Stability and Quality Control of Tunnel Surrounding Rock in Weathered Mudstone Stratum
Mudstone stratum has the engineering characteristics of water-saturated softening and crushing for lacking water.Tunnel construction in mudstone stratum is easy to cause surrounding rock instability,which brings great challenges to construction schedule and construction safety.Firstly,the physical and mechanical parameters of mudstone were obtained through uniaxial and triaxial mechanical tests.Secondly,the monitoring scheme and practicability of infrared water detection and TST advanced geological forecast adopted in the field were analyzed.Then,based on the results of mudstone mechanical test and the support structure of mudstone stratum,the numerical calculation of surrounding rock stability of mudstone tunnel excavation was carried out and the control effect of pipe shed on surrounding rock stability was analyzed.Finally,the stability of surrounding rock was verified and evaluated by monitoring the pressure of surrounding rock and the strain of steel frame.The results show that the pressure of surrounding rock is stable around 20.50 kPa,while the strain of steel frame is about 260.The mudstone formation control measures adopted in the field are effective.The research results can provide reference for the stability control technology of tunnel surrounding rock in mudstone and similar strata.
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