盾构掘进过程中防止泥水劈裂的泥水压力设定

发布时间：2018-04-24 14:47

本文选题：地层劈裂抗力 + 现场泥水劈裂仪　；参考：《土木工程学报》2014年05期

【摘要】：泥水盾构掘进过程中,泥水压力是其重要的掘进参数。特别是在过江越海隧道修建过程中,泥水压力设定不当易发生泥水劈裂、喷发到江底引发江水倒灌等工程事故,如Heinenoord第二隧道。为防止泥水劈裂的发生,结合已有研究成果给出了地层劈裂抗力的估算方法、测定原理和现场测定方法。讨论了控制泥水压力、提高隧道上覆土层强度、增加隧道覆土厚度和提高泥水的黏性和比重等防止泥水劈裂的方法,并指出控制泥水压力具有实时、有效和经济的特点。在此基础上,结合工程施工中的一般条件和特殊条件,对泥水压力的设定范围进行了研究。研究结果表明:①一般掘进条件下,使用地层静止土压力作为泥水压力的设定上限是安全的,不会发生泥水劈裂地层现象。②在盾构穿越建筑物等超载条件下,由于局部超载的存在导致其泥水支护压力增加,此时可以运用地层劈裂抗力的余量,适当提高泥水容重和支护压力。③在特殊情况下,如盾构带压换刀等,需要提高泥水压力时,宜使用所提供的现场泥水劈裂仪对地层的劈裂抗力进行精确测定后设定泥水压力上限。
[Abstract]:In the process of mud shield tunneling, mud pressure is an important driving parameter. Especially in the process of construction of the tunnel across the river and sea, the improper setting of mud pressure will easily lead to mud splitting, and erupt to the bottom of the river and cause engineering accidents such as water pouring down the river, such as the second tunnel of Heinenoord. In order to prevent the fracturing of mud water, the method of estimating the resistance of formation splitting, the measuring principle and the method of field measurement are given in combination with the existing research results. The methods of preventing mud fracturing such as controlling mud pressure, increasing the strength of overlying soil layer, increasing the thickness of overlying soil and increasing the viscosity and specific gravity of mud water are discussed. It is pointed out that the control of mud pressure has the characteristics of real time, efficiency and economy. On this basis, combined with the general and special conditions in engineering construction, the setting range of mud water pressure is studied. The results show that it is safe to use static earth pressure of formation as the upper limit of mud water pressure under the general heading condition of 1: 1, and the phenomenon of mud water splitting will not occur under overload conditions such as shield tunneling through buildings, etc. Due to the existence of local overload, the mud water support pressure is increased. At this time, the residual amount of formation splitting resistance can be used to properly increase the bulk density of mud and the support pressure .3 under special circumstances, such as shield belt pressure change knife, etc. When it is necessary to raise the mud water pressure, the upper limit of the mud water pressure should be set by using the on-site mud water fracturing apparatus to accurately measure the formation splitting resistance.
【作者单位】：北京交通大学;
【基金】：国家自然基金面上项目(50878015,51378054)
【分类号】：U455.43

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