Abstract The Terzaghi soil arching theory has been widely used in force calculations for tunnel structures, howev? er, the theoretical explanation and experimental verification are not sufficient regarding the calculation width, lateral pressure coefficient and frictional coefficient, as well as for the soil arching pattern involved in the Terzaghi formula.Moreover, the technicians are not quite clear about the physical meaning of model parameters, and the selection of parameters is not accurate enough. In this context, the physical meaning of such parameters as the calculation width,lateral pressure coefficient and frictional coefficient, as well as the soil arching pattern, are analyzed here in detail,and the effect of parameters on the calculation results for soil pressure is presented based on a comparison of different parameters. The analysis shows the calculation width and soil arch pattern have a large impact on soil pressure,and the calculation width and soil arch pattern should be chosen based on measured data, or a wider calculation width and more conservative soil arch pattern should be taken when the scope of construction disturbance is relatively large; it is safer to choose active soil pressure coefficent; the friction angle also has a large impact on soil pressure; and it is recommended that the critical friction angle or half of the critical friction angle should be used to conduct the calculation.
Abstract：
The Terzaghi soil arching theory has been widely used in force calculations for tunnel structures, howev? er, the theoretical explanation and experimental verification are not sufficient regarding the calculation width, lateral pressure coefficient and frictional coefficient, as well as for the soil arching pattern involved in the Terzaghi formula.Moreover, the technicians are not quite clear about the physical meaning of model parameters, and the selection of parameters is not accurate enough. In this context, the physical meaning of such parameters as the calculation width,lateral pressure coefficient and frictional coefficient, as well as the soil arching pattern, are analyzed here in detail,and the effect of parameters on the calculation results for soil pressure is presented based on a comparison of different parameters. The analysis shows the calculation width and soil arch pattern have a large impact on soil pressure,and the calculation width and soil arch pattern should be chosen based on measured data, or a wider calculation width and more conservative soil arch pattern should be taken when the scope of construction disturbance is relatively large; it is safer to choose active soil pressure coefficent; the friction angle also has a large impact on soil pressure; and it is recommended that the critical friction angle or half of the critical friction angle should be used to conduct the calculation.
.Problems with the Calculation of Forces Applied to Tunnels Based on the Terzaghi Soil Arching Theory[J] MODERN TUNNELLING TECHNOLOGY, 2017,V54(2): 55-60
2017, Vol. 54 