83results about How to "Accelerated drainage consolidation" patented technology

The invention discloses a bidirectional vacuum pre-pressing hydraulically-filled soft ground treatment process, which comprises the following steps that building sealing walls and embedding vacuum pipes on the bottom of a coffer-dam, paving sand cushion with appropriate thickness whose inner portion is provided with filter strainers and vacuum tubes, and the surface is covered with earth-work cloth, building plastic drainage plates whose one section which is exposed on the surface of earth is vertically tied on a bamboo frame upwards, hydraulically filling sands to height mark, installing vacuum-pumping devices, and paving vacuum films. And the process is finished after the design consolidation degree is reached on the earth through starting the vacuum-pumping pump. The process increases the reinforcing treatment depth of vacuum pre-pressing, shortens the construction cycle of hydraulically-filled earth-building project, and saves vacuum film material.

The invention relates to a soft-and-hard interlayer alternation foundation drainage prestressed pipe pile. The soft-and-hard interlayer alternation foundation drainage prestressed pipe pile is characterized in that an expanded prestressed pile tip is arranged at the bottom of the prestressed pipe pile; the prestressed pile tip and the prestressed pipe pile are sleeved with a geotechnical cloth bag, and the top of a hard soil layer and a soft soil layer are locally expanded to form expanded cloth squeezing bags; a drainage pipe is arranged between the prestressed pipe pile and the geotechnical cloth bag, and the upper end of the drainage pipe extends out of the top of a cover plate to be communicated with a horizontal drainage main pipe on the upper portion of the cover plate; a pervious concrete pile periphery is arranged between the geotechnical cloth bag and the prestressed pipe pile; three to four arc-shaped steel plates connected in series are arranged at the position of the vertical center elevation of a carrying plate or a drainage plate along the lateral wall of the prestressed pipe pile; a steel strand penetrates through the steel strand fixing end of the expanded prestressed pile tip, and the other end of the steel strand is fixed on an anchor tool at the top of the cover plate; a cover plate is arranged at the top of a pile body. By means of the soft-and-hard interlayer alternation foundation drainage prestressed pipe pile of the structure, relative hard soil layers in a foundation can be sufficiently driven for carrying; meanwhile, drainage consolidation of the soft soil layers is conveniently achieved, foundation settlement is prompted to be completed in the construction period as far as possible, total settlement and after-construction settlement are small, and the good technical and economic benefits are achieved. The invention further discloses a construction method for the pile body.

The invention provides a method for treating weak foundation by mesh bag method, which comprises: weaving mesh bags by macromolecular engineering materials, filling the mesh bags with sandstones as aggregate; planting into the holes drilled in the foundation and filling the holes with sandstone aggregate to form mesh bag sandstone piles; laying the mesh pieces woven by macromolecular engineering material and pad layer consisted of sandstone aggregate on the top surface of the pile and foundation; connecting the mesh open on the top of the mesh bag broken stone pile with the mesh pieces thereon; thus, the mesh and the mesh bags are connected into a complete reinforcing body in the foundation, and the reinforcing body and the original foundation together form a composite foundation. The invention is a simple and easy method, uses the polyethylene and polypropylene macromolecular engineering material with the advantages of high strength, acid-base resistance, anti-aging and anticorrosion; is more suitable for foundation treatment in salinized soil region with high corrosion to concrete and steel; achieves higher integrity of reinforcing body, can greatly increase the foundation bearing capacity and reduce settlement amount to reach the building design requirement.

Disclosed is a combined-type composite foundation with controllable rigidity piles, drainage materials and a reinforced cushion. The reinforced cushion is laid on the surface of a soft soil foundation. The vertical drainage materials and the rigidity piles with caps are arranged in the foundation. Grouting tubes are installed between pile tops and the pile caps to form a controllable supporting system. When grouting is not conducted on the grouting tubes, drainage consolidation is conducted through the soft soil foundation under the effect of an upper load so as to improve the bearing capacity. The bearing effect of the rigidity piles is difficult to play due to the fact that the rigidity piles are stabbed into the grouting tubes. When the grouting tubes are grouted and after slurry is hardened, the pile caps, the slurry and the rigidity piles form a rigidity support, and the goal that the load is undertaken by the piles and soil together to reduce settlement is realized. Meanwhile, the reinforced cushion has the effects of restraining the horizontal displacement of the piles and the soil, limiting the local deformation of a dyke and a dam and the like. According to the composite foundation, the bearing force of the foundation soil can be given full play; the using amount of the rigidity piles is reduced; the stability of the foundation is improved; the post-construction settlement and differential settlement are reduced; the construction period is shortened; and the composite foundation can be applied to projects such as highways, railways and earth-rock dams.

The invention relates to a foundation drainage control method. The method comprises the following steps of: arranging a circle of vertical impervious curtains around a building foundation, arranging a vertical drainage body inside a foundation in the vertical impervious curtain, sequentially arranging a drainage sand mat, a horizontal impervious layer and a protective layer on the vertical drainage body, and hermetically connecting the vertical impervious curtain and the horizontal impervious layer. During the period of construction, the drainage solidifying of foundation soils is forcibly quickened through vacuum combined surcharge preloading so as to improve the strength of the foundation soils and ensure that the consolidation settlement of the foundation is completed as much as possible in the construction period. Before the beginning of the engineer operation period, the preloading process is stopped and a drainage pipeline is tightly sealed in order to block the further generation of the consolidation settlement of the foundation soils, thereby achieving the purpose of favorably controlling the post-construction settlement of the foundation. The provided foundation drainage control method of the invention is suitable for the soft soil foundation with low strength and big compressibility and has the characteristics of low construction cost, short construction period and favorable control effect of the post-construction settlement.

The invention provides a large-sized filling bag embanking method and equipment for filling an embankment by using dredged soil. The method comprises the following steps: (1) designing the depths and the distances of soft soil foundation plastic water drainage plates under the embankment, finishing the construction of the water drainage plates, and mounting monitoring facilities in the soft soil foundation; (2) finishing one layer construction of a sand quilt layer and a soft soil row; (3) processing large-sized filling bags for future use for by using polyester woven fabric; (4) mounting dredged soil filling equipment; (5) mounting an evacuating device; (6) laying an evacuating water drainage pipe network; (7) laying the filling bags and carrying out filling construction; (8) mounting an embankment surface sealing system; (9) opening an evacuating system to accelerate drainage consolidation of a dredged soil filling body and simultaneously developing relevant monitoring and detecting works; and (10) finishing an open sea side protective surface structure and an inland sea side protective slope structure in time by using the full embankment body rising process so as to reinforce the protection of the embankment body. The equipment used by the method provided by the invention is filling equipment for the dredger fill filling bags. According to the invention, the embankment building cost is reduced, the environment is protected, the stability of the embankment is guaranteed, and the clay particle content of the filling body is 10%.

The invention discloses a river channel segmental desilting construction method, and belongs to the technical field of river channel regulation. According to the river channel segmental desilting construction method, a river channel is segmented, flexible dams are constructed respectively, silt deposition ditches are excavated in front of dam bodies, and silt at the bottom of the river channel is treated by using the water head difference generated after dam construction and water flow impact force generated after water gates are opened for drawing off water. The structural form of the self-floating type dam bodies is adopted in the river channel segmental desilting construction method, the flexible dams can descend automatically according to variations of the river water level, then segmental treatment is conducted, and therefore deposition conditions of the silt can be improved easily; the drainage gates are used in cooperation with the segmental silt deposition ditches, so that the silt deposition efficiency is improved while the water is drained; net-shaped cover plates are arranged above the silt deposition ditches to be used for shielding impurities and protecting personal security; inorganic composite agents are added for conducting innocent treatment on the silt, so that secondary pollution is prevented from being caused to the environment in the process of recycling the soil body; water drainage and solidification of the silt are accelerated, so that the treatment efficiency of the silt is improved.

The invention provides a method for treating a soft soil foundation through combination of a bagged grouting gravel pile and vacuum preloading. The method comprises the steps that (1) shallow vacuum drainage pretreatment is conducted on the soft soil foundation to form a construction machinery work platform with a certain strength and bearing capacity; (2) bagged grouting gravel pile construction is carried out through an immersed tube method, and grouting tubes are embedded in the pile; (3) the bagged grouting gravel pile serves as a vertical drainage channel, and the deep soft soil foundation is treated through directly draining type vacuum preloading; and (4) grouting is conducted on the bagged grouting gravel pile through the embedded grouting tubes, the strength of a pile body is improved, and a rigid pile composite foundation is formed. By means of the method for treating the soft soil foundation through combination of the bagged grouting gravel pile and vacuum preloading, the purposes of economy and environmental protection are achieved, construction is easy and convenient, and a sand cushion is omitted; the method is applicable to treatment of a large-area ultra-soft clay foundation with the very high moisture content or a large-area new hydraulic fill mud foundation with the very high moisture content; the reinforcing efficiency is remarkable, the foundation treatment period can be substantially shortened, and the cost of construction is reduced.

The invention relates to a reamed carrier and stiffness core multi-component composite pile and a soft soil foundation strengthening construction method. The reamed carrier and stiffness core multi-component composite pile comprises a discrete pile, a stiffness core pile is inserted into the discrete pile vertically and penetratingly, the bottom end of the stiffness core pile is flush with the bottom end of the discrete pile, and the bottom ends of the stiffness core pile and the discrete pile are jointly connected with a spherical carried reamed head to form the reamed carrier and stiffness core multi-component composite pile. The soft soil foundation strengthening construction method by the reamed carrier and stiffness core multi-component composite piles includes driving a plurality of the discrete piles, the reamed carrier and stiffness core composite piles and / or stiffness core composite piles into a soft soil foundation; the construction steps of the discrete piles, the reamed carrier and stiffness core composite piles and the stiffness core composite piles include (1) discrete pile construction, (2) reamed carrier and stiffness core composite pile construction and (3) stiffness core composite pile construction. The composite pile has the advantages of good drainage effect and high bearing capacity, and the method has the advantages of simple and mature technology, remarkable strengthening superiority and high benefit.

The invention discloses a wet and soft soil foundation treatment method which comprises the steps of 1, backfilling completely within the roadbed width range; 2, before roadbed construction, firstly, removing surface water, and then removing the surface layer salinized soil and surface organic matter of a construction region; 3, backfilling gravel soil within the treatment range, and carrying out primary rolling; after rolling is finished, leveling to form a cross slope; 4, excavating two trapezoid drainage ditches respectively at the two sides of a roadbed; 5, laying a plastic drainage plate; 6, dynamic compaction, compacting by points for twice and fully compacting for once; 7, after dynamic compaction treatment, rearranging the roadbed, and cleaning the overground part of the top of the drainage plate; laying a middle coarse sand cushion layer as a drainage channel, wherein the gradient of the middle coarse sand cushion layer is equal to that of the roadbed; placing a bending part of the plastic drainage plate in the center of the sand cushion layer to enable the bending part to be communicated with the sand cushion layer; 8, backfilling gravel soil onto the middle coarse sand cushion layer; 9, after the roadbed is finished, laying gravel on the surface layer, rolling and compacting.

The invention relates to a top-reinforced cast-in-place concrete thin-wall pipe pile, and further discloses a construction method of the top-reinforced cast-in-place concrete thin-wall pipe pile. The top-reinforced cast-in-place concrete thin-wall pipe pile is characterized in that the pile body of a thin-wall pipe pile body is formed by cast-in-place of double-layer steel immersed pipes. The pile diameter of the upper portion of the pile body is enlarged, and a plastic casing pipe and a vertical drainage body are sequentially arranged on the outer side of a concrete pile body of the pile-diameter-enlarged section from inside to outside; the pile-diameter-enlarged section is connected with an upper precast pile tip, and the bottom of the pile body is connected with a lower precast pile tip; the soil body, on the upper portion of the thin-wall pipe pile, around the pile is solidified to be a solidified soil layer; connection ribs are arranged between the top of the thin-wall pipe pile and a pile core closed section and a pile top cover plate; a drainage channel communicated with the vertical drainage body is formed in the pile top cover plate. The top-reinforced cast-in-place concrete thin-wall pipe pile improves pile body casting quality, can improve the mechanical property of the upper-portion pile body and the mechanical property of the soil body around the pile and prevent the pile body from deforming when mud cakes are taken out of the earth surface and has good technical and economic benefits.

The invention relates to a highway-foundation construction method and particularly relates to a construction method for combining composite foundations of rigid piles and soft-soil foundations of water-draining consolidation and reinforcement highways. The construction method comprises the construction steps of paving a working cushion layer; adopting a bagged sand well as a vertical water-draining body, adopting vibratory tube sinking to lower the bagged sand well, carrying out vibratory tube pulling, and supplementing materials at an empty well section in the tube pulling process; driving rigid piles, carrying out vibratory tube pulling after filling up concrete into sleeves by a mode of vibratory tube sinking, wherein the tube pulling speed is less than 1.2m / minute, and the tubes cannot be inserted inversely in the process of vibratory tube pulling; and casting pile caps, and adopting an inverse excavation construction method to cast the pile caps in constructed working cushion layers or filled soil; and backfilling roadbeds, arranging a settlement plate on column tops and among columns, filling to the height of less than 5m and adopting a vibratory pressing machine for flattening. Compared with the construction method for composite foundations of pile supporting dikes and rigid piles, the construction method for combining the composite foundations of the rigid piles and the soft-soil foundations of the water-draining consolidation and reinforcement highways has the advantage that the cost can be respectively saved by 40% and 46%.

The invention relates to a processing method about blow-filled foundation, comprising that: a blast-filled ground is leveled, a longitudinal slope is arranged in one direction; blind drains are arranged along the direction of the longitudinal slope; a sand water conveyance cushion layer is paved, a gas injection pipe is buried at the middle position between the blind drains; the blow fill is blast-filled on the sand cushion layer, when the thickness of the blow fill is above 50cm, the gas supplying device is started, the gas is injected into the sand water conveyance cushion layer by the gas injection pipe, gas injection and blast-filling are carried out simultaneously, and the water flowing out from the blind drains is cleaned at the same time; when the thickness of the blow fill is half of the designed monolayer thickness, gas injection pipes are paved on the blow fill, then the blow fill is blast-filled continuously until the thickness of the blow fill reaches monolayer thickness, and gas is injected into the blow fill layer; the above steps are repeated until the thickness of the blow fill reaches the total height; after blast-filling, each layer of gas injection pipes continuously inject gas until the blind drains have no water flowing out. The effect is better if combining with surcharge preloading. The processing method about blow-filled foundation has the advantages of easy implementation, blast-filling and simultaneously injecting gas to drainage, greatly shortening the build-up time of the foundation strength, in favor of the after-maintenance of the foundation strength.

The invention relates to an integrally-arranged and externally-wrapped double-layered water discharging body and middle concrete combined pile which is formed by a pile body inner side annular water discharging body, a cast-in-place concrete thin-walled pipe pile body, a pile body outer side annular water discharging body, a prefabricated pile tip and a prefabricated reinforced concrete cover plate; the prefabricated pile tip is arranged at the bottom of the combined pile; the top face of the pile tip is provided with four annular grooves for limiting the position of an immersed tube; the prefabricated reinforced concrete cover plate is arranged at the top of the combined pile; and a water discharging branch pipe is arranged inside the cover plate. According to the integrally-arranged and externally-wrapped double-layered water discharging body and middle concrete combined pile disclosed by the invention, the water discharging bodies with the uniform thickness are arranged on the inner side and the outer side of a concrete tubular pile, so that the consolidation of the soil body between the piles can be accelerated, the bearing capability of a soil foundation is improved, diseases of pile breaking and the like, caused by a soil squeezing effect, can be prevented when an adjacent pile is pegged, and the good technical economic benefit can be realized. The invention further provides a construction method of the combined pile.

The invention discloses a treatment method of extensive dredging dredger fill foundation and its infiltration pipe. The treatment method contains the following steps: firstly, set the infiltration pipe (2) vertically on the dredger yard (5) and divide (5) into at least two dredger areas. Then, dredge the muddy dredger fill (3) into the dredge areas. Finally, set artificial hard shell (1) on (3). The head of (2) extends into the upper surface of (1). The treatment method in this invention firstly divides the extensive dredger yard into small areas and dredges simultaneously to improve the efficiency of foundation treatment. Setting discharge channels before dredging can realize dredging and discharge consolidation simultaneously instead of treating after dredging, which shorten the time to enhance the foundation strength.

The invention provides a hollow pile with multiple holes on a lateral wall, belonging to a novel hollow pile for civil engineering. With the adoption of the hollow pile with multiple holes on the lateral wall, soil drainage and solidification can be accelerated, the bearing capacity of a pile body is improved, namely punched holes 4 are formed between an internal wall 2 and an external wall 1 of the pile body of the traditional hollow pile, and upper rows of holes and lower rows of holes are arranged in a staggered manner to form a honeycomb shape. Compared with the traditional hollow pile with the same section size, the holes are formed on the lateral wall and are arranged in a staggered manner and in a honeycomb shape, so that the pile body has a function of transverse water permeability, the dissipation rate of excess pore-water pressure in a foundation soil body can be accelerated, and the efficiency of foundation drainage and solidification is greatly improved; moreover, after pile sinking is completed, soil body extruded from the holes of the pile body is compacted and solidified with a surrounding soil body, the influence of a water film on a critical face between the pile and soil on the side friction resistance of the pile can be effectively reduced, the bearing capacity of the pile body is improved, building garbage is reduced, the environment is protected, and social resources are saved.

The invention belongs to the technical field of foundation treatment of geotechnical engineering and provides equipment for strengthening a deep soft soil foundation by vacuum preloading of a filter well and a method. The equipment comprises the filter well, a vacuum device, a sealing structure, a grouting device and a connecting pipeline, wherein the vacuum device is connected to the upper end of the filter well through the connecting pipeline; the sealing structure is used for ensuring sealing of the whole equipment during vacuum preloading operation; the filter well is formed by combining a sand well and a vacuum pipe; the vacuum pipe is formed in the middle part of the sand well and is composed of a plurality of sections of PVC pipes and a plurality of sections of filter pipes; and the grouting device is used for filling cement-clay grout into a pore of the filter well by the vacuum pipe of the filter well to form a cement mortar pile after vacuum preloading is finished. The equipment can reduce the route loss of the vacuum degree of the filter well to make the vacuum degree of the whole section of the filter well keep a high value, so that the whole strengthening effect of the deep soft soil foundation is ensured; and meanwhile, cement mortar is poured into the sand well by utilizing the vacuum pipe to form a cement pile, and thus the bearing capacity of the foundation is dramatically improved.

The invention belongs to the technical field of foundation treatment in geotechnical engineering, and relates to a deep soft soil foundation consolidation method, in particular to an air impacting drainage and double-faced vacuum preloading consolidation method of a deep soft soil foundation. The air impacting drainage and double-faced vacuum preloading consolidation method has the advantages that the traditional drainage board is replaced by an air impacting drainage body formed by assembling and connecting the drainage board, a multifunctional pipeline, a hand type joint and a communication joint, and in an early consolidation stage, a multifunctional pipeline system is connected with a vacuum device to form a vacuum pumping system, and an upper vacuum working face and a lower vacuum working face jointly act, so that double-faced vacuum drainage consolidation is realized, the effective consolidation depth is increased, drainage consolidation is accelerated, and a construction period is shortened; in a later consolidation stage, the multifunctional pipeline system is connected with a supercharging device to form an air impacting drainage system, so that the drainability can be improved quickly and the clogging effect of the drainage board can be alleviated effectively; the problems that the effective consolidation depth is low, the drainability is limited and the clogging effect occurs when the traditional vacuum preloading technology is adopted to treat the deep soft soil foundation are solved; the overall consolidation effect of the deep soft soil foundation is ensured; and the air impacting drainage and double-faced vacuum preloading consolidation method is simple, reliable, economical and practical.

The invention discloses a concrete pile suitable for foundation treatment. The concrete pile comprises a pile body which is a variable cross-section structure formed integrally, diameter expansion portions are arranged on the pile body at intervals, a diameter reduction portion is arranged between every two adjacent diameter expansion portions, and the diameter reduction portions and the diameterexpansion portions are connected and fastened through necking down structures; each diameter expansion portion is a closed ring or non-closed ring provided with a notch, and difference value between the radial width of the diameter reduction portions and that of the diameter expansion portions is smaller than or equal to 60 mm. The concrete pile has the advantages of being higher in practicabilityand applicability, the pile body directly make contact with an original soil body in the construction process, no weak link exists, and the foundation soil bearing capacity is promoted remarkably bymeans of expansion and vibration on the soil body by the diameter expansion portions; after the soil body is solidified, loads on the foundation soil are uniformly distributed into the foundation soilthrough the load bearing faces of the diameter expansion portions and the diameter reduction portions, a whole is formed by the foundation soil and soil around the pile, the foundation settlement problem is improved substantially, and the global stability of the foundation is improved; the concrete pile is low in manufacturing cost and good in economic benefits.

The invention discloses a geogrid reinforced earth retaining wall based on construction waste and a construction method. The reinforced earth retaining wall mainly comprises waste packing, geogrids, aprefabricated concrete panel, interlayer drainage devices and drain pipes. In order to guarantee confinement performance of the geogrids for the waste packing, on one hand, gradation of the waste packing nearby the geogrids is controlled, on the other hand, the interlayer drainage devices are laid at the upper parts of the geogrids, and water is collected into the drain pipes by the interlayer drainage devices and discharged in a unified manner, so that pore water pressure of the packing can be effectively reduced; the geogrid reinforced earth retaining wall is fast to consolidate, stable inmechanical property, short in construction time and low in cost, environmental protection is facilitated, and construction waste is recycled to the greatest extent.

The invention provides a multifunctional composite vacuum preloading treatment method for sludge with high water content and high organic matter. The multifunctional composite vacuum preloading treatment method comprises the following steps: a woven fabric and a geogrid are laid on the surface layer of a site; holes are formed in the woven fabric and the geogrid, and calcium oxide is added; a geotechnical cloth is laid on the geogrid; a foam board is laid on the geotechnical cloth; a Fenton agentia and peanut shells are added through an agentia adding hole; a plastic drainage board is struck;a pressurization pipe is buried; the top of the pressurization pipe is connected with a horizontal pressure pipe, and the pressurization pipe is externally connected with an air compressor; a drainagepipe network is laid; a final water outlet of the drainage pipe network is connected with a vacuum jet pump; a sealing system is constructed; the horizontal sealing system is made of double layers ofpolyvinyl chloride vacuum sealing films; after vacuumizing reaches stable full loading, the surface is overlaid with water for protection; the vacuum jet pump is laid; vacuumizing is tested; and a pressurization system is started. The amount of the sludge can be decreased, pathogenic bacteria of the sludge and toxicity can be further reduced, and finally treatment, disposal and resource utilization of the sludge are facilitated.

The invention relates to a well-point dewatering combined surcharge preloading consolidation device for a subgrade and an application method of such a device. The consolidation device comprises a water storage unit, well pipes, a main pipe and a water pump; the water storage device is placed in a region to be consolidated of the subgrade; a plurality of well pipes are arranged at predetermined positions around the region to be consolidated; each well pipe is connected with the main pipe, and the main pipe is connected with a water inlet / outlet of the water storage device; the water pump draws water from the well pipes, and conveys water into the water storage device via the main pipe, and the water storage device performs supercharge preloading on the region to be consolidated by means of dead load of water. By utilizing the well-point dewatering combined surcharge preloading consolidation device for the subgrade, the consumption of such materials as gravel and soil can be greatly reduced, the work amount can be lowered, the construction cost can be decreased, and the environmental pollution can be reduced.

The invention discloses a powder dehumidifying agent for an existing roadbed, which comprises the following raw materials in parts by weight: 10-40 parts of calcium oxide powder, 20-65 parts of amphoteric metal powder, 10-30 parts of sodium carbonate powder and 5-30 parts of porous auxiliary, wherein the porous auxiliary is diatomite, fly ash or activated carbon. The invention further discloses apreparation method of the dehumidifying agent. The powder dehumidifying agent can absorb a large amount of water in the roadbed during the reaction process with water, reduce pore water in a soil body, simultaneously release heat during the reaction process and generate high temperature of 40 DEG C-110 DEG C in the soil body; as the pore water in the roadbed can be gasified due to the increase ofthe temperature of the soil body, the water content and the porosity of the soil body of the roadbed are further reduced and the drainage consolidation of the roadbed is accelerated; simultaneously, the powder dehumidifying agent can generate a series of chemical reactions after water absorption, thereby expanding the volume and having good compaction effect against the roadbed under the situation of ensuring no occurrence of bulging.

The invention discloses a method and a device for bottom drainage and seepage of a film-laying anti-seepage phosphogypsum storage yard, wherein water contained in phosphogypsum under a phosphogypsum initial-stage dam with an HDPE (High-Density Polyethylene) film laid on the upstream slope surface is drained so that the phosphogypsum under the initial-stage dam is solidified; besides, a reinforced concrete box culvert is arranged in the dam heel position of the upstream surface of the initial-stage dam and a plastic blind ditch is filled in the reinforced concrete box culvert; and the water seepage is collected by the reinforced concrete box culvert, is filtered by the plastic blind ditch and enters a stainless steel pipe at the tail part of the reinforced concrete box culvert to be drained out of the reinforced concrete box culvert, and further is drained to the downstream through an HDPE pipe which buried through the bottom of the initial-stage dam. The drainage and seepage system provided by the invention guides out the water contained in phosphogypsum stacked in a reservoir basin under the elevation of the initial-stage dam of the storage yard and water accumulated from rainfall and then guides the water to the downstream from the bottom of the dam to a regulating reservoir outside the reservoir, so that the water contained in the phosphogypsum is drained as soon as possible, and drainage and solidification of the phosphogypsum are accelerated; and as a result, the stability of the phosphogypsum storage yard is ensured.

The invention discloses a geocell composite reinforcing rib ecological retaining wall and a construction method thereof. The ecological retaining wall comprises retaining wall units sequentially constructed from bottom to top, and each retaining wall unit comprises a bottom geocell layer, a unidirectional geogrid, at least one inverse filter inclusion layer, a bidirectional geogrid and a filling layer. The construction method includes: S1, performing earth excavation and pouring retaining wall rigid strip foundation; S2, laying geocells, and filling filler in the geocells; S3, carrying out unidirectional geogrid return construction; S4, arranging the bidirectional geogrid; S5, repeating the steps until a retaining wall design height is achieved. By adoption of the geocells with a stereo reinforcing rib structure as a bottom layer structure, the geocells are filled with the filler, the unidirectional geogrid is laid at the top of the leveled filler in the geocells, and the inverse filter inclusion layers are arranged while the bidirectional geogrid is arranged between every two composite reinforcing rib layers, structural stability of the ecological retaining wall is guaranteed by layer-by-layer construction, and simplicity in construction is realized.

The invention relates to a hard-soft combined pile for strengthening thick covering layer deep-buried soft soil. The combined pile comprises a cement mortar pile, a large-diameter concrete pile and a prefabricated pipe pile, wherein the cement mortar pile is arranged on an upper thick covering layer, the large-diameter concrete pile is mounted on a lower soft soil layer, the prefabricated pipe pile is disposed at the center of a pile body of the combined pile, a grout liquid reinforcing area is arranged around the cement mortar pile, a prefabricated pile point is disposed at the bottom of the large-diameter concrete pile, the prefabricated pile point extends into a relative supporting layer, a geomembrane bag wraps the pile body of the combined pile, a grout-impermeable geotechnical cloth bag wraps the large-diameter concrete pile, a grout-permeable geotechnical cloth bag wraps the cement mortar pile, a plastic drainage plate or a soft water-permeable pipe is arranged outside the geomembrane bag, and a steel reinforcement cage is welded at the bottom of the prefabricated pipe pile. According to the hard-soft combined pile for strengthening the thick covering layer deep-buried soft soil, own features of two soil layers such as the thick covering layer and the soft soil layer are considered, different construction materials and processes are utilized, the problem of poor reinforcing effects by traditional construction methods can be solved, and the good reinforcing effect is achieved.

The invention discloses a treatment method for strengthening a soft soil foundation through combination of vacuum pre-pressing and a foundation heating method. Vertical plastic water discharging plates are arranged in a foundation, plate heads of the vertical plastic water discharging plates are connected to transversely-arranged filter pipes, and the outlet ends of all the filter pipes communicate with an inlet of a pressure guiding and flow distributing device; heating devices are further arranged in the foundation, a sand cushion layer is laid on the foundation, the filter pipes are embedded in the sand cushion layer, a heat preservation layer is laid on the sand cushion layer, a sealing film is laid on the heat preservation layer, and a closed vacuum pre-pressing system is formed. During work, the pressure guiding and flow distributing device is started firstly, and foundation strengthening treatment is conducted through a conventional vacuum pre-pressing method; when conventional drainage consolidation is conducted to the later period, a temperature control heating body is started for foundation heating, meanwhile, the foundation is subjected to vacuum pumping, water in the foundation is converted into the gas state from the liquid state through control over the foundation heating temperature and the foundation absolute pressure intensity, the water content of the foundation is further reduced, and the strength of the foundation is enhanced.

The invention relates to a drainage cast-in-situ concrete thin-wall pipe pile construction method. The method comprises the following steps: preparing before construction, paving solidified soil, driving a sinking steel pipeline and a pile casing, mounting a precast reinforced concrete sleeve, pouring concrete in a pile body, vibrating and drawing the pipeline, filling the pile top, pre-burying connecting screw rods and a water drainage pipe, and mounting a pile top precast cover plate. According to the method, mechanical properties of the upper part of the pile body and a soil body around the pile body are improved, the effect that pile groups compact soil is relieved, the consolidation settlement amount caused by the change of underground water level in foundation soil and other reasons is reduced, and better technical and economic benefits are realized.

The invention particularly relates to a construction method of a prestressed pipe pile with vertical water discharge grooves, and is used for solving the problems in the traditional construction of the prestressed pipe pile, such as sedimentation, bearing capability reduction and pollution to the construction field. The construction method comprises the following steps of a. uniformly distributing water discharge grooves on external circumference of the prestressed pipe pile, and arranging a V-shaped groove between two adjacent water discharge grooves, wherein the V-shaped groove is communicated with the two adjacent water discharge grooves; b. installing a water accumulation protection drum with an opening at the bottom at the insertion position of the prestressed pipe pile, wherein a water guide pipe communicated with the water accumulation protection drum is arranged on sidewall of the water accumulation protection drum and a control valve is arranged on the water guide pipe; c. inserting the prestressed pipe pile along the opening of the water accumulation protection drum, wherein pore water enters the water discharge grooves under the action of pressure, the pore water in the water discharge grooves rises and is discharged through the water guide pipe; and d. installing the water accumulation protection drum to the insertion position of next prestressed pipe pile. The construction method has reasonable and reliable structure design, not only can reduce insertion resistance to improve construction progress rate, but also has good effect of inhibiting sedimentation after construction, and has the advantages of simpleness in structure and easiness in implementation and control.

The invention discloses a construction waste recycling drainage CFG pile foundation. The construction waste recycling drainage CFG pile foundation comprises a bearing stratum and a soil body. The bearing stratum is located below the soil body, a circular ring sand well is beaten in the soil body, concrete is poured in a circular ring of the sand well to form a pile, the axis of the sand well and the axis of the pile are located on the same straight line, the sand well and the pile are in the same depth, and the depth of the parts, entering the bearing stratum, of the sand well and the pile is not smaller than 0.5 m. The invention further discloses a construction method of the construction waste recycling drainage CFG pile foundation. The sand well drainage consolidation method and the CFG method are jointly applied to the foundation processing, a semi-rigid CFG pile serves as a pile core, the circular ring sand well is formed around the CFG pile, drainage consolidation processing is carried out on soft soil between the piles, and the load is jointly borne by the CFG pile and earth among pile through a cushion layer in a coordinated mode. The drainage consolidation of the foundation soil can be accelerated, the bearing capacity of the foundation is increased, resource utilization of construction waste is achieved, and environment pollution and construction cost are reduced.