Abstract
The thrust hydraulic system is likely to suffer from an impact load when the shield tunneling machine is excavating through the unexpected geological stratum.In order to solve this problem,the compliance of a thrust hydraulic system and related evaluating values were proposed.The compliance process of the thrust hydraulic system to sudden load was illustrated.Four influential factors of the system compliance were investigated,including fluid bulk modulus,pressure valve parameters,pipeline length and accumulator volume.The evaluation method of the thrust hydraulic system operating under the specified geological condition was proposed based upon compliance index.A case study was carried out by evaluating the compliance of two typical types of existing thrust hydraulic systems under a given geological condition quantitively.Results showed that the compliance of the system with flow control valve is better than that with pressure reduced valve,and the compliance index is improved from 1.08 to 1.27.The compliance and its evaluation method will be helpful to design a compliance based thrust hydraulic system for shield tunneling machine.
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