16 results about "Damage zone" patented technology

The invention belongs to the technical field of rock wall crane beam construction, and particularly relates to an excavation method for brittle rock body rock wall crane beam forming under the high ground stress condition. According to the excavation method for forming the fragile rock wall crane beam under the high ground stress condition, excavation parameters are provided in real time by establishing a refined finite element model of rock mass near an excavation area, and in an expected range, a primary damage area and a secondary damage area in a protective layer are controlled within the expected range, so that the contour of the rock wall crane beam is drawn, and the rock wall crane beam is formed. The rock wall crane beam is formed, so that the excavation difficulty of the rock wall crane beam is reduced, and the forming quality of the rock wall crane beam is guaranteed.

The present application relates to a kind of potential rock burst pit depth quantitative estimation method considering structural plane and excavation disturbance effect, obtain the initial maximum principal stress and rock uniaxial compressive strength of the region to be estimated, preliminary evaluation whether it has the potential to occur rock burst;Surrounding rock is estimated to estimate the scope of excavation damage zone by sound wave test;According to the sound wave test data, the disturbance factor at different depths is estimated;According to the change characteristics of disturbance factor, the height damage zone and weak damage zone range of surrounding rock in excavation damage zone are estimated;Estimate the potential rock burst pit depth of surrounding rock.The present application not only considers rock strength and stress condition, but also considers the influence of structural plane and excavation disturbance on potential rock burst pit depth, uses high-precision, low-cost and convenient sound wave test technology and a small amount of rock indoor strength test can be realized, with greater innovation, practicality, economy and feasibility.

The invention discloses a rock mass mechanical parameter determination method and system for a rock slope blasting excavation damage area, particularly relates to the technical field of rock mass engineering stability evaluation, and is used for solving the problem of misalignment of parameter characterization caused by neglecting a damage area rock bridge and fracture zone composite structure in the prior art. The method comprises the following steps: arranging a point load test in a damage area and identifying non-unimodal distribution data; combining fracture catalog data, fusing penetrability fracture density segmentation capability and a dominant inclination angle direction failure effect to generate a collaborative isolation parameter, and dividing a residual rock bridge and fracture fracture zone spatial distribution mode according to the collaborative isolation parameter; accurately classifying the intensity data into two types of subsets based on space mapping; and finally, macro-mechanical parameters are generated through weighted fusion of the area proportion and the double-source strength statistical value, the rock mass strength prediction precision of the blasting damage area is remarkably improved, and a reliable basis is provided for slope stability analysis and support design.

The application discloses a test method for studying the connection mechanism of hydraulic fractures and high-angle shear type fractures, and belongs to the technical field of indoor test of rock mass hydraulic fracturing. The test method for studying the connection mechanism of hydraulic fractures and high-angle shear type fractures preforms a through fracture at the side of a sample close to the top, performs high-temperature thermal shock treatment on the inner side of the through fracture, thereby forming a gradient damage zone, and processes a perforation upward in the middle of the bottom surface of the sample; the treated sample is placed in an experimental device, and a plurality of acoustic emission probes are pasted on the surface of the sample; a surrounding pressure and an axial pressure are sequentially applied by using a staged loading mode, then high-pressure water fracturing is continuously carried out in the perforation at a constant rate, and the fracture pressure and the corresponding flow rate are recorded when the sample is broken; the hydraulic fracturing process is analyzed according to the flow-pressure curve obtained by the test and the information collected by the acoustic emission probes, and the connection law of the hydraulic fracturing fractures and the through fractures is obtained by combining the CT three-dimensional reconstruction technology after the test.

The invention discloses a wedge-shaped broaching groove blasting scheme design method, and belongs to the technical field of mining and tunnel blasting. The method comprises the following steps: firstly, determining the radius of a crushing area and the radius of a crack area of the single-hole columnar cartridge bag; setting an initial vertical blast hole position in the cutting roadway; by taking the initial blast hole as a reference, arranging wedge-shaped blast holes by adopting a rotary replication method, so that the crushing areas of the adjacent blast holes are adjacent, the fracture areas are overlapped, and an angle difference is determined; parallel wedge-shaped blast holes are supplemented in an uncovered area of the middle fissure area; finally, a row of blast holes are formed in the center line and the two sides of the roadway respectively, and the damage area covers the designed width of the roadway. The quantitative hole distribution model is established based on the damage partition radius, precise connection is achieved, and the blasting efficiency and the forming quality are improved.

A method for producing a structured glass disk is provided that includes the steps of: providing a glass disk having a thickness of at most 400 μm; directing and focusing a laser beam onto the glass disk such that the laser beam produces an elongated focus within the glass disk with an intensity sufficient to produce damage within the glass disk along the elongated focus; moving the laser beam and the glass disk relative to one another to insert damage zones along a ring-shaped path so that a workpiece is defined in the glass disk with the ring-shaped path encompassing the workpiece and with the workpiece remaining connected to the glass disc; exposing the glass disk to an etchant so that the etchant intrudes into the damage zones; and chemically toughening the glass disk with the workpiece.

A damage assessment module operating on a computer system automatically evaluates a roof, estimating damage to the roof by analyzing a point cloud of a roof. The damage assessment module identifies individual shingles from the point cloud and detects potentially damaged areas on each of the shingles. The damage assessment module then maps the potentially damaged areas of each shingle back to the point cloud to determine which areas of the roof are damaged. Based on the estimation, the damage assessment module generates a report on the roof damage.

This invention provides a method and system for predicting the damage evolution of concrete lining in tunnel fires, relating to the field of computer technology. The method includes: acquiring geometric feature data of the tunnel, fire image data, and high-temperature performance data of the lining concrete; constructing a thermal flow field based on the geometric feature data and fire image data to obtain a three-dimensional transient temperature field; calculating the internal forces of each section based on the three-dimensional transient temperature field and the high-temperature performance data of the material to obtain the real-time internal force state of each section of the lining; determining damage initiation based on the real-time internal force state of each section of the lining to obtain the spatiotemporal distribution of the initial damage zone; performing damage-internal force coupled evolution based on the spatiotemporal distribution of the initial damage zone to obtain the damage evolution path; and generating a safety situation map based on the damage evolution path to obtain a spatiotemporal evolution map of structural risk. This invention significantly improves the accuracy and reliability of predicting the damage evolution process and final safety state of tunnel concrete lining under fire conditions.

The application provides a method and system for measuring the damage depth of a silicon wafer after wire sawing, which comprises: determining the transition zone between the outer surface of the silicon wafer and the damage zone; the upper boundary line and the lower boundary line of the transition zone are parallel to each other, and the upper boundary line and the lower boundary line are determined according to the wire mark direction and the position information of the damage point; constructing a boundary line parallel to the upper boundary line and bisecting the transition zone; constructing a damage termination line parallel to the boundary line through the Nth damage point in the damage zone; and measuring the distance between the boundary line and the damage termination line as the damage depth of the silicon wafer. By defining the transition zone and the standards of the boundary line and the damage termination line, the application improves the boundary ambiguity and data error problems in the damage depth measurement, improves the measurement accuracy and repeatability, reduces the measurement instability caused by accidental errors, and is suitable for a wide range of types.

The invention relates to a method for repairing a part (10) made of a ceramic matrix composite material, the part having a damaged zone, the method comprising: - a step of machining away at least the damaged zone so as to obtain a recessed repair zone (12); - a step of placing, in the recessed repair zone (12), a repair material (13) comprising at least one ply (15) of composite material preimpregnated with a ceramic matrix precursor; - a step of compacting the one or more plies (15) of composite material preimpregnated with the ceramic matrix precursor in order to increase a fiber volume content; and - a sintering step for consolidating a bond between the repair material (13) and the composite part (10).

The application discloses a kind of based on stress balance's surrounding rock plastic damage zone analytical prediction method, belong to tunnel engineering technical field, including the following steps: obtaining initial plastic zone boundary;Based on plastic zone area correction model and lower than plastic stress part elastic stress distribution is invariable, obtain the elastic load summation of surrounding rock stress before adjustment lower than yield stress part and the elastic load summation of elastic zone after stress adjustment is equal when radius tends to infinity, and the elastic load summation of surrounding rock stress before adjustment higher than yield stress part and the summation of load of plastic zone after stress adjustment is equal;Based on stress balance principle, obtain the radius of surrounding rock plastic zone;Based on the radius of surrounding rock plastic zone and polar coordinate plotting, obtain the range and form distribution characteristics of tunnel surrounding rock plastic zone;The application solves the problem of insufficient accuracy of tunnel engineering surrounding rock plastic zone solution in stress prominent area.

This invention provides a method and system for refined characterization of blasting damage zones and calculation of surrounding rock loads. The method includes: acquiring working parameters related to tunnel blasting excavation; constructing a numerical model based on these parameters; solving the numerical model to obtain the strain increment of the tunnel surrounding rock under blasting loads; inputting the strain increment into a strain rate-related dual-scalar tensile-compressive damage constitutive model to obtain tensile damage factors and compressive-shear damage factors; establishing damage evolution laws related to strain rate for the tensile strain tensor and compressive-shear strain tensor respectively in the dual-scalar tensile-compressive damage constitutive model, independently characterizing the tensile damage mechanism and the compressive-shear damage mechanism; evaluating the damage zoning of the tunnel surrounding rock based on the tensile damage factors and compressive-shear damage factors to obtain tensile damage zones, compressive-shear damage zones, and refined zoning; and determining the surrounding rock load based on the tensile damage zones and compressive-shear damage zones. This invention achieves refined characterization of blasting damage, thereby enabling accurate determination of the surrounding rock load.

A damage assessment module operating on a computer system automatically evaluates a property, estimating damage to the property by analyzing a point cloud of a property. The damage assessment module identifies individual point clusters or segments from the point cloud and detects potentially damaged areas of the property surface by identifying outlier points in the point clusters. The damage assessment module may be used to determine the financial cost of the damage and / or determine whether the property should be replaced or repaired. In addition to eliminating the need for an estimator to visit the property in person, the damage assessment module improves the consistency and accuracy associated with estimating damage to a property.

This invention discloses a simulation platform and a dynamic evaluation method for support effects in composite roof roadways, specifically relating to the field of digital simulation technology. It addresses the problem of delayed support effect evaluation caused by insufficient fusion of multi-source monitoring data in existing digital twin systems. By acquiring multi-source monitoring data on microseismic, stress, and deformation, the invention identifies key bearing layers in the composite roof, delineates potential damage zones within these layers, and determines the effective anchorage range based on support parameters. It analyzes the spatial competition between these two layers, predefines multiple typical support failure modes based on this relationship and the rock structure, and constructs a damage evolution trajectory for each mode that reflects the collaborative evolution law of multi-source data. Real-time monitoring data is dynamically matched with each trajectory to determine the target support failure mode and its evolution stage corresponding to the current damage state. Based on this, the control effect of the current support scheme is evaluated, and dynamic early warning information is generated, achieving a mechanistic and forward-looking dynamic evaluation of support effects.

This invention discloses an abrasive waterjet rock-breaking method with a secondary impact effect and composite abrasive particles. The composite abrasive consists of a core, an intermediate layer, and an outer shell. The method uses a nozzle to accelerate the jet and impact the rock. First, the composite abrasive particles as a whole undergo an initial impact, forming a damaged zone. Subsequently, the impact load causes the outer shell and intermediate layers of the particles to fracture as designed, releasing the core particles. The core particles, driven by the high-speed water flow, precisely impact the aforementioned damaged zone a second time. The intermediate layer has a lower body strength than the outer shell and core, and its interfacial bonding strength with adjacent layers is precisely designed to ensure stability during transport, while reliably failing during the first impact to release the core. This invention achieves sequential energy utilization through a synergistic "impact-release" mechanism, significantly improving the rock-breaking efficiency of hard rock and the utilization rate of abrasive kinetic energy.

The invention relates to the technical field of optical fiber processing, in particular to an optical fiber coating layer stripping opening forming method which comprises the following steps: S1, laser chain scission of a coating layer: irradiating a passivation layer through laser in the circumferential direction of an optical fiber so as to break a main chain chemical bond of the passivation layer at the irradiation position, and forming an annular damage belt; s2, mechanical scraping thinning of the coating layer: scraping the coating layer at the annular damage belt through mechanical cutting until the coating layer is away from the surface of the cladding by a preset distance; s3, laser finishing of the coating layer: breaking a main chain chemical bond of the residual coating layer on the surface of the cladding at the annular damage belt through laser; s4, stripping the coating layer and cleaning the residual coating layer: stripping the coating layer on one side of the annular damage belt from the cladding layer, and reserving the coating layer on the other side of the annular damage belt; and then cleaning the residual coating layer at the annular destroying belt to obtain the stripping opening. According to the method disclosed by the invention, a molecular-level flat stripping opening can be obtained.