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Construction simulation method of gate head considering soft foundation consolidation and concrete creep

A simulation method and concrete technology, applied in design optimization/simulation, instrumentation, geometric CAD, etc., can solve problems such as low permeability of soft soil foundation, and achieve reasonable and accurate calculation results

Active Publication Date: 2018-09-25
HOHAI UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0006] The soft soil foundation has low permeability and obvious consolidation characteristics, causing the settlement of the foundation to change with time, and the existing soil mechanics has pointed out that the soil has elastic-plastic properties, and the traditional elastic theory is no longer applicable

Method used

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  • Construction simulation method of gate head considering soft foundation consolidation and concrete creep
  • Construction simulation method of gate head considering soft foundation consolidation and concrete creep
  • Construction simulation method of gate head considering soft foundation consolidation and concrete creep

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Embodiment Construction

[0048] The present invention will be described in further detail below in conjunction with an example.

[0049] In this example, the concrete hydration heat adopts the formula See Table 1 for thermal calculation parameters.

[0050] Table 1 thermal parameters

[0051]

[0052] The modulus of elasticity of concrete is where E ∞ =34.25×10 6 kPa, a=0.28, b=0.52; the Poisson's ratio of concrete is 0.167; the formula of concrete creep is C(t,τ)=C a (1+9.2τ -0.45 )[1-e -0.3(t-τ) ]+C b (1+1.7τ -0.45 )[1-e -0.005(t-τ) ], where C a =6.39×10 -6 / MPa, C b =1.444×10 -5 / MPa.

[0053] In this example, the soft soil foundation is divided into 9 layers according to the engineering geological survey. The modified Cambridge consolidation model is used, and the Poisson's ratio of the soil is 0.3. See Table 2 for other calculation parameters.

[0054] Table 2 Elastoplastic consolidation parameters of soil

[0055]

[0056]

[0057]In this example, the angle-cut gate h...

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Abstract

The invention discloses a lock head construction emulation method considering soft foundation consolidation and concrete creep. The lock head construction emulation method comprises the steps of: 1, determining thermal parameters of concrete and a soft foundation, a creep calculation parameter of the concrete, a consolidation parameter of the foundation and an elastoplasticity mechanical parameter of the foundation; 2, establishing a finite element network of a lock head structure; 3, determining time steps of calculation, an initial temperature of the concrete and an equivalent heat emission coefficient of a concrete heat insulating measure; 4, according to the thermal parameters, a time-history analysis step, an initial condition and an air temperature, predicting and calculating a temperature field; 5, calculating a pore pressure and ground stress distribution of the excavated soft foundation; and 6, applying a temperature load, a foundation initial pore pressure, a ground stress of the foundation and other loads which need to be considered to carry out stress calculation. The method disclosed by the invention comprehensively considers a creep feature of the concrete and an elastoplasticity consolidation feature of the soft foundation, and can relatively perfectly predict a stress of the lock head structure in the construction period.

Description

technical field [0001] The invention relates to a stress analysis method which comprehensively considers soft foundation consolidation and concrete creep during the construction period of a gate head structure on a soft foundation in the concrete structure design of a water conservancy project. Background technique [0002] Inland water transport has the characteristics of large transport volume, low cost, high benefit, and little environmental pollution, and has played an important role in promoting the economic development of the river basin. Ship locks are the main navigable structures in water transport engineering. [0003] Although the concrete volume of the gate head is relatively small compared to other structures such as hydraulic dams, it still needs to be considered as a mass concrete structure. Especially the bottom plate, the general thickness reaches 2-3 meters, and most of them are poured in one time; the side piers are relatively small, but because of the th...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
CPCG06F30/13G06F30/23
Inventor 徐超苏超董义佳赵业斌
Owner HOHAI UNIV
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