CN108278109B - Method, equipment and system for determining reinforcement time of weakened surrounding rock of underground engineering - Google Patents
Method, equipment and system for determining reinforcement time of weakened surrounding rock of underground engineering Download PDFInfo
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
- E21B49/003—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells by analysing drilling variables or conditions
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
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- G06Q50/00—Systems or methods specially adapted for specific business sectors, e.g. utilities or tourism
- G06Q50/02—Agriculture; Fishing; Mining
Abstract
The application discloses a method, equipment and a system for determining reinforcement time of weakened surrounding rock of underground engineering. The determination method comprises the following steps: acquiring the surrounding rock strength of different depths at a set observation area of an excavation body in different time periods on site, and calculating the average surrounding rock strength in different time periods; fitting the corresponding relation of the average intensity of the surrounding rock along with the change of time; and calculating the corresponding time when the average intensity of the surrounding rock is weakened to the set intensity according to the corresponding relation. In underground engineering, the surrounding rock is affected by underground water conditions, the physical and mechanical properties of the surrounding rock are weakened to a certain extent along with time, and in order to ensure the stability of the surrounding rock of the underground engineering, the surrounding rock needs to be reinforced before being weakened to a safety limit. By the scheme, the change situation of mechanical indexes of weakened surrounding rocks along with time can be obtained more quickly and directly, the weakening degree of the surrounding rocks is reflected more truly, and the surrounding rock reinforcement opportunity is guided in a targeted manner.
Description
Technical Field
The present disclosure relates generally to the field of safety technologies for underground works, and in particular, to a method, a device, and a system for determining reinforcement time for weakened surrounding rock of underground works.
Background
With the continuous development of underground engineering construction in China, the underground engineering construction gradually extends to complex geological conditions, and due to the complexity of rock strata and the restriction of detection range and accuracy of the existing detection technology, the situation that water is sprayed from a water-rich rock stratum can be met in the process of roadway excavation. Due to the different properties of the surrounding rocks, the weakening and hydrolysis characteristics of different rocks after meeting water are different. In the existing underground engineering construction design, generally, a method of drilling and sampling on site and then performing indoor test on an obtained sample is used for obtaining the weakening characteristic of a rock after meeting water, and then a corresponding supporting method is designed according to the weakening characteristic.
The method comprises the steps of using an indoor test, needing to drill from a site to core, then transporting a rock sample to a laboratory, simulating a site rock weakening state under a groundwater condition by carrying out bubbling and sprinkling treatment on the rock sample, and obtaining the weakening characteristic of the rock after meeting water by testing relevant mechanical parameters of the weakened rock sample.
However, the above method has the following disadvantages:
1. the process needs to go through links such as drilling coring, transportation, rock sample water spraying simulation and the like, so the time interval from field coring to test report obtaining is long, and the construction period is delayed.
2. The test report cannot rapidly give the optimal supporting time of weakened surrounding rocks under the influence of underground water conditions, the problem of the optimal supporting time is not considered in the conventional design, and the optimal supporting time is usually missed when the test report is obtained.
Disclosure of Invention
In view of the above-mentioned deficiencies or inadequacies in the prior art, it would be desirable to provide solutions for opportunities to weaken the reinforcement of surrounding rock in underground works.
In a first aspect, an embodiment of the present application provides a method for determining reinforcement time of weakened surrounding rock of underground engineering, including:
acquiring the intensity of the weakened surrounding rocks at different depths in a set observation region of the excavation body in different time periods on site, and calculating the average intensity of the weakened surrounding rocks at different time periods;
fitting and weakening the corresponding relation of the average intensity of the surrounding rock along with the change of time;
and calculating the corresponding time when the average intensity of the weakened surrounding rock reaches the set intensity according to the corresponding relation.
The method further comprises the following steps: the initial surrounding rock strength of the excavation body at different depths when the excavation body is not drenched and weakened in the set observation region is obtained on site, the initial surrounding rock average strength is calculated through the initial surrounding rock strength, the initial surrounding rock average strength is used as data of initial time for fitting according to the corresponding relation, and the weakening condition of the surrounding rock by underground water can be reflected more accurately.
The field acquisition of the initial surrounding rock strength and/or weakened surrounding rock strength of the excavation body at different depths in the observation region comprises the following steps: and drilling at the observation area, and obtaining the corresponding surrounding rock strength at different depths by obtaining the drilling parameters of the drilling machine reflecting the surrounding rock strength in the drilling process. By the mode, the defect of inaccurate test data caused by the limitation of sampling conditions in an indoor test and the defects of easy weathering and the like in rock sample transportation can be avoided.
The method further comprises the following steps: determining a plastic area of the surrounding rock and a corresponding area of the original rock area; calculating the average strength of the weakened surrounding rock comprises calculating the average strength of the weakened surrounding rock of the plastic area and the original rock area respectively. By dividing the plastic zone and the original rock zone and respectively calculating the average surrounding rock weakening level of the plastic zone and the original rock zone, the influence degree of underground water on the weakened surrounding rock can be obtained, and the design of the surrounding rock supporting scheme can be more scientific. It is worth mentioning that the division of the surrounding rock area may further include a transition area between the plastic area and the original rock area. In addition, other methods can be adopted for dividing the plastic zone and the original rock zone, for example, the surrounding rock zone can be divided according to the calculation result of numerical simulation.
Calculating the average strength of the initial surrounding rocks comprises calculating the average strength of the initial surrounding rocks of the plastic zone and the original rock zone respectively; determining the plastic zone of the surrounding rock and the corresponding zone of the original rock zone comprises: dividing the surrounding rock according to a set depth, wherein the area larger than the set depth is an original rock area, and the area smaller than the set depth is a plastic area.
Average strength sigma of plastic zone surrounding rockpIs determined by the following formula:
the average strength of surrounding rocks in the original rock area is as follows:
wherein D is the depth of the surrounding rock at the drill hole, R is the set depth, and Ds is the drill hole depth. By defining the algorithm of the average strength of the surrounding rock, the mechanical data reflecting the stress conditions of the surrounding rock in the plastic region and the original rock region in the observation region can be acquired more scientifically.
Defining a weakening coefficient of the plastic zone surrounding rock:
defining the weakening coefficient of surrounding rocks in the original rock area:
and comparing the weakening coefficient of the surrounding rock in the plastic region or the weakening coefficient of the surrounding rock in the original rock region with the weakening safety coefficient M of the surrounding rock, and determining the dangerous state of the surrounding rock. The weakening condition of the surrounding rock caused by underground water can be quantitatively reflected.
When the weakening coefficient of the surrounding rock in the plastic region or the weakening coefficient of the surrounding rock in the original rock region is equal to the weakening safety coefficient M of the surrounding rock, the average strength of the corresponding weakened surrounding rock is set strength.
A system for rapidly determining the reinforcement time of weakened surrounding rock, the system comprising:
the acquisition unit is configured for acquiring the strength of the weakened surrounding rocks at different depths in the set observation region of the excavation body in different time periods on site;
and the analysis unit is configured to calculate the average intensity of the weakened surrounding rocks at different time intervals, fit the corresponding relation of the average intensity of the weakened surrounding rocks changing along with time, and calculate the corresponding time when the average intensity of the weakened surrounding rocks reaches the set intensity according to the corresponding relation.
An apparatus for rapidly determining a reinforcement time of weakened surrounding rock comprises a processor, a memory and a display; the method is characterized in that:
the memory contains instructions executable by the processor to cause the processor to perform:
acquiring weakened surrounding rock strength data of different depths at a set observation region of an excavation body in different time periods;
calculating the average intensity of the weakened surrounding rocks in different time periods, fitting the corresponding relation of the average intensity of the weakened surrounding rocks changing along with the time, and calculating the corresponding time when the average intensity of the weakened surrounding rocks reaches the set intensity according to the corresponding relation.
According to the scheme for rapidly determining the reinforcement time of the weakened surrounding rock, the strength of the weakened surrounding rock in different time periods is obtained on site, the corresponding relation of the average strength of the weakened surrounding rock changing along with time is fitted, the change condition of the mechanical index of the weakened surrounding rock along with time can be rapidly and directly obtained, and the weakening degree of underground water to the surrounding rock is reflected more truly. The corresponding relation can effectively predict the optimal supporting time of the surrounding rock, replaces the indoor test for carrying out bubble sprinkling treatment on the rock sample to simulate the weakening state of the rock on site, can truly reflect the weakening degree of the surrounding rock by underground water, and is more accurate in research on the weakening characteristic of the rock. In addition, the defect that the time interval from field coring to obtaining of an experimental report is long in a drilling method is overcome, and the optimal supporting time for weakening the surrounding rock can be given quickly and timely.
The weakening concept in the application means that after the surrounding rock of the underground chamber is excavated, the physical and mechanical parameters of the surrounding rock are reduced from the set strength before excavation under the influence of the existing environment, and the weakening is called as weakening. The person skilled in the art can determine the specific set strength in question according to engineering circumstances and clearly understand the meaning of weakening.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
FIG. 1 is a flow chart of a first embodiment of the present application;
FIG. 2 is a schematic diagram of a sigma-t curve method and corresponding data processing according to a second embodiment of the present application;
fig. 3 is a flowchart of operations and data processing according to the second embodiment of the present application.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
It should be noted that, in the present application, features in the embodiments and examples may be combined with each other without conflict, and the specific steps performed may be adjusted according to the circumstances, and are not limited by the specific order in the embodiments. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
Example one
Referring to fig. 1, an embodiment of the present application provides a method for quickly determining a reinforcement time of a weakened surrounding rock, including the following steps:
the method comprises the following steps: the initial surrounding rock intensity of the different degree of depth of excavation body when setting for observation region department not weakening is acquireed on-spot includes: and drilling at the observation area, and obtaining the corresponding surrounding rock strength at different depths by obtaining the drilling parameters of the drilling machine reflecting the surrounding rock strength in the drilling process.
Step two: determining the plastic zone of the surrounding rock and the corresponding zone of the original rock zone comprises: dividing the surrounding rock according to a set depth, wherein the area larger than the set depth is an original rock area, and the area smaller than the set depth is a plastic area.
Step three: respectively calculating the average strength of the initial surrounding rocks of the plastic zone and the original rock zone through the initial surrounding rock strength, and calculating the average strength sigma of the surrounding rocks of the plastic zonepIs determined by the following formula:
the average strength of surrounding rocks in the original rock area is as follows:
wherein D is the depth of the surrounding rock at the drill hole, R is the set depth, and Ds is the drill hole depth.
Step four: acquiring the intensity of weakened surrounding rocks at different depths in a set observation region of the excavated body in different time periods on site, and calculating the average intensity of the weakened surrounding rocks of the plastic region and the original rock region in different time periods; the method of calculating the average intensity of the weakened surrounding rock is the same as the method of calculating the average intensity of the initial surrounding rock.
Step five: and respectively fitting the corresponding relation of the average intensity of the weakened surrounding rocks in the plastic area and the original rock area along with the change of time, wherein the corresponding relation comprises the initial average intensity value of the surrounding rocks corresponding to the moment of not weakening.
Step six: and calculating the time corresponding to the time when the average intensity of the weakening surrounding rock reaches the set intensity. The method comprises the following steps: defining a weakening coefficient of the plastic zone surrounding rock:
defining the weakening coefficient of surrounding rocks in the original rock area:
and when the weakening coefficient of the surrounding rock in the plastic region or the weakening coefficient of the surrounding rock in the original rock region is equal to the weakening safety coefficient M of the surrounding rock, obtaining the corresponding average strength of the weakened surrounding rock, and obtaining the corresponding time under the condition according to the corresponding relation of the average strength of the weakened surrounding rock, which is fitted in the step five, along with the change of time. This time is the time required to reach the safety limit.
In addition, the surrounding rock weakening coefficient of the plastic zone or the surrounding rock weakening coefficient of the original rock zone and the surrounding rock weakening safety coefficient M can be compared, and the dangerous state of the surrounding rock can be determined.
It should be noted that, when calculating the average strength of the surrounding rock or the surrounding rock weakening coefficient, the surrounding rock may not be divided according to the plastic region and the region of the original rock region, for example, when calculating the average strength of the weakened surrounding rock, the surrounding rock weakening coefficient may be an integral of a specific depth, as long as the drilling parameters within the specific depth range can be obtained. By the weakening of the average intensity of the surrounding rock, the corresponding relation of the average intensity of the weakening surrounding rock changing along with time can be fitted, and further the weakening degree of the weakening surrounding rock is determined.
In addition, when the average intensity of the weakened surrounding rock is compared with the average intensity of the initial surrounding rock, the calculation of the average intensity of the surrounding rock is not limited to the specific formula in step three, for example, the average value of the results obtained by calculating the average intensity of the surrounding rock through the specific formula of the observation points may also be used. So long as the calculation method reflects the average intensity, it is within the scope of the present application.
The embodiment of the application also provides a system for rapidly determining weakened surrounding rock reinforcement time, which comprises: an acquisition unit, a host and a corresponding device.
The acquisition unit is configured for acquiring the weakened surrounding rock strength of different depths at the set observation region of the excavation body in different time periods on site, and the acquisition unit can specifically adopt a digital surrounding rock strength drilling measurement system.
The host may be a variety of electronic devices, including but not limited to a personal computer, a smart phone, a tablet computer, and the like, and includes an analysis unit configured to calculate the average intensity of the weakened surrounding rock at different time intervals according to the intensity of the weakened surrounding rock, fit a correspondence relationship of the average intensity of the weakened surrounding rock changing with time, and calculate, according to the correspondence relationship, a time corresponding to when the average intensity of the weakened surrounding rock reaches a set intensity. For details of the analysis, reference is made to the above-mentioned methods, which are not described herein again.
The embodiment of the application also provides equipment for rapidly determining the weakened surrounding rock reinforcement time, which comprises a processor, a memory and a display; the memory contains instructions executable by the processor to cause the processor to perform: acquiring weakened surrounding rock strength data of different depths at a set observation region of an excavation body in different time periods; according to the weakened surrounding rock strength data, calculating weakened surrounding rock average strength in different time periods, fitting a corresponding relation of the weakened surrounding rock average strength changing along with time, and according to the corresponding relation, calculating the corresponding time when the weakened surrounding rock average strength reaches the set strength. For details of the execution content, refer to the above method, and are not described herein again.
Example two
Referring to fig. 2 and fig. 3, a design method for rapid reinforcement of weakened surrounding rock is shown, which comprises using a drilling machine and a digital surrounding rock strength drilling measurement system, in order to eliminate the influence of the drilling characteristics of different drilling machines on the drilling machine parameters, the invention uniformly adopts a full hydraulic impact rotary drilling machine, adopts a high-pressure gas deslagging mode, and adopts a drilling diameter of 50-100 mm.
The method comprises the following specific steps:
in order to realize the purpose, the invention adopts the following technical scheme:
a. firstly, excavating surrounding rocks of the chamber, setting an observation point in the chamber so as to observe the subsequent water spraying state of the surrounding rocks of the top plate and the side part, surveying the surrounding rocks and analyzing the water spraying state to obtain sections with approximately same characters, and selecting a drilling point at a certain distance.
b. After a drilling point is selected, because the chamber is just excavated at the moment, the chamber does not start to be drenched and weakened, a digital surrounding rock strength drilling measuring system is immediately utilized to carry out a first drilling test on surrounding rocks, the digital surrounding rock strength drilling measuring system can refer to the patent number ZL201510154334.9, a laser range finder arranged on a drilling machine is used for recording the drilling depth, parameters such as axial pressure, torque, rotating speed, drilling rate and drilling specific work in the drilling process are measured through a bit pressure sensor, a torque sensor, a rotating speed sensor and the like arranged on a drill bit, and the parameters are compared with a database with the relation between each parameter and rock strength to obtain the surrounding rock strength of rock layers at different depths. And drawing a curve of the surrounding rock strength sigma changing along with the depth D when the surrounding rock is not diluted by water by using the obtained data, namely a sigma-D curve method.
c. Obtaining a plastic zone radius R of surrounding rock through numerical simulation and early-stage rock mechanical test, dividing the surrounding rock into a plastic zone and a proto-rock zone according to the depth, respectively drawing a sigma-D curve of the plastic zone and a sigma-D curve of the proto-rock zone according to the sigma-D curve obtained in the last step, and defining the average strength sigma-D of the surrounding rock of the plastic zone by using an integral median methodpIs composed of
And the average intensity sigma of surrounding rocks in the original rock arearIs composed of
The average strength of the plastic zone in the un-weakened state is sigma-delta curve obtained by the method of sigma-delta curve when the previous step is un-weakenedp0And the average intensity of surrounding rock in the original rock area is sigmar0。
d. Observing the observation point of the surrounding rock of the chamber in the first step, recording the time when the water spraying phenomenon of the surrounding rock of the chamber is observed, recording the time as 0, continuously observing the observation point, and entering the water spraying state t of the surrounding rock1，t2，t3，…，tnAfter the time, a drilling test is carried out on the surrounding rock by utilizing a digital surrounding rock strength drilling measuring system to obtain t1，t2，t3，…，tnA sigma-D curve under time is used for calculating by the method in the third step, and the average intensity sigma of the surrounding rock in the plastic zone is respectively obtainedp1，σp2，σp3，…，σpnAnd the average intensity sigma of surrounding rocks in the original rock arear1，σr2，σr3，…，σrn。
e. Weakening time t by the different water spraysnAverage strength sigma of plastic zone of surrounding rock under conditionpnAverage intensity sigma of original rock zonernPlotting average intensity sigma of all parts of surrounding rock along with timeAnd the sigma-t curve of the t change can visually reflect the weakening influence of water on the surrounding rock and reflect the different influence difference of the water on the plastic area of the surrounding rock and the original rock area, namely a sigma-t curve method.
f. According to the obtained sigma-t curve, selecting t after the surrounding rock enters a water spraying statenAverage strength of plastic region at time σpnAverage strength sigma of plastic zone without water spraying weakeningp0Calculating and defining the weakening coefficient of the surrounding rock in the plastic region
Similarly, the surrounding rock weakening coefficient of the original rock zone can be defined
The surrounding rock weakening coefficient of the plastic zone and the original rock zone can well reflect the change relation of the surrounding rock weakening degree along with time in the water spraying state of the surrounding rock, and the coefficient is compared with the surrounding rock weakening safety coefficient M, such as the weakening coefficient SpAnd SrAnd if the safety coefficient is larger than the safety coefficient M, the surrounding rock is in a dangerous state and needs to be reinforced, otherwise, the observation is continued. The weakening degree of the surrounding rock can be determined through the coefficient definition, so that the surrounding rock is reinforced in a targeted manner.
g. Selecting the plastic zone average strength sigma at the tn time after the surrounding rock enters the water spraying state according to the obtained sigma-t curvepnAverage intensity sigma of original rock zonernAverage strength sigma of plastic zone when not drenchedp0And the average intensity of surrounding rock in the original rock area is sigmar0Calculating to obtain the weakening difference rate delta between the plastic area and the original rock area
The method for calculating the weakening difference rate of the plastic zone and the original rock zone can visually represent different weakening characteristics of the plastic zone and the original rock zone at the same surrounding rock position in the same water spraying state, and a corresponding support form and a corresponding reinforcing range are determined according to the difference of the weakening characteristics.
h. Respectively establishing a plastic region and a native region sigma-f (t) function according to sigma-t curves of all parts of the surrounding rock strength under different water spraying weakening time drawn in the fifth step, and calculating corresponding inverse functions through function operation
Intensity sigma when the inverse function, the plastic zone and the original rock zone are used for achieving the safety limit of surrounding rock weakeningp0(1-M) and σr0(1-M), the time required for reaching the safety limit can be obtained by substituting the safety limit strength into an inverse function, and the time can be used for guiding the field construction schedule, so that the field chamber is ensured to be in a safe state.
The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by those skilled in the art that the scope of the invention herein disclosed is not limited to the particular combination of features described above, but also encompasses other arrangements formed by any combination of the above features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Claims (7)
1. The method for determining the reinforcing time of the weakened surrounding rock of the underground engineering is characterized by comprising the following steps of:
acquiring the surrounding rock strength of different depths at a set observation region of an excavation body in different time periods on site, and calculating the average surrounding rock strength of the different time periods;
fitting the corresponding relation of the average intensity of the surrounding rock along with the change of time;
calculating the corresponding time when the average intensity of the surrounding rock is weakened to the set intensity according to the corresponding relation;
wherein, the method also comprises:
the method comprises the steps of obtaining initial surrounding rock strength of different depths of an excavated body when the excavated body is not weakened at a set observation region on site, calculating initial surrounding rock average strength according to the initial surrounding rock strength, and fitting the initial surrounding rock average strength serving as data of initial time according to the corresponding relation;
determining a plastic area of the surrounding rock and a corresponding area of the original rock area; calculating the average strength of the weakened surrounding rocks comprises calculating the average strength of the weakened surrounding rocks of the plastic zone and the original rock zone respectively;
the calculating of the average strength of the initial surrounding rocks comprises calculating the average strength of the initial surrounding rocks of the plastic zone and the original rock zone respectively; the determining of the plastic zone of the surrounding rock and the corresponding zone of the original rock zone comprises the following steps: dividing the surrounding rock according to a set depth, wherein a region larger than the set depth is an original rock region, and a region smaller than the set depth is a plastic region;
the average strength sigma of the plastic zone surrounding rockpIs determined by the following formula:
the average strength of the surrounding rocks of the original rock area is as follows:
wherein D is the depth of the surrounding rock at the drill hole, R is the set depth, and Ds is the drill hole depth.
2. The underground engineering weakened surrounding rock reinforcement opportunity determination method according to claim 1, wherein the on-site obtaining of the initial surrounding rock strength and/or the weakened surrounding rock strength of the excavated body at different depths in the observation region comprises: and drilling at the observation area, and obtaining the surrounding rock strength corresponding to different depths by obtaining drilling parameters of the drilling machine reflecting the surrounding rock strength in the drilling process.
3. The method for determining the reinforcing time of the weakened surrounding rock of the underground engineering is characterized by comprising the following steps of:
acquiring the surrounding rock strength of different depths at a set observation region of an excavation body in different time periods on site, and calculating the average surrounding rock strength of the different time periods;
fitting the corresponding relation of the average intensity of the surrounding rock along with the change of time;
calculating the corresponding time when the average intensity of the surrounding rock is weakened to the set intensity according to the corresponding relation;
wherein, the method also comprises:
the method comprises the steps of obtaining initial surrounding rock strength of different depths of an excavated body when the excavated body is not weakened at a set observation region on site, calculating initial surrounding rock average strength according to the initial surrounding rock strength, and fitting the initial surrounding rock average strength serving as data of initial time according to the corresponding relation;
determining a plastic area of the surrounding rock and a corresponding area of the original rock area; calculating the average strength of the weakened surrounding rocks comprises calculating the average strength of the weakened surrounding rocks of the plastic zone and the original rock zone respectively;
the calculating of the average strength of the initial surrounding rocks comprises calculating the average strength of the initial surrounding rocks of the plastic zone and the original rock zone respectively; the determining of the plastic zone of the surrounding rock and the corresponding zone of the original rock zone comprises the following steps: dividing the surrounding rock according to a set depth, wherein a region larger than the set depth is an original rock region, and a region smaller than the set depth is a plastic region;
wherein, defining a weakening coefficient of the plastic zone surrounding rock:
defining the weakening coefficient of surrounding rocks in the original rock area:
comparing the weakening coefficient of the surrounding rock in the plastic zone or the weakening coefficient of the surrounding rock in the original rock zone with the weakening safety coefficient M of the surrounding rock, and determining the dangerous state of the surrounding rock;
wherein the content of the first and second substances,
σp0the average strength of the plastic zone in an un-weakened state;
σpnfor different weakening times tnAverage strength of a plastic zone of the surrounding rock under the condition;
σr0the average strength of surrounding rocks in the original rock area is obtained;
σrnfor different weakening times tnAverage strength of the original rock zone under the condition.
4. The underground engineering weakened surrounding rock reinforcement opportunity determination method according to claim 3, wherein the on-site obtaining of the initial surrounding rock strength and/or the weakened surrounding rock strength of the excavated body at different depths in the observation region comprises: and drilling at the observation area, and obtaining the surrounding rock strength corresponding to different depths by obtaining drilling parameters of the drilling machine reflecting the surrounding rock strength in the drilling process.
5. The underground engineering weakened surrounding rock reinforcement opportunity determination method according to claim 3, wherein when the plastic region surrounding rock weakening coefficient or the original rock region surrounding rock weakening coefficient is equal to a surrounding rock weakening safety coefficient M, the corresponding weakened surrounding rock average strength is the set strength.
6. The system for determining the reinforcing time of the underground engineering weakened surrounding rock according to the claim 1 or 3, is characterized in that the system comprises:
the acquisition unit is configured for acquiring the strength of the weakened surrounding rocks at different depths in the set observation region of the excavation body in different time periods on site;
and the analysis unit is configured to calculate the average intensity of the weakened surrounding rocks in different time periods according to the intensity of the weakened surrounding rocks, fit a corresponding relation of the average intensity of the weakened surrounding rocks changing along with time, and calculate the corresponding time when the average intensity of the weakened surrounding rocks reaches a set intensity according to the corresponding relation.
7. The determination device of the underground engineering weakened surrounding rock reinforcement opportunity determination method according to claim 1 or 3, comprising a processor, a memory and a display; the method is characterized in that:
the memory includes instructions executable by the processor to cause the processor to perform:
acquiring weakened surrounding rock strength data of different depths at a set observation region of an excavation body in different time periods;
according to the weakened surrounding rock strength data, calculating the weakened surrounding rock average strength in different time periods, fitting the corresponding relation of the weakened surrounding rock average strength changing along with time, and according to the corresponding relation, calculating the corresponding time when the weakened surrounding rock average strength reaches the set strength.
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