics. The research method is based on field mud splitting test. Through the analysis of experimental results and theoretical analysis, a calculation model of split pressure and split extension pressure is established. The influence of mud and formation parameters on the calculation model is analyzed. The selection suggestion of mud water ratio and pressure setting during mud shield tunneling is given. The important conclusion is: 1. The field mud water splitting apparatus described in this paper can be used to determine the formation splitting resistance. 2. The split model using total stress method can be used very well. Good prediction of the initial split pressure of the formation 3. The model of formation splitting extension considering the viscosity and specific gravity of mud water has a good prediction for the field test results. 4. In the process of splitting extension, Mud with greater specific gravity and viscosity is beneficial to prevent further extension of splitting, but has little effect on initial splitting pressure. 5. During actual shield tunneling, it is difficult to prevent mud from spreading after splitting occurs. The key to prevent mud eruption is to set the upper limit of mud pressure to prevent mud splitting.
【作者单位】： School
【基金】：Project supported by the National Natural Science Foundation of China(Nos.50878015,51178027,and 51378054)
【分类号】：U455.43

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