CN113378263A - Stability analysis method for underground cavern crown slow-inclination structural surface - Google Patents
Stability analysis method for underground cavern crown slow-inclination structural surface Download PDFInfo
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Abstract
A stability analysis method for a gentle dip structural surface of an underground cavern crown relates to the field of stress analysis of surrounding rocks. The method for analyzing the stability of the underground cavern crown slow-inclination structural surface is characterized in that holes are drilled in the underground cavern crown from bottom to top, data are collected to conduct statistics to determine the characteristics of the underground cavern slow-inclination structural surface, and the characteristics of the underground cavern slow-inclination structural surface are divided into a slow-inclination structural surface forming a block body, a longer slow-inclination structural surface and a shorter slow-inclination structural surface which do not form the block body according to the instability mode of the underground cavern crown slow-inclination structural surface, and local stability is calculated and analyzed respectively. The stability analysis method for the top arch gentle-inclination structural surface of the underground cavern can effectively avoid the problems of low precision, easiness in omission and the like of a conventional method, more reasonably and comprehensively judges the space extension condition and the character characteristics of the gentle-inclination structural surface, and analyzes the instability mode and the stability of the top arch gentle-inclination structural surface in a system.
Description
Technical Field
The application relates to the field of stress analysis of surrounding rocks, in particular to a stability analysis method for a slowly-inclined structural plane of a top arch of an underground cavern.
Background
Geological problems caused by slowly inclined structural planes possibly exist in the surrounding rocks of the top arch of the underground cavern, hidden dangers exist in long-term operation and construction safety, and the method also becomes one of important problems to be solved urgently in underground cavern engineering investigation. Meanwhile, due to the fact that the exploration precision in the early stage is limited, and the gentle-inclination structural surface has the hidden characteristic on the top arch of the underground cavern, the extension condition of the gentle-inclination structural surface is difficult to accurately find out, and therefore the instability damage mode and the stability of the gentle-inclination structural surface are difficult to analyze and quantitatively evaluate.
The traditional method for searching and analyzing the slowly-inclined structural surface of the underground cavern mainly depends on exploring and acquiring structural surface data near the underground cavern, statistical analysis is carried out on the development characteristics of the structural surface, the development characteristics of the slowly-inclined structural surface in the surrounding rock of the top arch of the underground cavern are presumed by the method, and qualitative analysis of stability is carried out.
Disclosure of Invention
The application aims to provide a stability analysis method for a top arch gentle-dip structural surface of an underground cavern, which can effectively avoid the problems of low precision, easiness in omission and the like of a conventional method, more reasonably and comprehensively judge the space extension condition and the character characteristics of the gentle-dip structural surface, and systematically analyze the instability mode and the stability of the top arch gentle-dip structural surface.
The embodiment of the application is realized as follows:
the embodiment of the application provides a stability analysis method for a slowly-inclined structural surface of an underground cavern crown, which comprises the following steps:
drilling holes in the top arch of the underground cavern from bottom to top, collecting structural surface position, occurrence and property data inside the drilled holes, counting the data of a plurality of drilled holes on the top arch of the underground cavern to determine the characteristics of the slowly-inclined structural surface of the underground cavern, and dividing the slowly-inclined structural surface of the underground cavern, a longer slowly-inclined structural surface without blocks and a shorter slowly-inclined structural surface relative development area into slowly-inclined structural surfaces which form blocks according to the characteristics of the slowly-inclined structural surface of the underground cavern in a destabilization mode of the slowly-inclined structural surface of the top arch of the underground cavern;
calculating a stability coefficient of a gentle-dip structural surface forming the block by adopting a block theory; for a long and large slowly-inclined structural surface which does not form a block body, when the structural surface is in a tension fracture type, the calculation formula of the stability coefficient K is as follows:
when the structural surface is a bending type, the calculation formula of the stability coefficient K is as follows:
in the formula, σtThe tensile strength of the rock is L and theta, the length and the inclination angle of the gentle dip structural surface are L and theta, h is the burial depth of the gentle dip structural surface in the crown, and gamma is the rock gravity; and qualitatively analyzing the local stability of the short slowly inclined structural plane compared with a development area.
In some alternative embodiments, down-the-hole drill is used to drill holes in the crown of the underground cavern from bottom to top.
In some optional embodiments, when the position, the state and the property data of the structural surface in the drill hole are collected, high-definition video recording is carried out on the interior of the drill hole.
The beneficial effect of this application is: the method for analyzing the stability of the gentle-inclination structural surface of the top arch of the underground cavern comprises the following steps: drilling holes in the top arch of the underground cavern from bottom to top, collecting structural surface position, occurrence and property data inside the drilled holes, counting the data of a plurality of drilled holes on the top arch of the underground cavern to determine the characteristics of the slowly-inclined structural surface of the underground cavern, and dividing the slowly-inclined structural surface of the underground cavern, a longer slowly-inclined structural surface without blocks and a shorter slowly-inclined structural surface relative development area into slowly-inclined structural surfaces which form blocks according to the characteristics of the slowly-inclined structural surface of the underground cavern in a destabilization mode of the slowly-inclined structural surface of the top arch of the underground cavern; calculating a stability coefficient of a gentle-dip structural surface forming the block by adopting a block theory; for a long and large slowly-inclined structural surface which does not form a block body, when the structural surface is in a tension fracture type, the calculation formula of the stability coefficient K is as follows:
when the structural surface is a bending type, the calculation formula of the stability coefficient K is as follows:
in the formula, σtThe tensile strength of the rock is L and theta, the length and the inclination angle of the gentle dip structural surface are L and theta, h is the burial depth of the gentle dip structural surface in the crown, and gamma is the rock gravity; and qualitatively analyzing the local stability of the short slowly inclined structural plane compared with a development area. The stability analysis method for the top arch gentle-inclination structural surface of the underground cavern can effectively avoid the problems of low precision, easiness in omission and the like of a conventional method, more reasonably and comprehensively judges the space extension condition and the character characteristics of the gentle-inclination structural surface, and analyzes the instability mode and the stability of the top arch gentle-inclination structural surface in a system.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
FIG. 1 is a schematic flow chart of a method for analyzing stability of a gentle dip structural surface of an arch of an underground cavern provided by an embodiment of the application;
fig. 2 is a schematic structural diagram of drilling an underground cavern crown by using the method for analyzing the stability of the gentle-inclination structural surface of the underground cavern crown according to the embodiment of the application;
fig. 3 is a stability calculation pattern diagram for a long large gentle inclination structural surface that does not form a block and a structural surface that is in a stretch-breaking type in the stability analysis method for an underground cavern crown gentle inclination structural surface provided in the embodiment of the present application;
fig. 4 is a stability calculation pattern diagram of an underground cavern crown gentle inclination structural surface stability analysis method provided in the embodiment of the present application for a long and large gentle inclination structural surface that does not form a block and a structural surface that is a bent type.
The figures are numbered: 1. drilling; 2. a gentle dip structural plane; 3. the rock mass.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. 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 application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the application usually place when in use, and are used only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the devices or elements being referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present application, it is further noted that, unless expressly stated or limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The characteristics and performance of the method for analyzing the stability of the gentle-dip structural surface of the top arch of the underground cavern are further described in detail in the following with reference to the examples.
As shown in fig. 1, fig. 2, fig. 3 and fig. 4, the present embodiment provides a method for analyzing stability of a structural plane of a crown gentle dip of an underground cavern, including the following steps:
adopting a down-the-hole drill to drill holes on an underground cavern crown rock body 3 from bottom to top without coring, adopting high-definition television video to collect structural surface position, occurrence and property data inside the drill holes 1, carrying out statistics on the data of a plurality of drill holes 1 on the underground cavern crown to determine the characteristics of a slowly-inclined structural surface 2 of the underground cavern, and dividing the slowly-inclined structural surface into a slowly-inclined structural surface forming a block, a longer slowly-inclined structural surface not forming the block and a shorter slowly-inclined structural surface relatively-developing area according to the characteristics of the slowly-inclined structural surface 2 of the underground cavern crown in a destabilization mode of the slowly-inclined structural surface 2 of the underground cavern crown;
calculating a stability coefficient of a gentle-dip structural surface forming the block by adopting a block theory; for a long and large slowly-inclined structural surface which does not form a block body, when the structural surface is in a tension fracture type, the calculation formula of the stability coefficient K is as follows:
when the structural surface is a bending type, the calculation formula of the stability coefficient K is as follows:
in the formula, σtThe tensile strength of the rock is L and theta, the length and the inclination angle of the gentle dip structural surface are L and theta, h is the burial depth of the gentle dip structural surface in the crown, and gamma is the rock gravity; and qualitatively analyzing the local stability of the short slowly inclined structural plane compared with a development area.
The method for analyzing the stability of the top arch gentle-inclination structural surface of the underground cavern provided by the embodiment is used for acquiring the data of the structural surface of the top arch of the underground cavern by drilling down-the-hole, so that the defect that the development condition of the top arch structural surface is indirectly inferred by the traditional method is overcome, the extension condition of the top arch gentle-inclination structural surface is found out by searching the development conditions of the structural surfaces of different drill holes 1, the long and large structural surfaces are ensured not to be omitted, meanwhile, the instability mode distinction generated by the top arch gentle-inclination structural surface of the underground cavern is completed according to the extension condition of the structural surfaces and the character characteristics of the structural surfaces, the quantitative stability evaluation is carried out according to different instability modes, and the quantitative calculation of the stability of the long and large gentle-inclination structural surface which does not form a block is realized.
The stability analysis method for the top arch gentle-inclination structural surface of the underground cavern can effectively avoid the problems of low precision, easiness in omission and the like of a conventional method, more reasonably and comprehensively judges the space extension condition and the character characteristics of the gentle-inclination structural surface, and analyzes the instability mode and the stability of the top arch gentle-inclination structural surface in a system.
The embodiments described above are some, but not all embodiments of the present application. The detailed description of the embodiments of the present application is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. 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 application.
Claims (3)
1. A stability analysis method for a gentle dip structural surface of an underground cavern crown is characterized by comprising the following steps:
drilling holes in an underground cavern crown from bottom to top, collecting structural surface position, occurrence and property data inside the drilled holes, counting the data of the drilled holes on the underground cavern crown to determine the characteristics of a slowly-inclined structural surface of the underground cavern, and dividing the slowly-inclined structural surface of the underground cavern into a slowly-inclined structural surface forming a block, a longer slowly-inclined structural surface not forming the block and a shorter slowly-inclined structural surface relatively-developed area according to the characteristics of the slowly-inclined structural surface of the underground cavern crown in a destabilization mode;
calculating a stability coefficient of the slowly inclined structural surface of the block body by adopting a block body theory; for the long slow-tilting knot not forming a block bodyAnd when the structural surface is in a tensile crack type, the calculation formula of the stability coefficient K is as follows:
when the structural surface is a bending type, the calculation formula of the stability coefficient K is as follows:
in the formula, σtThe tensile strength of the rock is L and theta, the length and the inclination angle of the gentle dip structural surface are L and theta, h is the burial depth of the gentle dip structural surface in the crown, and gamma is the rock gravity; and qualitatively analyzing the local stability of the short slowly inclined structural plane compared with a development area.
2. The method for analyzing the stability of the slowly inclined structural surface of the crown arch of the underground cavern as claimed in claim 1, wherein a down-the-hole drill is used for drilling holes in the crown arch of the underground cavern from bottom to top.
3. The method for analyzing the stability of the gentle-inclination structural surface of the top arch of the underground cavern, according to claim 1, is characterized in that when the position, the occurrence and the property data of the structural surface in the drill hole are collected, high-definition video recording is carried out on the interior of the drill hole.
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| US20170092384A1 (en) * | 2014-06-13 | 2017-03-30 | Changjiang Survey Planning And Research Co., Ltd. | Migration prevention system for radioactive wastewater of underground nuclear power plant |
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