Research on the Determination and Law of Formation Seepage Pressure of Slurry Shield Tunnel
The formation seepage pressure in the construction of slurry shield tunnel is one of the main basis for setting construction parame-ters such as slurry pressure in the excavation chamber.In order to improve the accuracy of stratum seepage pressure calculation,the determi-nation method and law of stratum seepage pressure of slurry shield tunnel were studied.Considering the construction elements such as soil ex-cavation,slurry support and grouting behind the wall,a three-dimensional fluid-solid coupling model was established to simulate the dynamic process of slurry shield construction,the disturbance range and disturbance degree of shield construction and stratum conditions such as shield tunneling and synchronous grouting on stratum seepage pressure were analyzed.Based on this,a correction formula for stratum seepage pressure of slurry shield tunnel was proposed.The results show that when the grouting pressure is 200～500 kPa,the farthest influence range of shield tunneling on the formation penetration pressure is 4.5 rings away from the front of the excavation face;under the same grouting pres-sure,the disturbance range of the rock layer is the largest,the disturbance range of the sand layer is the second,and the disturbance range of the clay layer is the smallest;the calculated value of the stratum permeability pressure obtained by the correction formula is basically con-sistent with the measured value trend,which verifies the rationality of the correction formula.
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