Settlement of foundations and foundation consolidation techniques
In recent years the problem of crack formation in buildings, due to land subsidence, has also been spreading due to climate change. In fact, therise in temperature, drought, are among the main causes of the appearance of cracks in the walls.
This situation generally occurs when the ground below the house is lowered, because the balance between the ground and the foundation has changed, which guarantees stability and safety over time.
I subsidence of foundations occur due to aalteration of the state of tension in the ground below or also due to a variation in interstitial pressures due for example to a lowering of the aquifer, so it is therefore important to know how to consolidate a soil, one of the most widely used methods is that which uses expanding resin injections in the subsoil or foundation.
To estimate the failure of the house foundations or the foundations of a multi-storey building, it is advisable to verify the depth of the alteration of the tension in the ground becomes negligible, by analyzing the stratigraphic conditions, the initial and final stress state, the stresses and deformations present in the soil over time.
The latter consists of three parts: a solid, a liquid it’s a gaseous. Over time, one of these parts can undergo an anomalous variation due to natural or mechanical causes and therefore the balance between the ground and the foundation can break.
For example, long periods of drought alternating with heavy rains or large sewer leaks change the structure of the soil and can lead to subsidence.
A clayey soil is able to absorb large amounts of water, increasing in volume; in a very hot summer, the water evaporates causing a subsequent decrease in the volume of the soil with the consequent formation of interstitial voids.
If he land is sandy or gravelly, the water circulates freely inside it, displacing the finer solid particles, leaving cavities.
Also in this case they can be had then structural failures.
Other possible causes of failure are the consequence of a intense vehicular traffic, excavation works nearby, growth of roots of tall trees or other disturbances of the foundation soil.
Clay soil consolidation technology and building foundation consolidation with expanding resin injections
The presence of water and climate change are therefore among the causes of possible alterations in the static balance of the ground and consequently the compromise of the stability of the foundation.
The firm GEOSEC® ITALY is able to eliminate these settlements thanks to theinjection of expanding resins that consolidate the ground.
The intervention system SEE&SHOOT® is based on the use of the latest generation of high-tech three-dimensional diagnostic technology, integrated with the mechanical penetrometric test to reconstruct the geological model of the ground under the house, before, during and at the end of the injections.
Sending electric current in the ground by means of small transmitters, its passage into the subsoil is measured. Geosec specialized geologists are able to interpret and correlate all the data collected in the best possible way, case by case.
With the Tomografia ERT 4D LIVE thousands of resistivity measurements are detected for each injection and in this way it will be possible to identify, before the injections, those porous, humid and wet volumes of soil, which are often a contributing cause of the subsidence.
You can also get to know them sewer leaks e stagnant water, leaching of the ground and underground cavities. The measurement of the mechanical resistance of the ground will then be obtained with a penetrometric test, which will be performed in the most significant points indicated by the ERT 4D LIVE Tomography.
From the superimposition of all this information, it will be possible to reconstruct the geological model of the terrain under your home.
So it will be possible to define in detail the injections project and subsequently, keeping the monitoring system in operation, check the results and improvements obtained thanks to the injections.
Improvements obtained thanks to the injections of expanding resin
Following the reconstruction of the three-dimensional geological model of the land, thetargeted consolidation intervention with the injections of expanding resins produces the following improvements:
- reduction e removal of water interstitial from the ground;
- filling voids;
- compaction of the land.
At the base of this technology is the MAXIMA resin®, produced in exclusive for GEOSEC®with components environmentally friendly and certified.
The University of Parma tested resin samples verifying their mechanical characteristics and dimensional stability over time.
The Giordano Institute has verified its perfect environmental compatibility. Each production batch is subjected to a rigorous quality control by a specialized external laboratory.
The MAXIMA resin® and a slow expansion, which permeates well into the voids under the house, acting delicately only where needed. The monitoring system can easily identify the expansion of the resin in the soil, so as to allow targeted injecting, with maximum effectiveness and without waste.
How does the consolidation of GEOSEC buildings take place® Italy
A team specialized in the intervention See & Shoot of Geosec, operates throughout the national territory, equipped for any operational context: confined spaces, underground rooms, are not a problem.
On the spot comes a mobile laboratory for injections, inside which various instruments are installed:
- l’injection system, managed by a computerized system capable of controlling various working parameters;
- l’diagnostic implant monitoring, to reconstruct the geological model of the terrain.
Once the project has been defined, we move on todrilling holes through the foundation, to allow the resin to penetrate where it is needed.
These are small holes made by hand with drills and thin bits half an inch in diameter, really minimally invasive. The holes will be directed precisely towards those volumes of soil that have been found to be the cause of the subsidence.
L’resin injection it will take place cyclically, with short intervals, so as to consolidate the soil delicately.
After crossing the foundation, the resin comes out of the injection tube, spreading into the cavities of the ground at the desired depth. During the injections, the geologist constantly checks, through the ERT 4D LIVE Tomography, the effects obtained until the planned improvements are reached.
The intervention takes place without excavating. Once the operation is complete, the Geosec team definitively seals the holes.
Experience, professionalism, are the foundation of a concrete result.
End of Article
THE EDITORIAL RECOMMENDS
Soil consolidation and foundation reinforcement: how to intervene
Consolidate un foundation soil or consolidating the foundations of a house or building is a rather delicate operation, the brand in the consolidation of foundation soils Geosec®represents a reliable reality where craftsmanship and innovation constantly merge to the benefit of the quality of the proposed solutions.
Further proof of Geosec’s high reliability, after having already obtained prestigious certifications and technical qualifications in Italy and abroad, is added the opportunity of a posthumous insurance guarantee on land and building consolidation interventions which therefore become protected by a double posthumous guarantee:
- GEOSEC contractual guarantee® lasting 10 years
- 10-year Posthumous Insurance Guarantee
The Geosec facility is organized to provide one as needed Full technical assistance, both in the pre-intervention phase and in the post-intervention phase, also having available partnerships for the detection and tracing of underground systems. In the event that the relative technical documentation relating to the building project is no longer available, Geosec supports customers in finding this information with specific tools.
Source: LAVORINCASA.it by www.lavorincasa.it.
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