58results about How to "Effective stress increase" patented technology

The invention discloses a static blasting and energy-gathering device. The static blasting and energy-gathering device comprises a main body protective barrel which is formed by splicing two circular-arc-shaped steel templates which are not connected, wherein a connecting line of middle points of the two circular-arc-shaped steel templates is perpendicular to a pre-splitting line; a splitting angle is arranged on the outer part of each circular-arc-shaped steel template, and the tip end of the splitting angle and the pre-splitting line are positioned on the same straight line. A method for blasting by applying the static blasting and energy-gathering device comprises the following steps: 1) drilling; 2) placing a static stone-breaking and energy-gathering device; 3) pouring stone breaker slurry for breaking stones; 4) recycling. According to the static blasting and energy-gathering device and the blasting method provided by the invention, the problems of long crushing time, high dosage for crushing and the like can be solved, the static crushing and blasting time is shortened, the dosage per crushing volume is reduced, and the crushing efficiency of a static crushing agent is improved.

The object of the invention is a method implemented in a computer for the numerical simulation of a porous medium that may comprise multiple interacting hydraulic fractures in continuous or naturally fractured medium. The method calculates numerically the propagation of a crack, or set of cracks, for instance under the fluid pressure imposed artificially through a well or perforation in a rock mass. This is accomplished by using the Finite Element Method and the special elements named zero-thickness interface or joint elements in the specialized literature, which are pre-inserted along all potential crack paths in the rock mass (pre-existing natural and artificial fractures plus main potential new fracture paths).

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 foundation pit support method of soft soil foundation. Vacuum preloading is carried on soft soil road sections as the foundation pit support is carried on undercrossing construction of the soft soil highway. The construction steps are as follow: firstly, cement-soil mixing piles are erected at the corresponding positions on ground at two sides of the undercrossing road section and the soft soil road section is divided into a plurality of closed areas by the cement-soil mixing piles; plastic drainage plates are erected in a certain space in each closed area; sand cushion is paved on the ground in each closed area and a filter strainer is embedded in the sand cushion; the sand cushion is covered by a sealing film so as to be separated from air; a vacuum pump is communicated with the filter strainer in the sand cushion and exhausts to discharge air in the sealing film; finally, vacuum value in the sealing film is kept to be more than 80 KPa. As the preloading of undercrossing road section is stopped, the foundation degree of consolidation is required to be more than 80% and then foundation pits in the undercrossing road section are excavated and parapets in the undercrossing road section are set.

The invention discloses supersaturated potassium chloride cement paste for well cementation. The cement paste is prepared from the following components: high sulfate-resistant G-grade cement, a salt-bearing fluid loss reducer, a preservative, a retarder, water, potassium chloride, a reinforced anti-migration additive, an expanding agent and a weighting agent. The supersaturated potassium chloride cement paste has the effects of stabilizing a well wall and improving the well wall strength; supersaturated potassium chloride assists a cement paste to resist the influence of mirabilite, gypsum, sodium, potassium, magnesium and other halite in an evaporite bed; the technology is reliable; the field construction is simple and convenient; the well cementation effect is good; the requirements on well cementation in the evaporite bed, a high-pressure deep well evaporite bed and a super-thick evaporite bed and other complex conditions can be met; the supersaturated potassium chloride cement paste has favorable application prospect particularly for the exploration and development of a potassium bittern water well.

The invention provides a method for carrying out dynamic compaction composite treatment on a sludge soil foundation through gravel piles, a drain board and an upper filling body, and belongs to the technical field of building foundation treatment. The method comprises the steps that S1, a construction cushion layer is laid; S2, construction of the gravel piles is achieved, and a vibration sunken tube method is adopted; S3, geotechnical cloth and a cushion layer below the tops of the gravel piles are laid; S4, construction of the plastic drain board is achieved; S5, an upper cushion layer and geotechnical cloth are laid; and S6, layered and staged dynamic compaction of the filling body is achieved. By means of the method, the advantages of preloading and dynamic compaction dynamic consolidation of the gravel piles and the plastic drain board are achieved fully, the advantages are complemented, and the defects of a single foundation treatment method are avoided.

A suction anchor rod device comprises a hollow columnar anchor rod. A bottom opening of the anchor rod is sealed, a top opening of the anchor rod is provided with a sealing cover plate, and the sealing cover plate and the anchor rod are detachably connected. The section, close to the bottom opening, of the anchor rod is defined as a bottom section, the section, close to the top opening, of the anchor rod is defined as a top section, a plurality of sieve holes are distributed in the side wall of the bottom section of the anchor rod, and the sieve holes communicate with an inner cavity of the anchor rod. A lifting disk is arranged in the anchor rod, the lifting disk is arranged in the anchor rod in the manner that the lifting disk can move up and down in the axial direction of the anchor rod through a lifting device, the lifting disk divides the inner cavity of the anchor rod into an upper cavity and a lower cavity, the cavity containing the top opening is defined as the upper cavity, and the cavity containing the bottom opening is defined as the lower cavity. The suction anchor rod device further comprises a pressure testing device used for testing the air pressure in the lower cavity and a pressure adjusting device used for adjusting the air pressure in the lower cavity. The suction anchor rod device utilizes the principle of effective stress, under the situation that the total stress is certain, the effective stress is improved by reducing the excess pore pressure, the anchor rod side friction is increased, and the overall stability and safety are improved.

The invention relates to a permeation grouting integrated rod suitable for a shield tunnel, and a construction method of the permeation grouting integrated rod. The permeation grouting integrated rodcomprises a tubular grouting rod, a tubular permeation rod and a grouting tube, wherein a plug is fixed to the head end of the grouting rod, the tail end of the grouting rod is sealed and fixedly connected with the head end of the permeation rod, a partition plate is fixed to the head end of the permeation rod, an end plate is fixed to the tail end of the permeation rod, slurry outlets are evenlyformed in the peripheral wall of the grouting rod, water penetration holes are evenly formed in the peripheral wall of the permeation rod, the grouting rod sequentially passes through the end plate and the partition plate and then extends into the grouting rod, a water outlet pipe is fixed on the end plate, and the water outlet pipe is communicated with the permeation rod after passing through theend plate. The permeation grouting integrated rod has the functions of grouting and drainage, thus can quickly and effectively dissipate excessive pore water pressure caused by shield tunneling, quickly improve the effective stress of a formation soil mass, improving the secondary grouting and grouting reinforcement effect during operation, integrates the permeation rod and the grouting rod, is convenient for installation and convenient to use, and is applicable to the fields of tunnel engineering, underground engineering seepage reinforcement and the like.

The invention discloses a foundation treatment system based on electric heating drainage plates. The foundation treatment system comprises the electric heating drainage plates, wherein each of the electric heating drainage plates comprises a plastic core plate, two layers of filter cloth wrap the periphery of the plastic core plate, and an electric heating wire is arranged in the interlayer between the two layers of filter cloth; the electric heating drainage plates are vertically arranged in the foundation, the head parts of the electric heating drainage plates are bound on filter tubes whichare transversely arranged, a pressure guiding and shunting device is arranged on the foundation, and water inlets of the pressure guiding and shunting device communicate with the filter tubes; a sandcushion is laid on the foundation, the water inlets of the pressure guiding and shunting device, the filter tubes and the head parts of the electric heating drainage plates are laid in the sand cushion, a heat preservation layer is laid on the sand cushion, a sealing film is laid on the heat preservation layer, the pressure guiding and shunting device penetrates through the sealing film, and thepressure guiding and shunting device is isolated from the sealing film; and a power supply wire of the electric heating wires of the electric heating drainage plates is led out of the sealing film through a film penetrating device and is connected with an external power supply, the edges of the sealing film is pressed into film pressing grooves, so that a closed vacuum pre-pressing system is formed.

The invention discloses a thermal-mechanical-electroosmosis multi-field coupling soft soil consolidation test box, which comprises an outer box body, a heating system, a slideway system, an electroosmosis system, and an air bag device; the outer box body is divided into a water storage area and a soft soil area by an inner partition plate, a water outlet is formed in the bottom of the inner partition plate, and geotechnical cloth is arranged; the heating system comprises a plurality of heaters which are longitudinally arranged in the soft soil area at intervals, and is connected with a heating temperature controller; the slideway system comprises a slide rail, a slide block and a corner brace, the slide rail is longitudinally arranged on the inner wall of the soft soil area, the slide block is arranged on the slide rail, and the heater is fixed on the slide rail through the corner brace; the electroosmosis system comprises a cathode plate and an anode plate which are respectively inserted into the soil samples on the two sides of the soft soil area to form a circuit; the air bag device comprises an air bag counterforce cover plate, an air bag and an air pressure servo control system. The device is simple in installation process, cheap and economical in manufacturing material price, high in operability and short in experiment period. Meanwhile, simulation boxes of different sizes can be manufactured according to different experimental schemes, and the device is economical and environmentally friendly.

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 present invention relates to a tidal zone and shallow water area petroleum sandstone artificial island construction method, in particular, it is a kind of artificial island quasi-precompression foundation treatment method. Said method includes the following steps: firstly, filling inshore weak clay layer surface with island body block stones to make the inshore weak clay layer surface be reached to artificial island construction and design standard before winter stoppage period and form foundation treatment heaped layer; then utilizing the packed island self-weight to increase effective stress of lower portion weak clay layer under sea-water so as to raise load-bearing capacity of foundation; after the sea is opened, continuously filling said weak clay layer with sandstone and mountain slope earth and rolling until the weak clay layer is reached to designed standard; finally, making upper portion building of island body.

The invention provides a reinforcing device for variable pressure and vacuum pumping of soft soil and an application method thereof. The reinforcing device for variable pressure and vacuum pumping ofthe soft soil comprises a vacuum pumping drainage mechanism arranged in silt, wherein the vacuum pumping drainage mechanism comprises drainage pipes horizontally arranged, first plastic drainage plates vertically arranged and a vacuum pump. The first plastic drainage plates are cavities which are formed by core plates located in the middle part and filter membranes coated on the outer sides of thecore plates, and the upper potion and the lower portion of the cavity are opened. The vacuum pump communicates with the upper ends of a plurality of first plastic drainage plates in a cavity shape through the drainage pipes, and a plurality of vacuum degree monitoring reflector are distributed on the core plates at height. According to the reinforcing device for variable pressure and vacuum pumping of the soft soil and the application method thereof, the problem that the pre-pressing vacuum degree is inadequate, the drainage plates is silted and blocked, and the drainage rate is too low can be solved.

The invention belongs to the technical field of weather-resistant hydrogel roadbeds, particularly relates to a weather-resistant hydrogel roadbed operation period water content and dense state regulation and control method, and provides the following scheme aiming at the problem that an existing roadbed is inconvenient to automatically regulate and control when the water content is too much or too little: the method comprises the following steps: S1, cleaning and compacting the surface of a foundation; S2, preparing a hydrogel roadbed filler; S3, laying the prepared hydrogel roadbed raw material on the surface of the foundation to form a first layer of improved roadbed; and S4, laying a plurality of layers of plain soil roadbed on the surface of the improved roadbed. The water absorption and release functions of the modified resin and the characteristics of the gel state are combined for mixed use, the roadbed is laid and improved in a layered mode, when the water content in the roadbed is increased to a certain threshold value, the modified resin can absorb water and is slightly swelled, a strength and compactness protection layer can be formed on the connection section of the foundation and the roadbed and the connection section of the roadbed and the pavement, and the pot cover effect is prevented.

The invention discloses a drainage structure for accelerating consolidation of a sludge soil dredged body of dam engineering and a construction method thereof. The drainage structure comprises a polder dyke, a levee, a sludge soil dredged area between the polder dyke and the levee, and a drainage channel formed in the sludge soil dredged area. The drainage channel comprises a plurality of drainageblind ditches which are horizontally located in the bottom of the sludge soil dredged area, and a plurality of drainage sand wells vertically arranged in the sludge soil dredged area, and the drainage blind ditches are used for bearing water flowing into or seeping from the drainage sand wells. By adopting the technical scheme, compared with the prior art, the drainage structure has the followingadvantages that the horizontal drainage blind ditches and the vertical drainage sand wells are arranged at the bottom of the sludge soil dredged area to form the three-dimensional drainage channel, the drainage capacity is greatly enhanced, pore water pressure dissipation is accelerated, soil effective stress is improved, and soil consolidation is accelerated.

The invention discloses a construction method for underwater well point dewatering reinforcement pile forming. The construction method comprises the following steps that S1, the initial water level and the mud surface depth are determined, and well point measuring and positioning are completed; S2, pressing a dewatering well pipe into the bottom mud; S3, a pore water pressure gauge and a submersible pump are placed in a dewatering well casing, and water pumping is tested; S4, after test water pumping is completed, the submersible pump and a drainage pipe are connected; S5, a water pumping system is started, and water pumping is stopped when the water level meets the design requirement; and S6, the dewatering well pipe is taken out, and gravel is backfilled. According to the construction method, the operation process is simple, the construction period is short, the construction sequence of dewatering firstly and then backfilling and pile forming in a well pipe hole is adopted, tube well point dewatering and backfilling and pile forming in the well pipe hole are combined, the underwater soft foundation is reinforced, the bearing capacity of the soft foundation is effectively improved, and good engineering application prospects are achieved.