EP0019676B1 - Procédé et dispositif pour la consolidation accélérée des sols fins par chargement d'une membrane - Google Patents

Procédé et dispositif pour la consolidation accélérée des sols fins par chargement d'une membrane Download PDF

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Publication number
EP0019676B1
EP0019676B1 EP79400318A EP79400318A EP0019676B1 EP 0019676 B1 EP0019676 B1 EP 0019676B1 EP 79400318 A EP79400318 A EP 79400318A EP 79400318 A EP79400318 A EP 79400318A EP 0019676 B1 EP0019676 B1 EP 0019676B1
Authority
EP
European Patent Office
Prior art keywords
membrane
soil
consolidation
programme
membranes
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP79400318A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0019676A1 (fr
Inventor
Jean-Marie Cognon
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Techniques Louis Menard Francaise SA
Original Assignee
Techniques Louis Menard Francaise SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Techniques Louis Menard Francaise SA filed Critical Techniques Louis Menard Francaise SA
Priority to AT79400318T priority Critical patent/ATE12131T1/de
Publication of EP0019676A1 publication Critical patent/EP0019676A1/fr
Application granted granted Critical
Publication of EP0019676B1 publication Critical patent/EP0019676B1/fr
Expired legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
    • E02D3/02—Improving by compacting
    • E02D3/10—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains

Definitions

  • the invention relates to the consolidation of fine soils (silts, silt, clay), that is to say the compaction of these soils and the elimination of water from the soils, in particular to make them suitable for supporting structures or charges.
  • the object of the invention is to bring about an accelerated consolidation of clayey or silty materials, the low permeability of which usually requires long periods of consolidation, while avoiding the use of preloading embankments and the movements of earth which result therefrom, while taking into account soil reactions.
  • the method of consolidation, according to the invention, of fine soil (silts, silt, clay) by loading a membrane comprising a simultaneous drainage for discharging the consolidation water is characterized in that the soil is subjected to a loading program comprising loads alternating with discharges.
  • the implementation of the invention preferably includes the use of flexible membranes which will load the soil by applying a total vertical or horizontal stress depending on the case.
  • total stress it means that the loading applies both to the grains of the ground and to the water which is in the ground, whereas a direct loading by a fluid without membrane only pressurizes the interstitial water .
  • dilatable cylindrical membranes are used which are pressurized by means of a fluid.
  • membranes are used that are arranged horizontally on the ground, preloaded by applying a vacuum.
  • a cylindrical expandable membrane 1 is placed vertically in a hole 2 and then pressurized by means of a fluid to load the ground horizontally ( Figure 1).
  • the distribution in plan of the dilatable membranes and the vertical drains is function of the ground and the first tests.
  • membranes 1 are regularly distributed in the homogeneous parts of the ground and a plurality of drains 3 are regularly arranged between the membranes.
  • Figure 2 shows an example.
  • a membrane is made up of a resistant sheath (woven or non-woven material) associated with an interior sealing membrane. Sealing can also be ensured by coating the resistant sheath.
  • Reinforcements at different vertical levels are used, if desired, to take account of variations in the resistance of certain soil layers. It is thus recommended to place corsets around the membrane when hard layers pass or to neutralize the first meter of land in order to prevent the ground from rising.
  • the membrane is put in place by beating or vibro-driving (or other method) of a hollow mandrel inside which it is located ( Figures 5 and 6); at the lower end, the membrane is attached to a shoe 5 which will prevent it from rising when the mandrel is removed.
  • the operation of the assembly is similar to that of a drain machine.
  • the membrane (type a) is flat or bellows in the mandrel which preferably has an H shape ( Figure 6) and then in the ground. This makes it possible to limit as much as possible the reworking of the soil during threshing (by the shape of the resulting mandrel) and to have maximum efficiency at the time of inflation.
  • a thin draining layer 11 (maximum 50 cm) is deposited or is already on the ground to be consolidated, then covered with a waterproof membrane 6 (Figure 7).
  • a network of drains 8 is arranged under the membrane, for example vertically, as necessary.
  • the vertical (or horizontal) membrane is subjected to a loading program which includes times when the membrane is actually loaded by pressure (or depression) separated by times when the pressure (or depression) is reduced or eliminated.
  • the cycle is regular or irregular.
  • Figures 9 and 10 relate to an example of implementation of the forced radial consolidation process on a clay soil sample in a dynamic oedometer tank (with radial drainage) and respectively represent the variation over time of the pressure of loading and variation over time of water expelled from the sample.
  • the vertical membranes are removed and the holes thus cleared are filled with a hard material to constitute piles, if desired.

Landscapes

  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Soil Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Agronomy & Crop Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
  • Excavating Of Shafts Or Tunnels (AREA)
  • Soil Working Implements (AREA)
EP79400318A 1979-05-11 1979-05-21 Procédé et dispositif pour la consolidation accélérée des sols fins par chargement d'une membrane Expired EP0019676B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT79400318T ATE12131T1 (de) 1979-05-11 1979-05-21 Verfahren und vorrichtung zur beschleunigten verdichtung feinkoerniger boeden durch belastung einer membrane.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7911982A FR2456168A1 (fr) 1979-05-11 1979-05-11 Procede et dispositif pour la consolidation acceleree des sols fins par chargement
FR7911982 1979-05-11

Publications (2)

Publication Number Publication Date
EP0019676A1 EP0019676A1 (fr) 1980-12-10
EP0019676B1 true EP0019676B1 (fr) 1985-03-13

Family

ID=9225341

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79400318A Expired EP0019676B1 (fr) 1979-05-11 1979-05-21 Procédé et dispositif pour la consolidation accélérée des sols fins par chargement d'une membrane

Country Status (4)

Country Link
EP (1) EP0019676B1 (enrdf_load_stackoverflow)
AT (1) ATE12131T1 (enrdf_load_stackoverflow)
DE (1) DE2967404D1 (enrdf_load_stackoverflow)
FR (1) FR2456168A1 (enrdf_load_stackoverflow)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI68876C (fi) * 1981-12-17 1985-11-11 Pohjavahvistus Oy Foerfarande och anordning foer bildande av en vertikaldraen i otten av ett vattendrag
FR2663373B1 (fr) * 1990-06-18 1993-05-28 Cognon Jean Marie Procede et dispositif pour etablir une depression dans une zone de terrain permeable isolee de l'atmosphere par une membrane etanche.
GB2354021A (en) * 1999-09-11 2001-03-14 Richard Smalley Airbag brace for shoring a grave

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2615307A (en) * 1947-05-06 1952-10-28 Kjellman Walter Method of consolidating soils
FR1047824A (fr) * 1950-06-17 1953-12-17 Procédé pour la tension initiale du sol, en particulier dans le sens horizontal
FR1541679A (fr) * 1966-05-23 1968-10-11 I C O S Impresa Costruzioni Op Procédé pour le renforcement et la stabilisation des sols compressibles
FR2178305A5 (enrdf_load_stackoverflow) * 1972-03-27 1973-11-09 Compactage Travaux Speci
FR2205908A5 (enrdf_load_stackoverflow) * 1972-11-03 1974-05-31 Menard Louis

Also Published As

Publication number Publication date
FR2456168B1 (enrdf_load_stackoverflow) 1983-11-10
ATE12131T1 (de) 1985-03-15
FR2456168A1 (fr) 1980-12-05
DE2967404D1 (en) 1985-04-18
EP0019676A1 (fr) 1980-12-10

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