CN112417367B - Multi-parameter coupling quantitative evaluation method for interlayer grouting reinforcement effect in superposed line tunnel - Google Patents
Multi-parameter coupling quantitative evaluation method for interlayer grouting reinforcement effect in superposed line tunnel Download PDFInfo
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Abstract
The invention relates to a multi-parameter coupling quantitative evaluation method for interlayer grouting reinforcement effect in a superposed tunnel, which comprises the following steps of 1) constructing a grouting effect evaluation index multi-parameter coupling coefficient xi according to a grouting model and a plurality of physical parameters of grouting effect evaluation, and 2) determining an optimal value xi of the multi-parameter coupling coefficient according to actual working conditions*And step 3) determining xi to xi*A threshold interval of the proximity n, and step 4) calculating a multi-parameter coupling coefficient xi according to physical parameters obtained from monitoring points of the grouting model, and preliminarily evaluating the grouting effect through the threshold interval of the proximity n; and obtaining final grouting effect evaluation through the evidence based on the frequency spectrum characteristics of the ultrasonic pulse receiving end. The method has the advantages that grouting parameters which can be simply recorded during grouting and can reflect field conditions are combined, a multi-parameter coupling objective quantitative calculation method is constructed through dimensional analysis, ultrasonic monitoring result feedback verification is assisted, and finally a grouting effect evaluation conclusion is obtained and optimization suggestions are given.
Description
Technical Field
The invention relates to the technical field of grouting effect grade evaluation methods, in particular to a multi-parameter coupling quantitative evaluation method for interlayer grouting reinforcement effect in a superposed line tunnel.
Background
At present, the grouting technology in modern underground engineering is mature, but the research on the aspect of grouting effect evaluation is insufficient, most grouting effect evaluation methods are fuzzy judgment methods which have the problem that the detection carries artificial subjective evaluation results, and an effective grouting evaluation method combining nondestructive detection and quantitative objective evaluation cannot be found for the detection working conditions such as shield tunneling technology which are not easy to sample and have high protection requirements on a grouting area.
A series of methods for applying nondestructive testing to grouting effect evaluation at the present stage have more or less defects, and objective evaluation on the grouting effect cannot be accurately and effectively performed.
For example, in a P-Q-t evaluation method for evaluating grouting process parameters such as grouting pressure, grouting amount and grouting time during grouting, the influence of changes of original components such as equipment and grout and raw materials on the result is large, and curve characteristics output in uneven media such as fault fracture zones may show abnormal trends, so that evaluation cannot be performed and universality is not available; similar technologies such as grouting amount distribution characteristic method, slip casting circle scope detect, need to beat the peephole of establishing a large amount of great depths, and this operation is inconvenient when detecting top position slip casting effect, and is more time-consuming and energy-consuming, has the loss slip casting district, and can't direct description reinforce, water shutoff quality, so should not promote on a large scale.
The drilling sampling and water analysis technologies represented by an RMR evaluation method, a rotary penetration sounding method, a mechanical parameter comparison method, a drilling coring rate method, a (pumped) water pressure test method, a permeability coefficient method, water stability analysis, a digital drilling photography method and the like not only damage a grouting body, but also have the advantages of old technology, single evaluation parameter, no multi-parameter evaluation system, no clear evaluation standard, possible detection blind spots during monitoring and contingency.
Disclosure of Invention
The invention mainly aims to overcome the defects of the prior art and provides a multiparameter coupling quantitative evaluation method for the grouting reinforcement effect of an interlayer in a superposed line tunnel.
In order to achieve the purpose, the invention adopts the following technical scheme:
the multiparameter coupling quantitative evaluation method for the interlayer grouting reinforcement effect in the superposed line tunnel comprises the following steps of:
step 1) constructing a key formula of a slip casting effect evaluation index multi-parameter coupling coefficient xi according to a slip casting model and a plurality of physical parameters of slip casting effect evaluation,
wherein P is the maximum grouting pressure design value of the surrounding rock, Deltaf is the central frequency difference value of the ultrasonic pulse exciter and the receiver, and DeltaVpThe first phase wave velocity of the ultrasonic receiving end is VpWith the first phase wave speed detected in the test section
Delta E is the energy difference per cubic meter of the pulse of the ultrasonic pulse transmitting end and the receiving end;
step 2) determining the optimal value xi of the multi-parameter coupling coefficient according to the actual working condition*Selecting 2-3 m sections in a grouting construction section area for grouting test, applying the traditional monitoring and evaluating means to ensure that the grouting effect achieves the best effect, applying ultrasonic detection equipment to detect the grouting effect, and calculating the optimal value xi of the multi-parameter coupling coefficient through a formula (1)*；
Step 3) determining xi vs xi*A threshold interval of proximity n to the threshold interval,
n＝(ξ*-ξ)/ξ* (2)
wherein n belongs to (0, 0.3), n is (0, 0.1) with good grouting effect, n is (0.1, 0.2) with general grouting effect, and n is (0.2, 0.3) with poor grouting effect;
step 4) calculating a multi-parameter coupling coefficient xi according to physical parameters obtained from monitoring points of the grouting model, and preliminarily evaluating the grouting effect through a formula 2; and obtaining final grouting effect evaluation through the evidence based on the frequency spectrum characteristics of the ultrasonic pulse receiving end.
Preferably, the grouting model in the step 1) selects the intersection point of the quadrilateral diagonals surrounded by the nearest four adjacent grouting holes for detection, and the thickness of the evaluated grouting area is not more than 5 m.
Preferably, the optimal value xi of the multi-parameter coupling coefficient in the step 2)*And continuously feeding back the slurry to the optimal slurry injection effect through the feedback optimization circulation.
Preferably, the final evaluation of the grouting effect in the step 4) is assisted and verified by the waveform distortion condition of the ultrasonic receiving end, if the initial evaluation effect is larger than the initial evaluation effect in the formula 2, the external factors of the interference are analyzed, and the evaluation effect is calculated again after the interference factors are processed until the evaluation effect is consistent.
Preferably, dimension analysis is carried out on the multi-parameter coupling coefficient xi in the step 1), and when xi is constant under the maximum design pressure P of the surrounding rock, when the difference delta E of the energy of the ultrasonic pulse impulse sending end and the receiving end is smaller, the first phase wave speed of the ultrasonic receiving end is VpWith the first phase wave speed detected in the test section
Difference value DeltaVpThe smaller the frequency variation Δ f between the transmitting end and the receiving end of the ultrasonic pulse impulse, and vice versa.
The invention has the following beneficial effects:
(1) the multi-parameter coupling quantitative evaluation method for the grouting reinforcement effect of the interlayer in the multi-parameter coupling multi-line tunnel is provided with an evaluation index xi for the grouting effect of the interlayer in the multi-parameter coupling multi-line tunnel, wherein the index is dimensionless and can effectively eliminate artificial subjective factors; the quantifiability and the objectivity of the evaluation index are achieved;
(2) the multiparameter coupling quantitative evaluation method for the interlayer grouting reinforcement effect in the superposed tunnel comprises the following steps of evaluating the optimal value xi of a multiparameter coupling coefficient*The method breaks through the traditional method of trying to determine a universal and unchangeable calculation index or industry standard in complex geotechnical engineeringThe concept is limited, so that the establishment of the index can fully consider the project actual condition and the symptomatic medicine administration, the calculation result is more real and reliable, the practical situation is more met, and the reliability is higher.
(3) According to the multi-parameter coupling quantitative evaluation method for the interlayer grouting reinforcement effect in the superposed tunnel, an evaluation quantitative interval matched with the calculation of the multi-parameter coupling coefficient xi is constructed, the primary grouting effect can be simply and visually judged, and the threshold interval plays an important role in continuously judging the grouting degree, continuously feeding back and supervising and prompting the optimization of the grouting quality in a subsequent feedback grouting evaluation system.
Drawings
FIG. 1 is a schematic view of an evaluation flow of the present invention;
FIG. 2 is a schematic illustration of a slip casting demould according to the invention;
FIG. 3 is a graphical representation of the spectral characteristics of the processed ultrasound waves of the present invention.
Wherein the figures include the following reference numerals: 1. a shield segment; 2. a grouting area; 31-36, ultrasonic pulse excitation end points; 41-43, an ultrasonic pulse receiving end; 5. an ultrasonic propagation schematic line; 9. the sound wave amplitude loss delta A of the ultrasonic transmitting end and the receiving end; 10. the acoustic frequency loss delta f of the ultrasonic transmitting end and the receiving end; 11. the wave form distortion phenomenon of the sound wave of the receiving end is the sound wave of the ultrasonic transmitting end after the sound wave frequency of the ultrasonic transmitting end is compared with that of the receiving end.
Detailed Description
The invention will be further explained with reference to the drawings.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1-3, the multiparameter coupling quantitative evaluation method for the interlayer grouting reinforcement effect in the laminated line tunnel according to the embodiment includes the following steps,
step 1) constructing a key formula of a slip casting effect evaluation index multi-parameter coupling coefficient xi according to a slip casting model and a plurality of physical parameters of slip casting effect evaluation,
wherein P is the maximum grouting pressure design value of the surrounding rock, Deltaf is the central frequency difference value of the ultrasonic pulse exciter and the receiver, and DeltaVpThe first phase wave velocity of the ultrasonic receiving end is VpWith the first phase wave speed detected in the test section
Delta E is the energy difference per cubic meter of the pulse of the ultrasonic pulse transmitting end and the receiving end; the parameter dimension in equation 1 is shown in table 1.
TABLE 1 grouting parameter dimension formula
Wherein L represents a length dimension, M represents a quality dimension, and T represents a time dimension.
Carrying out dimensional analysis on the multi-parameter coupling coefficient xi:
according to the ultrasonic transmission detection principle, the pulse data processing result of an ultrasonic receiving end is comprehensively utilized, and a relational expression of the slip casting effect evaluation multi-parameter coupling coefficient xi is constructed.
According to the above:
F(Δf,ΔVp,P,ΔE)＝0
the exponential product of the formula is:
the dimension formula is as follows:
namely, the method comprises the following steps:
L2MT-2＝(T-1)a(LT-1)b(ML-1T-2)c
and (3) solving a dimension index according to a dimension harmony principle:
L:b-c＝2
M:c＝1
T:a+b+2c＝2
obtaining by solution:
finishing the equation:
namely:
by analyzing the formula, the following basic relationship can be obtained:
when xi is constant under the optimal design pressure P of the surrounding rock, when the difference value (energy loss) Delta E of the energy of the ultrasonic pulse impulse sending end and the receiving end is smaller, the first phase wave speed of the ultrasonic receiving end is VpWith the first phase wave speed detected in the test section
Difference value DeltaVpThe smaller the frequency variation Δ f between the transmitting end and the receiving end of the ultrasonic pulse impulse, and vice versa. Through analysis, the change of the multi-parameter coupling coefficient caused by the change of each parameter has no conflict and accords with the actual situation.
Step 2) determining the optimal value xi of the multi-parameter coupling coefficient according to the actual working condition*(ii) a Only the actually calculated xi value needs to be compared with xi*And comparing to perform quantitative evaluation on the subsequent grouting effect. Wherein the optimal value xi of the multi-parameter coupling coefficient*The acquisition concept and method are as follows: firstly, selecting 2-3 m sections in a grouting construction section area (if stratum conditions are not changed greatly, a neighboring area can be selected) to perform a grouting test, ensuring that the grouting effect achieves the best effect by applying a traditional monitoring and evaluating means, then detecting the grouting effect by using ultrasonic detection equipment to obtain the calculation parameters, and then substituting the parameters obtained under the condition of the best grouting effect into a formula (1) to calculate the optimal value xi of the multi-parameter coupling coefficient*In the later stage, a large amount of instruments and equipment and other methods are not needed, and xi can be referred to for quantitative evaluation work of grouting effect in the adjacent engineering section*Obtaining; the parameter can not be a constant determined value, and is determined according to the actual situation of the construction site, and the specific working condition is specifically analyzed.
Step 3) determining xi vs xi*A threshold interval of proximity n to the threshold interval,
n＝(ξ*-ξ)/ξ* (2)
wherein n belongs to (0, 0.3), n is (0, 0.1) with good grouting effect, n is (0.1, 0.2) with general grouting effect, and n is (0.2, 0.3) with poor grouting effect, as detailed in Table 2.
TABLE 2 xi vs xi*Threshold interval of proximity n
The grouting evaluation is a feedback optimization cycle process, so that the grouting can be continuously fed back to xi*And the optimal grouting effect of the stratum is achieved.
Step 4) calculating a multi-parameter coupling coefficient xi according to physical parameters obtained from monitoring points of the grouting model, and preliminarily evaluating the grouting effect through a formula 2; and obtaining final grouting effect evaluation through the evidence based on the frequency spectrum characteristics of the ultrasonic pulse receiving end.
As shown in fig. 2, the grouting pipe of the grouting model is generally a prefabricated steel pipe, the wall of the grouting pipe is thin, the thickness of the grouting pipe is small relative to the wavelength of the ultrasonic wave, the grouting pipe is basically located in an environment where the grout on the two sides are adjacent when grouting is stopped, when ultrasonic detection is performed by using an ultrasonic exciter, the grouting pipe shows high acoustic impedance, the grouting grout on the two sides shows low acoustic impedance, the ultrasonic wave can easily penetrate through the grouting pipe to propagate, that is, the grouting pipe has little influence on grouting effect detection. In addition, in order to fully detect the weak grouting part, a quadrilateral diagonal intersection point part surrounded by four adjacent and nearest grouting holes is selected for detection; in order to ensure the accurate detection result, the thickness h of the evaluated grouting area should be controlled to be not more than 5 m.
The examples demonstrate the above theory.
The ultrasonic pulse impulse transmitting end adopts the center frequency f1Center frequency f of ultrasonic pulse receiving end2The first phase wave velocity of the ultrasonic receiving end is VpWith the first phase wave speed detected in the test section
The energy per cubic meter of the ultrasonic pulse impulse sending end is E1Energy per cubic meter at ultrasonic pulse receiving end E2The designed grouting pressure value is P. By way of example, assume that the multiparameter coupling coefficient ξ of the test segment*And 5, the obtained experimental points are shown in the attached figure 2, 6 monitoring points are selected, an ultrasonic pulse exciter is arranged at each monitoring point, and the ultrasonic pulse receiving ends are not all displayed due to the problem of visual angles. .
TABLE 3 calculation examples (the parameter dimensions are the international standard dimension)
The grouting effect of the point 3 is 'better', the grouting effect of the point 4 is 'worse', the grouting is needed to be supplemented, the parameters of the ultrasonic pulse at the receiving end are read after the grouting is supplemented, the calculation is continued, the steps are repeated until the comment is 'better', the points 1 and 2 are calculated as 'normal', and the grouting is needed to be supplemented according to the situation. If large fractured strata such as karst caves occur, other measures are needed to be taken for plugging, and then the grouting evaluation process is carried out.
The final conclusion of the grouting effect of each point needs to be verified in an auxiliary mode through the waveform distortion condition of the ultrasonic receiving end, the grouting effect can be defined as good after the final conclusion is consistent with the preliminary judgment conclusion in the table 2, if the two conclusions are judged to have larger access, instruments and equipment need to be fully checked, external factors which possibly generate interference are analyzed one by one, the two judgments are consistent after the interference factors are processed and grouting is carried out repeatedly, and finally the grouting effect is evaluated through the conclusion. The ultrasonic spectrum change characteristics used for the auxiliary judgment are exemplified in fig. 3.
In fig. 3, a and c indicated by solid lines each indicate a curve including normal grouting detection, and curves b and d are dotted lines observed under the condition of grouting defect, and are used for comparison with the normal curve, and the comparison result is used as the conclusion of the judgment of the calculated parameters for auxiliary verification. To more clearly show the three possible cases of defect-to-normal variation: the ultrasonic wave transmitting end and receiving end sound wave amplitude loss delta A9, the ultrasonic wave transmitting end and receiving end sound wave frequency loss delta f10 and the receiving end sound wave waveform distortion phenomenon 11 after the ultrasonic wave transmitting end and receiving end sound wave frequency are compared are separately shown by two graphs, and the difference of the two graphs is that the shapes of pulse curves are different. The position enclosed by the dotted square frame, namely the receiving end sound wave waveform distortion phenomenon 11 after the ultrasonic wave transmitting end and the receiving end sound wave frequency are compared, can obviously know that the curve with the defects is different from the normal curve above, and lacks two larger amplitude wave crests.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A multiparameter coupling quantitative evaluation method for interlayer grouting reinforcement effect in a superposed line tunnel is characterized by comprising the following steps of,
step 1) constructing a key formula of a slip casting effect evaluation index multi-parameter coupling coefficient xi according to a slip casting model and a plurality of physical parameters of slip casting effect evaluation,
wherein P is the maximum grouting pressure design value of the surrounding rock, Deltaf is the central frequency difference value of the ultrasonic pulse exciter and the receiver, and DeltaVpThe first phase wave velocity of the ultrasonic receiving end is VpWith the first phase wave speed detected in the test section
Delta E is the energy difference per cubic meter of the pulse of the ultrasonic pulse transmitting end and the receiving end;
step 2) determining the optimal value xi of the multi-parameter coupling coefficient according to the actual working condition*Selecting 2-3 m sections in a grouting construction section area for grouting test, applying the traditional monitoring and evaluating means to ensure that the grouting effect achieves the best effect, applying ultrasonic detection equipment to detect the grouting effect, and calculating the optimal value xi of the multi-parameter coupling coefficient through a formula (1)*；
Step 3) determining xi vs xi*A threshold interval of proximity n to the threshold interval,
n＝(ξ*-ξ)/ξ* (2)
wherein n belongs to (0, 0.3), n is (0, 0.1) with good grouting effect, n is (0.1, 0.2) with general grouting effect, and n is (0.2, 0.3) with poor grouting effect;
step 4) calculating a multi-parameter coupling coefficient xi according to physical parameters obtained from monitoring points of the grouting model, and preliminarily evaluating the grouting effect through a formula 2; and obtaining final grouting effect evaluation through the evidence based on the frequency spectrum characteristics of the ultrasonic pulse receiving end.
2. The multiparameter coupling quantitative evaluation method for the grouting reinforcement effect of the interlayer in the superimposed tunnel according to claim 1, wherein the grouting model in the step 1) selects the intersection point of the diagonals of a quadrangle surrounded by four adjacent and nearest grouting holes for detection, and the thickness of the grouting area to be evaluated is not more than 5 m.
3. The multiparameter coupling quantitative evaluation method for interlayer grouting reinforcement effect in a superimposed tunnel according to claim 1, wherein in step 2), the optimal value ξ of multiparameter coupling coefficient is*And continuously feeding back the slurry to the optimal slurry injection effect through the feedback optimization circulation.
4. The multiparameter coupling quantitative evaluation method for the grouting reinforcement effect of the interlayer in the laminated tunnel according to claim 1, wherein the final grouting effect evaluation in the step 4) is assisted and verified by the waveform distortion condition of an ultrasonic receiving end, if the effect is larger than the primary evaluation effect of the formula 2, the interfering external factors are analyzed, the interfering factors are processed and grouting is performed, and then calculation is performed again until the evaluation effects are consistent.
5. The multiparameter coupling quantitative evaluation method for interlayer grouting reinforcement effect in a superimposed tunnel according to claim 1, characterized in that dimension analysis is performed on the multiparameter coupling coefficient xi in step 1) to obtain that when xi is constant under the maximum design pressure P of surrounding rock, when the difference delta E between the energy of an ultrasonic pulse impulse sending end and the energy of a receiving end is smaller, the first phase wave speed of the ultrasonic receiving end is VpWith the first phase wave speed detected in the test section
Difference value DeltaVpThe smaller the frequency variation Δ f between the transmitting end and the receiving end of the ultrasonic pulse impulse, and vice versa.
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| CN112417367A (en) | 2021-02-26 |
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