224results about How to "Accelerated consolidation" patented technology

The invention provides a treatment method for large-thickness collapsible loess. The treatment method comprises the following steps: 1) sinking small-diameter steel casing into soil to form pile holes each having a depth equal to or smaller than the thickness of the collapsible loess stratum; 2) inserting (1) 1-6 drain boards or (2) hollow water pipes with a plurality of drain holes or (3) hollow steel pipes with a plurality of nozzles into the pile holes to bottom ends thereof; 3) repeating the steps 1) and 2) until the pile holes with the water injection fittings are formed everywhere in the field; 4) injecting water or injecting water under pressure into the water injection fittings in the pile holes to cause self-weight collapsible settlement of the collapsible loess after immersion; 5) observing and recoding the collapsible settlement amount of the soil mass in a foundation until the collapsible deformation of the soil mass in the foundation is stable; and 6) reinforcing the top-layer soil mass of the foundation by use of a filling compaction method or a dynamic compaction method. The treatment method has the characteristics and advantages of high construction speed, remarkable effect of eliminating loess collapse, dry operation, high bearing capacity, and the like.

The invention relates to a construction method of a spiral oil-extruding filling pile composite foundation in the stratum containing soft clay, which comprises the following steps: determining the structural size, the position and the number of spiral oil-extruding filling piles; manufacturing and constructing a vertical drainage well in the middle part of the design positions of every two adjacent spiral oil-extruding filling piles; manufacturing and constructing each spiral oil-extruding filling pile according to the design position in the middle part between every two finished vertical drainage wells; and then paving drain liner layers on the foundation surface. The invention aims at providing a method for treating the spiral oil-extruding filling pile composite foundation in the stratum containing the soft clay, which avoids the negative oil-extruding effect of the spiral oil-extruding filling piles, improves the drain speed of saturated clay around piles, improves the strength of soil bodies around the piles and under the piles, substantially reduces the settlement after construction, improves the effectiveness and the use range of the spiral oil-extruding filling piles, increases the space length between the piles, reduces the pile number, saves the engineering investment, and accelerates the construction progress.

The invention in a technical sphere of soft soil ground treatment in geotechnical engineering relates to a soil ground treatment method in the areas along the sea, the river and the lake. The invention combines a vacuum drainage, a compaction via vibration supercharging, and a compaction via dynamic consolidation supercharging, wherein a higher kinetic head gradient which is consisted of a positive pressure of excess pore water by vibration excitation and a vacuum negative pressure firstly discharges the water in soil and increases the water content in the soil, thereby compacting the soil to a certain extend, and then the dynamic consolidation action is proceeded to improve the excess pore water pressure and form the higher kinetic head gradient thereby draining and compacting the soil. All the steps are proceeded many times to eliminate the settling of the worked deep layer soft soil and to improve surface consolidation degree, intensity, and stiffness until up the design requirement. Compared with the present method, the invention not only has a short time for a project, lower manufacturing cost and settling after work, and a good effect of consolidating and compacting, but also is extensive used in the soft soil ground treatment of various projects in the area along the sea, the river, or the like.

The invention relates to a quick ''low level high-vacuum hierarchical precompression compaction' method for soft ground, the concretely processes are: 1) a sand layer is laid on the ground before filling, then the plastic water discharging boards are inserted vertically, a high vacuum precompression system is arranged transversely in the sand layer, and a layer of plastic air isolating film is covered; 2) the high vacuum precompressing system carries on vacuum and precompression; 3) the sand blowing high vacuum compacting system is arranged on the film transversely or vertically; 4) fills sand on the film to the set height; 5) the high vacuum precompression system carries on precompressing to the set boding rate, the system carries on the first time of vacuuming and discharge, then carries on the first time of compacting or vibration compacting the sand on the film; 6) carries on the second time or several times of 'high vacuum compacting' to the sand to the overconsolidation state. The invention is short period, low price, and the quality is controllable.

The invention discloses a mine goaf tailing-filled concrete enclosing wall. The wall body (2) of the mine goaf concrete enclosing wall is a horizontally placed rock-socketed pear-shaped concrete structure. The large end of the wall body (2) faces to a mine goaf (10). The convex drum-shaped upper part of the large end of the wall body (2) runs through a small rock mass well (1). An upper drain pipe (4) and a lower drain pipe (4) are arranged in the wall body (2) and are respectively used as an upper part drain pipe and a lower part drain pipe. The inlet of the upper part drain pipe and the inlet of the lower part drain pipe are respectively provided with a perforated pipe (7). The outlet of the upper part drain pipe and the outlet of the lower part drain pipe are respectively provided with a gate valve (5). A layer of stainless steel wire mesh covers the external surface of the perforated pipe (7) at the inlet of the lower part drain pipe. A sandstone inverted filter body (6) with certain thickness is spread outside the stainless steel wire mesh. A layer of geotextiles covers the surface of the sandstone inverted filter body (6). The invention has the advantages that the wall can bear the pressure of water head above 300m, the water and sand leakage can be prevented, the tailing settlement water can be drained, the tailing pore water can be also drained, and the consolidation degree and the stability of the tailing-filled body in the mine goaf can be improved.

The present invention relates to compositions and methods for use in osteodistraction procedures. In one embodiment, a method of stimulating osteogenesis during and/or following bone distraction comprises providing a composition comprising a PDGF solution disposed in a biocompatible matrix and applying the composition to at least one site of bone distraction.

This is a quick damming method suitable for yielding soil treatment composed by several layers of sullage and sand. At building, a layer of sullage is dumped then a layer of sand. Sand will sink into sullage by gravity to increase sullage penetrability. The procedure is repeated till reach the designed height. Put loading, like water bag, to the dam top to move out water and solidify.

The invention discloses a soft ground non-sand pre-compress water discharge solidifying method, which comprises following steps: a, arranging sample on the soft ground, and vertically inserting plastic discharge plate; b, laying horizontal water discharge tubes which are connected to the spanner of discharge plate that near the ground, while one row plates are relative to one discharge tube. The invention can replace traditional rough sand, to solidify the soft ground in variable conditions, even without sand. The invention can reduce the cost and time.

The invention discloses a construction method of a deep and thick soft soil foundation bed bridge abutment. The method comprises steps as follows: 1) forming a bridge abutment land construction area; 2) performing primary soft foundation treatment-vacuum water covering and pre-pressing treatment on the bridge abutment land construction area; 3) performing bridge abutment pile foundation construction and bearing platform construction; 4) performing secondary soft foundation treatment-composite foundation treatment on the bridge abutment land construction area; 5) backfilling the area behind the bridge abutment with a filler; and 6) completing the construction of a bridge abutment concrete structure. According to the construction method, due to the secondary soft foundation treatment, post-construction settlement of a road behind the bridge abutment and settlement differences between the road and a bridge abutment structure are reduced, and the phenomenon that a vehicle bumps at a bridge head can be prevented. The construction method of the deep and thick soft soil foundation bed bridge abutment is simple, convenient and feasible, high in efficiency, safe and reliable, and can control the project quality conveniently and save labor power, material resources and financial resources. The construction method is applicable to an area with a low foundation bearing capacity.

The invention discloses a median type tailing damming method utilizing mold bags. The median type tailing damming method has the advantages that the grouted mold bags 7 are piled up to build a downstream dam body 2, the downstream dam body 2 is kept clean and smooth by the sand consolidation effect of the mold bags 7, and the environmental problems such as dust flying, gullying and coarse sand loss are solved well; tailing pulp with the content of tailing particles, smaller than 0.05mm in size, not larger than 40% (by weight) is taken as mold bag filling pulp for the mold bags 7, so that the particle size range of tailing sand available for damming is widened, sand quantity available for the median type tailing damming method is increased, water drainage of the mold bags 7 can be accelerated, solidification can be speeded up, and grouting efficiency of the mold bags 7 is improved; in addition, the action of gravity is fully utilized for grouting, and the mold bags 7 can be grouted by multiple branch ore drawing pipes 92 at the same time, so that cost and energy consumption are reduced, and damming efficiency is improved.

The invention discloses a structure for dissipating excess pore water pressure and reinforcing a soil body around a shield tunnel. The structure comprises pipe pieces, first type grouting holes, second type grouting holes and infiltration bars, wherein the first type grouting holes and the second type grouting holes are formed in the pipe pieces, the infiltration bars are arranged to be hollow, and holes are drilled all over the bodies of the infiltration bars. The infiltration bars are integrally arranged inside the pipe pieces in a buried mode through the first type grouting holes, the tail ends of the infiltration bars are connected with the first type grouting holes, the first type grouting holes with the infiltration bars are distributed with the second type grouting holes as centers, four first type grouting holes with the infiltration bars are distributed in the adjacent periphery of each second type grouting hole, and four second type grouting holes used for grouting are distributed in the adjacent periphery of each first type grouting hole provided with the infiltration bar. According to the structure, the infiltration bars are inserted into the grouting holes of the pipe pieces and the infiltration bars are used for extracting water in surrounding soil, so that an infiltrating path is provided for the water contained in the soil body around the tunnel, excess pore water pressure is dissipated, effective stress of the soil is increased and soil solidification is accelerated.

The invention discloses a soil column testing apparatus for simulating solute transport in consolidated soil. The apparatus mainly comprises a pressurization and consolidation device and a soil column seepage device, wherein the pressurization and consolidation device mainly controls a pressurization disk via an air compressor and an air cylinder to apply a pressure onto a soil sample in a soil column so as to allow the soil sample to be consolidated, and then the soil column seepage device is used for seepage testing of the consolidated soil sample. According to the invention, a water head at the upper part of the soil column can be maintained at a constant value by controlling the placing height of Mariotte's bottle, so pore water in the soil column is allowed to be transported in the consolidated soil under the condition that the water head maintains constant, and the phenomena of transport and diffusion of pollutants in the consolidated soil under a constant water head condition is simulated.

A ''short-range overloading vacuum prepressing---dynamic discharging consolidation combination method'' to dealing with the soft soil ground foundation, its features are : overloading prepressing the vacuum membranes of conventional vacuum prepressing method with covering water; proceeding the settlement observation to each settlement observation points according the vacuum prepressing operating rules, continuing prepressing 5~10 days after the prepressing settlement above 80% of calculate settlement, then stopping the water overloading vacuum prepressing after ensuring stable completely; removing the vacuum membrane and sun-curing 1~2 days, then proceeding the dynamic dewatering consolidation to eliminating the stored water in sand cushions which is leaved when overloading vacuum prepressing rapidly, then dynamic consolidation or roller compaction after the water level below 1.5m. Its beneficial effects are: it can eliminate the water in muck soil during a short time and enhance the consolidation degree; it makes the skin soil layer get the greatest density, meets the requirements of load bearing capacity and rigidity rapidly and prevents rebound phenomenon; it shortens the construction period and lowers the costs and applies to large area project filling soil recently which has large thickness saturated soft soil particularly.

The invention discloses a method for determining soft soil foundation landfill site foundation treatment mode based on foundation bearing capacity. Firstly correction of foundation bearing capacity is carried out according to geological exploration report, then whether the corrected foundation bearing capacity meets landfill site total load requirement is judged, and whether treatment is required is determined according to the judging result, if treatment is required, the selected treatment mode includes foundation treatment by adopting reinforcement cushion rubber (1) or foundation treatment by adopting reinforcement cushion rubber and setting vertical shaft (2). The invention utilizes the load characteristics of large occupying area of landfill site, long load application period and step application, landfill process of landfill site is taken as step loading process, the improvement of foundation bearing capacity in operation period of landfill site is analyzed according to piling, loading and prepressing method, the landfill speed and foundation bearing capacity correspond over time by controlling operation procedure, and meanwhile reinforcement cushion rubber is arranged to provide a drainage layer for soft soil foundation, thus not only improving foundation bearing capacity but also being capable of effectively reducing differential settlement of small repository.

The invention discloses a flood discharge structure for a red mud filter cake storage yard. The flood discharge structure comprises a flood discharge vertical shaft (1) arranged in the middle of the storage yard, wherein the wall of the flood discharge vertical shaft (1) is provided with a plurality of rows of windows (3); and the bottom of the flood discharge vertical shaft (1) is connected with a flood discharge pipeline (2). The flood discharge structure is characterized by also comprising a flood discharge vertical shaft (1)-centered flood regulation tank (4), wherein the whole flood regulation area is in a column basin shape; and each window (3) is provided with a blocking plate (5). A diluvial area of the storage yard is limited in a small range, so that the decrease speed of dry beach length of the storage yard is reduced, the safe operation time of the storage yard is prolonged, and the effective storage of the storage yard is increased; meanwhile, a novel structure of the windows and the blocking plates thereof is adopted, so that the solidification of red mud nearby the vertical shaft is accelerated, and the safety stability of the storage yard is facilitated.

The invention discloses a negative skin friction (NSF) removing foundation treatment method. A method for combining discrete piles and flexible piles is used for treating NSF caused by self-weight consolidation of a soil body, gravel piles or sand-gravel piles can serve as the discrete piles, the discrete piles and the flexible piles are arranged at intervals, and gravelly soil cushions are laid on the foundation surface above the discrete piles and the flexible piles. According to the NSF removing foundation treatment method, self consolidation settlement of foundation soil is reduced by construction compaction and vibro-compaction of the discrete piles, loads can be transmitted to foundation supporting layers by the construction of the flexible piles so that stress and compressive deformation of a reinforced zone can be reduced, and 'extrusion' and 'clamping' effects can be achieved on soil among piles under the combined action of the discrete piles and the flexible piles so that consolidation settlement of the foundation soil and NSF caused by the consolidation settlement of the foundation soil can be inhibited. Meanwhile, the combined foundation treatment method can improve bearing capacity of a foundation to a large extent by drainage consolidation and substitution of the flexible piles.

A process of dewatering tailings is provided comprising mixing the tailings with a sufficient amount of an additive or a mixture thereof; depositing the resulting mixture into a disposal area; pumping water from the deposit to one or more sumps, and allowing the deposit to reach a sufficient strength; and removing remaining deposit water and rainfall through one or more of a network of ditches, a decant tower, or a plurality of dike drainage structures to yield a non-segregating deposit for reclamation.

The invention provides a preparation method of a high-temperature resistance multilayer precoated sand, which comprises the following steps: a)heating screened quartz sand or ceramsite in a high-temperature furnace to 150-180 DEG C and then placing in a first-grade sand mixer, injecting a coated material while stirring, adding a curing agent after stirring for 10-20 seconds, continuously stirring for 90-240 seconds to obtain the precured coated quartz sand or ceramsite; b)placing the precured quartz sand or ceramsite in the step a) in a secondary sand mixer for heating to the temperature of 150-180 DEG C, injecting nonsaturated resin, organosilicon and the curing agent while stirring, stirring for 40-140 seconds to obtain the solidifiable coated quartz sand or ceramsite; and c)cooling the solidifiable coated quartz sand or ceramsite in the step b) to the temperature of 100-110 DEG C and placing in a third-grade sand mixer, adding calcium stearate with inertia resin weight of 5-7%, and uniformly stirring to obtain the product for warehousing.

The invention relates to a bamboo joint type sleeve pile and electroosmosis combined soft soil roadbed reinforcement system. The system is characterized by comprising an electroconductive plastic drainage plate, bamboo joint type sleeves, a prefabricated pile point and a prefabricated cover plate; the strip electroconductive plastic drainage plate tightly fits the outer sides of the bamboo joint type sleeves; the bamboo joint type sleeves are fixed through steel rings at certain intervals; the prefabricated pile point is arranged at the bottom end of a bamboo joint type sleeve pile; a U-shaped reinforcing bar is pre-buried in the prefabricated pile point; the bottom end of the electroconductive plastic drainage plate is connected with the U-shaped reinforcing bar; the prefabricated cover plate is arranged at the top end of the bamboo joint type sleeve pile; a preformed hole for allowing the electroconductive plastic drainage plate to pass through is reserved in the prefabricated cover plate; the electroconductive plastic drainage plate stretches out of the preformed hole; and the electroconductive plastic drainage plate is connected with a direct current power source through a conducting wire. The bamboo joint type sleeve pile and electroosmosis combined soft soil roadbed reinforcement system has the beneficial effects that the bamboo joint type sleeve pile is formed through connecting sections of bamboo joint type sleeves, and the problem that the construction is difficult due to the fact that the sleeve length of a conventional plastic sleeve pile is difficult to control is solved; and the bamboo joint type sleeves have bulges, so that the friction force of a common plastic sleeve pile and a surrounding soil body is improved, and the bearing capacity is improved.