11 results about "Failure zone" patented technology

The invention discloses a deep tunnel surrounding rock mechanical parameter inversion method based on a three-dimensional brittle failure zone contour and sparrow optimization algorithm-information vector machine (SSA-IVM) combined optimization algorithm. The engineering technical problem that due to the fact that excavation instantaneous displacement is difficult to monitor, deep tunnel surrounding rock mechanical parameters are difficult to reasonably obtain through displacement back analysis is solved. The method comprises the following steps: firstly, constructing a tunnel FLAC3D numerical simulation model with the same ground stress condition at the occurrence position of a three-dimensional brittle failure zone; secondly, taking an absolute error between the total number of computational grid units in the actually measured brittle failure zone and the total number of computational grid units entering a plastic state in the range of the actually measured brittle failure zone after calculation of the FLAC3D numerical model as an optimization objective function; and then, by taking the tunnel surrounding rock mechanical parameters as optimization variables and taking a target function reaching a global minimum value as a target, performing global optimization by combining a tunnel FLAC3D numerical model and adopting an SSA-IVM joint optimization algorithm, thereby obtaining reasonable tunnel surrounding rock mechanical parameters.

The present application relates to a kind of coal mine floor failure zone development height real-time measurement method, between working face haulage roadway and air return roadway, excavate two groups of V-type symmetrical boreholes, the symmetry axis of two groups of V-type symmetrical boreholes is respectively perpendicular to working face advancing direction, parallel;Distributed sensing optical cable is worn into V-type symmetrical borehole, and the strain distribution data of distributed sensing optical cable in V-type symmetrical borehole is collected in real time;Based on the interface of failure zone is distinguished according to strain distribution characteristics, and the development height of floor failure zone is dynamically output;V-type symmetrical borehole structure makes fiber form cross monitoring network in floor profile, and two-way strain information can be obtained at the same depth, solve the problem that vertical single hole cannot accurately distinguish the interface of failure zone and guide uplift zone.It is continuous strain monitoring in the length range of whole borehole by distributed optical fiber, can capture the whole process dynamic evolution of floor failure zone development, overcome the defect that traditional method can only intermittent measurement.

The present application relates to coal filling mining technical field, specifically to a kind of goaf end floor filling subsidence reduction method, including determining the range of floor failure zone below coal seam, select certain thickness of rock stratum as floor pressure protection layer below floor failure zone;The floor area of goaf directly below in the masonry beam structure is used as the goaf end range for grouting;The bottom interface of floor pressure protection layer is used as grouting horizon, grouting drilling hole is connected grouting horizon;Working face is mined, when grouting from certain grouting drilling hole can be filled into floor pressure protection layer, paste-like filling material is injected into grouting horizon from the grouting drilling hole.The present application forms basin bottom type goaf structure by paste-like filling in the end of goaf floor, can effectively support the overburden strata in the delamination zone of masonry beam structure in the two sides of mining boundary, control the development degree of delamination zone fracture and surface fissure.The present application can reduce surface subsidence, save filling cost.

Provided are wellbore sealing devices. The wellbore sealing devices comprise a plug body, a sealing device component for coupling to the plug body, and a matrix material. In some examples, the sealing device component includes a reinforced region having reinforcement fibers and a preferential failure zone outside of the reinforcement region with reduced or omitted reinforcement fibers. In examples, the matrix material may be molded about the reinforcement fibers to form the sealing device component with the reinforcement fibers embedded therein.

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 application discloses a method and system for identifying the range of failure characteristics of surrounding rock in tunnels. It accurately identifies the range of various failure characteristics of the surrounding rock, which has significant theoretical and engineering implications for tunnel stability evaluation, support structure design, and construction safety control. The embodiments of this application are based on a quantitative method for identifying the failure characteristics of surrounding rock using plastic strain and volumetric energy dissipation rate. The loosening zone is defined by the Pearson correlation coefficient between plastic shear strain and volumetric strain; the boundary within the undisturbed zone is determined by the near-zero characteristic of the volumetric energy dissipation rate and its correlation coefficient, thereby accurately identifying the excavation influence range. A continuous and quantitative identification system from the loosening zone to the undisturbed zone is constructed, possessing a clear physical basis. It can reveal the spatiotemporal evolution law of the failure zone and provides a reliable basis for anchor bolt design, support optimization, and engineering stability assessment, combining theoretical innovation with engineering practicality.

This invention provides a comprehensive monitoring and treatment method for the surrounding rock damage area in deep unloaded hard rock tunnels under blasting disturbance, belonging to the field of rock mass engineering monitoring technology. This invention extracts the reference amplitude sequence, reference phase sequence, disturbance amplitude sequence, and disturbance phase sequence by performing a Hilbert transform on the radar reflected wave sequences before and after blasting disturbance; constructs an amplitude difference term and a phase amplitude interference term and performs nonlinear coupling to obtain a time-shifted differential signal sequence; performs a Hilbert-Huang transform on it, multiplies the frequency domain weighting term by the square of the time-varying amplitude and integrates to obtain the cumulative marginal energy; calculates the cumulative damage index by combining a fractional damping term and an exponential decay term; delineates the damage area based on the spatial distribution of the cumulative damage index exceeding a preset threshold at each collection point, and outputs the surrounding rock damage result by comparing the maximum value of the index within the damage area with a preset level interval, thereby achieving accurate quantitative definition of the hidden damage boundary of deep surrounding rock and efficient early warning of engineering disasters.

The invention discloses a quantitative characterization method and device for underground cavern excavation surrounding rock damage failure stress driving, and belongs to the technical field of rock mechanics and underground engineering. The method comprises the steps of firstly calculating first principal stress and third principal stress distribution of cavern surrounding rock based on an elastic theory; furthermore, a stress driving index (SDI) is innovatively defined to quantify the driving effect of stress on damage, and a relative shear strength index (RSSI) is defined to represent the shear strength of the rock mass. Curves of SDI and RSSI changing along with the distance are drawn in the same coordinate system, the intersection point A of the two curves serves as a critical judgment point, the area between the point A and the free face of the cavern is a damage area with the stress driving effect exceeding the rock mass strength, and the point A is a stable area with the depth. The method is clear in concept and easy and convenient to calculate, the surrounding rock damage range can be rapidly and quantitatively determined without complex numerical simulation, and an efficient and reliable theoretical tool is provided for stability evaluation and support design of underground engineering.

A system for intelligent crack detection and crack propagation prediction in concrete structures using multi-sensor data fusion, consisting of: a plurality of sensor units arranged in operational connection with a concrete structure, wherein the plurality of sensor units includes at least one acoustic sensor unit for detecting elastic wave emissions within the concrete structure, at least one strain sensor unit for generating deformation-related signals, at least one vibration sensor unit for generating dynamic response signals, and at least one thermal sensor unit for generating temperature change signals;a signal conditioning unit electrically connected to each of the numerous sensor units, the signal conditioning unit comprising an amplification circuit, a filter circuit, and a noise reduction circuit configured to condition the raw analog signals received from the numerous sensor units; a data acquisition unit coupled to the signal conditioning unit, the data acquisition unit comprising an analog-to-digital converter circuit configured to convert the conditioned analog signals into digital data streams at predefined sampling intervals;a processing unit operationally connected to the data acquisition unit and a storage unit, wherein the processing unit is configured to perform time synchronization of the digital data streams, extract features from multiple domains, including amplitude characteristics, frequency distribution characteristics, energy variation characteristics, and spatial gradient characteristics, and generate a fused structural state representation by correlating the extracted features from the multitude of sensor units; a localization unit operationally connected to the processing unit and configured to determine the spatial coordinates of crack initiation within the concrete structure based on the transit-time differences of signals received from a multitude of sensor units;a prediction unit that is operationally integrated into the processing unit and configured to determine the crack propagation direction, propagation speed, and potential failure zones by analyzing temporal variations in the representation of the molten structural state; and an output interface unit configured to transmit processed structural state data and warning signals indicating crack formation and propagation to an external monitoring device.

The application provides a kind of deep hard rock tunnel surrounding rock stability three-dimensional dynamic quantification evaluation method, it is related to deep tunnel surrounding rock stability evaluation and intelligent construction technical field, the method comprises: based on the dynamic determination of tunnel geology and surrounding rock parameters based on digital means and in-situ testing means;Based on the rapid calculation of stress distribution in the failure zone considering three-dimensional complex high ground stress based on GZZ three-dimensional strength criterion;Based on the rapid quantitative solution method of failure zone distribution form based on artificial intelligence algorithm.The application takes stress accurate control and fine analysis as the tunnel design concept, based on considering the joint, fracture, excavation disturbance of deep tunnel surrounding rock, and the strength characteristics and mechanical mechanism of surrounding rock, using the powerful global optimization ability of intelligent algorithm and the high efficiency calculation characteristics of traditional analysis method, a programmed process is obtained for calculating the surrounding rock failure zone, realizing the accurate, rapid and dynamic analysis of surrounding rock stability in the process of tunneling.

This invention discloses a landslide risk assessment method based on slope surface deformation, belonging to the field of geological disaster engineering. The method includes: constructing a landslide cross-section model; dividing the landslide area into different landslide types; determining tensile and compressive failure zones; dividing the area into several soil strips; and constructing a formula for calculating the safety factor. The calculation formula is used to iteratively correct the internal friction angle of the sliding body and the residual friction angle on the sliding surface. The actual soil strip safety factor is calculated under the conditions of proportionality coefficients R=1 / 2 and R=1 / 3, and then corrected. Based on the final soil strip safety factor, a landslide risk coefficient is calculated to assess the stability of the landslide area. This invention utilizes surface deformation velocity and sliding surface location to determine the landslide failure mode, proposes a local Janbu method considering the properties of the failure zone to determine the residual shear strength of the sliding surface, and combines the proportion of the failure zone to assess the potential risk of the landslide—a high-precision stability assessment method.