282results about How to "Improve self stability" patented technology

The invention relates to the field of tunnel engineering construction, in particular to a control method of surrounding rocks in water-rich very-broken surrounding rock tunnel collapse sections. According to the control method, problems in the existing methods that managing circle is long, reinforcing range and effect are bad, secondary geological disasters are triggered easily because of deformation and cracking of exceeding clearance limit of preliminary bracing and the like are solved. The method includes the following steps: searching and analyzing factors leading to collapse and disaster degree, stabilizing exposed face of an accumulation body and dewatering and decompressing deep parts, strengthening supporting intensity in the collapse sections and influencing areas, outburst prevention filling and strengthening the collapse accumulation body, grouting reinforcing asymmetrical peripheral curtains, confirming an excavating method in grouting reinforcing collapse sections and primary supporting patterns, replenishing grouting in parts, excavating inverted arches, and constructing second liners. The control method of surrounding rocks in water-rich very-broken surrounding rock tunnel collapse sections has the advantages that collapse disposing construction period of water-rich very-broken surrounding rock tunnels is shortened, reinforcing range and intensity of the surrounding rocks are guaranteed, grouting reinforcement is fully conducted on the surrounding rocks in direct collapse areas, deformation in the preliminary bracing is relieved, occurrence of the exceeding clearance limit and the secondary geological disasters is avoided, disposing quality of collapse accidents is improved effectively, and good social benefit and economical benefit are created.

The invention relates to the field of tunnel construction, in particular to a method for constructing a metamorphic rock confined water tunnel, which solves the problems of the current method that geological disaster is easily initiated, the digging outline is difficult to control, timbering at initial stage is easy to transform and craze and the collapse is easy to occur. The method comprises the steps of: preliminarily forecasting surrounding rock level and underground water developing condition, accurately forecasting the geologic condition and the underground water developing condition by an advanced prospect hole, draining and decreasing water pressure by an advanced borehole, fixing the surrounding rock and plugging water by grouting via an advanced ductile, choosing a digging manner of tunnel trunk, determining the timbering form at initial stage, constructing a radial ductile, digging an inverted arch, pouring inverted arch concrete, and constructing a secondary lining. The construction method of the invention can efficiently control the digging outline, decrease the collapse frequency and the scale, efficiently control the transformation and cracking of the timbering at initial stage and can almost avoid the tunnel collapse by secondarily exchanging arch. The cost is decreased and the construction quality and the construction safety are efficiently promoted so as to bring excellent social benefit.

The invention discloses a supporting method for soft broken nonuniform stratum tunnel construction. The supporting method includes the steps that firstly, an arch support is erected in a bottom layer tunnel through steel pipes, and the portion, on the top of the arch support, of the bottom layer tunnel is drilled; secondly, a small pipe roof is constructed on the drilled portion of the arch crown of the arch support; thirdly, during construction of the small pipe roof for supporting, advanced reinforcement treatment is conducted on a top arch of the tunnel through advanced small pipes in a floor staggered mode; fourthly, the tunnel is excavated; fifthly, after the tunnel is excavated, preliminary supporting construction is conducted in time each cycle; sixthly, after excavation and supporting of a tunnel trunk of the tunnel, an inverted arch is constructed and sealed into a loop; and then secondary lining following operation is conducted. The method has the advantages that deformation of tunnel surrounding rocks can be effectively reduced, self-stabilization and seepage prevention capacity of the tunnel is permanently improved, a multifunctional surrounding rock reinforcement region is formed, and safety of tunnel constructors and equipment is guaranteed.

The invention relates to a tunnel lining rapid repair structure based on a carbon fiber woven mesh and a repair method thereof. The tunnel lining rapid repair structure based on the carbon fiber woven mesh comprises self-propelled hollow grouting anchors, joist steel, the carbon fiber woven mesh, U-shaped hooks and a composite mortar layer. The joist steel is arranged on a tunnel lining to be repaired, one end of each self-propelled hollow grouting anchor stretches into the tunnel lining to be repaired in the radial direction of the tunnel lining to be repaired, the other end of each self-propelled hollow grouting anchor is connected with joist steel, the carbon fiber woven mesh is laid on the inner wall of the tunnel lining to be repaired and connected with the joist steel through the U-shaped hooks, and the composite mortar layer is sprayed on the inner surface of the carbon fiber woven mesh. The tunnel lining rapid repair structure based on the carbon fiber woven mesh and the repair method thereof aims to solve the problems existing in the existing tunnel lining reinforcing technology, the structure is reasonable in design, the mechanical property is good the steps of the method is simple, the operability is high, and the project cost is low.

The invention provides soil activating powder; the components are as follows in parts by weight: 50 to 70 parts of organic fermentation product, 10 to 25 parts of sucrose, 15 to 35 parts of straw green powder, 5 to 10 parts of bacterial cellulose, 3 to 7 parts of Xanthan, 5 to 15 parts of humic acid, 0.05 to 0.2 part of pH buffer, and 0.1 to 0.5 part of soil disinfectant. The soil activating powder can comprehensively improve and control the physical structure, the fertility, the microbial activity, the water characteristics, the cohesion anti-erosion capability and the like of the soil, has the advantages of strong functions, low cost, simple use, applicability to the improvement of various poor degraded soil and the like, and is mainly used for the improvement of various poor soil.

The invention relates to the technical field of tunnel engineering and discloses a method for processing a grouting position of a hidden cave at the bottom of a tunnel. The processing method includes the steps that firstly, cave detection is conducted, wherein an advance geological forecast method is comprehensively used for determining the position of the cave at the bottom of the tunnel according to the position of the bottom of the tunnel, and the position where the hidden cave is detected is marked; secondly, a second hole site is designed, the position of a grouting hole is designed based on the first step according to the two-dimensional stress distribution condition around a round hole in an elastic flat plate; thirdly, grouting is conducted, jet grouting is conducted on the stress concentrated part of the hidden cave for strengthening; fourthly, grouting is conducted, a compaction grouting technology is used for filling a hidden cave body. According to the method for processing the grouting position of the hidden cave at the bottom of the tunnel, the two-dimensional stress distribution state around the round hole in the elastic flat plate serve as the theoretical basis, the defect that construction is conducted by mainly relying on experience in the past is overcome, the stability of tunnel surrounding rock on the upper portion of the hidden cave is ensured, and the normal operation of the rear stage of the tunnel is ensured.

The invention discloses a soil stabilization structure and method for railway yard shield tunneling construction. Grouting holes stretching into the bottom of a rail track obliquely are formed in the two sides of a platform, double liquid grout contained in a sleeve valve pipe in each grouting hole condenses to form a reinforcing rod and a grout connecting ball outside the reinforcing rod, the grouting holes in each side are quincuncial, the grouting holes in the two sides are arranged in parallel in a staggered mode, every two adjacent grout connecting balls on the same side are connected, the grout connecting balls on the two sides are connected to form an integrated stereo netty structure, and then a stereo netty reinforcing structure is formed for the soil under the rail track, the strength and self-stability of the soil are improved, and shield tunneling construction is facilitated.

The invention discloses an underwater towing body controlled by a front-edge-rotating cylindrical wing. Forced sinking hydrofoils of the underwater towing body adopt symmetrical airfoil profiles, andare symmetrically arranged on the two sides of the front portion of a main cavity, two rotating cylinders are symmetrically arranged at the front ends of the profile faces of the forced sinking hydrofoils relative to the main cavity, and are connected with a speed adjusting motor located inside the main cavity through rotating-cylinder rotating shafts; ducted propellers are symmetrically arrangedon the two sides of the back ends of the forced sinking hydrofoils; a transverse horizontal fixed empennage is arranged at the tai lend of the main cavity, and vertical streamlined flap type rudders are symmetrically arranged at the two ends of the transverse horizontal fixed empennage respectively; a flap is arranged at the tail end of each vertical streamlined flap type rudder, and is connectedwith a flap angle control device. According to the underwater towing body controlled by the front-edge-rotating cylindrical wing, by changing the rotating speeds and the rotating directions of the rotating cylinders at the front ends of the forced sinking hydrofoils, attack angles of the forced sinking hydrofoils can be efficiently and flexibly adjusted, and the aim of changing the motion trail ofthe vertical direction of the towing body is achieved; on this basis, the thrust directions of two-side propellers are changed through assisting, and directional floating and sinking can be achieved.

The invention discloses a preparation method of perovskite catalytic persulfate. The method comprises the following steps that (1) La(NO3)3 6H2O, Fe(NO3)3 9H2O and C6H8O7 H2O are respectively weighed according to the mol ratio of La:Co:CA being 1:1:2; water is added so that the raw materials are dissolved; stirring is performed for 12h under the room temperature condition; a precursor solution is obtained; (2) the prepared precursor solution is put into a 80 DEG C water bath heating pot for still standing for 12h, so that the prepared precursor solution completely becomes gel; (3) the raw materials are put in a vacuum drying box for 12h to be dried; (4) the temperature of a muffle furnace is raised to 50 DEG C at a speed being 5 DEG C/min; calcination is performed for 3h; a catalyst of LaFeO3 powder is obtained; (5) the calcined LaFeO3 powder is ground into uniform fine particles for use. The perovskite catalyst LaFeO3 can efficiently activate persulfate; SO4 - with high oxidative activity is produced; the removal of non-degradable medicine pollutants is completed; the water quality is obviously improved; the water quality safety is guaranteed. La(NO3)3 6H2O and Fe(NO3)3 9H2O which are cheap and are easily obtained are used as major preparation raw materials; the perovskite catalyst LaFeO3 is prepared through work procedures of water bath, gelling, drying, calcinations and grinding.

The invention relates to a double-layer anchoring and balancing arch supporting system for a coal roadway with extremely-weak top plates. A roadway waste section is enlarged to be reserved for deformation, the roadway section is a tangential arching breaking face, a metal net and a reinforcing steel bar stair joist is laid on the surface of the roadway, anchor rods are installed on the top plate of the roadway and on sides of the roadway and penetrate through the metal net and the reinforcing steel bar stair joist to be anchored into a coal bed through an anchoring agent, anchor rod trays are used for exerting pretightening forces on anchor rods to form anchor net preliminary supporting, anchor cables are installed among anchor rods on the top plate of the roadway and penetrate through the metal net and the reinforcing steel bar stair joist to be anchored into the coal bed through the anchoring agent, and anchor cable trays and locks are used for exerting pretightening forces on anchor cables to form secondary prestress anchor cable reinforcing supporting. The double-layer anchoring and balancing arch supporting system for the coal roadway with extremely-weak top plates is low in construction cost, good in supporting effect, simple, practical and economical.

The invention discloses an excavation method for a tunnel passing through a high-angle thrust water-rich and sand-rich fault. A construction tunnel hole is divided from the top to the bottom into an upper hole body, a central hole body, and a lower hole body, wherein the upper hole body is divided into a left guide hole and a right guide hole. A primary support structure of the tunnel hole is a double-layer primary support structure. During the excavation of the construction tunnel, the construction tunnel is divided into a plurality of tunnel segments from the back to the front for excavation. During the excavation of any one tunnel segment, the method comprises the steps: 1, performing the excavation of the upper hole body and the primary supporting; 2, performing the excavation of the central hole body and the primary supporting of an outer layer; 3, performing the excavation of the lower hole body and the primary supporting of the outer layer; 4, performing the primary supporting of an inner layer; 5, repeatedly performing the steps 1-4 for many times, and completing the excavation of the tunnel. The method is simple in step, is reasonable in design, is convenient for construction, is good in use effect, employs a three-step method for the excavation of the tunnel hole, employs double primary support structure for the full-section support of the tunnel hole after excavation, and can guarantee the safety of the tunnel structure later.

The invention aims at solving the problems existing in an existing landslide section tunnel reinforcing technology and discloses a landslide section tunnel reinforcing device and a reinforcing construction method. The landslide section tunnel reinforcing device comprises multiple pre-reinforcement piles, crown beams, preliminary bracing steel arch frames and pre-stressed tension devices. The pre-reinforcement piles are arranged at the arch springing positions on two sides of a landslide section tunnel. The crown beams are arranged at the tops of all pre-reinforcement piles on the same side of the landslide section tunnel. The preliminary bracing steel arch frames are arranged on the crown beams on two sides of the landslide section tunnel. One end of each pre-stressed tension device is arranged in a rock body where the landslide section tunnel is located, and the other end of each pre-stressed tension device is connected with the corresponding preliminary bracing steel arch frame. Pre-stressed anchor cables are parallel to the inclination direction of the rock body where the landslide section tunnel is located. The landslide section tunnel reinforcing device is reasonable in structural design, good in mechanical property, good in operability and low in construction cost, and the reinforcing construction method is simple in steps.

The invention relates to a safe and high-efficiency mining method for a metal mine in a mountainous area. The safe and high-efficiency mining method for the metal mine in the mountainous area specifically comprises techniques such as pillarless short-hole shrinkage mining, mine solid waste filling and ore pillar recovery. A pillarless short-hole shrinkage mining method is firstly adopted for mining, and then gobs are filled by using tailings and throwing tailings. After filler gelation, certain strength is obtained, the degree of ground surface subsidence can be relieved, and the frequency and scale of ground surface geological disasters induced by mining influence in the mine in the mountainous area are reduced; the method provided by the invention is low in cost, the mineral resource recovery rate is high and greater economic benefits can be produced; the application scope is wide and the method is suitable for popularization and application.

The invention discloses a construction method of a combined supporting and retaining structure, and relates to the technical field of civil construction. The method includes the steps of surveying and setting-out, mountain slope treatment, manufacturing of prefabricated reinforced concrete breast boards, foundation surface cleaning and replacement filling, construction of a cast-in-place concrete foundation, construction of a cantilever type structure, construction of pre-stressed anchor cables, masonry installation of the prefabricated reinforced concrete breast boards, and construction of a wrapped face reinforced soil structure and a covering layer. By using the vertical pre-stressed anchor cables, the workload can be reduced, the construction period can be shortened, the anti-overturning capacity and anti-slippage capacity of the combined supporting and retaining structure can be improved, and the overall stability and anti-lateral-deformation capacity of the whole combined supporting and retaining structure can be improved; by adopting the prefabricated reinforced concrete breast boards, the construction progress can be accelerated, and the project quality can be ensured; by using the wrapped face reinforced soil structure, the strength and integrity of a filling part can be improved, and the lateral soil pressure on the panel of the supporting and retaining structure can be reduced. By means of the method, the overall stability is improved, occupation of land is reduced, construction is simplified, and the construction cost is reduced; the method is especially suitable for roadbed construction in mountainous and hilly regions.

The invention discloses a method for preparing sensing type plastic geogrids. The method comprises the following steps: step (1) manufacturing a conductive composite material by selecting high density polyethylene as a base material and conductive master-batches to which super conductive carbon black is added as padding; step (2) conducting a tensile test on the conductive composite material indoors, and determining the relationship between the deformation and resistance variation of the conductive composite material; step (3) preparing sensing type grids by utilizing the conductive composite material; and step (4) determining the net type of the sensing type grids, namely adding regular hexagonal additional bars on parallel main bar columns of the sensing type grids. By utilizing the pulling sensitive characteristic of conductive plastic, the deformation information of the geogrids is obtained by testing the resistance of the grids, a sensor does not need to be buried in a soil body, and thus the phenomena that the deformation test precision is reduced due to the implantation of the external sensor and the durability of the sensor cannot meet requirements are avoided.

The invention discloses a Co9S8/MoS2 composite material prepared by a two-step method and application thereof to hydrogen separation reaction. The invention aims at improving the catalysis performanceof a catalyst on hydrogen gas separation reaction and the self stability. Firstly, a quantitative cobalt salt, thiourea and glutathione mixed solution is subjected to hydro-thermal treatment to obtain hollow ball structure Co9S8 precursors; then, the Co9S8 precursors are put into molybdenum salt and L-cysteic acid solution for secondary hydro-thermal treatment; in the process, MoS2 nanometer flower precursors grow at the Co9S8 of the hollow ball structures; finally, through roasting treatment, Co9S8/MoS2 is obtained. The compound has the unique three-dimensional nanometer structure, so that the great specific surface area is realized; more active sites are exposed. More remarkable, an interface structure exists between the Co9S8 and MoS2; the Co-Mo-S bonds favorable for improving the catalysis activity exist, so that the hydrogen separation catalysis activity can be improved. The method has the advantages that the advantages that the operation is simple; no pollution exists in the manufacturing process; the production is easy.

The invention discloses a cable-stayed immersed tube tunnel structure and method, which solves the problem that a large amount of manpower, equipment and financial resources are required for the construction of the immersed tube tunnel structure in the prior art, and has the advantages of being able to effectively adapt to weak riverbeds, seabeds, etc. Geological conditions, beneficial effects of adjustability, the scheme is as follows: a cable-stayed immersed tube structure, including multi-section immersed tubes, and pile foundations perpendicular to the surface of the immersed tubes are fixed on both sides of each section of immersed tubes. The foundation and the immersed tube are connected by a plurality of stay cables, the stay cables are arranged symmetrically on both sides of the pile foundation, and the stay cables are arranged obliquely.

The invention discloses a construction method for advance grouting and supporting for tunnel partial collapse, and relates to the technical field of tunnel construction. Based on back pressure backfilling, sleeper stacks are used for further supporting the part which have the quickest and largest deformation and is the most unstable in the initial supporting, so that the fact that the entire steelarch wholly collapses from the arch part and causes the currently stable steel frame on the left side of the line to damage together is avoided, and the collapse range and intensity are controlled; the grouting reinforcement is carried out to the deformed section surrounding rock, so that the aims that the deformation is controlled and the safe replacement of the deformed limit invasion steel frame is guaranteed are achieved, and better supporting effect is realized; a butterfly arch is used to better conform to the practical situation of the site surrounding rock, so that the supporting forthe unstable surrounding rock at the single side deformation section is strengthened, and the fact that the supporting intensity meets the site requirements is guaranteed; the advance supporting measures are adopted to improve the front surrounding rock integrity and self stabilization capability, and the construction safety is guaranteed; different from the traditional manner of total-ring arch replacement, the cost is low, the adaptability is high and the generalizability is high.

The invention discloses a deep mine hard rock roadway stress adsorption layer structured support method. In the initial stage after a deep roadway is excavated, concrete is sprayed to form a concrete flexible support layer. 4.5 m-5.0 m blastholes are drilled in the two sides of the roadway and an arch top, the spaces in the range of 2 m-2.5 m of the bottoms of the blastholes are filled with explosive for conducting soft fragmentation explosion to construct an arch broken rock stress adsorption layer. Grouting conduit anchor rods are driven in through the blastholes, cement paste is poured into the grouting conduit anchor rods to reconstruct structure support bodies. Paste is poured into the blastholes so as to fix the grouting conduit anchor rods, so that a rockburst prevention support structure formed by the arch broken rock stress adsorption layer, the structure support bodies, an isolation rock body, the concrete flexible support layer and the grouting conduit anchor rods of the high-stress deep hard rock roadway in a cooperative mode is achieved. Through the stress adsorption layer formed by the support technology, high stress and gathering of stress energy of surrounding rock of the isolation rock body can be effectively reduced, rockburst is restrained, and tunneling safety and efficient construction of the deep hard rock rockburst type roadway can be well achieved.

The invention discloses a supporting structure formed on a high-ground-stress weak surrounding rock tunnel by using an ultralong extended head anchor cable, and relates to the field of tunnel construction. The supporting structure comprises a supporting structure body and a primary supporting structure, wherein the supporting structure body comprises a hole formed in surrounding rock, an anchor cable and a grouting body filled in the hole; the anchor cable is divided into an anchoring section, a tensioning section and an outer anchor head; the cross section dimension of the anchor cable head positioned in the anchoring section is greater than other positions of the anchor cable; the anchor cable positioned in the tensioning section generates prestress when being tensioned; and the length of the anchor cable is 35 to 40m. The friction resistance of the surrounding rock on the anchoring section is transmitted to the primary supporting structure through the tensioning section; through theeffect of the prestress, the rock body structure surface is in a tightly pressed state, so that the integrality of the surrounding rock per se is improved; the anti-sliding force of the sliding surface is directly changed so as to maintain the stress balance of the surrounding rock; meanwhile, the cross section of the anchoring section is expanded, so that the expanded head and the rock body extrude to form strong end bearing force; and the pulling-resistant force is greatly improved, so that the goals of stabilizing deep surrounding rock and inhibiting the deformation can be achieved.

The invention relates to a preparation method of an organic electrolyte capable of improving heat stability of a lithium-ion battery. The method comprises the following steps: (1) mixing two or more organic solvents at a room temperature at equal mass ratio after removing impurities, so as to obtain a mixed solvent; (2) lastingly stirring the mixed solvent and adding various lithium salts with different contents to obtain a series of electrolytes without an additive; and (3) adding a flame-retardant additive and other functional additives to the electrolytes without the additive, so as to obtain the lithium-ion battery electrolyte with relatively good heat stability. According to the preparation method, the heat stability of the electrolyte can be improved; the safety performance and the cycle performance of the electrolyte at a high temperature can be improved; prolonging of the cycle lifetime and the storage lifetime of the lithium-ion battery is facilitated; and the method is simple in technique, low in cost, suitable for industrial production, and relatively wide in application prospect.

The invention discloses a construction method for a tunnel passing through a high-angle thrust water-rich and sand-rich fault. The method comprises the steps: 1, performing the preliminary excavationand the supporting construction of a rear tunnel segment; 2, performing the synchronous excavation and the supporting construction of the rear tunnel segment and a water drainage hole body of a waterdrainage hole; 3, performing the synchronous excavation and the supporting construction of the rear tunnel segment, the water drainage hole body of the water drainage hole and a rear detouring headingsegment; 4, performing the excavation and the supporting construction of a front water drainage hole body, a front heating segment and a central tunnel segment; 5, performing the excavation and the supporting construction of a front tunnel segment. According to the invention, the water on the upper wall of the fault is drained through a high-level water drainage hole between a tunnel front hole and a detouring heading pit, and the auxiliary water drainage is performed through the detouring heading pit, and the fault condition in front of the tunnel face of the front hole can be explored in advance, thereby guaranteeing the construction safety of each tunnel face. The method employs the three-step method for the excavation of the tunnel front hole, employs double preliminary supporting structures for the full-section supporting after excavation, can guarantee the safety of the tunnel structure later, and shortens the construction cycle.