RU1788995C - Artificial base - Google Patents

Abstract

Usage: the construction of the foundations of buildings and structures on soft soils. SUMMARY OF THE INVENTION: a base made of strong discrete granular soil is provided with a flexible layer made in the form of a grid, which is located in its lower part at a depth of not less than half its thickness and anchored at the ends. The width of the HRV grid is equal to the width of the stress zone of the base in its middle part, the width of the artificial base Вшах is equal to the width of the stress zone, and the thickness of the artificial base Н is determined from the formulas (1 + e) K -0.5N, where HRV is the width of the stress artificial zone of the living area; b is the width of the foundation; e is the base porosity coefficient; K is the distribution coefficient of the artificial base, p is the angle of internal friction of the base soil; tg p is the coefficient of the internal tray Н ЈЈ (1 + е) КН. 1 IL. neither; tgp

Description

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WITH

The invention relates to construction, and in particular to building structures, for example, artificial foundations of buildings erected on soft soils.

An artificial base is known, which is an embankment of strong discrete granular soil with layer-by-layer mesh reinforcement.

Building constructions are known from reinforced, non-bonded soil with reinforcing bars that are longitudinally longitudinal with respect to the acting forces, and to maintain a free surface it is covered with clothing, for example, in a U-shaped section.

The aim of the invention is to increase the bearing capacity of the artificial base while reducing the material consumption of the foundations.

This goal is achieved in that in a well-known artificial base of durable

discrete granular soil with a thickness equal to the height of a compacted soil core reinforced with a flexible layer, the latter is made in the form of a grid, which is located in the lower part of the base at a depth of not less than half of its thickness, intersecting the sliding plane of the core and anchored at the ends in the stressed zone of the base beyond the borders core, and the width of the Ver mesh is equal to the width of the stress zone of the base in its middle part, the width of the artificial base Вшах is equal to the width of the stress zone at the lower boundary, in contact with the spreading layer and the thickness of the artificial base H are determined from the formulas

Abs B-K1 + e) -K -0.5H. where Ver is the width of the stress zone of the artificial base;

b is the width of the foundation;

vi

00

since y eat

with

e is the porosity coefficient of the artificial base;

K is the distribution coefficient of artificial base soil equal to 2tg;

 - coefficient of internal friction;

p is the angle of internal friction of the artificial base soil;

n 0.5b

(1 + e) KH,

The inventive step of the proposed technical solution is confirmed by the parameters of the artificial base, the interconnection with it and the relative position of the mesh in it.

The drawing shows the construction of the artificial base according to the invention, made of durable, non-bonded granular soil or mesh reinforced material.

The artificial foundation foundation 1 is formed of strong granular soil (material) 2 reinforced with a flexible layer in the form of a mesh 3, which is located in the lower part of the base at a depth of not less than half its thickness H, and the width of the net HRV is equal to the width of the stress zone of the artificial base in the middle parts of it, the grid itself, intersecting the slip plane of the wedge-shaped core 5, are pinched by the vertical pressure P acting on sections 6 and 7 of the stress zone 4 outside the core, while nor limited by the presence of the weak soil layer 8 in the underlying natural base, and the width constrained area and thickness are determined from formulas

(1 + e) -K -0.5H, where HBr is the width of the stress zone of the artificial base;

b is the width of the foundation;

e is the porosity coefficient of the soil of the artificial base;

K is the distribution coefficient of the artificial base, equal to 2;

tg (p is the coefficient of internal friction;

(p is the angle of internal friction of the artificial base soil;

and -0.5b

(1 + e) KH,

The uniformly distributed axisymmetric load P from the building through the foundation 1 is transferred to the surface of the soil 2 of the artificial base, forming the stress zone 4, while the load in the artificial base is distributed so

that when a granular medium reaches its maximum density, part of the stress zone - core 5 under the foundation 1 acquires the shape of a wedge with an angle of 2 p at the apex, at any point of which the stresses are

between each other and equal to the maximum pressure acting on the surface of the base, the sides of the wedge are sliding planes at ultimate load and loss of stability by the base, and the sum of stresses in core 5 is the sum of the stresses in adjacent sections 6 and 7 of zone 4. Upon reaching With a load Р of a critical value Ркр the foundation 1 with the core 5 begins to sink into the weak soil of the underlying

layer of natural base 8. At this moment, mesh 3 with a design cross-section corresponding to pulling out its force from sections 6 and 7, which prevents the foundation with the core from sinking into soft ground, is put into operation.

The proposed design of the artificial base increases the bearing capacity of the artificial base by 8-10 times and reduces material consumption by 2

times.

Claims (1)

SUMMARY OF THE INVENTION An artificial base made of strong discrete granular soil under a foundation, reinforced with a flexible layer, characterized in that, in order to reduce the base sediment, reduce material consumption, while increasing the bearing capacity of the base, the flexible layer is made in the form of a mesh, which is located in the lower part of the base at a depth of not less than half of its thickness and anchored at the ends, the width of the mesh VSp being equal to the width of the stress zone of the base in its middle part, the width of the lash of the artificial base is equal to the width of the stress zones, and the thickness H of the artificial base, are determined from the formulas (1 + e) K -0.5H, where VSr is the width of the stress-zone of the artificial base; b is the width of the foundation; e is the porosity coefficient of the artificial base; K is the distribution coefficient of the artificial base, f is the angle of internal friction of the artificial base soil; tgy is the coefficient of internal friction; n 0.5 b Bmax4b + (1 + e) KH.