CN102495430B - Method for detecting integrity of rock mass of deep-buried tunnel - Google Patents
Method for detecting integrity of rock mass of deep-buried tunnel Download PDFInfo
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- CN102495430B CN102495430B CN 201110429924 CN201110429924A CN102495430B CN 102495430 B CN102495430 B CN 102495430B CN 201110429924 CN201110429924 CN 201110429924 CN 201110429924 A CN201110429924 A CN 201110429924A CN 102495430 B CN102495430 B CN 102495430B
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Abstract
The invention discloses a method for detecting the integrity of a rock mass of a deep-buried tunnel. The method comprises the following steps of: (1) obtaining a high-frequency magneto-telluric field signal of an earth surface to be detected; (2) carrying out pre-processing on the high-frequency magneto-telluric field signal to obtain a high-frequency magneto-telluric resistivity curve; (3) revising the high-frequency magneto-telluric resistivity curve and obtaining a real resistivity of the rock mass according to the revised high-frequency magneto-telluric resistivity curve; and (4) calculating an integrity coefficient of the rock mass according to the real resistivity of the rock mass. The method for detecting the integrity of the rock mass of the deep-buried tunnel, disclosed by the invention, has the advantages of wide applicable range, high accuracy and high safety.
Description
Technical field
The present invention relates to the geology detecting field of deep tunnel, relate in particular to a kind of detection method of deep tunnel rock mass integrality.
Background technology
In railway, highway and hydraulic engineering construction, run into Tunnel Engineering through regular meeting; for the quality that improves Tunnel Engineering, the security that guarantees tunnel construction; in the Tunnel Design stage; at first to reconnoitre the tunnel surrounding rock mass; to obtain the basic physical mechanics data of Rock Mass; as the tectonic structure of rock mass and physico-mechanical properties etc., thereby provide foundation for accurately dividing the rock mass rank and estimating rock-mass quality, and then provide safe assurance and scientific basis for constructing tunnel.Wherein, the integrality of rock mass is to estimate the critical data of tunnel surrounding rock-mass quality.
At present, the method for determining the integrality of tunnel surrounding rock mass mainly is to adopt the method for elastic wave exploration.The elastic wave method of exploration is after running into reflecting interface by the elastic wave that the artificial excitation produces in the underground propagation process, passes earthward and reflex to by the wave detector reception that ground is buried underground the elastic wave signal on ground again.After the conversion of digital signal, the maintenance data disposal route is carried out necessary processing to seismic event to the elastic wave signal that wave detector receives again through simulating signal, forms seismic section.Then, understand information such as tectonic structure at seismic section, perhaps further use inversion method that the seismic event data message is carried out inverting, obtain and the closer elastic parameter of subsurface geology, physical parameter etc. data.
Yet, on the one hand, be the speed of little basal surface in the following basement rock in the face of land owing to what obtain by the elastic wave exploration, thereby the investigation depth of elastic wave method of exploration is limited, thereby, can not be used for the exploration to deep tunnel.On the other hand, because the focus that the elastic wave detection method adopts is inflammable explosive article, thereby near the tunnel contiguous city, the village can't adopt the elastic wave detection method.And forest fire takes place in inflammable explosive article easily, thereby, cause safety problem.
Therefore, be necessary to provide a kind of detection method of deep tunnel rock mass integrality to overcome above-mentioned defective.
Summary of the invention
The detection method that the purpose of this invention is to provide a kind of applied widely, deep tunnel rock mass integrality that accuracy is high and safe.
To achieve these goals, the invention provides a kind of detection method of deep tunnel rock mass integrality, comprise the steps: that (1) obtains the high frequency mt field signal on the face of land to be measured; (2) described high frequency mt field signal is carried out pre-service and obtain high frequency mt resistivity curve; (3) by the mode of deep tunnel boring is carried out the resistivity logging experiment, obtain the well logging resistivity curve of the different depth of boring, carry out superimposed contrast by will log well resistivity curve and described high frequency mt resistivity curve of curvilinear translation, appoint and get congruent points, calculate the difference of congruent points on two curves, proofread and correct described high frequency mt resistivity curve according to described difference, and the weighted mean value that is positioned near the multiple spot the edpth of tunnel absolute altitude on the described high frequency mt resistivity curve behind the calculation correction obtains the rock mass true resistivity; (4) according to formula
Calculate the rock mass integrity factor, wherein, K
RBe rock mass integrity factor, ρ
rBe rock resistivity, ρ
MassBe described rock mass true resistivity, ρ
wBe weak resistivity of media in the rock mass, and
Particularly, described step (1) is: the high frequency mt field signal of measuring the face of land to be measured by high frequency telluric electromagnetic sounding instrument.
Particularly, described high frequency mt field signal is time series signal.
Particularly, in the described step (2) described high frequency mt field signal being carried out pre-service comprises: noise compacting, data screening, static shift correction, topographic correction, resolution coupling and data inversion.
Compared with prior art, on the one hand, detection method of the present invention is to adopt the high frequency magnetotelluric method to obtain high frequency mt field signal, and the high frequency mt field signal that obtains carried out pre-service and correction, thereby obtain the rock mass true resistivity near true formation resistivity, thereby, more accurate by the rock mass integrity factor that the rock mass true resistivity calculates, thereby, feasible country rock rank and other goodness of fit height of construction in later period level of dividing according to the rock mass integrity factor, and then, can improve the degree of accuracy of Tunnel Design stage budget and improve the accuracy of Tunnel Design.On the other hand, what detection method of the present invention adopted is the high frequency magnetotelluric method, thereby detection method investigation depth of the present invention is big, can be used for the exploration to deep tunnel.And the high frequency magnetotelluric method is to utilize natural electromagnetic field as field source, thereby, safe and applied widely.
By following description also by reference to the accompanying drawings, it is more clear that the present invention will become, and these accompanying drawings are used for explaining embodiments of the invention.
Description of drawings
Fig. 1 is the process flow diagram of the detection method of deep tunnel rock mass integrality of the present invention.
Fig. 2 is for when constructing to the Youxi deep tunnel, the country rock rank that the rock mass integrity factor that obtains according to detection method of the present invention is divided and other comparison diagram of country rock level of construction in later period.
Fig. 3 is when connecting the booth deep tunnel and construct, the country rock rank that the rock mass integrity factor that obtains according to detection method of the present invention is divided and other comparison diagram of country rock level of construction in later period.
Embodiment
With reference now to accompanying drawing, describe embodiments of the invention, the similar elements label represents similar elements in the accompanying drawing.
As shown in Figure 1, the detection method of present embodiment deep tunnel rock mass integrality comprises the steps:
Step S1 measures the high frequency mt field signal on the face of land to be measured by high frequency telluric electromagnetic sounding instrument;
Step S2 carries out noise compacting, data screening, static shift correction, topographic correction, resolution coupling and data inversion to described high frequency mt field signal and obtains rock mass resistivity;
Step S3 by the mode of deep tunnel boring is carried out the resistivity logging experiment, obtains the well logging resistivity curve of the different depth of boring;
Step S4 carries out superimposed contrast by will log well resistivity curve and described high frequency mt resistivity curve of curvilinear translation, appoints and gets congruent points, calculates the difference of congruent points on two curves, proofreaies and correct described high frequency mt resistivity curve according to described difference;
Step S5, the weighted mean value that is positioned near the multiple spot of 20 meters of edpth of tunnel absolute altitude on the described high frequency mt resistivity curve behind the calculation correction obtains the rock mass true resistivity;
Step S6 is according to formula
Calculate the rock mass integrity factor, wherein, K
RBe rock mass integrity factor, ρ
rBe rock resistivity, ρ
MassBe described rock mass true resistivity, ρ
wBe weak resistivity of media in the rock mass, and
Particularly, high frequency mt field signal among the described step S1 is to utilize the very big natural electromagnetic field of energy as field source, when the electric current system of ionosphere, high-altitude, magnetosphere changes or produces atmosphere thunder and lightning effect, the magnetic field of the earth produces fluctuation, the electric field that go out to change at the earth internal induction of conduction is the telluric field, thereby causes secondary magnetic field and the electromagnetic signal that produces.
Noise compacting among the described step S2 refers to remove the noise in the high frequency mt signal.Data screening refers to select satisfactory data in the high frequency mt signal according to setting requirement.Static shift correction refers to that the high frequency mt signal curve that is subjected to static effects is carried out translation to playback, to remove the influence of shallow face of land heterogeneous body.Topographic correction refers to that the acceptance point that will be positioned at differing heights on the survey line is corrected to reference field, to eliminate the gravity effect that topographic relief produces.The resolution coupling refers to by filtering and linear regression the resolution of high frequency mt signal curve be brought up to the resolution identical with another high resolving power curve, to improve the density of longitudinal data.Data inversion refers to according to the anti-rock mass resistivity that pushes away of high frequency mt signal that obtains.Need to prove that the detailed process of the noise compacting among the step S2, data screening, static shift correction, topographic correction, resolution coupling and data inversion is familiar with by the industry those of ordinary skill, is not described in detail in this.
Resistivity logging test among the described step S3 is the method according to the difference research boring geologic section of rock stratum or ore body and side-bed resistivity.During work, electrode system is put into boring and move along borehole sections with cable, by the instrument record logging trace, can obtain the resistivity of different depth rock according to logging trace.
Rock resistivity ρ among the described step S6
rLittle four utmost point methods are determined by appearing.Little four utmost point methods of appearing are will take a sample when measuring surface layout transmitting electrode and the potential electrode of rock, and measure rock resistivity ρ by potential electrode
r
Referring to figs. 2 and 3 as can be seen, other goodness of fit of country rock level that the country rock rank that the rock mass integrity factor that obtains according to the detection method of deep tunnel rock mass integrality of the present invention is divided is divided during with construction is up to 80%, thereby, illustrate that the rock mass integrity factor of the method according to this invention acquisition can accurately characterize the integrality of tunnel surrounding, and then, the country rock rank of dividing according to described rock mass integrity factor can macroscopic view reflection tunnel absolute altitude near the quality of surrounding rock state.
Above invention has been described in conjunction with most preferred embodiment, but the present invention is not limited to the embodiment of above announcement, should contain various modification, equivalent combinations of carrying out according to essence of the present invention.
Claims (4)
1. the detection method of a deep tunnel rock mass integrality comprises the steps:
(1) obtains the high frequency mt field signal on the face of land to be measured;
(2) described high frequency mt field signal is carried out pre-service and obtain high frequency mt resistivity curve;
(3) by the mode of deep tunnel boring is carried out the resistivity logging experiment, obtain the well logging resistivity curve of the different depth of boring, carry out superimposed contrast by will log well resistivity curve and described high frequency mt resistivity curve of curvilinear translation, appoint and get congruent points, calculate the difference of congruent points on two curves, proofread and correct described high frequency mt resistivity curve according to described difference, and the weighted mean value that is positioned near the multiple spot the edpth of tunnel absolute altitude on the described high frequency mt resistivity curve behind the calculation correction obtains the rock mass true resistivity;
(4) according to formula
Calculate the rock mass integrity factor, wherein, K
RBe rock mass integrity factor, ρ
rBe rock resistivity, ρ
MassBe described rock mass true resistivity, ρ
wBe weak resistivity of media in the rock mass, and
2. the detection method of deep tunnel rock mass integrality as claimed in claim 1 is characterized in that, described step (1) is specially:
Measure the high frequency mt field signal on the face of land to be measured by high frequency telluric electromagnetic sounding instrument.
3. the detection method of deep tunnel rock mass integrality as claimed in claim 2 is characterized in that, described high frequency mt field signal is time series signal.
4. the detection method of deep tunnel rock mass integrality as claimed in claim 1 is characterized in that, in the described step (2) described high frequency mt field signal is carried out pre-service and comprises:
Noise compacting, data screening, static shift correction, topographic correction, resolution coupling and data inversion.
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| CN104903750A (en) * | 2014-07-23 | 2015-09-09 | 王雅苹 | Amplitude preservation statics method of electromagnetic data |
| CN107741488A (en) * | 2017-09-20 | 2018-02-27 | 西安工业大学 | Constructing tunnel phase Rock-mass integrity index KvComputational methods |
| CN109471178B (en) * | 2018-11-02 | 2020-10-27 | 江苏省地震局 | Earth electric field sensor system and electrode embedding method thereof |
| CN110824567B (en) * | 2019-09-30 | 2020-12-22 | 中南大学 | Device for quickly positioning leakage point of ditch and control method thereof |
| CN110968840A (en) * | 2019-12-05 | 2020-04-07 | 中国铁路设计集团有限公司 | Method for judging grade of tunnel surrounding rock based on magnetotelluric sounding resistivity |
| CN111965712B (en) * | 2020-10-21 | 2021-03-02 | 国网江西省电力有限公司电力科学研究院 | Method for correcting static effect of controllable source audio magnetotelluric method |
| CN112666612B (en) * | 2020-11-02 | 2022-04-29 | 中国铁路设计集团有限公司 | Magnetotelluric two-dimensional inversion method based on tabu search |
| CN113010942B (en) * | 2021-02-25 | 2022-10-25 | 中国铁路设计集团有限公司 | Tunnel excavation risk early warning and surrounding rock grading evaluation method |
| CN113920141B (en) * | 2021-12-15 | 2022-02-11 | 中南大学 | Rock integrity coefficient calculation method and device and storage medium |
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| CN101775981A (en) * | 2009-01-09 | 2010-07-14 | 中国石油天然气集团公司 | Method for determining true formation resistivity |
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| JPH10153666A (en) * | 1996-11-25 | 1998-06-09 | Kumagai Gumi Co Ltd | Prediction method for geology of crust in face front in tunnel |
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| CN101775981A (en) * | 2009-01-09 | 2010-07-14 | 中国石油天然气集团公司 | Method for determining true formation resistivity |
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| Title |
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| JP特开平10-153666A 1998.06.09 |
| 杨毅明等.高频大地电磁测深在深埋隧道中应用实例分析.《工程地球物理学报》.2009,第6卷(第增刊期),37-41. |
| 高频大地电磁测深在深埋隧道中应用实例分析;杨毅明等;《工程地球物理学报》;20090831;第6卷(第增刊期);37-41 * |
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Effective date of registration: 20160504 Address after: 430063 Wuchang, Hubei, Yang Park, Heping Avenue, No. 745 Patentee after: Wuhan Construction Engineering Consulting Co., Ltd. Address before: Tiesiyuan Technology Center No. 745 Yang Park Peace Avenue 430080 in Hubei province Wuhan city Wuchang District Patentee before: The forth Survey and Design Institute (Group) Co., Ltd. Of CRCC |