CN114117610B - Arch dam foundation geology asymmetry processing design method - Google Patents
Arch dam foundation geology asymmetry processing design method Download PDFInfo
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- CN114117610B CN114117610B CN202111439919.7A CN202111439919A CN114117610B CN 114117610 B CN114117610 B CN 114117610B CN 202111439919 A CN202111439919 A CN 202111439919A CN 114117610 B CN114117610 B CN 114117610B
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Abstract
The invention discloses a method for processing and designing the asymmetry of the ground geology of an arch dam, belongs to the technical field of hydraulic and hydroelectric engineering, and provides a method for processing and designing the asymmetry of the ground geology of the arch dam, which is realized by combining a finite element analysis method, and can improve the effectiveness and the accuracy of a design scheme. The invention can adapt to the concrete replacement design of asymmetric geological conditions with various forms and characteristics by combining a two-dimensional finite element method and a three-dimensional finite element method; according to the geological incoordination of the two banks, a target value of comprehensive variable modulus after displacement treatment is provided; the sub-model method is adopted for calculation, so that the space stress state of the displacement body can be analyzed with smaller calculated amount, and a basis can be provided for the subsequent possible reinforcement calculation.
Description
Technical Field
The invention relates to the technical field of water conservancy and hydropower engineering, in particular to a method for processing and designing the geology asymmetry of an arch dam foundation.
Background
The high arch dam is mostly built in the high mountain gorge valley area, and in general, the geological conditions of the high arch dam site are relatively complex, and besides faults, fracture dense bands and altered metamorphic weak rocks, the high arch dam has bad geological conditions such as deep unloading, strong weathering and the like. The arch dam is used as a space shell structure, water thrust is transmitted to the two-bank dam abutment, and the two-bank foundation is required to have enough rigidity and strength, so that the concrete arch dam design specification clearly requires that the dam abutment has enough strength and rigidity to meet the requirements of bearing capacity and deformation control after being processed, and the stability of arch abutment anti-skid and integral stability of the arch dam are met. The dam foundation treatment scheme is determined by arch dam structure analysis and stability analysis according to the geological conditions of the dam site and the physical and mechanical properties of the bedrock. The dam foundation treatment measures are selected according to geological conditions and treatment purposes, and the measures of excavation, cushion seats, thrust piers, gravity piers, wing dams, consolidation grouting, contact grouting, seepage prevention and drainage, weak rock belt concrete replacement and prestress anchoring can be adopted.
In order to meet the requirements of foundation rock mass of an arch dam specified by specifications, the preferable foundation rock condition is good, and the geology symmetric dam site of the topography on two sides is the primary work of arch dam design. Under the premise that the dam sites with excellent conditions cannot be selected, the manual modification of the dam sites, namely dam foundation treatment, is generally considered. Compared with a weak rock zone on a building base surface, certain sections of one bank, generally in a certain elevation range of a dam crest and below, poor geological conditions are continuously distributed, and the two-bank geological asymmetric conditions are caused, so that the dam foundation treatment design problem with larger scale, high cost, importance and relatively larger difficulty is achieved.
The arch dam is a high-order hyperstatic structure and can adapt to the geological asymmetry of two-shore terrains to a certain extent. Generally, a non-circular variable-thickness conic is adopted, different curvatures are adopted on the left and right half arches of the arch ring, and a more reasonable stress distribution condition is obtained through asymmetric arrangement. At present, the arch ring line type at home and abroad mostly adopts variable thickness and non-circular arch ring sections, such as three-center circles, parabolas, logarithmic spiral lines, ellipses, unified secondary curves, mixed curves and the like, so as to adapt to asymmetric topography and geological conditions. But symmetrical dam foundation geological conditions can enable the high arch dam to exert higher overload capacity, namely higher safety margin is obtained, so that dam foundation treatment is a current method for improving asymmetric geological conditions, and the asymmetric geological conditions are improved by adopting large pad seats, concrete large foot-attaching blocks, gravity piers, thrust piers and other measures widely at home and abroad.
For the asymmetric geological condition processing design of the dam foundation, the traditional mode is mostly to perform empirical method and numerical method calculation from the angle of improving the total deformation modulus of the corresponding elevation of the weak one bank of the dam foundation, and meanwhile, the traditional mode is combined with the test verification of the geomechanical model, so that the calculation accuracy is poor.
Disclosure of Invention
The invention solves the technical problem of providing a method for processing and designing the geology asymmetry of the arch dam foundation by combining a finite element analysis method, which can improve the effectiveness and the accuracy of a design scheme.
The technical scheme adopted for solving the technical problems is as follows: the arch dam foundation geology asymmetry processing design method is based on a combined two-dimensional plane finite element method and a three-dimensional finite element method, and comprises the following steps:
firstly, selecting a representative elevation level cut graph of a weak dam foundation section, providing a variable modulus target value of each weak section according to geological asymmetry, and setting a pattern for treating weak rock concrete replacement according to arch thrust direction and weak rock range trend;
step two, establishing a regular plane finite element grid, setting or adjusting a replacement depth and width range, carrying out plane finite element calculation comparison, comparing with a variable modulus target value to judge whether the comparison reaches a standard, and adjusting the replacement range;
thirdly, spatial modeling is carried out on a reasonable plane replacement scheme, whether the structure is reasonable or not is judged, whether construction is feasible or not is judged, and structural morphology is adjusted;
and fourthly, three-dimensional analysis of the arch dam foundation by the replacement scheme is carried out, and whether the stress of the arch dam foundation is reasonable is judged.
Further is: in one step, the type of treatment of weak rock concrete displacement is concrete displacement, force transfer holes or consolidation grouting.
The beneficial effects of the invention are as follows: the invention can adapt to the concrete replacement design of asymmetric geological conditions with various forms and characteristics by combining a two-dimensional finite element method and a three-dimensional finite element method; according to the geological incoordination of the two banks, a target value of comprehensive variable modulus after displacement treatment is provided; the sub-model method is adopted for calculation, so that the space stress state of the displacement body can be analyzed with smaller calculated amount, and a basis can be provided for the subsequent possible reinforcement calculation.
Drawings
FIG. 1 is a flow chart of a method for processing and designing the geology asymmetry of an arch dam according to the present invention.
Fig. 2 is a schematic diagram of concrete replacement treatment adopted in the method for designing the geology asymmetry treatment of the arch dam according to the invention.
Fig. 3 is a schematic diagram of spatially modeling a displacement scheme of an arch dam foundation.
Fig. 4 is a schematic diagram of three-dimensional finite element analysis of an arch dam foundation.
Detailed Description
The invention is further described below with reference to the drawings and the detailed description.
As shown in the figure 1, the method for processing and designing the arch dam foundation geology asymmetry is based on a combined two-dimensional plane finite element method and a three-dimensional finite element method, and comprises the following steps:
step one, selecting a representative elevation level cut graph of a weak dam foundation section, providing a variable modulus target value of each weak section according to geological asymmetry, and planning a concrete replacement treatment type according to arch thrust direction and weak rock range trend.
(1) And comparing and analyzing the variation of natural foundations on two sides, and drawing out the variation target value after treatment. If the comprehensive variable die heights of the two banks of the ith arch ring are Ehi and Eli, the dam foundation treatment target at the low variable die side is treated and then subjected to comprehensive variable die Eti, according to engineering experience of two beaches, a brocade screen, a small bay and the like, the treated two banks are equivalent in comprehensive variable die, and the bottom variable die is not lower than 0.8 times of the high-side variable die, namely: ehi Eti is more than or equal to 0.8Ehi is more than or equal to Eli.
(2) According to the range trend of the weak rock and the arch thrust direction, the treatment modes of the weak rock are planned, and the treatment modes can comprise concrete replacement, force transmission holes, consolidation grouting and the like. Without loss of generality, the concrete displacement is representative, the preliminary pattern and scope are determined, and typical processing may be referred to, but not limited to, the pattern shown in fig. 2.
Step two, establishing a regular plane finite element grid, setting or adjusting the range of the replacement depth and the width, carrying out plane finite element calculation comparison, comparing with a variable modulus target value to judge whether the value reaches the standard, and adjusting the replacement range.
And thirdly, spatial modeling is carried out on a reasonable plane replacement scheme, whether the structure is reasonable or not is judged, whether construction is feasible or not is judged, and structural morphology is adjusted as shown in fig. 3.
And fourthly, three-dimensional analysis of the arch dam foundation by the replacement scheme, such as judging whether the stress of the arch dam foundation is reasonable or not.
Claims (1)
1. The method for processing and designing the arch dam foundation geology asymmetry is based on a combined two-dimensional plane finite element method and a three-dimensional finite element method, and is characterized in that: the method comprises the following steps:
firstly, selecting a representative elevation level cut graph of a weak dam foundation section, according to geological asymmetry, providing a variable model target value of each weak section, and according to the arch thrust direction and the weak rock range trend, setting a type for treating weak rock concrete replacement, wherein the type for treating the weak rock concrete replacement is concrete replacement, a force transmission hole or consolidation grouting;
step two, establishing a regular plane finite element grid, setting or adjusting a replacement depth and width range, carrying out plane finite element calculation comparison, comparing with a variable modulus target value to judge whether the comparison reaches a standard, and adjusting the replacement range;
thirdly, spatial modeling is carried out on a reasonable plane replacement scheme, whether the structure is reasonable or not is judged, whether construction is feasible or not is judged, and structural morphology is adjusted;
and fourthly, three-dimensional analysis of the arch dam foundation by the replacement scheme is carried out, and whether the stress of the arch dam foundation is reasonable is judged.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106498970A (en) * | 2016-11-25 | 2017-03-15 | 中国电建集团成都勘测设计研究院有限公司 | Arch dam drag body foundation reinforcing structure |
| CN206204980U (en) * | 2016-11-25 | 2017-05-31 | 中国电建集团成都勘测设计研究院有限公司 | Arch dam drag body foundation reinforcing structure |
| CN110135107A (en) * | 2019-05-29 | 2019-08-16 | 中国电建集团成都勘测设计研究院有限公司 | A kind of evaluation method of the topographic and geologic condition of proposed arch dam dam site |
| CN110263355A (en) * | 2018-12-29 | 2019-09-20 | 中国电建集团成都勘测设计研究院有限公司 | The extra-high arch dam entirety Anti-crack Design Method of complex foundation |
| CN112965376A (en) * | 2021-02-03 | 2021-06-15 | 清华大学 | Intelligent control method and device for arch dam temperature stress and transverse joint working state |
-
2021
- 2021-11-30 CN CN202111439919.7A patent/CN114117610B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106498970A (en) * | 2016-11-25 | 2017-03-15 | 中国电建集团成都勘测设计研究院有限公司 | Arch dam drag body foundation reinforcing structure |
| CN206204980U (en) * | 2016-11-25 | 2017-05-31 | 中国电建集团成都勘测设计研究院有限公司 | Arch dam drag body foundation reinforcing structure |
| CN110263355A (en) * | 2018-12-29 | 2019-09-20 | 中国电建集团成都勘测设计研究院有限公司 | The extra-high arch dam entirety Anti-crack Design Method of complex foundation |
| CN110135107A (en) * | 2019-05-29 | 2019-08-16 | 中国电建集团成都勘测设计研究院有限公司 | A kind of evaluation method of the topographic and geologic condition of proposed arch dam dam site |
| CN112965376A (en) * | 2021-02-03 | 2021-06-15 | 清华大学 | Intelligent control method and device for arch dam temperature stress and transverse joint working state |
Non-Patent Citations (1)
| Title |
|---|
| 宋子亨 ; 刘耀儒 ; 杨强 ; 徐建荣 ; 何明杰 ; 张伟狄 ; .高拱坝基础不对称性及其加固效果研究.岩土力学.2017,(第02期),第3节. * |
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