Abstract
Addressing urban transport is a very timely matter, especially in the capital Hanoi and Ho Chi Minh City. In order to solve this problem, a solution has been proposed for the construction of overhead tram and subway lines. In fact, when constructing subway lines through historical sites, high population density, many surface structures, etc., the method of open construction is not feasible, it is necessary to use the method Underground construction. These areas are often weak soil, the physical parameters of the soil detrimental to the tunnel construction work; Such as small stickiness, small internal friction angle, high porosity, high permeability coefficient, high water saturation, short shear strength etc. These factors create complex geological conditions in Construction tunnel. With that in mind, the calculation of the selection of the tunnel casing structure is necessary, which is timely.This paper provides a solution to the problem of stress state of multilayer lining supporting the tunnel of circular cross-section, constructed in a technologically heterogeneous array. The tunnel lining and surrounding soil mass are considered as elements of a united deformable system.
Highlights
In order to solve this problem, a solution has been proposed for the construction of overhead tram and subway lines
This paper provides a solution to the problem of stress state of multilayer lining supporting the tunnel of circular cross-section, constructed in a technologically heterogeneous array
The task of calculating multilayer tunnel lining of circular cross-section, constructed in soils simulated by a homogeneous elastic medium, is solved by many authors [1, 2, 4, 9, 15, 17−20]
Summary
The task of calculating multilayer tunnel lining of circular cross-section, constructed in soils simulated by a homogeneous elastic medium, is solved by many authors [1, 2, 4, 9, 15, 17−20]. We write the boundary conditions at the contact lines Li (i=1, 2, ..., N) rings through the additional stresses and displacements in the General form: r1 i 1 r1 i 1,N* r0 i ; ui 1 ui .(4). Use the additional views radial contact stresses as the relevant pressures and introducing new symbols highlight the bolting of two arbitrary adjacent layers, numbered respectively i and i+1 As a result, generalizing the representation (13)−(19) can write a General formula that allows to express all the unknown values pi through p1 in the form: pi Mi p1 Li , (i = 2, ..., N),. (MPa) and the Poisson's ratios of the where N − is the calculated normal force is determined from the first expression (28); NS − ultimate bearing capacity of the radial cross section of the lining defined by the ratio.
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