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1. (WO1986003532) STABILISATION DE LA CIMENTATION AU MORTIER LIQUIDE
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CLAIMS

1. A method of ground stabilisation by jet grouting comprising the steps of:

producing an elongated bore in the ground;

eroding the ground in a radial direction from the bore in a progressive manner from one end of the bore towards the other end thereof and injecting a first grout into the eroded ground and the bore to form a panel;

subsequently inserting a grouting tube into the bore before the first grout therein has solidified, the grouting tube having outlets spaced along its length,

permitting the first grout in the bore to solidify to an extent such that sufficient pressure can be generated in the tube to cause rupture of the solidified grout in the bore;

and supplying a second grout to said tube at or above such pressure to rupture the solidified first grout in the bore and to cause the second grout to permeate the ground adjacent to the panel and to form therewith an enlarged, stabilised volume of ground.

2. A method according to Claim 1 wherein said pressure is generated sequentially in discrete lengths of the grouting tube.

3. A method according to Claim 2 wherein said pressure is limited to said discrete lengths of the grouting tube by the use of a packer which is moved progressively from one end of the grouting tube to the other.

4. A method according to any one of Claims 1 to 3 wherein the ground is eroded and jet grouted from the bore in two opposed or inclined radial directions
simultaneously so as to form a flat or V-shaped panel with the bore substantially in the centre thereof.

5. A method according to Claim 4 wherein two panels are formed in shape of an X with the bore in the centre thereof by repeating the grouting step.

6. A method according to any one of Claims 1 to 3 wherein the panel is formed by eroding the ground between said bore and a second bore parallel to the
first-mentioned bore and wherein the grouting tube is inserted in to either one of the bores and second grout is supplied to said tube in such manner as to permeate the ground adjacent the panel.

7. A method according to Claim 6 wherein a grouting tube is inserted into each bore and second grout is supplied to each of said tubes in such manner as to permeate the ground adjacent to the panel.

8. A method comprising producing a number of panels from first grout and starting from separate bores
according to any one of the preceding claims, arranging the panels in the ground so that the panels intersect to form a substantially continuous structure and then injecting second grout into the ground from at least some of the bores to positions adjacent to said structure to form therewith an enlarged stabilised volume of ground.

9. A method according to Claim 8 wherein the panels are arranged to form an array of continguous tubes which touch where the bores are situated and wherein the second grout is injected into areas on one or both sides of said array.

10. A method according to any one of the preceding claims wherein during production of the or each bore a thixotropic flushing agent is used to remove the spoil and to stabilise the bore.

11. A method according to Claim 10 wherein the flushing agent comprises a mixture of water, bentonite and cement.

12. A method according to any one of the preceding claims wherein the second grout is introduced into the grouting tube at a pressure of between 20 and 50 bar.

13' A method according to any one of the preceding claims wherein the first grout is caused to form the or each panel at a pressure of between 50 and 100 bar.

14. A method according to any one of the preceding claims wherein the ground erosion is effected by a high pressure water jet moving at a speed of between 150 and 250 metres per second.

15. A method of ground stabilisation substantially as hereinbefore described with reference to the accompanying drawings.