37 results about "Slope ratio" patented technology

The invention discloses a deep foundation bearing capacity characteristic value calculation method and system based on data fusion. The method comprises the steps that data collection is completed through a deep load test, and a load settlement curve and a settlement time logarithmic curve are formed; generating a smooth curve; identifying a slope mutation point of the curve by adopting a first-order derivative mutation method, wherein a load corresponding to the mutation point is a proportional limit load; if the slope abrupt change point is not recognized, the curve is set as a slowly changing curve; extracting the slope and the slope change rate of the curve under each level of load, and completing the judgment and correction of the limit load by fusing the multi-dimensional data of the two curves and combining preset thresholds including the settlement amount and the settlement stabilization time; and further calculating the bearing capacity characteristic value of the deep foundation by combining the numerical relationship between the ultimate load and the proportional limit load.

The utility model discloses a device for measuring the slope ratio and angle of a side slope, a sliding marking plate is clamped in an L-shaped support main body in a sliding manner, the end part of the sliding marking plate is fixedly connected with a mounting arc groove end plate, a fixing screw is clamped at one corner of the top surface of the L-shaped support main body through a thread, and the other corner of the top surface of the L-shaped support main body is fixedly connected with the mounting arc groove end plate. An adjusting long rod is installed in the middle of the top end of the installation arc groove end plate in a penetrating mode, and the inclination angle of the laser generator is displayed through the marking arc-shaped plate. The numerical value pointed by the laser generator displayed on the arc-shaped marking plate is the angle and the slope ratio of the slope, so that the measurement of the slope is completed, the convenience of the slope measurement process of the measurement device is effectively improved, the laser generated by the laser generator can also be used as a reference in the slope trimming process, the function of the measurement device is further expanded, and the measurement efficiency is improved. And the use convenience of the measuring device is improved.

The utility model belongs to the field of roadbed slope construction, and particularly relates to a device for quickly detecting a slope ratio, which comprises a pipe sleeve provided with a through hole along the length direction of the pipe sleeve; the vertical rod is arranged in the through hole in a penetrating mode, the first end of the vertical rod is positioned in the pipe sleeve through a first locking piece, and the second end of the vertical rod is rotationally connected with a first magnetic attraction block; the transverse rod is vertically fixed to the side wall of the pipe sleeve, and the end, away from the pipe sleeve, of the transverse rod is rotationally connected with a second magnetic attraction block; the first magnetic attraction block and the second magnetic attraction block are attracted to the inclined rod, so that a right triangle structure is formed among the vertical rod, the cross rod and the inclined rod; the right triangle formed by the cross rod, the vertical rod and the inclined rod is used for calibrating the slope ratio of a site, the vertical rod is adjusted to different lengths, so that the right triangle has different shapes, and the device can be used for side slopes with various slope ratios and is high in practicability.

The invention relates to the technical field of geological engineering, in particular to a dangerous rock mass stability evaluation result verification method based on historical data comparison, which comprises the following steps: acquiring dangerous rock mass frequency and mechanical monitoring data, dividing stable and critical working conditions, constructing a steady state and critical state offset difference surface and an energy gravity center coupling difference surface, and verifying a dangerous rock mass stability evaluation result. And the seismic oscillation triggering frequency and the instability frequency are analyzed to form load triggering comparison information, the fracture expansion rate and the displacement variation are calculated, the stage state is quantified, and stage joint verification data are output. Through frequency slope identification, mechanical parameter offset description, frequency domain energy and gravity center direction coupling, load triggering and instability proportion offset, and crack and displacement joint quantification, continuous determination of a stage state is realized, critical signal identification sensitivity is improved, multi-source evidence consistency is enhanced, objectivity and reverifiability of result verification are optimized, and the method is suitable for popularization and application. Empirical dependence is reduced, and stability evaluation and observation response are in close correspondence.

The application relates to the technical field of building model construction, in particular to a building BIM model construction method fusing GIS terrain and site information, which solves the technical problems of great design result safety hidden dangers and poor specification compliance in the process of complex geological condition slope modeling caused by the fixed slope ratio static modeling method in the prior art. The method comprises the following steps: discretizing a continuous three-dimensional space of a to-be-constructed slope into a two-dimensional grid matrix, and giving each grid node in the two-dimensional grid matrix with a rock layer inclination attribute and a cost attribute; in the two-dimensional grid matrix, taking a digging starting point as a search starting point, and determining an optimal path from the digging starting point to a surface boundary through an extended state space search algorithm; and generating an excavation contour line of a target section according to the optimal path.

The invention discloses an unmanned aerial vehicle image-based slope erosion monitoring method, which comprises the following steps of: acquiring a multi-angle image sequence through an unmanned aerial vehicle, extracting initial slope contour data, obtaining a slope ratio initial estimation value to correct a slope model, obtaining a model after deformation correction, and extracting a crack distribution coordinate set; carrying out matching calculation on the crack distribution coordinate set and the gradient ratio, analyzing deviation and updating projection parameters; rebuilding a three-dimensional slope model by using the updated projection parameters, extracting slope length ratio and slope direction ratio parameters, generating an erosion distribution layer graph, and obtaining a synchronous matching result of the crack and the ratio; and according to the ratio deviation distribution of the synchronous matching result and the initial image sequence, carrying out loop iteration adjustment projection until the deviation is lower than a threshold value, judging the final matching consistency, and outputting complete eroded part positioning data. According to the method, accurate positioning of the erosion part and accurate quantification of slope features are realized, and powerful support is provided for geological disaster assessment and prevention and control under complex terrains.

The utility model relates to the technical field of side slope ratio measurement, and discloses a side slope ratio measuring device which comprises a measuring rod, a protractor and a pointing needle, the measuring rod comprises a main rod and an auxiliary rod, one end of the main rod is provided with a limiting bolt, the main rod is rotatably connected with the auxiliary rod through the limiting bolt, and the protractor is connected with the pointing needle. A fixing mechanism is arranged on one side of the main rod and used for fixing the relative angle between the main rod and the auxiliary rod, the protractor is fixedly connected to the middle of the main rod and arranged in the length direction of the main rod, and a screw set is arranged in the center of the protractor and used for fixing the protractor. Through the cooperative arrangement of the main rod, the protractor and the pointing needle, after the main rod is placed on the ground with the gradient, the pointing needle is perpendicular to the ground under the action of gravity, the gradient of the current ground can be obtained by checking the indication reading of the pointing needle on the protractor, the time required for measurement is shortened, and the construction efficiency is improved.

This invention discloses a method for slope finding at roof drain outlets, comprising: (1) roof waterproofing layer construction and placement of isolation layer; (2) selection of slope finding tool with appropriate cross-section; (3) determination of the height of slope change point; (4) installation of steel mesh; (5) fabrication and installation of slope finding tool; (6) setting of internal insert and completion of elevation; (7) construction of steep slope surface and gentle slope surface inside and outside the slope finding tool respectively. This invention also discloses a slope finding tool for the above-mentioned slope finding method. In this technical solution, the slope finding tool is set up and used as a pouring template during construction, which solves the problem of waiting for initial setting before fine finishing when different slope ratios are formed during slope finding, and also avoids problems such as concrete flowing and not fixing due to different slope ratios, realizing one-time pouring and simultaneous finishing, and slope surfaces with different slope ratios can be formed inside and outside the slope finding tool respectively, thereby improving construction efficiency.

The invention discloses a CAD terrain gradient analysis and daily standard wind speed increase coefficient calculation method. The method comprises the steps that all vertexes of a target broken line in a contour line section CAD graph are extracted; according to the slope of a connecting line between two adjacent vertexes, extracting a transition line segment with a changed slope; calculating the height difference of the i-th transition line segment and the included angle between the i-th transition line segment and the vertical auxiliary line; calculating a first coefficient, a second coefficient and a third coefficient; and calculating a daily standard wind speed increase coefficient corresponding to the i-th transition line segment according to the sum. The method solves the problems that in CAD topographic map design, when line segments with changed gradients in broken lines of a contour profile map are manually extracted, batch processing of the broken lines is needed, time is wasted, and efficiency is low; meanwhile, the prior art lacks the function of automatically calculating the wind speed increase coefficient under the daily standard specification.

This invention discloses a method and apparatus for simulating the uplift process of ancient uplifts based on discrete element method (DEM) calculations. The method includes: determining the maximum slope of the fitted curve equation based on the upper boundary of the ancient uplift, thereby determining the initial overlap ratio of the particles; filling a rectangular box model of a second specified size with particles of a first specified size, ensuring the bottom particles have an initial overlap ratio, to obtain a first DEM model; determining the microscopic parameters of the granular materials of each stratum simulated using the first DEM model through biaxial compression experiments; setting the parameters of the first DEM model using the microscopic parameters of the granular materials and strata information to obtain a second DEM model; calculating the uplift vertical velocity of each particle at the bottom of the model based on the vertical velocity of the specified particles and the maximum value of the fitted curve; and simulating the uplift process of each particle at the upper boundary of the ancient uplift according to its uplift vertical velocity. This invention can simulate the uplift process of ancient uplifts with different geometric shapes.

The application provides a landslide early warning method and system, comprising: obtaining inclination monitoring data collected by an inclination sensor in a landslide body and preprocessing the inclination monitoring data; obtaining a time sequence and an inclination sequence corresponding to the time sequence; constructing an inclination and time fitting function according to the time sequence and the inclination sequence; calculating a tilt rate data sequence by derivation of the inclination and time fitting function; calculating a slope of the tilt rate data sequence; and calculating a tangent angle and determining a landslide early warning level according to the slope of the tilt rate data sequence. The application can solve the problem of low identification sensitivity of the existing landslide early warning method and system in the initial stage of slope body deformation.

The invention relates to an urban construction land climbing multi-dimensional identification and classification system based on dynamic and static coupling in the technical field of smart city and territorial space intelligent treatment, and the system comprises a static index calculation module which calculates the slope rate of urban construction land based on DEM data by taking 4.57 degrees as a threshold value, and divides the slope rate into three static background types of high, medium and low; the dynamic index calculation module is used for calculating an average construction land climbing index and an upper limit gradient change value on the basis of multi-stage land utilization data, and dividing the average construction land climbing index and the upper limit gradient change value into three dynamic trend types of high dynamic climbing, low dynamic climbing and horizontal expansion; the comprehensive classification decision module is embedded with a double-index cross classification matrix, combines three static background types and three dynamic trend types, and finally outputs nine comprehensive climbing types; and the result output module is used for generating a city planning suggestion structured report. And full-chain intelligent analysis is realized by coupling the static slope rate and the dynamic climbing index, and an accurate decision basis is provided for territorial space planning.

This invention relates to the field of intelligent prediction technology, and discloses a method and system for predicting the effect of roadbed solidification based on deep learning. The method includes evaluating the matching degree between the soil and the solidifying agent and generating a score. If qualified, a preliminary strength trend curve is constructed based on the material ratio and ambient temperature, and its baseline slope is determined. Subsequently, the slope is analyzed in conjunction with environmental geological parameters to identify nonlinear critical nodes and potential inflection intervals in the solidification process. For this interval, the soil moisture content and ambient temperature are extracted, and the preliminary trend curve is dynamically coupled and corrected to generate an optimized strength growth model. The model is used to calculate simulated predicted values, and the deviation from the actual values ​​is used to determine iterative correction parameters, thereby optimizing and generating a corrected strength distribution map. This map is compared with a safety threshold to complete the solidification effect evaluation. Finally, an optimized ratio scheme is generated based on the evaluation conclusions. This method can improve the accuracy of predicting the inflection point of solidification strength.

According to the nonlinear strength criterion of the rock-soil body, the stress condition when the strength of the rock-soil body is damaged meets the formula: q / 2 = a (p / 2) 2 + b (p / 2) + C0, the principal stress sigma1 when the rock-soil body is damaged under different surrounding rocks sigma3 is obtained through a conventional triaxial shear test of the rock-soil body, and the specific numerical values of parameters a, b and C0 are solved through quadratic regression analysis between q / 2 and P / 2. C0 can also be measured through a tensile strength test, so that a rock-soil body strength criterion formula is obtained; the strength criterion is derived on the basis that the rock-soil body begins to crack from the maximum shear stress surface, the influence of the initial cohesion and the maximum shear surface pressure stress on the cohesion is considered, the uncertainty of determining parameters by drawing a Mohr circle tangent in the traditional Mohr-Coulomb criterion is avoided, the fitting precision of test data is improved, and the test efficiency is improved. And meanwhile, the calculation accuracy in practical application is improved, and the solved tangent slope is less than or equal to 1.0, which accords with the definition of physics on the friction coefficient.

This invention provides a method and related apparatus for calculating the comprehensive critical stability slope ratio of multi-soil riverbank slopes. The method includes: selecting a target bank section and obtaining soil layer distribution data and soil physical and mechanical parameters of the target bank section; based on the soil layer distribution data, performing linear fitting on the scattered sequence of natural bank slope morphology to simplify the bank slope morphology; then, according to the soil layer interface elevation and river water level elevation, vertically dividing the simplified bank slope into blocks; based on the divided soil blocks and the soil physical and mechanical parameters, calculating the sliding force and anti-sliding force of each soil block, thereby obtaining the total sliding force and total anti-sliding force; based on the total sliding force and total anti-sliding force, adjusting the slope toe θ value through trial calculations until the total sliding force equals the total anti-sliding force, and outputting the corresponding critical stability slope ratio as 1:1 / tanθ. This invention can solve the problem of the lack of theoretical support in existing empirical methods, and can be used to assess bank slope stability and bank collapse risk, ensuring flood control safety and river stability.

The embodiment of the application discloses a kind of elevation data correction coefficient calculation methods based on gradient, belong to the technical field of hydrodynamic simulation, including the following steps: download and obtain the initial DEM data needing correction, then download the DEM data with higher resolution than initial DEM data;The gradient of the grid point corresponding to two different resolution DEMs is calculated;According to the gradient value calculated in step two, the correction coefficient is analyzed and calculated;The gradient of the grid point corresponding to two different resolution DEMs is calculated, i.e. The ratio of grid elevation difference and horizontal distance between grid center points;And according to the gradient value calculated by different resolution DEM, the correction coefficient is calculated, which is used in the calculation of bottom slope slope term in two-dimensional hydrodynamic model. The low-resolution DEM data is corrected by proposing the correction coefficient, which improves the accuracy and calculation efficiency of subsequent two-dimensional hydrodynamic simulation. The calculation process of the present application is simple, easy to operate and easy to promote.

The invention is suitable for the technical field of hydraulic engineering and computer aided design and optimization, and provides a reservoir area excavation automatic design method and system based on an intelligent optimization algorithm, and the method comprises the steps: inputting topographic data, target reservoir capacity, reservoir bottom elevation, slope ratio and other design constraints; discretizing a to-be-optimized library top line into an ordered point sequence as a decision variable; constructing a target function which takes the minimum excavation volume as a target and introduces a penalty function to process reservoir capacity constraints; and searching in the decision variable space by adopting an intelligent optimization algorithm, and automatically generating a reservoir area excavation contour line which meets all engineering constraints and has the minimum excavation volume. According to the method, a complex engineering design problem is converted into a computable optimization model, through automatic and intelligent search, the defects that a traditional method is low in efficiency, depends on experience and is difficult to obtain an optimal solution are overcome, and the design efficiency and the engineering economy are remarkably improved.

Techniques for determining properties of a rock sample include performing a plurality of series of permeability measurements of a rock sample with a permeability test assembly to derive permeability values, where each series includes permeability measurements of the rock sample at a respective, constant differential pressure between a particular confining pressure and a particular pore pressure; for each series of the plurality of series, performing a curve fit operation to determine a slope and an intercept of a curve associated with a selected Biot coefficient, the permeability values, and the particular pore pressures to generate a plurality of slope values and a plurality of intercept values; determining an effective stress coefficient of the rock sample; and determining an actual Biot coefficient of the rock sample.

The invention provides a downstream horizontal contraction type gravity dam design method, which relates to the technical field of water conservancy and hydropower engineering, and comprises the following steps: firstly, preliminarily judging whether the gravity dam can be designed or not according to geological conditions, drawing a non-contraction vertical view, initially calculating the stress stability condition, and determining a geological weathering zone where a foundation surface is located; then, drawing a typical elevation tangent map, and determining an elevation position where the foundation surface shrinks to the downstream; secondly, initially fitting a contraction plane angle, taking a minimum value as a unified angle, rechecking the slope ratio of the downstream foundation building surface, and determining a new angle if the requirement is not met; and according to the finally determined angle, a plane excavation drawing, a vertical view and a cross section drawing are drawn, and the anti-overturning stability, the anti-sliding stability and the dam foundation stress in the construction period are checked and calculated. According to the design method provided by the invention, the concrete filling volume and excavation volume can be reduced, the slope height is reduced, and the construction cost is saved.

The invention discloses a method for estimating the vertical uplift bearing capacity of a single pile. The method comprises the following steps that S1, multi-dimensional basic parameters such as geology, a pile body and a construction process are collected; s2, a pre-estimation model containing a multi-stratum side friction weighted calculation module, an underground water level influence correction module and other modules is constructed, and single pile stress is accurately simulated; s3, basic parameters are input into the model to calculate ultimate bearing capacity, and then characteristic values are converted; s4, acquiring field detection data, iteratively optimizing model parameters by using a Bayesian updating algorithm, and outputting an updated bearing capacity estimated value and a confidence interval; s41, load and displacement curve inflection point slopes are introduced, anchoring system stress monitoring data serve as iteration variables, and key parameters are optimized; and S5, outputting a result according to a standard format. According to the method, the estimation accuracy and reliability are improved, the timeliness and adaptability are ensured, the estimation accuracy and timeliness are improved, influence factors are comprehensively considered, the method conforms to engineering practice, and a scientific basis is provided for engineering design and construction.

The utility model relates to the technical field of construction measurement, and particularly discloses a slope ratio measuring tool which comprises a supporting assembly, and the supporting assembly is provided with a measuring assembly facilitating slope angle measurement. The supporting assembly comprises a bottom plate, sinking tables are arranged on the two sides of the upper end of the bottom plate, the measuring assembly comprises bases arranged in the sinking tables, semi-arc-shaped plates are oppositely arranged between the bases in the front-back direction, and grooves are formed in the opposite faces of the semi-arc-shaped plates. Through the arrangement of the measuring assembly, the bottom plate is placed on a slope surface, the limiting of the T-shaped sliding column is relieved through the limiting assembly, the conical pendant and the connecting rod rotate with the rotating shaft as a rotating point under the action of gravity, the sleeve at the upper end of the rotating shaft and the T-shaped sliding column are driven to rotate, and when the T-shaped sliding column rotates, a first spring in the sleeve pushes the T-shaped sliding column; the T-shaped sliding column rotates under the limit of the groove until the conical pendant is perpendicular to the horizontal plane, the rotation angle of the pointer is recorded, the overall structure is simple, and the operation simplicity and convenience are improved.

The invention provides a landslide disaster precursor identification and early warning method, device and equipment, and the method comprises the steps: obtaining the inclination angle monitoring data of a to-be-detected slope, the inclination angle monitoring data comprises the inclination angle values of the to-be-detected slope at different times, and the inclination angle values are the included angle values between the slope surface of the to-be-detected slope and an inclination angle detector; performing denoising processing on the inclination angle monitoring data to obtain target inclination angle monitoring data; determining a dip angle change speed based on the dip angle monitoring data; calculating a target parameter based on the dip angle change speed and the corresponding time, wherein the target parameter is related to the slope of the dip angle change function of the slope to be measured; based on the target parameter and a plurality of pre-constructed different parameter thresholds, determining a target risk degree of a current landslide disaster of the to-be-detected slope, wherein different parameter thresholds correspond to different risk degrees; carrying out landslide disaster precursor identification on the to-be-detected slope based on the target risk degree; and outputting an alarm in response to the identification result representing that the to-be-detected slope has the landslide disaster precursor.

This invention discloses a tunnel deformation analysis method and system based on multi-source data fusion. The method includes: calculating and sorting the loosened zone expansion index after correction by the surrounding rock integrity coefficient; selecting cross-sections in sequence for mechanical state inversion to obtain the stress release coefficient and plastic zone radius, and selecting key cross-sections based on the stress release coefficient exceeding a threshold; calculating instability characteristic values ​​using catastrophe theory based on the inversion parameters, and constructing a spatial distribution matrix of instability characteristic values ​​by combining the distance between cross-sections; performing principal component analysis on the matrix, extracting the score of the first principal component as a comprehensive instability index, and generating a longitudinal instability risk curve; identifying segments on the curve with slopes exceeding a threshold as potential instability expansion segments, and identifying weak points in the support within these segments based on the depth-to-displacement ratio acceleration. This method achieves quantitative description of the surrounding rock loosening range, mechanical parameter inversion, instability risk quantification, and precise location of weak points, significantly improving the intelligence level of tunnel stability analysis.

The invention discloses a U-shaped butt joint well bore structure design method which comprises the following steps: firstly, acquiring geological, geophysical and engineering monitoring data of a target work area, building a three-dimensional geomechanical model, accessing measurement while drilling data during drilling, and updating and acquiring a dynamic geomechanical model in real time through a model self-learning module; secondly, generating a preliminary borehole trajectory based on the model, calculating the risk probability of the borehole trajectory, generating a risk probability distribution cloud chart, and generating a basic and standby wellbore structure scheme by using a multi-objective optimization algorithm; thirdly, a three-dimensional virtual target area is arranged on the upstream of the target entering point of the horizontal section, the position and shape of the target area are dynamically adjusted, and the build-up rate is corrected; then, calculating a three-dimensional dynamic safe drilling window; and finally, inputting the scheme, the track and the window into an integrated design platform for coupling simulation, outputting an optimal scheme, feeding actual drilling data back to the previous steps, and starting the next round of model updating optimization.

The invention provides a multi-soil-layer river bank slope comprehensive critical stable slope ratio calculation method and a related device, and the method comprises the steps: selecting a target bank section, and obtaining soil layer distribution data and soil physical and mechanical parameters of the target bank section; based on the soil layer distribution data, performing linear fitting on the scatter point sequence of the natural bank slope form to simplify the bank slope form; according to the elevation of a soil layer interface and the elevation of a river channel water level, the simplified bank slope is subjected to vertical blocking; based on the divided soil blocks and the physical and mechanical parameters of the soil body, the sliding force and the anti-sliding force of each soil block are calculated, and then the total sliding force and the total anti-sliding force are obtained; based on the total sliding force and the total anti-sliding force, the slope toe theta value of the bank slope is adjusted through trial calculation till the total sliding force is equal to the total anti-sliding force, and the corresponding critical stable slope ratio 1: 1 / tan theta is output. The method can solve the problem that an existing experience method lacks theoretical support, can be used for evaluating bank slope stability and bank collapse risks, and guarantees flood control safety and river regime stability.

This invention discloses a method for measuring the slope ratio of silt-retaining dams on the Loess Plateau, specifically implemented according to the following steps: Step 1, planning the UAV flight mission and constructing a geometric measurement model of the dam slope ratio; Step 2, acquiring images according to predetermined photographic positions and angles, and selecting images that meet the orthophoto requirements of the model; Step 3, extracting the UAV imaging altitude information from the images that meet the imaging requirements, extracting the model parameter information of feature targets in the images, and performing calculations. This invention achieves high-precision and high-efficiency measurement by constructing a mathematical measurement model of the silt-retaining dam slope ratio; by obtaining the scale relationship of the captured images through orthophoto recognition of silt-retaining dam feature indicators, an accurate spatial relationship between the UAV and the silt-retaining dam is established; and by employing a dual screening process of on-site interactive acquisition and image imaging analysis, the compliance of the acquired images is ensured, information extraction is completed quickly, and the needs of efficient thematic interpretation are met.

The invention provides an approximate real earth surface prestack depth migration reference surface construction method, and relates to the technical field of petroleum seismic exploration, and the method comprises the steps: constructing a small smooth earth surface reference surface, and eliminating the earth surface topographic change with the scale range within 10 meters through small-scale smoothing processing; elevation interpolation and slope calculation: carrying out B-spline interpolation on the smoothed surface elevation and calculating an elevation slope value; elevation slope smoothing and normalization are carried out, Robust local weighting linear regression fitting and smoothing processing are carried out on the slope value, and linear normalization is carried out; and performing weighted downward movement on the slope, and constructing a new offset reference surface by taking the smoothed and normalized slope value as a weight. According to the method, weighting processing is carried out on the down-shift amount of the reference surface by using the surface elevation slope, so that the change trend of the surface elevation is maintained to the greatest extent, the transformation of actual wave field travel time is reduced, and the pre-stack depth migration result is more accurate and reliable.

The utility model relates to a trench excavation device capable of controlling excavation depth and slope ratio. Comprising a main excavator bucket, a connecting assembly used for being connected with an excavator arm is installed at the top of the main excavator bucket, adjustable side excavator buckets are arranged on the left side and the right side of the main excavator bucket, each adjustable side excavator bucket comprises a back plate and a side plate located on the outer side of the back plate, and the bottom edge of each side plate is connected with the bottom of the side wall of the main excavator bucket in a hinged mode through a hinge. The back plate is located on the rear portion of the rear wall of the main excavator bucket, a plurality of connecting holes are formed in the edge of the inner side of the back plate, a plurality of arc-shaped angle adjusting holes are formed in the corresponding positions of the rear wall of the main excavator bucket, and angle adjusting bolts are arranged in the connecting holes and the angle adjusting holes. The left side wall and the right side wall of the main excavator bucket are respectively provided with a plurality of groups of depth adjusting holes, the device further comprises a left depth limiting lever and a right depth limiting lever which are horizontally arranged, and the roots of the depth limiting levers are fixedly connected with the side walls of the main excavator bucket through depth adjusting bolts. According to the utility model, the excavation depth of the groove and the excavation slope ratio of the groove can be set, the groove meeting the design requirement can be quickly formed in the set excavation construction, the manpower is saved, and the construction period is shortened.

This invention discloses a method for determining the effective stress coefficient of formation rocks, belonging to the field of oil drilling technology, including collecting data from H points at different depths of the target formation. i Measured formation pressure P Pi ; Obtain the corresponding depth point H i The pressure σ of the overlying strata at the location Vi and effective stress σ Vi Based on Biot's effective stress formula, calculate the sum at different formation depths and plot the X-ray. i -Y i In a cross-plot, the slope of the linear fitted line passing through the origin is the effective stress coefficient of the formation rock. This invention does not rely on well logging sonic velocity; it can conveniently and efficiently obtain the effective stress coefficient of the formation rock by calculating the overlying rock pressure using well logging volumetric density and combining it with measured formation pressure.

The present application relates to the technical field of geological engineering, in particular to a dangerous rock mass stability evaluation result verification method based on historical data comparison, comprising the following steps: obtaining dangerous rock mass frequency and mechanical monitoring data, dividing stable and critical working conditions, constructing stable and critical state offset difference surface and energy barycenter coupling difference surface, analyzing seismic motion trigger frequency and instability frequency to form load trigger comparison information, calculating crack propagation rate and displacement variation and quantifying stage state, and outputting stage joint verification data, in the present application, through frequency slope identification, mechanical parameter offset depiction, frequency energy and barycenter direction coupling, load trigger and instability proportion offset, crack and displacement joint quantification, continuous determination of stage state is realized, critical signal identification sensitivity is improved, multi-source evidence consistency is enhanced, objectivity and reproducibility of result verification are optimized, experience dependence is reduced, and stability evaluation and observation response are closely corresponded.