36results about How to "Improve resistance to liquefaction" patented technology

The invention discloses an anti-liquefaction three-dimensional drainage rigid pile and a construction method thereof. Multiple grooves are vertically formed in the side surface of the rigid pile; vertical drainage bodies are arranged in the grooves; multiple grooves are transversely formed in the side surface of the rigid pile; transverse drainage bodies are arranged in the grooves; the depths of the vertical grooves and the vertical drainage bodies can reach the bottom of a liquefied soil layer; and the transverse grooves and the transverse drainage bodies are arranged on a pile body in a range of the liquefied soil layer. The vertical drainage bodies and the transverse drainage bodies are fixed in the grooves; and layers of steel wire meshes cover the surfaces of the drainage bodies.

The invention discloses a stirring pile-permeable concrete pile compound foundation, which comprises a plurality of rows of stirring piles and permeable concrete piles, wherein the stirring piles and the permeable concrete piles are arranged in a row spacing way; and a gravel cushion layer is paved on the surface of the foundation on the upper parts of the stirring piles and the permeable concrete piles. The invention discloses a method for treating the foundation simultaneously. The compound foundation has high bearing capability and high permeability, post-construction settlement can be effectively reduced, and the liquefaction resistance of the foundation can be improved. Meanwhile, under the action of drainage consolidation, the compound foundation can be used for eliminating engineering diseases caused by stirring pile construction.

The invention provides a seepage eliminating system for lowering a tailing pond dam body seepage line by using mining barren rocks and a construction method thereof. The seepage eliminating system comprises barren rock columns arranged in a dam body along a dam central axis, transverse seepage eliminating blind grooves arranged on a tailing sand deposition surface in the dam body along the dam central axis, and longitudinal seepage eliminating pipes arranged in the dam body perpendicular to the dam central axis. The barren rocks without economical value are used for producing the barrel rock columns to cooperate with the transverse seepage eliminating blind grooves and the longitudinal seepage eliminating pipes to form the seepage eliminating system capable of realizing self-flowing. The mining barren rocks are excellent in seepage performance, so that the seepage speed of seepage water in a tailing dam can be accelerated, the liquefication resistance of the tailing dam is improved, and the liquefication area of the dam body is reduced; the seepage eliminating system is low in cost, convenient to construct and popularize and higher in commercial value; and meanwhile, through limitations of specification parameters and arrangement modes of the barren rock columns, the drainage solidification of tailing sand can be accelerated, and the stability of a tailing pond can be improved.

The invention relates to a method of eliminating liquefaction in a shield tunnel stratum in a tunnel and aims to provide the method of eliminating liquefaction in the shield tunnel stratum in the tunnel to solve the problem of stratum liquefaction under the condition of densely covered building structures. The technical scheme of the invention is that a group of annular linings formed by assembling concrete segments are sequentially spliced into permanent linings of a tunnel along the tunnel direction, and a group of pumping holes are evenly arranged on horizontal center lines on two sides of each annular lining and the part below along the radial direction; a water pipe is arranged on each pumping hole by using the casing process, one end of each water pipe penetrates through the annular linings to extend into the liquefied stratum, multiple drainage holes are formed in the surface of each water pipe, and a filtering membrane wraps each water pipe; a rubber branched pipe is communicated with the other end of each water pipe to be connected with a vacuum pump to realize a header pipe for pumping; the vacuum pump is started, thus vacuum is formed within the liquefied stratum surrounding the annular linings, and a given vacuum 80 kPa is maintained until the underground water level within the double tunnel diameter depth range up and down left and right outside the tunnel is decreased by 7-10m; the pipe grouting is maintained to fill the drainage holes.

The invention discloses a discrete pile-water permeability concrete pile novel binary composite foundation, which comprises concrete piles and water permeability concrete piles, wherein the concrete piles and the water permeability concrete piles are alternately arranged in rows, and the foundation surfaces of the upper parts of the concrete piles and the water permeability concrete piles are provided with broken stone hardcores. The invention also discloses a treatment method of the composite foundation. The composite foundation belongs to a binary foundation treatment mode integrating high bearing performance and high water discharge performance, the post-construction settlement of the foundation can be reduced, and in addition, the liquefaction resistance capability of the foundation can be effectively improved. In addition, during the concrete pile construction, hyperstatic pore water pressure can be generated in the foundation, the ground surface doming (cohesive soil layers) and the pile settlement (sandy soil layers) can be caused, and the occurrence of engineering harm can be prevented through reducing hyperstatic pore water pressure during the concrete pile construction via the arrangement of the water permeability concrete piles.

The invention relates to a fly ash and soil composite material used in highway roadbed and is characterized in that the material consists of fly ash, soil and polypropylene fiber; the technique is simple and reliable to ensure that the fly ash and soil composite material has good frost resistance property; the unconfined compressive strength of the fly ash and soil which is doped with the polypropylene fiber is 1.26 to 1.74 times higher than the unconfined compressive strength of pure fly ash and soil. According to the characteristics of roadbed freezing injury mechanism and structural style in seasonal frozen areas, the fly ash and soil composite material of the invention adopts novel materials which have the advantages of good resistance to freezing and thawing, high strength, low cost and environmental protection as the roadbed filler, which not only has theoretical guidance meaning, but also has direct practical meaning for solving engineering problems.

The invention belongs to the field of foundation reinforcing engineering, and relates to an embankment reinforcing system for liquefiable site reinforced gravel pile composite foundation and a reinforcing method. The reinforcing system involves two-way reinforced gravel piles, a sheet pile wall, a geotextile cushion layer, a geogrid reinforced gravel cushion layer, a horizontal drainage channel, drainage ditches, a sand cushion layer, an embankment filling layer and an asphalt concrete surface layer, wherein the reinforced gravel piles are constructed through a vibroflotation method and are arranged in a square shape to form a vertical drainage channel, the geotextile cushion layer, the geogrid reinforced gravel cushion layer and a second geotextile cushion layer are sequentially laid on the upper portions of the two-way reinforced gravel piles to jointly form the horizontal drainage channel, the drainage ditches are formed in the two sides of the horizontal drainage channel, the sand cushion layer is arranged at the top of the horizontal drainage channel, and finally, the embankment filling layer is built on the top surface of the sand cushion layer. The embankment reinforcing system for the liquefiable site reinforced gravel pile composite foundation and the reinforcing method are easy and convenient to construct, short in construction period, low in cost, higher in bearing capacity and liquefying resistance, the embankment reinforcing system for the liquefiable site reinforced gravel pile composite foundation and the reinforcing method which are economical and efficient are provided.

The invention provides an anti-liquefaction treatment method for a liquefiable foundation. The anti-liquefaction treatment method comprises the following steps that a broken stone hardcore is laid, and specifically the broken stone hardcore with the preset thickness is laid on the surface of the liquefiable foundation; drainage plate construction is conducted, wherein the construction positions ofgravel piles are determined, the gravel piles are arranged in a regular triangle or square shape, and drainage plates are inserted into the geometric centers of the gravel piles arranged in the regular triangle or square shape; gravel pile construction is carried out; the broken stone hardcore is continuously laid, and the broken stone hardcore is laid to the designed thickness according to the designed thickness of the broken stone hardcore; and a non-liquefied soil layer is laid. The anti-liquefaction treatment method aims to overcome the defects of an existing anti-liquefaction treatment method for the liquefiable foundation.

The invention provides a construction method of engineering foundation pre-soaking dynamic consolidation. The construction method includes the following steps that 1, the construction range is determined, and the thickness of blow filling sand is measured; 2, sites and the number of laid plastic drainage plates in the construction range are determined, and the arranged depth of the plastic drainage plates is determined; 3, the plastic drainage plates are laid, and a blow filling sand foundation is subjected to vibroflotation and drainage through a conventional vibroflot; 4, water with the preset water yield is sprayed into the construction range of the blow filling sand foundation by prefabricated pre-soaking ramming equipment so as to maintain the preset water content of the blow fillingsand foundation, then dynamic consolidation is carried out by the pre-soaking ramming equipment, and fixed point spraying of ramming points is carried out by the pre-soaking ramming equipment in the process of dynamic consolidation so as to ensure no dust; and 5, the foundation bearing capacity and liquefaction resistance performance are detected. According to the construction method of engineering foundation pre-soaking dynamic consolidation, the problems that the quality of dynamic consolidation and subsequent vibration rolling construction is affected and the environment is polluted due tothe fact that a surface layer is difficult to be compacted in the treatment process of the existing blow filling sand foundation are effectively solved.

The invention discloses an in-hole treatment method for a shield tunnel in a liquefiable stratum, and belongs to the technical field of tunnel shield construction. The invention aims to solve the shield construction risk of the liquefiable stratum. The method comprises the following steps of synchronously grouting and replacing pore water; cutting off pore water through secondary grouting; and carrying out in-hole anti-liquefaction treatment. While the shield tail gap of the liquefiable stratum is prevented from being formed, separated-out pore water is used for diluting slurry, and the grouting filling effect is guaranteed; pore water is prevented from flowing and gathering along a formed tunnel, and synchronous grouting slurry which is not initially set is limited to longitudinally flow due to the gradient of the tunnel; and the anti-liquefaction capability of the shield tunnel is improved, the construction cost is reduced, and the construction period is shortened. Compared with a traditional method for conducting full-section reinforcement treatment on a liquefied soil layer from the ground through cement-soil mixing piles and high-pressure jet grouting piles, targeted local stratum treatment can be conducted under the condition that the ground does not meet the construction condition.

The invention discloses an inverted filter material water permeable pile composite foundation and a water permeable rate measuring device and method thereof. The composite foundation comprises recycled concrete water permeable piles, prestressed concrete piles, geotextile wrapping the recycled concrete water permeable piles and a mattress layer laid at the tops of the water permeable piles. The measuring device comprises a sleeve, an inner support arranged in the sleeve, a pervious concrete test piece arranged on the inner support and geotextile wrapping a water permeable concrete test piece.Waste concrete is recycled to be made into recycled concrete, the recycled concrete is combined with the geotextile, resources are saved, meanwhile, the foundation has good water permeability, water can be drained to the maximum extent, sandy soil is reserved, piping and quicksand caused by hydraulic power are prevented, the bearing capacity of the foundation is improved, and sedimentation of a building is reduced; the corresponding water permeable rate testing device is simple in structure, the testing method is convenient to use, and the water permeable performance of the water permeable concrete and the impermeability of a concrete test block can be rapidly detected.

The invention relates to the technical field of foundation treatment and foundation reinforcement, in particular to a foundation leveling system for controlling settlement of a storage terrace and a construction method thereof. The system is characterized in that the system comprises a plurality of structural pile foundations, a plurality of leveling pile foundations, flexible foundation separation belts and horizontal reinforcement bodies, wherein the structural pile foundations and the leveling pile foundations are uniformly arrayed, the flexible foundation separation belts correspondingly connect the structural pile foundations and the leveling pile foundations one by one and divide a foundation into a plurality of chambers, and the horizontal reinforcement bodies are arranged at the upper part of the flexible foundation separation belt and support a structural layer of the storage terrace. The foundation leveling system for controlling settlement of the storage terrace and the construction method thereof have the advantages that the foundation leveling system is suitable for large-area ground load, especially terrace settlement control of buildings such as factories, workshopsand warehouses, and have the advantages of short construction period, controllable construction quality, low engineering cost, good anti-seismic effect, high bearing capacity, small uneven settlementand the like.