CN114117610A - Method for processing and designing asymmetric geology of arch dam foundation - Google Patents
Method for processing and designing asymmetric geology of arch dam foundation Download PDFInfo
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Abstract
The invention discloses a processing and designing method for arch dam foundation geological asymmetry, belongs to the technical field of water conservancy and hydropower engineering, and provides a processing and designing method for arch dam foundation geological asymmetry realized by combining a finite element analysis method, which can improve the effectiveness and 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 two-dimensional and three-dimensional finite element methods; according to geological dissymmetry at two banks, a target value of the comprehensive deformation model after replacement treatment is provided; the calculation by the sub-model method can analyze the space stress state of the displacement body with smaller calculation amount and can provide basis 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 processing design method for geological asymmetry of an arch dam foundation.
Background
High arch dams are mostly built in high mountain canyon regions, and generally, geological conditions of dam sites of the high arch dams are relatively complex. Besides fault, crack dense zone and alteration metamorphic weak rock, the rock has bad geological conditions such as deep unloading and strong weathering. As a space shell structure, the arch dam transmits water thrust to the dam shoulders of the two banks, and the foundations of the two banks are required to have enough rigidity and strength, so that the concrete arch dam design specification is clear, the dam foundation has the strength and the rigidity which can sufficiently meet the requirements of bearing capacity and deformation control after treatment, and the anti-sliding stability of the arch base and the 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 bedrock. The dam foundation treatment measures are selected according to geological conditions and treatment purposes, and can adopt the measures of excavation, cushion seat, thrust pier, gravity pier, wing dam, consolidation grouting, contact grouting, seepage-proofing drainage, concrete replacement of weak rocky zone and prestressed anchorage. "
In order to meet the requirement of building foundation rock mass of the arch dam specified by the specification, the foundation rock is preferably in good condition, and the two-bank topographic and geological symmetrical dam sites are the first work of the design of the arch dam. Under the premise that a dam site with excellent conditions cannot be selected, manual modification, namely dam foundation treatment, of the dam site is generally considered. Compared with a weak rocky zone of a foundation surface, the geological asymmetric condition of two banks caused by continuous distribution of unfavorable geological conditions in certain sections of one bank, generally within a certain elevation range of the top of the dam and below, is a dam foundation treatment design subject with higher macroscopicity, high cost, importance and difficulty.
The arch dam is a high-order statically indeterminate structure and can adapt to the geological asymmetry of the landforms of the two banks to a certain degree. Generally, a noncircular variable-thickness quadratic curve is adopted, different curvatures are adopted on the left half arch and the right half arch of an arch ring, and relatively reasonable stress distribution conditions are obtained through asymmetric arrangement. At present, most of the arch ring line types at home and abroad adopt variable-thickness non-circular arch ring sections, such as three-center circles, parabolas, logarithmic spirals, ellipses, uniform quadratic curves, mixed curves and the like to adapt to asymmetric topographic and geological conditions. But the geological conditions of the symmetrical dam foundation can enable the high arch dam to exert higher overload capacity, namely, higher safety margin is obtained, so that the dam foundation treatment is enlarged to be a more popular method for modifying the asymmetrical geological conditions, and measures such as a large cushion seat, a concrete large foot pad, a gravity pier, a thrust pier and the like are widely adopted at home and abroad.
For the dam foundation asymmetric geological condition processing design, empirical method and numerical method calculation are mostly carried out from the angle of improving the total deformation modulus of the corresponding elevation of the weak one bank of the dam foundation, and geomechanical model test verification is combined. But the traditional method has poor calculation accuracy.
Disclosure of Invention
The invention aims to provide a processing and designing method for realizing the geological 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 by the invention for solving the technical problems is as follows: the asymmetric processing design method of the arch dam foundation geology is based on the combination of a two-dimensional plane finite element method and a three-dimensional finite element method, and comprises the following steps:
selecting a representative elevation tangent map of a soft dam foundation section, providing a variable modulus target value of each soft section according to geological asymmetry, and drawing up a concrete replacement type for treating soft rock according to the arch thrust direction and the soft rock range trend;
establishing a regular plane finite element grid, setting or adjusting the range of the replacement depth and the width, performing plane finite element calculation and comparison, comparing with a variable-mode target value to determine whether the standard is met, and adjusting the replacement range;
step three, carrying out space modeling on a reasonable plane replacement scheme, judging whether the structure is reasonable or not, judging whether construction is feasible or not, and adjusting the structural form;
and step four, three-dimensional analysis is carried out on the replacement scheme arch dam foundation, and whether the stress of the arch dam foundation is reasonable or not is judged.
Further, the method comprises the following steps: in the first step, the concrete replacement of the soft rock is processed in the modes of concrete replacement, force transmission holes or consolidation grouting.
The invention has the beneficial effects that: the invention can adapt to the concrete replacement design of asymmetric geological conditions with various forms and characteristics by combining two-dimensional and three-dimensional finite element methods; according to geological dissymmetry at two banks, a target value of the comprehensive deformation model after replacement treatment is provided; the calculation by the sub-model method can analyze the space stress state of the displacement body with smaller calculation amount and can provide basis for the subsequent possible reinforcement calculation.
Drawings
FIG. 1 is a flow chart of a processing and designing method for arch dam foundation geological asymmetry according to the invention;
FIG. 2 is a schematic diagram of concrete replacement treatment adopted in the arch dam foundation geology asymmetric treatment design method of the present invention;
FIG. 3 is a schematic illustration of spatial modeling of a displacement solution for an arch dam foundation;
FIG. 4 is a schematic illustration of a three-dimensional finite element analysis of an arch dam foundation;
Detailed Description
The invention is further described with reference to the following figures and detailed description.
It should be noted that, if there are directional indication terms, such as the terms of direction and orientation, above, below, left, right, front and back, in the present invention, for facilitating the description of the relative positional relationship between the components, the absolute position that is not the positional relationship between the related components and the components is specifically referred to, and is only used for explaining the relative positional relationship and the motion situation between the components in a specific posture, and if the specific posture is changed, the directional indication is changed accordingly. When the present invention relates to a number, such as "a plurality", "several", etc., two or more than two are specifically referred to.
As shown in the figure 1, the processing and design method for the geological asymmetry of the arch dam foundation is based on the processing and design method for the geological asymmetry of the arch dam foundation combining a two-dimensional plane finite element method and a three-dimensional finite element method, and comprises the following steps:
selecting a representative elevation tangent map of a soft dam foundation section, providing a variable modulus target value of each soft section according to geological asymmetry, and drawing up a concrete replacement processing type according to the arch thrust direction and the soft rock range trend.
Comparing and analyzing the difference of the natural basic variable modes at two banks, and drawing up a variable mode target value after treatment. If the comprehensive variable modulus height of the two banks of the ith layer of arch ring is Ehi and Eli, the comprehensive variable modulus Eti after the dam foundation treatment target of the low variable modulus side is processed is equivalent to the comprehensive variable modulus of the two banks after the treatment according to engineering experiences of the second beach, the brocade screen, the bay and the like, and the variable modulus of the bottom side is not lower than 0.8 times of the variable modulus of the high side, namely:
Ehi≥Eti≥0.8Ehi≥Eli
secondly, according to the range trend and the arch thrust direction of the weak rocks, planning treatment modes of the weak rocks, and specifically comprising treatment modes of concrete replacement, force transmission holes, consolidation grouting and the like; without loss of generality, concrete replacement is representative, determining preliminary patterns and ranges. A typical process may refer to, but is not limited to, the pattern shown in fig. 2.
And step two, establishing a regular plane finite element grid, setting or adjusting the range of the replacement depth and width, performing plane finite element calculation comparison, comparing with a variable mode target value to determine whether the standard is met, and adjusting the replacement range.
Step three, carrying out space modeling on a reasonable plane replacement scheme, judging whether the structure is reasonable and whether construction is feasible or not as shown in fig. 3, and adjusting the structural form;
and step four, three-dimensional analysis is carried out on the replacement scheme arch dam foundation, and if the stress of the arch dam foundation is reasonable, the arch dam foundation is judged.
Claims (2)
1. A processing design method for arch dam foundation geology asymmetry is a processing design method for arch dam foundation geology asymmetry 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:
selecting a representative elevation tangent map of a soft dam foundation section, providing a variable modulus target value of each soft section according to geological asymmetry, and drawing up a concrete replacement type for treating soft rock according to the arch thrust direction and the soft rock range trend;
establishing a regular plane finite element grid, setting or adjusting the range of the replacement depth and the width, performing plane finite element calculation and comparison, comparing with a variable-mode target value to determine whether the standard is met, and adjusting the replacement range;
step three, carrying out space modeling on a reasonable plane replacement scheme, judging whether the structure is reasonable or not, judging whether construction is feasible or not, and adjusting the structural form;
and step four, three-dimensional analysis is carried out on the replacement scheme arch dam foundation, and whether the stress of the arch dam foundation is reasonable or not is judged.
2. The arch dam foundation geology asymmetric processing design method of claim 1, characterized in that: in the first step, the concrete replacement of the soft rock is processed in the modes of concrete replacement, force transmission holes or consolidation grouting.
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| 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 |
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2021
- 2021-11-30 CN CN202111439919.7A patent/CN114117610B/en active Active
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| 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 |
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