CN102605738B - Method for monitoring change of internal force of resin mortar block during riverbed blowing up scouring period of hyper-concentration sediment flood - Google Patents

Method for monitoring change of internal force of resin mortar block during riverbed blowing up scouring period of hyper-concentration sediment flood Download PDF

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Publication number
CN102605738B
CN102605738B CN 201210063068 CN201210063068A CN102605738B CN 102605738 B CN102605738 B CN 102605738B CN 201210063068 CN201210063068 CN 201210063068 CN 201210063068 A CN201210063068 A CN 201210063068A CN 102605738 B CN102605738 B CN 102605738B
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China
Prior art keywords
clay piece
riverbed
mold box
point type
blowing
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CN 201210063068
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CN102605738A (en
Inventor
李军华
江恩慧
何鲜峰
曹永涛
董文胜
赵连军
郭西方
宁兵
颜小飞
张清
刘燕
万强
夏修杰
董其华
顾霜妹
赵新建
张杨
潘丽
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Hohai University HHU
Yellow River Conservancy Commission Yellow River Conservancy Research Institute
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Hohai University HHU
Yellow River Conservancy Commission Yellow River Conservancy Research Institute
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Abstract

The invention relates to a physical model with IPC (international patent classification) of E02B1/02, in particular to an analog monitoring method for a water flow turbulent fluctuation structure at the bottom of a resin mortar block during 'riverbed blowing up' scouring period of hyper-concentration sediment flood. The analog monitoring method includes prefabricating the resin mortar block by the aid of an organic glass mode box; arranging platy film type pressure sensors at the bottom of the resin mortar block; and leading a data line to be connected with a data acquisition instrument to acquiring water flow pressure signals in real time. In the analog monitoring method, the structure is simple, operation is convenient, a water flow turbulent fluctuation condition at the bottom of the resin mortar block is monitored accurately, a feasible testing method and a device are provided for further deeply researching the difficult problem of 'riverbed blowing up' phenomenon of the Yellow River, and the analog monitoring method lays the foundation for recognizing the occurrence mechanism of the 'riverbed blowing up' phenomenon and building a 'riverbed blowing up' scouring index, and provides important basis and reference for formulating a Yellow River flood control plan and planning and designing a flood prevention project.

Description

High sand-containing flood is taken off clay piece internal force change procedure monitoring method during the river bed
Technical field:
The present invention relates to a kind of monitoring method of hydraulic model test, its IPC international Patent classificating number is E02B1/02, particularly the internal force change procedure monitoring method of clay piece during uncovering, overturning in a kind of simulation high sand-containing flood process of " taking off the river bed ".
Background technology:
in the high river of silt content, such as in sections such as Xiao Bei master stream, the Yellow River and the Weihe River, under the high sand-containing flood effect, the riverbed tends to occur violent lumped scour, deposit through the regular period in early stage, precipitation, density is larger, " the clay layer " that intensity is higher, sometimes from bed surface by taken off lift and, rolled-up as volume " carpet ", become piece, surface in flakes, area can reach several square metres even tens square metres, then broken at short notice, collapse, broken up by current and take away, this phenomenon is also referred to as " taking off the river bed ", the Yellow River " one of endemism of hyper-concentration flow motion ".Phenomenon often causes the strong incision in riverbed " to take off the river bed ", and even, the riverbed once rushes dark several meters and even nearly ten meters." take off the river bed " and wash away and often cause migrating of river course major trough, engineering slip the position constantly to change, cause easily that river engineering is heavy stings, caves in, increase the complicacy of flood fighting in flood season; Particularly because the riverbed is significantly washed away, large stream stage descends, and causes the machine electric pumping station separation of flow along the river, badly influences littoral industrial and agricultural production.Since last century the seventies, this phenomenon just is subject to showing great attention to of domestic and international water conservancy working person, and carried out a large amount of research, for further being familiar with " taking off the river bed " phenomenon, people lay a good foundation, but the randomness due to the generation of " taking off the river bed " phenomenon, be difficult to record in practice stronger " taking off the river bed " field data of followability, the research of this problem also can only break through from test simulation.
Jiang Enhui etc. have proposed " high sediment concentration waterflood river bed tearing simulation test device ", and this technology has obtained china national practical new-type patent mandate (ZL 200920217654.4) in October, 2010, provide the foundation for carrying out " taking off the river bed " simulation test.In addition, also utilize the flyash of different gradation to simulate riverbed layering alluvial structure, clay piece when particularly utilizing impalpable powder coal ash simulation " taking off the river bed " to occur, based on " taking off the river bed " simulation test device, successfully simulated " taking off the river bed " phenomenon truly in flume test, " high sediment concentration waterflood river bed tearing simulation test method " of application also obtained national inventing patent mandate (ZL200910177288.9) in 2011.
Prototype measurement, live video and simulation laboratory test all show, " clay piece " uncovered, overturn, surfaced in process, sometimes the clay piece situation that can occur fractureing, can see also sometimes that " clay piece " uncovered in rear monoblock soil body slump water and can not ruptured is scattered.In order further to understand fully the whys and wherefores, the change procedure of clay piece internal force during must furtheing investigate the Yellow River high sand-containing flood and " taking off the river bed ".And at present, model itself can't be monitored the change procedure of " clay piece " stress own at all, and flume experiment and model test do not have the effective monitoring technology of cover and a method yet.The present invention is that the monitoring of clay piece internal force change procedure during the Yellow River high sand-containing flood " is taken off the river bed " provides the practicable monitoring device of cover and a method.
Summary of the invention:
This summary of the invention is at utility model patent " high sediment concentration waterflood river bed tearing simulation test device " (ZL200920217654.4) and on patent of invention " high sediment concentration waterflood river bed tearing simulation test method " (ZL 200910177288.9) basis, being uncovered, overturn, surface for " clay piece ", the change procedure of " clay piece " internal stress own carries out Real-Time Monitoring in process, and technical scheme of the present invention is:
A kind of high sand-containing flood is taken off the monitoring method of clay piece internal force change procedure during the river bed, comprises the following steps:
(1) make mold box
According to the different size of clay piece, make the organic glass mold box of a series of different sizes; Each fixes 1 steel bracket in the rear and front end of described mold box, slide bar of fixed placement on described steel bracket; The left and right sides and bottom at described mold box arrange a plurality of set bolts, in the front end perforating of described set bolt, and upper series high strength carbon fiber; A plurality of single-point type diaphragm pressure sensors are placed in mold box, the bottom of each described single-point type diaphragm pressure sensor and the left and right sides are fixed by the described high-strength carbon fiber that ties up on described set bolt, and top is fixed on described slide bar by high-strength carbon fiber.
(2) the clay piece is prefabricated
Adopt median particle diameter less than impalpable powder coal ash or the natural superfine sand of 0.01mm, put into a larger container, add water, with stirrer, it is stirred, making silt content is 800~1000kg/m 3Slurry, stand-by; Adjust described single-point type diaphragm pressure sensor, it is vertically stood up in the compressive region of clay piece; Strain 4 high-strength carbon fibers up and down on described single-point type diaphragm pressure sensor, make it firm; The data line that connects described single-point type diaphragm pressure sensor is drawn above the afterbody of described mold box; Described slurry is poured in mold box gradually, parked 12 hours, make it fixed, make the clay piece.
(3) pilot system is laid
Lay the rough sand layer on the coarse particle flyash simulation riverbed that median particle diameter is 0.05mm in the bottom of experimental tank, reserve the space of clay piece design size size on the rough sand layer of described simulation; The described clay piece that is connected with described single-point type diaphragm pressure sensor is put into headspace, described data line is connected with data collecting instrument.
(4) outflow test
Discharge water and test, be arranged in the clay piece described single-point type diaphragm pressure sensor to take off clay piece in the process of river bed before uncovering, mention during moment and upset the internal force of corresponding site and change and carry out Real-time Collection; Based on the real-time Internal Force Monitoring data of three sections, in conjunction with finite element theory and mathematical model, calculate clay piece inside three-dimensional pressurized, draw situation, generate the three-dimensional wave spectrogram that clay piece internal force changes.
High sand-containing flood of the present invention is taken off the monitoring method of clay piece internal force change procedure during the river bed, simple in structure, easy to operate, can be in real time, the inner STRESS VARIATION situation of monitor clay piece itself, this difficult problem of phenomenon provides feasible test method and device for the river bed " is taken off " in further further investigation the Yellow River, lay a good foundation for seeing clearly that " taking off the river bed " phenomenon genesis mechanism, foundation " are taken off the river bed " and washed away index, for formulating the planning and design of the Yellow River flood control forecasting and flood control engineering, provide important foundation and reference.
Description of drawings:
Fig. 1 is mold box front view of the present invention
Fig. 2 is mold box vertical view of the present invention
Fig. 3 is mold box side view of the present invention
Fig. 4 is the single-point type diaphragm pressure sensor schematic diagram that the present invention adopts
Fig. 5 is monitoring device schematic diagram of the present invention
In figure, 1 is mold box, and 2 is steel bracket, and 3 is slide bar, and 4 is high-strength carbon fiber, and 5 is the single-point type diaphragm pressure sensor, and 6 is coarse sands layer, and 7 is the clay piece, and 8 is data collecting instrument, and V is water (flow) direction, and d is clay piece thickness.
Embodiment:
High sand-containing flood of the present invention is taken off the monitoring method of clay piece internal force change procedure during the river bed, when specifically implementing, comprises the following steps:
(1) the particular manufacturing craft box is made
According to the different size of clay piece 7, design and produce the organic glass mold box 1 of a series of different sizes, as shown in Figure 1-Figure 3.Each fixes 1 steel bracket 2 mold box 1 both sides, and the above places a slide bar 3.5 (as shown in Figure 4) of single-point type diaphragm pressure sensor are adopted in test, design sensor distributing network figure, sensor 5 positions can be moved by slide bar 3. and the left and right sides of mold box 1 and bottom arrange a plurality of set bolts, the front end perforating, upper series high strength carbon fiber 4, each single-point type diaphragm pressure sensor 5 is by 4 high-strength carbon fibers 5 are fixing up and down, guarantee that each sensor 5 is arranged in the first half of mold box 1, make load cell 5 be in the compressive region of clay piece 7 fully, and vertically be fixed in the monitoring location of design, and stable.
(2) the clay piece is prefabricated
Utilizing median particle diameter to make silt content less than the impalpable powder coal ash of 0.01mm or natural sand is 800~1000kg/m 3Slurry, with stirrer, it is stirred, stand-by; Adjust single-point type thin film sensor 5, it is vertically stood up in the compressive region of clay piece 7; Tension is 4 high-strength carbon fibers 5 up and down, make it firm; The data line that connects single-point type thin film sensor 5 is drawn above the afterbody of mold box 1; Pour gradually the slurry that stirs into mold box 1 li, parked 12 hours, make it fixed, make clay piece 7.
(3) pilot system is laid
Reach " high sediment concentration waterflood river bed tearing simulation test method " according to " high sediment concentration waterflood river bed tearing simulation test device ", the bottom of gullet laying depth be coarse particle flyash (median particle diameter is about 0.05mm) more than 15cm with the rough sand layer 6 of simulation on the riverbed, reserve the space of clay piece 7 design size sizes on rough sand layer 6; The pre-prepared colloid clod 7 that is connected with pressure transducer 5 is put into headspace, data line direct be connected with data acquisition unit 8 (as shown in Figure 5).
(4) outflow test
Discharge water and test, be arranged in single-point type thin-film pressure sensor 5 in clay piece 7 can be to clay piece in " taking off the river bed " process before uncovering, mention during moment and upset the internal force of corresponding site and change and carry out Real-time Collection; Based on the real-time Internal Force Monitoring data of three sections, in conjunction with computational tools such as finite element theory and mathematical models, calculate clay piece 7 whole interior three-dimensional pressurized, draw situation, generate the three-dimensional wave spectrogram that clay piece internal force changes.

Claims (1)

1. a high sand-containing flood is taken off the monitoring method of clay piece internal force change procedure during the river bed, comprises the following steps:
(1) make mold box
According to the different size of clay piece, make the organic glass mold box of a series of different sizes; Each fixes 1 steel bracket in the rear and front end of described mold box, slide bar of fixed placement on described steel bracket; The left and right sides and bottom at described mold box arrange a plurality of set bolts, in the front end perforating of described set bolt, and upper series high strength carbon fiber; A plurality of single-point type diaphragm pressure sensors are placed in mold box, the bottom of each described single-point type diaphragm pressure sensor and the left and right sides are fixed by the described high-strength carbon fiber that ties up on described set bolt, and top is fixed on described slide bar by high-strength carbon fiber;
(2) the clay piece is prefabricated
Adopt median particle diameter less than impalpable powder coal ash or the natural superfine sand of 0.01mm, put into a larger container, add water, with stirrer, it is stirred, making silt content is 800~1000kg/m 3Slurry, stand-by; Adjust described single-point type diaphragm pressure sensor, it is vertically stood up in the compressive region of clay piece; Strain 4 high-strength carbon fibers up and down on described single-point type diaphragm pressure sensor, make it firm; The data line that connects described single-point type diaphragm pressure sensor is drawn above the afterbody of described mold box; Described slurry is poured in mold box gradually, parked 12 hours, make it fixed, make the clay piece;
(3) pilot system is laid
Lay the rough sand layer on the coarse particle flyash simulation riverbed that median particle diameter is 0.05mm in the bottom of experimental tank, reserve the space of clay piece design size size on the rough sand layer of described simulation; The described clay piece that is connected with described single-point type diaphragm pressure sensor is put into headspace, described data line is connected with data collecting instrument;
(4) outflow test
Discharge water and test, be arranged in the clay piece described single-point type diaphragm pressure sensor to take off clay piece in the process of river bed before uncovering, mention during moment and upset the internal force of corresponding site and change and carry out Real-time Collection; Based on the real-time Internal Force Monitoring data of three sections, in conjunction with finite element theory and mathematical model, calculate clay piece inside three-dimensional pressurized, draw situation, generate the three-dimensional wave spectrogram that clay piece internal force changes.
CN 201210063068 2012-01-13 2012-01-13 Method for monitoring change of internal force of resin mortar block during riverbed blowing up scouring period of hyper-concentration sediment flood Expired - Fee Related CN102605738B (en)

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CN103422461B (en) * 2013-07-17 2015-06-10 华北水利水电大学 Method for judging 'bottom tearing' scour caused by hyper-concentration floods
CN103422460B (en) * 2013-07-17 2015-06-10 华北水利水电大学 Method for comprehensively distinguishing high-sand-content flood river-bottom-tearing washing critical conditions
CN103437317B (en) * 2013-08-16 2015-09-02 天津虹炎科技有限公司 High sand-containing flood " is taken off river bed " and is washed away critical condition comprehensive distinguishing method
CN103388320B (en) * 2013-08-16 2015-04-15 天津虹炎科技有限公司 Washing judging method for river bottom uncovering of high-sandiness flood
CN110485363B (en) * 2019-08-31 2020-11-20 华北水利水电大学 Simulation device for dynamic change of riverbed under flood action and multipoint real-time monitoring method

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JPH0211095B2 (en) * 1984-06-25 1990-03-12 Matsushita Electric Works Ltd
DE10050985A1 (en) * 2000-10-16 2002-05-16 Ima Kunststofftechnik Gmbh Flow simulation unit for fluids, comprises at least one flow channel, with barrier sections formed from a two dimensional deformable material
CN101074899B (en) * 2006-05-19 2010-05-12 河海大学 Method for determining runway lawn slope impact-resistance
CN101713175B (en) * 2009-09-29 2011-05-25 黄河水利委员会黄河水利科学研究院 High sediment concentration waterflood river bed tearing simulation test method

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