4719 results about "Rock bolt" patented technology

The present invention discloses an anti-corrosion and anti-seepage anchor structure for new buildings, which includes multiple steel strands arranged in an anchor hole. The top of the anchor hole includes a cushion layer, a bottom plate and a surface layer from bottom to top; a tension end anchor assembly is arranged at the top ends of the multiple steel strands and is located in the bottom plate below the surface layer. The tension end anchor assembly includes a settlement type winged anchor backing plate, which is arranged at the top of the multiple steel strands and is located at the top surface of the bottom plate. The settlement type winged anchor backing plate has a cylindrical structure, and the cylindrical structure includes a cylinder head part, a cylinder body part and a cylinder tail part from top to bottom. Among them, the tension anchor of the tension end anchor assembly is arranged at the cylinder head part; a connecting pipe is sleeved outside the multiple steel strands, and the upper end of the connecting pipe is hermetically connected to the lower end of the cylinder tail part; a water-stop steel ring assembly is embedded in the bottom plate and the cushion layer at the same time, and the lower end of the connecting pipe extends into the water-stop steel ring assembly; a front anchor carrier assembly is arranged at the other ends of the multiple steel strands. It can solve the problem of upward seepage of underground foundation water.

The invention relates to the field of tunnel engineering geology and support design, and discloses a weak surrounding rock tunnel deformation risk discrimination method based on shear expansion-shear constitutive, which comprises the following steps: constructing a nonlinear coupling model between a shear expansion angle and shear stress, normal stress and joint parameters, and obtaining the shear expansion angle; establishing a volumetric strain rate discrimination formula; inverting an initial crustal stress tensor field; reconstructing an irregular tunnel boundary; constructing a risk level discrimination model, and outputting a risk level; supporting schemes such as supporting rigidity, anchor rod parameters and spraying layer thickness are matched according to the risk grades; establishing a model to predict a risk trend; a support adjustment suggestion is generated; collecting monitoring data to dynamically correct model parameters; and all the modules are integrated in a deployment system. According to the method, the coupling relation between the shear expansion angle and the shear strength is introduced, the coupling type constitutive discrimination model is established, the risk grading system and the support correction strategy associated with the support response are constructed, and active early warning of the high-risk section and dynamic adjustment of the support rigidity are achieved.

The present invention belongs to the technical field of anchor protection apparatuses. Provided is an automatic anchor protection platform having combined support of anchor rods and anchor cables. The automatic anchor protection platform comprises a movable chassis, a multi-cycle anchor rod drilling rig, an anchor rod drilling rig posture positioning control device, an anchor cable support device, a temporary support device, an electrical system and a hydraulic system. Said automatic anchor protection platform integrates the multi-circle anchor rod drilling rig, the anchor cable support device and the temporary support device, and therefore meets the anchoring and support requirements of roadways under different geological conditions, allows anchor rod and anchor cable parallel support operations to be conducted at the same time, and achieves efficient coordinating matching linkage integrated design, thus further promoting efficient operation processes in limited spaces such as coal mines and tunnels.

The invention belongs to the technical field of supporting structure performance evaluation, and particularly discloses and provides an NT-CEP pile wall anchor foundation pit supporting structure anti-overturning evaluation method which comprises the steps that in the whole construction period, the construction process is divided into a plurality of continuous load steps based on excavation and supporting procedures; under each load step, pile body strain, arc-shaped wall stress, anchor rod axial force and deep soil displacement are synchronously collected, and a multi-source response data set is constructed; constructing an NT-CEP pile-arc wall-anchor rod coupling model based on the design drawing; carrying out inversion analysis through the model, and solving the load sharing proportion and the overall anti-overturning safety coefficient of each component under each load step; and continuously identifying the abnormal component based on the load sharing proportion, and dynamically analyzing and outputting an anti-overturning capability evaluation index based on the change trend of the safety coefficient. According to the method, dynamic refined evaluation of the construction process is realized, and the authenticity and perspectiveness of an evaluation result are remarkably improved.

The invention discloses a drill rod for construction of an integrated stirring forming type cemented soil stiff anchor rod, the drill rod comprises a drill bit part and a hollow drill rod, the drill bit part comprises a shell, an anchor disc fixed in the shell and a spiral blade welded on the shell, and the hollow drill rod is inserted into the shell; the sheath steel pipe is inserted into the hollow drill rod and fixed to the shell, the grouting pipe is inserted into the sheath steel pipe, one end of the rod body is fixed to the anchor disc, and the other end of the rod body extends out of the sheath steel pipe. A first grouting hole is formed in the shell, and a second grouting hole is formed in the sheath steel pipe. The invention further discloses a construction method of the integrated stirring forming type cemented soil stiff anchor rod. When the method is used, the processes of hole forming, anchoring, grouting and the like are integrally formed, the process is simple, the speed is high, and the quality is easy to control; the formed cement-soil pile body is uniform in internal structure and reliable in strength; tension of the anchor rod is uniformly distributed, so that stress concentration can be reduced; and the formed cement soil pile body is high in end strength and good in safety.

A bilateral expanding excavation construction method for a middle pilot tunnel of a tunnel is provided. Section or excavation width of the middle pilot tunnel is generally not larger than that of a common double-line or double-lane tunnel; a step construction method is adopted, and the construction method is the same as that of a common double-line or double-lane tunnel; and the construction method is familiar to constructors, and the construction difficulty is avoided. A primary support section of the middle pilot tunnel can be expanded and excavated after being closed by at least 3 meters; if a side tunnel face is stable, and the problem of the operation height of manual installation of a steel frame and an anchor rod is solved, one-time excavation and support can be achieved, and the construction is more convenient; or otherwise, a side tunnel is excavated according to a two-step or three-step method. The primary support of the middle pilot tunnel can be timely closed; the primary support of the side tunnel and the primary support of the middle pilot tunnel can be completely connected in sequence, and various errors and deformation influences of surrounding rocks and the supportare left at an inverted arch part for treatment; and the construction progress is basically the same as that of the common double-line or double-lane tunnel.

The invention belongs to the technical field of underground engineering, and discloses an omnibearing intelligent monitoring system, method and device for an underground anchoring pull-out test. According to the method, electromagnetic signals generated in the stress process of the anchor rod are captured in real time through an electromagnetic sensor, and internal stress changes and energy distribution are reflected; the deformation and stress states of the anchor rod in the dynamic environment are evaluated through a strain gauge and accelerometer combined data combination method, the deformation condition of the anchor rod is monitored through the strain gauge, and the stress-strain relation is recorded; an accelerometer is used for detecting the dynamic response of surrounding rock mass so as to evaluate the overall stability of the rock mass; a coupling medium is injected, the computer terminal stores the collected signals locally or in a cloud end and analyzes the signals, stress and deformation parameters in an anchor rod pull-out test are extracted, and an anchor rod stress cloud picture is generated in real time. According to the method, the safety and reliability of underground engineering are remarkably improved, and a new technical support is provided for evaluation of anchoring quality.

The invention provides a deep-buried soft rock tunnel supporting structure design method based on energy regulation and control, and belongs to the technical field of tunnel engineering. Comprising the following steps: obtaining components of crustal stress in a large principal stress direction, a middle principal stress direction and a small principal stress direction; manufacturing a rock cylinder test piece and a cube test piece; carrying out a conventional uniaxial compression test on the cylindrical test piece to obtain basic strength parameters of the surrounding rock; carrying out a true triaxial loading and unloading test on the cubic test piece to obtain the ultimate dissipated energy of the surrounding rock; drawing up a tunnel anchor rod supporting structure design scheme; establishing a deep-buried soft rock tunnel calculation model considering the synergistic effect of the surrounding rock and the anchor rod, and calculating the dissipated energy density of the surrounding rock and the absorbed energy of the supporting structure; the instability energy judgment basis of the surrounding rock and the instability energy judgment basis of the anchor rod are calculated; and judging the stability of the surrounding rock and the stability of the anchor rod. The method is suitable for the tunnel in a deep high-energy geological environment, and can reflect the energy driving essence of the instability failure of the high-ground-stress deeply-buried soft rock tunnel.

The invention discloses a yielding grouting anchor rod for a high-ground-pressure soft breakable roadway, and belongs to the technical field of roadway supporting, the yielding grouting anchor rod comprises an anchor rod body, the outer surface of the anchor rod body is sleeved with a yielding cylinder, a yielding plate and a rubber plug, the rubber plug is located on one side of the yielding cylinder, the outer surface of the yielding plate is attached to the inner surface of the yielding cylinder, and the outer surface of the yielding plate is attached to the inner surface of the yielding cylinder. A spring and evenly-arranged connecting rods are arranged on the outer wall of one side of the yielding plate, the connecting rods are located between the anchor rod and the spring, one end of each connecting rod penetrates through the inner wall of one side of the yielding cylinder to be connected with one end of a rubber plug, a sleeve is embedded in the outer surface of the rubber plug, and the outer wall of one side of the sleeve is connected with the outer wall of one side of the yielding cylinder. The pressure plate pushes the compression spring to deform, tensile fracture of the anchor rod body caused by overlarge pressure is avoided, the connecting rod is driven to push the rubber plug in the process of pushing the compression spring to deform, the dual pressure yielding and releasing function is achieved, and the anchor rod can adapt to roadway surrounding rock deformation in the high ground pressure environment to a certain extent.

The invention relates to the technical field of construction optimization, in particular to a deep underground engineering construction optimization method and system based on an intelligent support system. According to the technical scheme, stress field, seepage field and deformation field data of surrounding rock are collected in real time; constructing a digital twinborn model, and dynamically updating model parameters; adopting a multi-objective genetic algorithm to optimize support parameters; and executing adaptive control. According to the method, the stress field, seepage field and deformation field data of the surrounding rock are collected in real time through the multi-physics field sensing network, the state change of the surrounding rock can be timely and accurately monitored, meanwhile, the model parameters are dynamically updated so that the model can more accurately reflect the actual situation of the surrounding rock, and the real-time performance of the surrounding rock is improved. And through jet control and anchor rod compensation in self-adaptive control, support parameters can be adjusted in real time according to the actual condition of the surrounding rock, the reliability of a support structure is improved, the stability of the surrounding rock is enhanced, and the safety risk in the construction process is reduced, so that the construction safety is improved.

The invention discloses a multifunctional all-in-one unit which comprises a rack, a tunneling part, a vertical arch part, an arch spraying part and a rock drilling part. A slag discharging channel is formed in the lower portion or at least one side of the rack. The tunneling part is arranged at the front end of the rack and used for tunneling excavation. The arching part is arranged on at least one side of the rack in a sliding mode and used for being matched with the arching part to conduct arching operation, the arching part and the rock drilling part are arranged on the rack in a sliding mode, the arching part is used for guniting operation and being matched with the arching part to conduct arching operation, and the rock drilling part is used for drilling operation; according to the scheme, the integrated trolley is integrated with multiple functions of excavation, erection, bolt anchoring, guniting, pumping and the like, a slagging-off machine and a slag car are arranged for deslagging, full-process construction of the tunnel face is completed, parallel processes or seamless connection of the processes is achieved, the traditional technological method that all the processes are independent and not parallel and work in a multi-machine cooperation mode is changed, the construction progress is greatly accelerated, and the construction efficiency is improved. And more values are created for customers.

The invention discloses a farm wall reinforcing device. Farm wall reinforcing equipment comprises an adjusting sliding frame, an even number of reinforcing devices are installed on the adjusting sliding frame, protective cover baffles are installed on the surfaces of the reinforcing devices, pouring mold clamping plates are arranged in the reinforcing devices, inner grooves are formed in the upper portions of the pouring mold clamping plates, and an even number of steel bar fixing frames are arranged between the inner grooves. A turnover sealing cover which is movably hinged is installed on the inner groove, a fixing steel bar is installed in the steel bar fixing frame, and an on-plate clamping groove is formed in the surface of the pouring mold clamping plate. The adjusting sliding frame is installed at the position of the root of a wall needing to be reinforced, then the reinforcing devices are installed on the adjusting sliding frame in a back-to-back mode, the reinforcing devices clamp the wall in a butt mode, then the threaded anchor rods are sequentially inserted into the pouring mold clamping plates in a matched mode to form opposite pulling, and the threaded anchor rods are clamped and fastened; and finally, after a wall inserting fixing rod, a wall body connecting clamp and a fixing steel bar are inserted, concrete is poured into a guiding and conveying groove, the concrete and the wall body are combined and solidified, and the reinforcing work of the wall body is completed.

The invention relates to the field of geotechnical engineering, and discloses a self-stress anchor rod failure evolution simulation method for jointed rock mass bolting-grouting reinforcement, which comprises the following steps: S1, constructing a three-dimensional rock mass model containing a joint structure in an FLAC3D platform, and defining joint surface space distribution and geometric parameters; s2, a bolting-grouting structure is introduced into the three-dimensional rock mass model, an anchor rod, a grouting body and the contact relation between the anchor rod and the grouting body and the rock mass are set, and an anchor rod load transfer model is established; s3, a loading path is set, displacement control is adopted as a loading mode, and a certain included angle is formed between the loading direction and the joint surface; and S4, establishing a numerical model in FLAC3D, performing grid division, and setting a rock mass material constitutive model and contact surface parameters. By accurately controlling the loading direction and the loading angle in simulation and analyzing the change influence of different loading paths on the failure mode of the bolting-grouting structure, the problem that the traditional simulation method neglects the change of the failure mode under different loading conditions is solved.

The invention discloses a pressure relief and shock absorption method for a deep high-stress key pillar. (a) a top plate is arranged at the top of the ore pillar, four inclined kerfs are alternately arranged in a top plate area around the ore pillar, and the kerfs are symmetrically arranged in a cross shape; (b) eight anchor rod drill holes perpendicular to the top plate are formed in the interval area between the adjacent kerfs and the periphery of the ore pillar, perpendicular anchor rods are arranged in the anchor rod drill holes, and an orthogonal supporting network formed by the perpendicular anchor rods is formed; and (c) preferentially releasing the bending energy of the roof through the kerf, reducing the vertical load of the ore pillar, and meanwhile, forming a pressure arch effect by applying the prestress of the vertical anchor rod, thereby realizing space-time coupling support of the kerf and the anchor rod, and inhibiting roof separation and dynamic disturbance. The invention has the characteristics of excellent stress transfer, strong vibration suppression and excellent overall column stability.

The invention discloses a surrounding rock deformation treatment method which comprises the following steps: determining the range of a strong influence area in a fault through advanced geological detection, and adopting a graded support strategy for different influence areas: when the width of the strong influence area in the fault is three times greater than the span of a tunnel, arranging an NPR anchor cable group on the ground surface to form a pre-reinforcement system; during benching, NPR anchor rods and steel arches are combined for supporting in a fault non-weak-influence area, and long and short NPR anchor cables are additionally arranged in a fault weak-medium-influence area for collaborative supporting; double-gradient grouting is implemented in front of the boundary of the moderately strong affected zone, a peripheral reinforcing shell is formed by grouting at the first gradient of 2-3 MPa, and an internal permeation network is formed by grouting at the second gradient of 3.5-4.5 MPa; through real-time monitoring of the axial force of the steel arch, a linkage response mechanism of anchor cable secondary tensioning and grouting and supplementing is established. According to the method, through combination of advanced pre-reinforcement, graded support and dynamic regulation, active control over tunnel surrounding rock deformation of the fault fracture zone is achieved, and the collapse risk and the support structure damage risk are effectively restrained.

The invention relates to a strong mining roadway thick-layer transboundary supporting method, and belongs to the technical field of roadway supporting, and the method comprises the steps that geometric parameters, rock mass mechanical parameters and stress field parameters of a strong mining roadway are obtained; based on the geometric parameters, the rock mass mechanical parameters and the stress field parameters, the deformation process and the damage process of the strong mining roadway surrounding rock are simulated, and the incidence relation between each deformation stage of the strong mining roadway surrounding rock and the roof partition damage characteristic is obtained; determining a key stage of irreversible deformation of the strong mining roadway surrounding rock based on the association relationship; determining the critical time of transboundary anchoring of the thick layer based on the key stage; determining the support parameters of the anchor rod and the critical anchoring length of the thick layer transboundary; and supporting the top plate of the strong mining roadway based on the critical time, the supporting parameters and the thick-layer transboundary anchoring length. The method has the effect of improving the stability of the strong mining roadway surrounding rock.

The invention provides a deep tunnel energy evolution calculation method considering the synergistic effect of surrounding rocks and anchor rods, and belongs to the technical field of tunnel engineering. Comprising the steps that a deep tunnel calculation model considering the synergistic effect of surrounding rock and anchor rods is established, and tunnel model basic parameters, surrounding rock strength parameters and anchor rod material parameters are input; based on the deep tunnel calculation model, solving a stress evolution path of the surrounding rock of the deep tunnel under the synergistic effect of the surrounding rock and the anchor rod after tunnel excavation; solving a stress evolution path of the deep tunnel anchor rod under the synergistic effect of the surrounding rock and the anchor rod after tunnel excavation; calculating the energy density and total energy of the surrounding rock according to the stress evolution path of the surrounding rock; and calculating the energy density and total absorption energy of the anchor rod according to the stress evolution path of the anchor rod. According to the deep tunnel energy evolution calculation method provided by the invention, the problem of solving the strain softening surrounding rock energy field under the elastic-plastic unloading condition is solved.

The invention relates to the technical field of tunnel construction, and discloses a rapid construction method and system for a lower step with an inverted arch of a horizontal rock stratum large-section tunnel, and the method comprises the steps: constructing a three-dimensional geological modeling system to carry out advanced geological forecast on a tunnel construction region; the three-arm drill jumbo is used for conducting self-positioning, geological self-adaptive intelligent hole arrangement, dynamic optimization of drilling parameters and dynamic allocation of drilling tasks through three-arm cooperative control; calculating the vector deviation between the actual excavation contour and the design contour; marking a preferential injection area based on a three-dimensional laser point cloud technology, and dynamically adjusting an injection track and thickness according to back break data; a multifunctional drilling and grouting integrated trolley is adopted for implementing pipe shed supporting, advanced small guide pipe reinforcement, pre-grouting reinforcement and anchor rod reinforcement; the main mechanical arm assists the trolley in drilling and laser scanning acceptance inspection of the feet-lock bolt; re-spraying to the designed thickness by adopting a wet spraying manipulator; the problems that an existing tunnel lower step inverted arch construction method is low in construction efficiency and large in construction risk are solved.

The invention discloses an anchor rod type mine laneway surrounding rock stress monitoring system, which comprises a hollow anchor rod, a high-precision strain rosette, a strain collector, a gateway, fault prediction and health management software and a server, and is characterized in that the rod body of the hollow anchor rod is of a hollow structure, the high-precision strain rosette is fixed in the hollow rod body, and the strain collector is fixed in the hollow rod body; the strain collector communicates with the gateway through an RS485 bus, the gateway communicates with the fault prediction and health management software and the server in an optical fiber mode, a hollow anchor rod supporting product which is most commonly used at present is utilized in the scheme, the high-precision resistance type strain gauge is arranged in the hollow anchor rod supporting product, the installation form is consistent with that of an anchor rod, and the high-precision resistance type strain gauge can penetrate into a rock stratum; the distributed roadway surrounding rock stress monitoring system is formed, the mine roadway surrounding rock stress change condition can be accurately and comprehensively monitored and pre-warned in real time, different pre-warning signals are sent out in advance, maintenance workers are supervised and urged to take reinforcement measures or evacuate in time, and therefore collapse accidents are avoided.

The invention discloses a soft rock geological cavern tunneling construction method, belongs to the technical field of underground engineering tunnel construction, and aims to solve the safety risk problem caused by high surrounding rock deformation rate, insufficient supporting structure stability and dynamic adjustment lag in the tunnel construction process under the soft rock geological condition. According to the method, an upper pilot tunnel area, a middle pilot tunnel area and a lower pilot tunnel area are divided in the axial direction of a tunnel and excavated step by step, multiple layers of steel arches are sequentially installed, prestressed anchor rods are constructed, a real-time stress monitoring and early warning system is combined, the supporting force of adjustable hydraulic supporting rods is dynamically adjusted, and the deformation rate and the stress level of surrounding rock are controlled. According to the technical scheme, the method is characterized by comprising partition and layering excavation, steel arch and anchor rod collaborative supporting, stress monitoring point arrangement and a dynamic compensation mechanism. The method is mainly used for safe and efficient tunneling of the soft rock geological tunnel, the surrounding rock stability and the construction safety are remarkably improved through refined construction control and real-time feedback adjustment, and the method is suitable for tunnel engineering construction under the complex geological condition.

The invention provides a hydraulic fracturing fracture net distribution form near-field monitoring method, which comprises the following steps of: arranging a plurality of roof monitoring holes in roadways on two sides of an underground coal mine working surface, installing electromagnetic signal sensors in each roof monitoring hole and on anchor rods of roadway stoping sides, and constructing a full-space monitoring network covering a hydraulic fracturing layer; a data interpretation processing module of the electromagnetic signal time-shifting imaging analysis system comprises a multi-field coupling mathematical model for analyzing and deducing real-time imaging of electromagnetic signals; in the hydraulic fracturing process, an electromagnetic signal sensor is used for monitoring a current field, an electromagnetic field and an ion diffusion field in the rock mass fracture development and expansion process, a monitoring result is substituted into an electromagnetic signal time-shifting imaging analysis system for calculation and feature value extraction, and the fracture net distribution form is deduced through the feature value. According to the invention, the expansion path of the fracturing fluid in the rock stratum can be monitored in real time, the three-dimensional distribution form of the hydraulic fracturing fracture network can be inverted, and a new technical support is provided for the inspection of the hydraulic fracturing pressure relief effect of the underground coal mine.

The invention discloses a self-adaptive pre-pressure-relief danger relieving device for a deep mine. The self-adaptive pre-pressure-relief danger relieving device comprises a supporting assembly. The supporting assembly comprises two side supporting plates which are symmetrically arranged, a top supporting plate is installed on the tops of the side supporting plates through connecting plates, and a plurality of pressure relief buffering assemblies which are arranged at equal intervals are installed on the outer walls of the side supporting plates and the outer wall of the top supporting plate. A pressure relief channel is established through the drilling assembly, continuous and directional hydraulic pressure relief is achieved in combination with the jet flow pressure relief assembly, rock mass fractures are effectively expanded, in addition, high-energy shock waves can be rapidly released through the blasting pressure relief assembly, strong pressure relief is achieved, and the device is suitable for a high-stress area; the jet flow pressure relief assembly and the blasting pressure relief assembly are switched in the hollow anchor rod, and an external water supply system and a blasting control system are connected, so that a mine has high adaptive capacity and safety performance according to different pressure relief requirements.

The invention provides high-pressure grouting and water plugging equipment for tunnel boring, and relates to the technical field of grouting and water plugging. Comprising a hollow anchor rod body, one end of the hollow anchor rod body is fixedly provided with a steel expansion-shell anchor head, the other end of the hollow anchor rod body is rotationally sleeved with a stop-grouting plug, the outer surface of the stop-grouting plug is fixedly provided with a base plate, and the side, away from the steel expansion-shell anchor head, of the base plate is provided with a nut which is in threaded connection with the outer surface of the hollow anchor rod body; a partition assembly is arranged outside the hollow anchor rod body and comprises a supporting rod and an annular baffle. Rock mass fractures existing in the grouting and water plugging operation process are plugged through the arrangement of the supporting rods and the annular baffles, the annular baffles can limit the diffusion range of grout, the grouting pressure is made to act on the interior of a drill hole more intensively, meanwhile, the annular baffles can prevent the grout from losing towards the area where grouting is not needed, and the grouting efficiency is improved. It is ensured that more grout enters the target drill hole, so that the utilization rate of the grout is increased, and waste of the grout is reduced.

The present invention relates to the technical field of underground coal mine excavation supporting devices, and in particular to a single-arm wheeled bolt and anchor cable drilling jumbo for a coal mine. The drilling jumbo comprises a wheeled chassis, a multi-degree-of-freedom working arm, and an airborne automatic drilling rig; the wheeled chassis carries the whole drilling jumbo; a main structure is divided into a front frame and a rear frame; one end of the multi-degree-of-freedom working arm is fixedly connected to the tail of the rear frame, and the other end of the multi-degree-of-freedom working arm is connected to the airborne automatic drilling rig and has a plurality of motion degrees of freedom relative to the rear frame; the plurality of motion degrees of freedom constitute two-stage fine tuning acting on the airborne automatic drilling rig; the first-stage fine tuning positioning is achieved by lifting / lowering, left and right swinging, extension and retraction, and rotation of the working arm; the second-stage fine tuning positioning is achieved by left and right swinging, forward and backward folding, and vertical lifting / lowering of a leveling swing mechanism; large-range adjustment of the airborne automatic drilling rig is achieved by means of cooperation of the plurality of motion degrees of freedom, and the requirements of full-section roof, side, and floor bolting are met; and the present invention replaces a traditional mode in which a hand-held pneumatic bolt drilling rig and an existing bolt and anchor cable drilling jumbo are manually operated to perform supplemental bolt and anchor cable installation.

The invention discloses an open-type TBM over-slowly-inclined soft rock stratum zoning and sectioning collaborative supporting construction method. The method comprises the steps that S1, shield tail immediate supporting is conducted; s2, reinforcing and supporting the rear part of the supporting shoe; and S3, bottom arch anchor support closing regulation and control. According to the open-type TBM equipment structure characteristics and the slowly-inclined soft rock stratum deformation rule, a supporting area is divided into three operation sections including a near-shield-tail instant supporting area, a supporting shoe rear reinforcing supporting area and a bottom arch anchor supporting closed regulation and control area, differential supporting is implemented in a staged mode, space-time progressive construction of pre-stressed anchor cables and anchor rods is combined, and the supporting effect is greatly improved. Matching of supporting rigidity and stratum deformation is ensured through dynamic adjustment of prestress, a dynamic collaborative supporting system of instant supporting, reinforcement and closed-loop regulation and control is formed, and double improvement of supporting efficiency and safety is achieved.

The invention relates to the technical field of slope reinforcement, and discloses an anchoring device for preventing landslide geological disasters, the anchoring device is arranged on a slope surface, distributed in a grid shape and formed by splicing a plurality of anchoring units, each anchoring unit comprises an anchor rod support and four frames, the four frames are evenly distributed on the periphery of the anchor rod support, and the anchor rod support is arranged on the periphery of the anchor rod support. The anchor rod support is detachably connected with the frame; a center hole is formed in the anchor rod support, and an anchor rod inserted into a slope body is installed at the center hole. Every two adjacent frames are connected through a set of reinforcing mechanisms. The modular structural design is adopted, specifically, the detachable anchor rod supports and the frame are combined, the weight of a single node is small, carrying is convenient, manual carrying and rapid splicing are facilitated, a latticed splicing system formed by the scheme can adapt to terrains with different slopes, and the construction efficiency can be effectively improved.

The invention relates to the technical field of anchoring structure design, in particular to a method for determining the critical anchoring length of an anchor rod based on numerical simulation. Firstly, the critical anchoring length is determined, a short anchor rod pull-out test is conducted on site, a pull-out force and displacement curve of the anchor rod is obtained through the field test, the pull-out displacement curve is converted into the relation between shear stress and shear displacement through a formula, then numerical simulation is conducted, FLAC3D is selected for numerical simulation of the pull-out test, and the tensile strength of the anchor rod is improved. By increasing the nodes of the pile structure units and continuously increasing the drawing length of the anchor rod, a large number of tests do not need to be carried out on site, the influence of site environment and human factors on the determination of the anchoring length of the anchor rod does not need to be considered, manpower and material resources are saved, and the mechanical property of site surrounding rock is not destructed; and engineering can be well adapted.

The invention relates to a method for optimizing a newly-built anchor rod supporting system for slope expanding excavation by using residual anchor rods. The method comprises the following steps: preliminarily selecting a plurality of excavation schemes of different excavation slope angles according to the geometrical morphology of the side slope and the layout of anchor rods; calculating the excavation area and the residual length of the anchor rod of each scheme; calculating the theoretical ultimate uplift bearing capacity of the residual anchor rod based on the soil nail theory; midas GTS NX software is used for establishing a slope stability numerical simulation model considering and not considering the influence of residual anchor rod reinforcement, and a safety coefficient and anchor rod axial force distribution are calculated; by comparing the maximum axial force of the residual anchor rod obtained through numerical simulation calculation with the ultimate uplift bearing capacity obtained through theoretical calculation, the authenticity of the numerical simulation calculation safety coefficient is judged, and the true safety coefficient is sought; calculating a rock-soil body shear strength parameter adjustment coefficient according to the true safety coefficient to obtain an enhanced rock-soil body shear strength parameter, inputting the enhanced rock-soil body shear strength parameter into geotechnical engineering design software, and designing a newly-built support structure; and finally, technical and economic comparison and selection are carried out on the schemes, and the optimal scheme is selected.

The invention particularly discloses a time-space design method for a railway tunnel active support rock anchoring and shotcreting synergistic effect considering a time-space effect, and relates to the technical field of civil engineering. The method comprises the steps that firstly, expression characteristics of the load time effect, the material time effect, the tunnel face space effect and the rock anchor bearing arch space effect of active supporting are determined, a space-time effect characterization method is established, and then a tunnel active supporting rock anchor and shotcrete synergistic effect space-time calculation model is constructed; then determining calculation parameters of a rock anchor bearing arch and a sprayed concrete layer, and constructing a surrounding rock pressure calculation method and a safety evaluation method considering the advance support effect; and finally, according to a calculation result of the tunnel active support rock anchoring and shotcreting synergistic effect space-time calculation model, safety is judged, and design parameters of a pre-stressed anchor rod and shotcreting concrete are determined. The method can simply, quickly and accurately calculate the internal force distribution and safety of the tunnel rock anchor bearing arch and the sprayed concrete layer under different time, geological conditions and support design parameters, and has good engineering value.

The invention provides a high and steep slope reinforcing system with a slope crest adjacent to a post-built municipal pipe gallery and a construction method of the high and steep slope reinforcing system. The reinforcing system comprises an original side slope lattice anchor supporting structure, a pipe gallery structure, a foam concrete backfill structure located on the side, close to the original side slope surface, of the pipe gallery structure, a row of newly-added anchor rods / cables constructed below the first row of original anchor rods / cables below the slope top, and a row of miniature steel pipe piles constructed below the outer side, close to the side slope surface, of the pipe gallery structure. A first row of anchor rods (cables) of an original removed side slope support are replaced by newly added anchor rods or anchor cables, and the whole steel pipe piles are located in the foam concrete to form a miniature pile retaining wall structure. The overall stability of the high and steep slope with the slope crest adjacent to the pipe gallery is greatly improved, and displacement of the slope crest adjacent to the pipe gallery is effectively controlled; the settlement of the slope crest adjacent to the pipe gallery is effectively controlled in a design and standard range; meanwhile, the foam concrete structure is used for filling the pipe ditch (groove), so that filling pressure can be reduced, and compactness and strength are guaranteed.