CN106952345B - Method for controlling base coating interface under condition of ultra-deep covering layer - Google Patents
Method for controlling base coating interface under condition of ultra-deep covering layer Download PDFInfo
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Abstract
The invention relates to the field of geological three-dimensional design, and discloses a method for controlling a base-cover interface under the condition of an ultra-deep covering layer, which corrects grid nodes which do not conform to the conventional method and realizes reasonable distribution of the spatial form of the base-cover interface under the condition of a complex ultra-deep covering layer. The method comprises the following steps: establishing an initial basis coverage interface model; obtaining the river bed longitudinal gradient ratio of the initial base-cover interface model by adopting a method of engineering geological quantitative analysis; judging whether the drilling elevation of the upstream and downstream riverbeds accords with the groundwater seepage rule, if so, finishing, otherwise, calculating the elevation of a point M based on the drilling elevation of the upstream riverbed, the length of a central axis of the riverbed and the longitudinal slope-to-slope ratio of the riverbed, wherein the point M is positioned at the downstream and on the central axis of the riverbed; and (5) performing iterative control on the basis-covering interface of the initial basis-covering interface model by taking the point M as a new constraint point. The method is suitable for controlling the base covering interface under the condition of the ultra-deep and thick covering layer in the three-dimensional design.
Description
Technical Field
The invention relates to the field of geological three-dimensional design, in particular to a method for controlling a foundation covering interface under the condition of an ultra-deep covering layer.
Background
At present, many three-dimensional design programs and software are applied to geological profession, such as: ITASCAD, FLAC3D, GOCAD, etc.; because the research and development degree and the key point of each software are different, the difficulty degree of modeling, the model precision, the numerical calculation analysis result and the like have great differences in the specific design process.
The GOCAD software is powerful three-dimensional geological modeling software, is widely applied to geological engineering, geophysical exploration, mining development, petroleum engineering and hydraulic engineering, and has powerful three-dimensional modeling, visualization, geological interpretation and analysis functions. It can both design spatial geometric objects and represent spatial property distributions. And the system has powerful space analysis function and flexible and diverse information expression modes.
Nowadays, in a modeling method of a geological object under the condition of an ultra-deep and thick covering layer, a general flow of 'importing a ground surface and a geological boundary line, extracting exploration data, extracting coordinate points, creating/defining a geological interface, issuing and checking a component' is generally adopted.
In the prior art, exploration, geological survey and test data are mainly relied on for modeling geological objects. And creating a constraint point or a control point of the geological object in a data extraction mode, performing initial tearing and iteration on the object, further controlling the boundary of the object by introducing a surface boundary line, and finally endowing the object with attributes according to a test result.
The traditional method is limited by the exploration detail degree and the exploration precision, generally, in the hydropower planning stage, under the condition of low exploration precision and under the complex geological condition of ultra-deep overburden and wide valley, the three-dimensional design process has few constraint points or control points, large spacing and sparse distribution, so that the established object space form is contrary to the basic geological rule, the phenomenon of 'reverse warping' of the riverbed foundation interface is often generated, the phenomenon is not in accordance with the seepage rule of underground water, and the modeling result is difficult to be used as the downstream professional design basis.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the method for controlling the base-cover interface under the condition of the ultra-deep and thick covering layer is provided, the grid nodes which do not conform to the conventional grid are corrected, and the reasonable distribution of the space form of the base-cover interface under the condition of the complex ultra-deep and thick covering layer is realized.
In order to solve the problems, the invention adopts the technical scheme that: a method for substrate-to-substrate interface control under ultra-deep overburden conditions, comprising the steps of:
according to the existing exploration data serving as a geological object constraint point, object boundary control is carried out through an earth surface boundary line, and an initial basis coverage interface model is established by a method of mutual correction of a two-dimensional section and a three-dimensional model;
obtaining the river bed longitudinal gradient ratio of the initial base-cover interface model by adopting a method of engineering geological quantitative analysis; generally, the longitudinal gradient ratio of the riverbed is 0.01;
acquiring drilling hole elevations of an upstream riverbed and a downstream riverbed and the length of a central axis of the riverbed from an initial foundation coverage interface model, wherein the drilling hole of the upstream riverbed is positioned on the central axis of the riverbed;
judging whether the drilling hole elevations of the upstream and downstream riverbeds meet the groundwater seepage rule or not, if so, indicating that adjustment is not needed, and ending; if the measured value does not meet the preset standard, indicating that the adjustment is needed, calculating the elevation of a point M based on the drilling elevation of the upstream riverbed, the length of the central axis of the riverbed and the longitudinal slope-to-slope ratio of the riverbed, wherein the point M is positioned at the downstream and is on the central axis of the riverbed;
and (5) performing iterative control on the basis-covering interface of the initial basis-covering interface model by taking the point M as a new constraint point.
The invention has the beneficial effects that: the invention can be based on the current situation of less exploration information, combines with geological macroscopic judgment and cognition, corrects the grid nodes which do not conform to the conventional method, realizes the reasonable distribution of the space form of the base-cover interface under the condition of a complex ultra-deep covering layer, lays a cushion for accurately modeling geological objects (layers, lens bodies and the like) in the covering layer and ensures the subsequent design of downstream specialties.
Detailed Description
The embodiment provides a method for controlling a fundamental-coverage interface under the condition of an ultra-deep covering layer, which is characterized in that according to a traditional modeling method, namely, according to the existing exploration data serving as a geological object constraint point, object boundary control is carried out through a ground surface boundary line, an initial fundamental-coverage interface model is established by a method of mutual correction of a two-dimensional section and a three-dimensional model, finally, engineering geological quantitative analysis is adopted, the longitudinal slope-to-gradient ratio of a deep channel of a riverbed is determined to be 0.01, therefore, the non-conforming grid nodes are corrected, and the reasonable distribution of the spatial form of the fundamental-coverage interface under the condition of the ultra-deep covering layer is realized. The specific implementation process is as follows:
(1) basic data analysis
At the present stage, the exploration result and the engineering geological condition of the dam site area are clarified: the river valley of the dam site area is nearly 2km wide and is in a U-shaped valley, the covering layer is deep and complex in structure, and the maximum thickness of the covering layer is 567m as shown by drilling. Due to limited exploration accuracy, the riverbed "deep slot" controlled boreholes are only 4, namely downstream boreholes zkm01, zkm02, zkm03, and upstream borehole zkm 04. According to the existing exploration data serving as geological object constraint points, object boundary control is carried out through the surface boundary line, and an initial basis coverage interface model is established by a method of mutual correction of a two-dimensional section and a three-dimensional model. The initial bedding interface model revealed that bedrock elevation 2382m of upstream borehole zkm04 is lower than bedrock elevation 2482m of downstream borehole zkm 02.
(2) Initial model "lesion" analysis
Due to the lack of controllable drilling and the phenomenon that the elevation of bedrock disclosed by the conventional drilling is higher at the downstream than at the upstream, the rationality of the model established by adopting the conventional drilling control method needs to be improved; the model has the phenomenon of 'bed rock reverse warping' at the downstream of the riverbed and does not accord with the groundwater seepage rule. Thus, embodiments require a controlled borehole to be obtained to control the initial overburden interface model.
(3) Solving means
The length of the initial basis covers the interface model Y axle direction (downstream direction) is 5.45km, namely the riverbed central axis is 5.45km, use engineering geology quantitative analysis to obtain the riverbed 'deep trouth' after the upstream starting point to the downstream 3.6km section morphology smooth and reasonable, use the system analysis function, calculate the initial basis covers the average longitudinal gradient of the interface model and fall the ratio to be 0.01. Meanwhile, by means of comparative analysis and geological macroscopic knowledge, the abnormal high elevation of the midpoint M (the point M is positioned on the axial line of the riverbed) of the connecting line of the downstream drill holes zkm01 and zkm02 is obtained, and the abnormal high elevation is the reason of the phenomenon of 'bed rock tilting'; therefore, the embodiment takes the vertical slope-to-fall ratio of 0.01 as a standard reference, and the actual Z-axis coordinate (i.e. elevation) of the point M is 2327.5M calculated by the elevation of the drilled hole zkm04 of the upstream riverbed, the length of the central axis of the riverbed is 5.45km and the vertical slope-to-fall ratio of the riverbed is 0.01, wherein the calculation formula is as follows: the elevation of the point M is the drilling elevation of the upstream riverbed-the length of the central axis of the riverbed is the longitudinal slope drop ratio. Therefore, the elevation of the point M needs to be adjusted to 2327.5M, and then the point M is used as a new constraint point to perform iterative control on the model, and finally a valley form with reasonable space distribution is formed.
The foregoing describes the general principles and features of the present invention and, together with the general principles of the invention, further modifications and improvements thereto, may be made without departing from the spirit and scope of the invention as set forth in the appended claims.
Claims (3)
1. A method for substrate-to-substrate interface control under ultra-deep overburden conditions, comprising the steps of:
according to the existing exploration data serving as a geological object constraint point, object boundary control is carried out through an earth surface boundary line, and an initial basis coverage interface model is established by a method of mutual correction of a two-dimensional section and a three-dimensional model;
obtaining the riverbed longitudinal gradient ratio of the initial basal covering interface model;
acquiring drilling hole elevations of an upstream riverbed and a downstream riverbed and the length of a central axis of the riverbed from an initial foundation coverage interface model, wherein the drilling hole of the upstream riverbed is positioned on the central axis of the riverbed;
judging whether the drilling elevation of the upstream and downstream riverbeds accords with the groundwater seepage rule, if so, finishing, otherwise, calculating the elevation of a point M based on the drilling elevation of the upstream riverbed, the length of a central axis of the riverbed and the longitudinal slope-to-slope ratio of the riverbed, wherein the point M is positioned at the downstream and on the central axis of the riverbed;
and (5) performing iterative control on the basis-covering interface of the initial basis-covering interface model by taking the point M as a new constraint point.
2. The method for overburden interface control under the condition of the ultra-deep overburden as recited in claim 1, wherein a river bed vertical gradient ratio of an initial overburden interface model is obtained by adopting a method of engineering geological quantitative analysis.
3. The method for overburden interface control under ultra deep overburden conditions as recited in claim 2 wherein said riverbed vertical slope drawdown ratio is 0.01.
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