Method for designing and forming a retaining wall in the ground, and retaining wall

1 . A method for designing and forming a retaining wall in the ground having a required target wall stiffness, comprising

a soil-based mortar, which is produced in the ground by mixing soil material and a cement suspension, and

vertically aligned support beams, which are positioned in the soil-based mortar and arranged therein, wherein the arrangement of the support beams is designed to have an overall beam stiffness,

wherein

the support beams are arranged such that the laid-out overall beam stiffness is less than the required target wall stiffness, and

when designing and arranging the support beams, an additional stiffness component is added that results from at least one adjacent wall section made of soil-based mortar, the additional stiffness component M c,d on a support beam is determined by the at least one adjacent wall section made of soil-based mortar in accordance with the formula:

M

c

,

d

=

D

c

,

d

×

e

c

,

d

,

where: D c,d =A c,x ×0.85×f cd where: f c,d =a c ×f m,k : Υ M and

where:

D c,d is the design compressive force of the soil-based mortar;

the index c (concrete) denotes a variable that is associated with the soil-based mortar;

the index d (design) denotes a rated variable, i.e., during the determination, corresponding partial safety factors were taken into account; and

the index x relates to the concrete compressive zone, i.e., here, to the compressive zone of the soil-based mortar.

2 . The method according to claim 1 ,

wherein no additional reinforcement elements are introduced into the soil-based mortar other than the support beams.

3 . The method according to claim 1 ,

wherein steel beams, in particular having a C profile, an H profile or an I profile, are positioned as support beams.

4 . The method according to claim 1 ,

wherein the support beams are kept free of connecting elements to the soil-based mortar.

5 . The method according to claim 1 ,

wherein the overall beam strength M R,d results from the formula:

M

R

,

d

=

∑

D

i

,

d

×

e

i

,

z

=

D

c

,

d

×

e

c

,

d

+

D

s

,

d

×

e

s

,

d

+

Z

s

,

d

×

e

s

,

z

,

where M R,d ≥M E,d and

the index designates a variable that is associated with the partial cross section of the support beam;

the index R represents resistance;

the index E represents effects;

M designates moments;

D designates compressive forces and Z designates tensile forces; and

e is the inner lever arm.

6 . The method according to claim 1 ,

wherein

a cut trench is formed in the ground by cutting, wherein removed soil material is processed in the cut trench by supplying a cement suspension and mixing it therewith to the soil-based mortar.

7 . The method according to claim 1 ,

wherein

a borehole is formed in the ground by boring, wherein removed soil material is processed in the borehole by supplying a cement suspension and mixing it therewith to the soil-based mortar.

8 . The method according to claim 7 ,

wherein,

for forming the retaining wall, a plurality of boreholes are formed beside one another in the ground by boring.

9 . A retaining wall in the ground, which in particular is formed according to a method according to claim 1 , having a required target wall stiffness, comprising a soil-based mortar, which is produced in the ground by mixing soil material and a cement suspension, and vertically aligned support beams, which are positioned in the soil-based mortar and arranged therein to form the retaining wall, wherein the arrangement of the support beams is laid-out to have an overall beam stiffness,

wherein

the support beams are arranged such that the laid-out overall beam stiffness is less than the required target wall stiffness, and

in that the support beams are laid-out and arranged to have an additional stiffness component that results from at least one adjacent wall section made of soil-based mortar.

10 . The retaining wall according to claim 9 ,

wherein

the retaining wall is configured to be annular to form an excavation enclosure.