Which of the following are key principles of support designs in tunnelling projects?

A. When full ground strength is mobilized, groud will yield, and collapse will occur.

B. Lining helps to carry part of the stresses, equilibrium occurs when ground pressure is balanced by support pressure

C. During the support design, we allow groud to naturally arch and carry some of the stresses.

Яка мета методу «Зворотне планування»?

Consider a clay soil where the water table is 0.5 m below the ground surface. At 5 m depth, the raw SPT value obtained was N (N>15). After the first correction, standard penetration value is equal to

In the Standard Penetration Test (SPT), the split spoon sampler penetrated into the soil stratum. ------ mass is dropped  from ------- height to make one blow on the SPT spoon.

The correct answers to fill the blanks, respectively are:

The number of blows for SPT will be

Sobre el objetivo general:

Sobre los antecedentes:

Los componentes de la hipótesis son: