Test method of water for vegetation growth in seepage tunnels with multi-void composite media
A multi-void and water testing technology, applied to measuring devices, instruments, etc., can solve the problem of failure to reflect the characteristics of natural geological body void combination, failure to reflect the multi-void combination characteristics of natural complex geological bodies, spatial gradient of permeability characteristics, and rainfall spatiotemporal dynamics effects, ignoring the effects of plant growth, etc.
Active Publication Date: 2017-06-30
SICHUAN UNIV
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Problems solved by technology
The existing tunnel seepage balance theory and model boundaries do not reflect the multi-void combination characteristics of natural complex geological bodies, the spatial gradient of seepage characteristics, and the influence of rainfall spatiotemporal dynamics
At present, single pore flow, fracture flow or dissolved pore flow is used to describe the seepage characteristics of rock and soil, which fails to reflect the complex pore combination characteristics of natural geological bodies
[0005] The existing calculation method of water demand for vegetation growth is based on the empirical relationship established by the field test results of crops, which has its limitations; the existing physical model test technology for plant growth does not consider the impact of underground cavern seepage on plant ecological functions , there must be a certain gap with the actual situation
In the ecological impact assessment of existing tunnel projects, most of them ignore the influence of underground cavern seepage on plant growth, and there is no precedent for quantitative research on the relationship between the two
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[0060] Select the test site, and according to the principle of similarity, make 8 test models with the structures mentioned above, in which the slope α of the slope model is 30°, 20°, 10°, 5°, 30°, 20°, 10°, 5°. The models are arranged in two rows in axisymmetric arrangement, and the size of a single model is width×minimum height×tunnel axial depth=150cm×50cm×20cm. A single model is divided into 5 parts, each part width × minimum height × tunnel axial depth = 30cm × 50cm × 20cm, the thickness of the covering soil layer of each part is 5cm, 10cm, 20cm, 30cm, 40cm, in each part Spread the grass seeds evenly on the ground and plant the selected plants, for example, arrange the axis relative to the model, and plant the plants with ginkgo on one side and Chinese pine on the other.
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The invention relates to the technical field of simulation testing of ecological environment geotechnical engineering, and discloses a method for testing water for growth of vegetation in tunnel seepage with multi-void composite media, including designing and manufacturing a plant planting model, a rainfall simulation device, and a tunnel seepage model. The tunnel seepage model includes a model The boundary and the simulated seepage geological material filled in it, the simulated seepage geological material adopts the multi-void composite medium with equivalent seepage characteristics to the natural rock mass, the simulated seepage geological material is equipped with a tunnel simulation device, and the plant planting model is the same as the tunnel seepage model A slope model with matching size is set on the tunnel seepage model. Vegetation is planted on the slope model to simulate rainfall. The slope runoff of the slope model is collected in the sump corresponding to the lower end of the slope model, and the seepage collection device of the tunnel seepage model collects the tunnel The seepage model is used to test the water consumption of vegetation growth to study the relationship between rainfall, surface runoff, tunnel seepage and plant ecological growth water demand.
Description
technical field [0001] The present invention relates to the simulation of groundwater infiltration environment in the area affected by tunnel excavation and the test method for the water used for the growth of surface vegetation, especially a method for experimentally studying the hydraulic relationship between surface runoff generated by rainfall in the area affected by tunnel excavation, seepage of groundwater, and water demand for ecological growth of vegetation Methods. Background technique [0002] Water plays a pivotal role in the ecosystem, runs through the atmosphere-vegetation-soil-rock system, and is the medium of material inheritance and energy transportation. [0003] The groundwater balance in the watershed is the basis for maintaining the ecological functions of the vegetation in the area. The construction of underground caverns such as deep-buried long tunnels faces a series of scientific and technological problems: the relationship between precipitation, vege...
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IPC IPC(8): G01D21/00
Inventor 雷孝章符文熹赵敏王蕾
Owner SICHUAN UNIV