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14939 results about "Geotechnical engineering" patented technology

Geotechnical engineering is the branch of civil engineering concerned with the engineering behavior of earth materials. Geotechnical engineering is important in civil engineering, but also has applications in military, mining, petroleum and other engineering disciplines that are concerned with construction occurring on the surface or within the ground. Geotechnical engineering uses principles of soil mechanics and rock mechanics to investigate subsurface conditions and materials; determine the relevant physical/mechanical and chemical properties of these materials; evaluate stability of natural slopes and man-made soil deposits; assess risks posed by site conditions; design earthworks and structure foundations; and monitor site conditions, earthwork and foundation construction.

Tunnel lining self waterproof drainage system

The invention relates to a tunnel lining self waterproof drainage system, which comprises a surrounding rock bearing arch, a cast-in-place cement main waterproof layer, a pre-cast cement arch sheet layer and longitudinal drainage channels. Arch sheet layer construction gaps and cast-in-place cement main waterproof layer construction gaps are interlaced. The tunnel lining self waterproof drainage system is characterized in that movable drainage grooves are fixedly arranged below the pre-cast cement arch sheet layer of centralized bursting water seepage points of loose surrounding rocks, and form arch sheet drainage spaces with an inwards concave surface of the pre-cast cement arch sheet layer, the parallel drainage spaces distributed along the section of a tunnel form a movable drainage channel, the longitudinal drainage channels are communicated and are arranged on two sides of the movable drainage channel and the pavement of the tunnel, pre-embedded water guiding pipes are arranged at the centralized bursting water seepage points, a water outlet end of each pre-embedded water guiding pipe is arranged on the inwards concave surface of the pre-cast cement arch sheet layer, and pre-embedded grouting pipes are arranged outside the pre-embedded water guiding pipes. The invention completely solves stubborn problems of the tunnel on cracking, seeping, frost heaving, ponding or freezing and the like on the premise of not arranging an interlayer waterproof layer and a hidden seepage water blind pipe drainage system, and the tunnel lining self waterproof drainage system disclosed by the invention has a simple structure and is convenient to construct.
Owner:中国市政工程西北设计研究院有限公司

Multifunctional assembly type physical similarity testing system for geotechnical engineering

The invention relates to a multifunctional assembly type physical similarity testing system for geotechnical engineering. The multifunctional assembly type physical similarity testing system is characterized by comprising a model box, a loading device and a data acquisition unit, wherein the model box comprises a left side plate, a right side plate, a front side plate, a rear side plate and a bottom plate which are detachably assembled; the loading device comprises a test rack, a sensor, a jack and a control panel, the jack can be glidingly arranged on the test rack in horizontal transverse direction and/or horizontal longitudinal direction and located above the model box, the sensor is arranged above the jack, and the control panel is connected with the jack and the sensor and controls and records data information of the jack and the sensor; the loading device is arranged above the model box; the data acquisition unit is used for acquiring and recording data information of a geotechnical engineering simulation model in the model box. The multifunctional assembly type physical similarity testing system has the advantages that pertinence and accuracy during testing are improved, the rate of utilization of the testing system is increased, and the system can be applied to simulation testing of geotechnical engineering issues such as a slope, excavation of a foundation pit, a pile foundation, a composite foundation, soil anchoring and the like.
Owner:SHENYANG ZHONGJIAN DONGSHE GEOTECHN ENG

Novel highway embankment widened structure and construction method

The invention relates to a novel highway embankment widened structure. The original roadbed slope of the structure is trimmed into a step shape, a high pressure jet grouting pile is disposed below an original roadbed slope cushion layer, pressurized continuous grouting is employed at an original roadbed cushion layer to form a slurry solid bearing plate, parts of pore cavities of the original roadbed are recharged with fine aggregate concrete or mortar; foundation treatment piles are employed to reinforce the foundation of a widened area, a drainage cushion layer is laid throughout the top of the foundation treatment piles; an earthwork cloth is laid on the drainage cushion layer, a cement soil plate is disposed on the earthwork cloth, high strength reinforcing mesh sheets are disposed in the cement soil plate; and the widened area embankment is formed by layered filling of excavation soil and light filler in a construction process. The structure provided by the invention can reinforce the bearing capacity of roadbed soil on both sides of the widened area and the original roadbed slope strength, and enhance the integrality of the embankment structure, reduce longitudinal cracks induced by differential settlement and the like at the juncture of new and old roadbeds, thus having good technical and economic benefits. The invention also discloses a construction method of the novel highway embankment widened structure.
Owner:HANGZHOU HUASHUI MUNICIPAL ENG

Indoor pull-out test apparatus for anchor rod

InactiveCN103398901ASolve the problem that the expansion shell bolt pull-out test cannot be carried outOvercoming the limitations of inconvenient monitoring of anchor mechanical responseMaterial strength using tensile/compressive forcesAcoustic emissionGeotechnical engineering
The invention relates to an indoor pull-out test apparatus for an anchor rod, which belongs to the technical field of geotechnical engineering. The apparatus comprises a horizontal loading system, a vertical loading system, an anchor rod pulling system, a box, support columns and a bearing plate. The test apparatus can realize loading of a sample at two horizontal directions and a vertical direction and overcomes the problem that a traditional indoor pull-out test apparatus for an anchor rod cannot carry out pull-out test under loading conditions; the test apparatus is provided with an acoustic emission sensor, can realize whole-course monitoring of damage, breakage and generation and expansion of cracks in the sample during pull-out test of the anchor rod and overcomes the limitation that mechanical response of an anchoring body cannot be conveniently monitored in traditional indoor pull-out test. The test apparatus provided by the invention can be applied in pull-out experimental study of mechanical behaviors of an expansion shell anchor rod and a corresponding anchoring body in geotechnical engineering so as to provide scientific experimental bases for test of anchoring performance of the expansion shell anchor rod and can also be applied in pull-out experimental study of a bond-type anchor rod.
Owner:INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI

Rock asphalt composite modifier as well as preparation method and application thereof

InactiveCN103613940AFacilitate the promotion of applicationsConducive to promoting developmentBuilding insulationsEconomic benefitsRoad surface
The invention relates to a rock asphalt composite modifier as well as a preparation method and application thereof. The rock asphalt composite modifier is compounded from 10-90% of rock asphalt and 10-90% of an admixture, and can improve the high-low temperature performance of asphalt and reduce the temperature sensibility of the asphalt when being added into matrix asphalt. The rock asphalt composite modifier disclosed by the invention can be used for preparing a composite modified asphalt mixture and can make up the defects including poor storage stability, high price and high compatibility requirement for the matrix asphalt of intra-industry ordinary SBS (styrene-butadiene-styrene) modified asphalt at present; the rock asphalt composite modifier can reduce the mixing temperature of the asphalt mixture, improve the adhesion to stones and then delay the time of problems including pavement ruts, displacement, embracement, cracks, loose falling and the like, so that the service life of a road is prolonged. The rock asphalt composite modifier disclosed by the invention not only achieves an effect of modifying the performance of asphalt but also can reduce the asphalt dosage of the asphalt mixture, so that road mechanical properties of a pavement are improved, the construction cost is saved, and very good social and economic benefits are achieved.
Owner:TONGJI UNIV

Mine roadway advancing and undermining method and main blasting parameters

The invention relates to a mine roadway advancing and undermining method and main blasting parameters. The mine roadway advancing and undermining method is characterized in that blast holes are arranged in a double-lug cracking undermining mode, the nine undermined blast holes are perpendicular to an upright working face and are arranged along an area which is below the center of the working face and separated from the center of the working face by the distance ranging from 10cm to 30cm, and form a cross, the central blast hole and the four end blast holes are charging holes, and holes among the central blast hole and the four end blast holes are empty holes; and vertical cracking undermined holes are detonated at first to form a cracking seam, and then the double-lug undermined holes are detonated, so that a prismatic slot cavity centered at the cross is formed. The main roadway advancing blasting parameters include the diameter of each blast hole, the pitch between each two blast holes, the depth of each blast hole, the number of the blast holes and specific explosive consumption. The empty holes used as free faces are added among the charging undermined holes arranged by the double-lug cracking undermining method, the millisecond blasting technology is adopted, and the blasting free faces are added, so that a clamping effect of ore rock is relieved, smooth undermining can be realized, and blast hole utilization rate can be increased to a great extent.
Owner:江西岿美山钨业有限公司

Gas drainage method combining surface and underground fracturing and permeability improvement

The invention relates to a gas drainage method combining surface and underground fracturing and permeability improvement, and the method comprises the following steps: building underground large-diameter directional long boreholes in a coal reservoir or the top and bottom plates thereof under a coal mine by using a drilling machine; then building pressure relief holes in a coal bed having an appropriate distance with the large-diameter directional long boreholes; building vertical wells communicated with an underground large-diameter directional long borehole filed or nearby roadways thereof from the ground to the underground; firmly connecting large ground fracturing equipment, a ground vertical well shaft and the underground large-diameter directional long boreholes by using high pressure pipelines; carrying out fracturing on each underground large-diameter directional long borehole by using the large ground fracturing equipment to form a three-dimensional fracture network; discharging water in the underground large-diameter directional long boreholes and then carrying out continuous pressure extraction on fracturing holes and the pressure relief holes; and quickly extracting out the coal bed gas through negative pressure by using the three-dimensional fracture network. According to the invention, the coal bed gas can be extracted out quickly with high efficiency by using the three-dimensional fracture network and negative pressure, thereby providing a technical guarantee for safe and high-efficiency production of mines; and the method has the advantage of wide application prospect.
Owner:HENAN COAL CHEM IND GROUP INST

Indoor experiment shaft device and method for synchronous or asynchronous multistage clustering fracturing of two horizontal wells

The invention provides an indoor experiment shaft device for synchronous or asynchronous multistage clustering fracturing of two horizontal wells and a simulation method. The device and simulation method are used for indoor experiment simulation of synchronous or asynchronous multistage clustering fracturing of two shale horizontal wells. A designed multistage clustering fracturing experiment shaft can simulate influences of the number of horizontal well fracturing segments, number of perforation clusters, perforation parameters and the like on synchronous or asynchronous fracturing fracture shapes. The experiment scheme comprises the six steps of making of an experiment scheme, machining of a special experiment shaft, machining of a test piece, preparation of fracturing fluid, an extended experiment of fracturing fractures, and CT scanning of an experiment result. The novel fracturing experiment shaft and method are provided for shale reservoir fracturing research, can simulate the joint network fracturing fracture distribution of a reservoir in multistage clustering synchronous fracturing of two horizontal wells or multistage clustering asynchronous fracturing of two wells front and back, and can provide theoretical support for shale reservoir fracturing experiment research and fracturing construction.
Owner:CHONGQING INST OF GEOLOGY & MINERAL RESOURCES

Drilling method for printed circuit board (PCB)

The invention provides a drilling method for a printed circuit board (PCB). The method comprises the following steps of: 1, providing a PCB to be drilled, and determining drilling depth of a front surface and drilling depth of a back surface according to the thickness of the PCB; 2, providing a cover plate and a drilling cutter, and determining the length of a blade of the drilling cutter according to the drilling depth of the front surface and the drilling depth of the back surface of the PCB and the thickness of the cover plate; 3, determining a coordinate system for drilling on the front surface of the PCB, drilling positioning holes on the front surface of the PCB, arranging the cover plate on the front surface of the PCB and fixing the PCB and the cover plate respectively; 4, drilling through the cover plate by using the drilling cutter, drilling from the front surface of the PCB to form a half hole according to the drilling depth of the front surface of the PCB, and then feeding the PCB; 5, inverting the PCB, determining a coordinate system for drilling on the back surface of the PCB, drilling positioning holes on the back surface of the PCB, arranging the cover plate on the back surface of the PCB and fixing the PCB and the cover plate respectively; and 6, drilling through the cover plate by using the drilling cutter, drilling from the back surface of the PCB to be communicated with the half hole to form a through hole according to the drilling depth of the back surface of the PCB, and feeding the PCB. In the method, a short-blade long drilling cutter is used for drilling from the two ends of the front surface and the back surface of the hole respectively, so a thicker PCB can be drilled through; and the method has the advantages of lower cost, higher drilling position accuracy and difficulty in breaking the cutter.
Owner:DONGGUAN SHENGYI ELECTRONICS

Explosion expanded internal anchor head prestressed anchor cable for strengthening weak rock and anchoring method thereof

InactiveCN102002947AExpand the force rangeIncrease safety reserveBulkheads/pilesAnchoring boltsTEX-explosivePre stress
The invention discloses an explosion expanded internal anchor prestressed anchor cable for strengthening a weak rock and an anchoring method thereof. The anchor cable comprises a bit expanded anchor cable hole and an anchor cable body with an explosion expanded internal anchor head, wherein the explosion expanded internal anchor head consists of a lantern-shaped steel frame and a grouting body; and the lantern-shaped steel frame comprises lanced steel tubes, wire meshes and detached steel strands which are hierarchically distributed from the interior to the exterior. The anchoring method comprises the following steps of: drilling an anchor cable hole by using a driller, putting explosive at the bottom of the hole for explosion after holing, cleaning the hole and making a spherical cavity formed at the bottom of the drilled hole; simultaneously making an initial sample of the explosion expanded internal anchor head anchor cable by using the steel strands, the steel tubes, the wire meshes, the explosive and the like, inserting the anchor cable, igniting the explosive in the initial sample of the anchor cable, and forming the lantern-shaped internal anchor head steel frame; and finally grouting, and stretching and locking the anchor cable. The invention can obviously improve the bearing capacity of the internal anchor head grouting body and the prestress of the anchor cable, effectively solves the problem of poor anchored force of the anchor cable in the process of strengthening the weak rock, and can shorten the length of the internal anchoring section and widen an effective range of anchoring the rock.
Owner:WUHAN UNIV
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