Based on the consideration of the performance, disaster prevention, relief and tunnel drainage requirement, the connected aisle becomes more and more important to the shield tunnel section with the construction of large quantities of shield tunnels. The construction mechanical behavior of the connected aisle is complex and difficult to simulate with exist method sometimes. In allusion to the numerical simulation of the construction mechanical behavior of the connected aisle in the shield tunnel which is built in the sandy strata with the high hydraulic pressure, a new calculation approach is put forward. The core idea is the coupling use of the stratum structure method and the load structure method. The new method is used in the construction mechanical behavior study of the connected aisle which is built in the shield tunnel across the Yangtze River in Wuhan subway. Some conclusions are drawn and some related advices are proposed based on the analysis of the numerical simulation.