Calculation of sectional linings for collector tunnels in an underworked soil mass
Existing methods of calculating underground structures in the zone influenced by mining operations do not fully reflect the characteristic features of the performance of collector tunnels build by the shield method at a shallow depth. Thus, methods of calculating the bracing for mine workings fail to account for the effect of the closeness of the ground surface, while the method of calculating structures embedded in the ground fails to account for the stress state of the soil mass that embeds the lining. Moreover, these methods address the calculation of the lining only for the compression modulus of the mass. The method of calculation, which is proposed below in the development of (4) is based on approximate solution of the contact problem of the interaction between the lining and soil both in the zones of tensile (+{var_epsilon}{sub x}) and compressive (-{var_epsilon}{sub x}) strains. Modeling with respect to a discrete computational scheme of the stress state of the mass being underworked is a characteristic feature of the method. In zones of tensile deformations, the lining is calculated for the total stresses in the mass, which is equal to the sum of the initial stresses dictated by its own weight, and additional stresses cause by mining operations. 5 refs., 3 figs.
- OSTI ID:
- 149598
- Journal Information:
- Soil Mechanics and Foundation Engineering, Vol. 28, Issue 4; Other Information: PBD: Jan 1992; TN: Translated from Osnovaniya, Fundamenty i Mekhanika Gruntov; No. 4, 19-21(Jul-Aug 1991)
- Country of Publication:
- United States
- Language:
- English
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