CN107133434A - A kind of computational methods of mud-rock flow critical size concentration - Google Patents
A kind of computational methods of mud-rock flow critical size concentration Download PDFInfo
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Abstract
The invention discloses a kind of computational methods of mud-rock flow critical size concentration, this method determines the mud-rock flow solid unit weight γ of earthquake region debris flow gully by the field investigation means of earthquake region debris flow gullyS, the unit weight γ of water bodyW, mud-rock flow fall of channel α, mud-rock flow raceway groove longitudinal river slope J, mud-rock flow raceway groove roughness coefficien n, the internal friction angle θ of mud-rock flow raceway groove deposit, mud-rock flow flow depth H, the coefficient of viscosity η of mud-rock flow；Bring the parameter obtained into calculation formula, the mud-rock flow critical size concentration of Debris flow initiation process can be obtained, this method is applied to earthquake region mud-rock flow volume concentration prediction.Compared with prior art, the present invention can more accurately obtain the situation of change of earthquake region mud-rock flow volumetric concentration, the design for earthquake region debris flow control works provides foundation based on tight theory deduction, and it can meet prevention of geological disaster needs with simple, efficient.
Description
Technical field
The invention belongs to debris flow control works design applied technical field, more particularly to a kind of mud-rock flow critical size is dense
The computational methods of degree.
Background technology
Mud-rock flow is mainly made up of the solid, liquid two-phase such as water body and solid particle, i.e., the volumetric concentration of mud-rock flow is main by mud
In rock glacier body the percentage composition of solid particle and its solid particle level with etc. together decide on, and silt particle start maximum solid
The unit weight relation of Granule Computing formula and volumetric concentration and mud-rock flow, when the volumetric concentration C of mud-rock flow is more than limiting volume concentration CC
When, then debris flow erosion raceway groove deposit.Therefore, the volumetric concentration of meizoseismal area mud-rock flow is characterized in the research weight of debris flow
Point.
The factor phases such as the roughness of the volumetric concentration variation characteristic of mud-rock flow and raceway groove longitudinal river slope, debris flow velocity and raceway groove
Close.Mud-rock flow volumetric concentration not only reflects the solid matter erosional features during Debris flow initiation, and reflects erosion
Start the fluid properties of the rainwash of mud-rock flow raceway groove deposit.Mud-rock flow volumetric concentration is also the indicator ginseng of mud-rock flow unit weight
One of number, major parameter of dynamics of debris flow property.The volumetric concentration of any flow depth of mud-rock flow is differed, mud-rock flow
Volumetric concentration is in continuous function relation with its flow depth, flow velocity.For example, during " 7.10 " extra torrential rain in 2013, mountain behind 1 group of sheep shop
Mud-rock flow occurs for 3 raceway grooves of Debris Flow on Slope Surface, and the mudstone during breaking out is respectively obtained by live method of completing the square and look-up table
It is 58% and 43.6% to flow volumetric concentration, during obtaining debris flow occurrence by sticking grain percentage composition and coarse granule percentage composition
Volumetric concentration be about 41.2%.Cattle pen ditch occurs extensive during " 926 " big floods in 2008 and " 814 " big flood in 2010
Mud-rock flow, wherein the material resource amount corroded is respectively 17.15 × 104m3With 14.87 × 104m3, cattle pen gully mud-rock flow bulk solids thing
In source based on shiver stone, the mud-rock flow volumetric concentration during being broken out by live method of completing the square is 47.3%, by glutinous
Volumetric concentration during the debris flow occurrence that grain percentage composition and coarse granule percentage composition are obtained is about 38.8%.
The volumetric concentration of mud-rock flow reflects the physical features of mud-rock flow fluid, and mud-rock flow solid content reflects mud
Fluid concentrations of the rock glacier during starting, breaking out；Existing mud-rock flow volumetric concentration is mainly taken by lab and field
Sample is obtained, and its emphasis point is to study percentage composition feature of the mud-rock flow solid particle in debris flow body.Based on debris flow gully
The critical size concentration model energy quick obtaining volumetric concentration parameter of road section parameter and mud-rock flow raceway groove deposit physical property,
In earthquake region, the use energy of debris flow is efficient, be easily generalized to designing unit and production unit.
The content of the invention
It is an object of the invention to：For above-mentioned problem, there is provided a kind of calculating of mud-rock flow critical size concentration
Method, solves raceway groove longitudinal river slope and mud-rock flow flow depth and the critical body of mud-rock flow in the mud-rock flow raceway groove deposit starting process of meizoseismal area
The relation of product concentration, builds the mud-rock flow critical size concentration prediction mould based on mud-rock flow flow depth and raceway groove deposit physical property
Type, and example utilization is carried out, provide new method for earthquake region debris flow, it is adaptable to the need for debris flow Practical Project.
The technical scheme implementation of the technology of the present invention：A kind of computational methods of mud-rock flow critical size concentration, its feature
It is：The physical property of the channel features of earthquake region mud-rock flow and mud-rock flow raceway groove deposit is applied to earthquake region Debris flow initiation mistake
The critical size concentration prediction of journey, its circular is as follows：
A. by obtaining the parameter of earthquake region mud-rock flow raceway groove, the fall of channel α of debris flow gully, the vertical ratio of mud-rock flow raceway groove are determined
J, mud-rock flow raceway groove deposit unit weight γ dropS, the unit weight γ of debris flow body reclaimed waterW, the internal friction angle θ of mud-rock flow raceway groove deposit,
Mud-rock flow flow depth H, the roughness coefficien n of mud-rock flow raceway groove, the coefficient of viscosity η of mud-rock flow；
B. the critical size concentration during Debris flow initiation of earthquake region is determined by below equation, unit %,
In formula, α is the fall of channel (°) of debris flow gully, and J is mud-rock flow raceway groove longitudinal river slope (‰), γSFor mud-rock flow raceway groove
Deposit unit weight (KN/m3), γWFor the unit weight (KN/m of debris flow body reclaimed water3), θ is the internal friction angle of mud-rock flow raceway groove deposit
(°), H is mud-rock flow flow depth (m), and n is the roughness coefficien of mud-rock flow raceway groove, and η is the coefficient of viscosity (Pas) of mud-rock flow；By
Step A is determined.
Earthquake region mud-rock flow is determined in the computational methods of mud-rock flow critical size concentration of the present invention, its described step B
The formula of critical size concentration during starting is applied to the critical size concentration prediction during the Debris flow initiation of earthquake region, will obtain
Mud-rock flow volumetric concentration as earthquake region debris flow minimum mud-rock flow volume concentration parameter.
Compared with prior art, the beneficial effects of the invention are as follows：The present invention breaks through the limitation of Conventional wisdom, from debris flow gully
The many-sides such as road longitudinal river slope, mud-rock flow channel width are started with, and construct the mud-rock flow volumetric concentration based on mud-rock flow raceway groove parameter
Computation model.First, in terms of mud-rock flow raceway groove longitudinal river slope, earthquake region mud-rock flow raceway groove longitudinal river slope change is taken into full account, mud is utilized
Rock glacier raceway groove longitudinal river slope variation characteristic quantitative response earthquake region mud-rock flow terrain slope feature；Secondly, based on Wenchuan earthquake region mudstone
The physical property of raceway groove deposit is flowed, earthquake region mud-rock flow raceway groove deposit is reflected according to the stress balance equation of mud-rock flow fluid
The correlation between critical size concentration and raceway groove cross section during starting, computational theory is perfect, and result of calculation meets mud-rock flow
Field investigation, can provide technical support for earthquake region debris flow.
Brief description of the drawings
Fig. 1 is mud-rock flow raceway groove deposit force analysis schematic diagram.
Label is as follows in figure：△ h are any corroding thickness of raceway groove deposit, and △ l are that deposit arbitrarily corrodes length, and h is
Debris Flow Deposition thickness, H is mud-rock flow flow depth, and α is mud-rock flow fall of channel, and dN is bearing stress, dG suffered by depositYFor mud
The weight stress of rock glacier solid particle, dτThe shear stress suffered by deposit.
Embodiment
Below in conjunction with the accompanying drawings, the present invention is described in detail.
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The technology of the present invention is further elaborated.It should be appreciated that specific embodiment described herein is only to explain the present invention,
It is not used to limit invention.
A kind of computational methods of mud-rock flow critical size concentration, its main thought is：By the channel features of earthquake region mud-rock flow
The critical size concentration prediction of earthquake region Debris flow initiation process is applied to the physical property of mud-rock flow raceway groove deposit.Preferred root
Mud-rock flow flow depth during mud-rock flow movement is derived according to the stress characteristic of mud-rock flow raceway groove deposit；The mud broken out again by earthquake region
The means such as the investigation of rock glacier ditch and the measurement of mud-rock flow raceway groove characteristic parameter determine that mud-rock flow flow depth, fall of channel, raceway groove are indulged
Than drop, mud-rock flow raceway groove roughness coefficien, mud-rock flow raceway groove deposit internal friction angle；Bring parameters obtained into earthquake region mud-rock flow critical
In volumetric concentration computation model, volumetric concentration predicted value when mud-rock flow raceway groove deposit is started is obtained.
Its circular and step are as follows：
First, the stress balance according to mud-rock flow raceway groove deposit in rainwash, analyzes mud-rock flow raceway groove deposit
Driving force condition and resistance condition in starting process.Assuming that earthquake region mud-rock flow raceway groove longitudinal river slope is J, fall of channel is α, mudstone
Stream flow depth is H, the internal friction angle θ of mud-rock flow raceway groove deposit, the coefficient of viscosity η of mud-rock flow, and mud-rock flow raceway groove deposit is started
When unit weight γS, the unit weight γ of debris flow body reclaimed waterW.Weight stress that mud-rock flow solid particle is subject to, floating stress, viscous force are public
Formula is expressed as knowable to the critical condition that the flow depth based on earthquake region mud-rock flow is started, the stream of mud-rock flow difference corroding thickness and mud-rock flow
It is deep closely related.Stress balance formula when earthquake region mud-rock flow raceway groove deposit is started is expressed as：
In formula, α is the fall of channel (°) of debris flow gully, and γ is mud-rock flow raceway groove deposit unit weight (KN/m3), γWFor mud
Unit weight (the KN/m of rock glacier body reclaimed water3), mud-rock flow saturated unit weight is γsat(KN/m3), θ rubs for the interior of mud-rock flow raceway groove deposit
Wipe angle (°), H is mud-rock flow flow depth (m), n is the roughness coefficien of mud-rock flow raceway groove, and η is the coefficient of viscosity (Pas) of mud-rock flow, J
For mud-rock flow raceway groove longitudinal river slope (‰).
Then, because the fall of channel of mud-rock flow and the internal friction angle of mud-rock flow material resource are definite value, earthquake region mud-rock flow rises
The formula of volumetric concentration when dynamic is expressed as：
In formula, symbol is with shown on.
Wherein, determine that the formula of the critical size concentration during Debris flow initiation of earthquake region is applied to earthquake region mud in the step B
Critical size concentration prediction in rock glacier starting process, using obtained mud-rock flow volumetric concentration as earthquake region debris flow most
Small mud-rock flow volume concentration parameter.
It is below the specific embodiment of the present invention：
Small hilllock sword basin catchment area is 0.61km2, the raceway groove longitudinal river slope for forming Circulation Area is 506 ‰.According to small hilllock sword
The basin remote sensing analysis of debris flow gully, the basin entirety gradient is in mean inclination more than 30 °, and part is more than 50 °.Debris flow gully
The road gradient in mean inclination more than 30 °, and flowing area of mud flow downstream Dou Kan positions the gradient more than 50 °.
For effectively preventing and improvement mud-rock flow, prevent remote river is blocked from threatening downstream security, according to debris flow gully
The feature such as road and debris dam design width is effectively predicted that circular and step are as follows：
A. according to the field investigation of small hilllock sword debris flow gully and mud-rock flow raceway groove parameter testing, it is determined that small hilllock sword ditch 1# is blocked
The average mud depth 0.73m on sand dam, mud-rock flow raceway groove deposit solid unit weight is 26.6 (KN/m3), the coefficient of viscosity is 1.005
(Pas), mud-rock flow longitudinal river slope 483 ‰, roughness coefficien 12,33 ° of the internal friction angle of mud-rock flow raceway groove deposit.
B. each parameter step A determined substitutes into lower formula,
C. it is 3.9% to be calculated by formula and obtain critical size concentration in mud-rock flow raceway groove deposit starting process, then small
Volumetric concentration when hilllock sword mud-rock flow 1# debris dam prevention and cure projects position mud-rock flow raceway groove deposit is started is 3.9%.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
Any modifications, equivalent substitutions and improvements made within refreshing and principle etc., should be included in the scope of the protection.
Claims (2)
1. a kind of computational methods of mud-rock flow critical size concentration, it is characterised in that：By the channel features and mud of earthquake region mud-rock flow
The physical property of rock glacier raceway groove deposit is applied to the critical size concentration prediction of earthquake region Debris flow initiation process, its specific calculating
Method is as follows：
A. by obtaining the parameter of earthquake region mud-rock flow raceway groove, the fall of channel α of debris flow gully, mud-rock flow raceway groove longitudinal river slope J are determined,
Mud-rock flow raceway groove deposit unit weight γS, the unit weight γ of debris flow body reclaimed waterS, the internal friction angle θ of mud-rock flow raceway groove deposit, mudstone
Flow flow depth H, the roughness coefficien n of mud-rock flow raceway groove, the coefficient of viscosity η of mud-rock flow；
B. the critical size concentration during Debris flow initiation of earthquake region is determined by below equation, unit %,
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In formula, α is the fall of channel (°) of debris flow gully, and J is mud-rock flow raceway groove longitudinal river slope (‰), γSAccumulated for mud-rock flow raceway groove
Thing unit weight (KN/m3), γWFor the unit weight (KN/m of debris flow body reclaimed water3), θ is the internal friction angle (°) of mud-rock flow raceway groove deposit,
H is mud-rock flow flow depth (m), and n is the roughness coefficien of mud-rock flow raceway groove, and η is the coefficient of viscosity (Pas) of mud-rock flow；By step A
Determined.
2. the computational methods of mud-rock flow critical size concentration according to claim 1, it is characterised in that：In the step B
Determine that the formula of the critical size concentration during Debris flow initiation of earthquake region is applied to the critical size during the Debris flow initiation of earthquake region
Concentration prediction, using obtained mud-rock flow volumetric concentration as earthquake region debris flow minimum mud-rock flow volume concentration parameter.
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Cited By (5)
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| CN107391924A (en) * | 2017-07-19 | 2017-11-24 | 四川建筑职业技术学院 | A kind of earthquake region mud-rock flow unit weight computational methods based on mud-rock flow material resource particle size parameters |
| CN108021764A (en) * | 2017-12-15 | 2018-05-11 | 四川建筑职业技术学院 | A kind of glacial mud-rock flow starts the computational methods of flow depth |
| CN110147394A (en) * | 2019-05-25 | 2019-08-20 | 成都理工大学 | A kind of mud-rock flow a century deposit depth prediction technique based on statistical method |
| CN110472183A (en) * | 2019-08-21 | 2019-11-19 | 中国地质科学院探矿工艺研究所 | A kind of mud-rock flow bulk density calculation method based on disaster temporal-spatial evolution |
| CN110532683A (en) * | 2019-08-28 | 2019-12-03 | 四川建筑职业技术学院 | A kind of mud-rock flow bulk density calculation method based on channel flow depth, compression |
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| CN107391924A (en) * | 2017-07-19 | 2017-11-24 | 四川建筑职业技术学院 | A kind of earthquake region mud-rock flow unit weight computational methods based on mud-rock flow material resource particle size parameters |
| CN107391924B (en) * | 2017-07-19 | 2020-08-04 | 四川建筑职业技术学院 | Seismic region debris flow volume weight calculation method based on debris flow source particle size parameters |
| CN108021764A (en) * | 2017-12-15 | 2018-05-11 | 四川建筑职业技术学院 | A kind of glacial mud-rock flow starts the computational methods of flow depth |
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| CN110147394A (en) * | 2019-05-25 | 2019-08-20 | 成都理工大学 | A kind of mud-rock flow a century deposit depth prediction technique based on statistical method |
| CN110147394B (en) * | 2019-05-25 | 2022-06-21 | 成都理工大学 | Statistical method-based method for predicting hundred-year siltation depth of debris flow |
| CN110472183A (en) * | 2019-08-21 | 2019-11-19 | 中国地质科学院探矿工艺研究所 | A kind of mud-rock flow bulk density calculation method based on disaster temporal-spatial evolution |
| CN110472183B (en) * | 2019-08-21 | 2022-04-05 | 中国地质科学院探矿工艺研究所 | Debris flow volume weight calculation method based on disaster spatiotemporal evolution |
| CN110532683A (en) * | 2019-08-28 | 2019-12-03 | 四川建筑职业技术学院 | A kind of mud-rock flow bulk density calculation method based on channel flow depth, compression |
| CN110532683B (en) * | 2019-08-28 | 2023-03-10 | 四川建筑职业技术学院 | Debris flow volume weight calculation method based on channel flow depth and compressive stress |
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