Synchronous single-liquid grouting slurry, its technology and application for large diameter shield engineering under water-rich, high-pressure and weak soil strata conditions

12187,646

18/089572

December 28, 2022

A synchronous single-liquid grouting slurry, its technology and application for large diameter shield engineering under water-rich, high-pressure and weak soil strata conditions, comprising raw materials: 1050-1200 parts of gold tailing, 420-480 parts of silicate cement clinker, 220-240 parts of fly ash, 45-120 parts of waste clay brick, 65-95 parts of slag, 25-45 parts of limestone tailing, 70-80 parts of steel slag, 30-45 parts of silica fume, 15-22 parts of desulfurized gypsum, and 9-15 parts of quick-setting and early-strength composite additive. The invention controls the d50, d85 and d95 of the material particles as 35-40, 42-48 and 50-55 μm, respectively. Gold tailing with the particle size of 120-600 μm being used as the fine aggregate, their volume fractions are 40-60%. The slurry production technique, comprising crushing-sieving-superfine ball milling-homogenization-particle size classification-variable speed mixing being developed. The shield tail eight-point grouting technique is being developed for filling.

Ocean University of China (Shandong, CN); China Railway 14th Bureau Group Corporation Limited (Shandong, CN); China Railway 14th Bureau Group Shield Engineering Coporation Limited (Suzhou, CN)

Ocean University of China (Shandong, CN), China Railway 14th Bureau Group Corporation Limited (Shandong, CN), China Railway 14th Bureau Group Shield Engineering Coporation Limited (Jiangsu, CN)

1. A synchronous single-liquid grouting slurry for large diameter shield engineering under water-rich, high-pressure and weak soil strata conditions, comprising the following weights of raw materials: 1050-1200 parts of gold tailing, 420-480 parts of silicate cement clinker, 220-240 parts of fly ash, 45-120 parts of waste clay brick, 65-95 parts of slag, 25-45 parts of limestone tailing, 70-80 parts of steel slag, 30-45 parts of silica fume, 15-22 parts of desulfurized gypsum, and 9-15 parts of quick-setting and early-strength composite additive, wherein the quick-setting and early-strength composite additive comprises the following weight percents of raw materials: 30-35% of calcium formate, 30-35% of triethanolamine, 15-20% of sodium aluminate, 10-15% of calcium nitrite; wherein the gold tailing comprises a gold tailing I with a maximum particle size d max of particles less than 120 μm, and a gold tailing II with a particle size between 120-600 μm, and a volume fraction of the gold tailing II is about 40-60% in the total volume of the slurry.

2. The synchronous single-liquid grouting slurry according to claim 1 , wherein after crushing, sieving, premixing, superfine ball milling, second homogenization treatment, particle sizes of d 50 , d 85 and d 95 of the silicate cement clinker, the fly ash, the waste clay brick, the slag, the limestone tailing, the steel slag, the silica fume, the desulfurization gypsum are 35-40 μm, 42-48 μm and 50-55 μm, respectively.

3. A preparation process for the synchronous single-liquid grouting slurry for large diameter shield engineering under water-rich, high-pressure and weak soil strata conditions according to claim 1 , comprising: (1) the silicate cement clinker, the steel slag, the waste clay brick, the slag and the limestone tailing being crushed separately, then being ball-milled until a maximum particle size being less than 120 μm, and then the required materials being weighed and mixed for later use; (2) the gold tailing being sieved to obtain gold tailing I with maximum particle size d max less than 120 μm and gold tailing II with a particle size ranging of 120-600 μm, the gold tailing being weighed according to that a proportion of gold tailing II is 40-60% of a total volume of the slurry for later use; (3) the fly ash, the silica fume and the desulfurization gypsum being sieved so that their maximum particle sizes being less than 120 μm, and then being weighed and mixed for later use; (4) a mixture in step (1), the gold tailing I with the maximum particle size d max less than 120 μm in step (2) and a mixture in step (3) being mixed uniformly, and then being ball-milled until the d 50 , d 85 and d 95 of the material particles are 35-40, 42-48 and 50-55 μm, respectively, and a mixing group I being obtained; (5) the calcium formate, the triethanolamine, the calcium nitrite and the sodium aluminate being weighed according to a proportion, being mixed and dissolved in water at 200-300 r/min for at least one minute, and a mixing group II being obtained; (6) the mixing group I and the mixing group II being mixed in a ratio of water-binder ratio (w/b) of 0.8:1-1.5:1, and then the mixtures being mixed at a stirring speed of 1000-1500 r/min for at least 5 minutes; (7) gold tailing II with the particle size range of 120-600 μm being added to the mixture in step (6), being stirred at the speed of 500-800 r/min for at least 4 minutes, then a stirring speed being adjusted to 1000-1500 r/min for at least 1 minute to obtain a synchronous single-liquid grouting slurry for large diameter shield engineering under water-rich, high-pressure and weak soil strata conditions.

4. The preparation process according to claim 3 , wherein in step (6), the slurry is stirred at a stirring speed of 1000-1500 r/min for 5-10 minutes.

5. The preparation process according to claim 3 , wherein in step (7), the slurry is stirred at a stirring speed of 500-800 r/min for 4-6 minutes and at a stirring speed of 1000-1500 r/min for 1-5 minutes.

6. An application of the synchronous single-liquid grouting slurry for large diameter shield engineering under water-rich, high-pressure and weak soil strata conditions according to claim 1 , wherein the synchronous single-liquid grouting slurry is suitable for applying in the construction of large-diameter shield machines with diameters greater than 11 m in water-rich weak soil strata with water-bearing pressures greater than 0.5 MPa, wherein the water-rich and weak soil strata include water-rich silt layers, water-rich medium-coarse sand layers, water-rich medium-fine sand layers, water-rich clay layers or water-rich fluid plastic soil layers.

7. A shield synchronous single-liquid grouting process for the synchronous single-liquid grouting slurry for large diameter shield engineering under water-rich, high-pressure and weak soil strata conditions, comprising: a synchronous single-liquid grouting slurry according to claim 1 being added into a synchronous grouting system, and grouting synchronously to fill an interspace between a shield segment and a weak soil strata during a shield excavation, wherein the synchronous grouting system comprises 8 synchronous grouting units, each of the synchronous grouting unit comprises a grouting pipeline, the grouting pipeline comprises a slurry inlet and a scouring fluid inlet, being connected to a slurry pumping pipe and a scouring fluid delivery pipe respectively, wherein the slurry pumping pipe is connected to a slurry storage tank, the scouring fluid delivery pipe is connected to a scouring fluid storage tank; a scouring fluid inlet valve is set on the grouting pipeline.

8. The shield synchronous grouting technique according to claim 7 , wherein the slurry inlet and the scouring fluid inlet are located on both sides of the grouting pipeline.

9. The shield synchronous grouting technique according to claim 7 , wherein the slurry pumping pipeline and the scouring fluid pumping pipeline are provided with transfer pumps.

10. The shield synchronous grouting technique according to claim 7 , wherein each of the synchronous grouting unit is evenly distributed, and the synchronous grouting pipelines of grouting units are positioned between shield segment and weak soil strata around a circle, wherein the flushing liquid inlet valve is closed when grouting, and the synchronous single-liquid grouting slurry is added to the slurry storage tank of each of the synchronous grouting unit, and the slurry flows out from eight grouting pipelines at the same time, after grouting, the flushing liquid inlet valve is opened and the flushing liquid is pumped into the slurry pumping pipe and grouting pipeline; wherein a grouting pressure is 0.4-0.7 MPa, a grouting volume is controlled at 60-130 L/min, and a volume ratio of upper grouting pipeline and lower grouting pipeline is 6:4-7:3.

11. A preparation process for the synchronous single-liquid grouting slurry for large diameter shield engineering under water-rich, high-pressure and weak soil strata conditions according to claim 2 , comprising: (1) the silicate cement clinker, the steel slag, the waste clay brick, the slag and the limestone tailing being crushed separately, then being ball-milled until a maximum particle size being less than 120 μm, and then the required materials being weighed and mixed for later use; (2) the gold tailing being sieved to obtain gold tailing I with maximum particle size d max less than 120 μm and gold tailing II with a particle size ranging of 120-600 μm, the gold tailing being weighed according to that a proportion of gold tailing II is 40-60% of a total volume of the slurry for later use; (3) the fly ash, the silica fume and the desulfurization gypsum being sieved so that their maximum particle sizes being less than 120 μm, and then being weighed and mixed for later use; (4) a mixture in step (1), the gold tailing I with the maximum particle size d max less than 120 μm in step (2) and a mixture in step (3) being mixed uniformly, and then being ball-milled until the d 50 , d 85 and d 95 of the material particles are 35-40, 42-48 and 50-55 μm, respectively, and a mixing group I being obtained; (5) the calcium formate, the triethanolamine, the calcium nitrite and the sodium aluminate being weighed according to a proportion, being mixed and dissolved in water at 200-300 r/min for at least one minute, and a mixing group II being obtained; (6) the mixing group I and the mixing group II being mixed in a ratio of water-binder ratio (w/b) of 0.8:1-1.5:1, and then the mixtures being mixed at a stirring speed of 1000-1500 r/min for at least 5 minutes; (7) gold tailing II with the particle size range of 120-600 μm being added to the mixture in step (6), being stirred at the speed of 500-800 r/min for at least 4 minutes, then a stirring speed being adjusted to 1000-1500 r/min for at least 1 minute to obtain a synchronous single-liquid grouting slurry for large diameter shield engineering under water-rich, high-pressure and weak soil strata conditions.

12. The preparation process according to claim 11 , wherein in step (6), the slurry is stirred at a stirring speed of 1000-1500 r/min for 5-10 minutes.

13. The preparation process according to claim 11 , wherein in step (7), the slurry is stirred at a stirring speed of 500-800 r/min for 4-6 minutes and at a stirring speed of 1000-1500 r/min for 1-5 minutes.

14. An application of the synchronous single-liquid grouting slurry for large diameter shield engineering under water-rich, high-pressure and weak soil strata conditions according to claim 2 , wherein the synchronous single-liquid grouting slurry is suitable for applying in the construction of large-diameter shield machines with diameters greater than 11 m in water-rich weak soil strata with water-bearing pressures greater than 0.5 MPa, wherein the water-rich and weak soil strata include water-rich silt layers, water-rich medium-coarse sand layers, water-rich medium-fine sand layers, water-rich clay layers or water-rich fluid plastic soil layers.

15. A shield synchronous single-liquid grouting process for the synchronous single-liquid grouting slurry for large diameter shield engineering under water-rich, high-pressure and weak soil strata conditions, comprising: a synchronous single-liquid grouting slurry according to claim 2 being added into a synchronous grouting system, and grouting synchronously to fill an interspace between a shield segment and a weak soil strata during a shield excavation, wherein the synchronous grouting system comprises 8 synchronous grouting units, each of the synchronous grouting unit comprises a grouting pipeline, the grouting pipeline comprises a slurry inlet and a scouring fluid inlet, being connected to a slurry pumping pipe and a scouring fluid delivery pipe respectively, wherein the slurry pumping pipe is connected to a slurry storage tank, the scouring fluid delivery pipe is connected to a scouring fluid storage tank; a scouring fluid inlet valve is set on the grouting pipeline.

16. The shield synchronous grouting technique according to claim 15 , wherein the slurry inlet and the scouring fluid inlet are located on both sides of the grouting pipeline.

17. The shield synchronous grouting technique according to claim 15 , wherein the slurry pumping pipeline and the scouring fluid pumping pipeline are provided with transfer pumps.

18. The shield synchronous grouting technique according to claim 15 , wherein each of the synchronous grouting unit is evenly distributed, and the synchronous grouting pipelines of grouting units are positioned between shield segment and weak soil strata around a circle, wherein the flushing liquid inlet valve is closed when grouting, and the synchronous single-liquid grouting slurry is added to the slurry storage tank of each of the synchronous grouting unit, and the slurry flows out from eight grouting pipelines at the same time, after grouting, the flushing liquid inlet valve is opened and the flushing liquid is pumped into the slurry pumping pipe and grouting pipeline; wherein a grouting pressure is 0.4-0.7 MPa, a grouting volume is controlled at 60-130 L/min, and a volume ratio of upper grouting pipeline and lower grouting pipeline is 6:4-7:3.

2012/0145047 June 2012 Constantz
2022/0397036 December 2022 Chen
107572994 January 2018
107619236 January 2018

edspgr.12187646