CN111125863B - Hydraulic punching pulping proportioning method for mucky soil - Google Patents
Hydraulic punching pulping proportioning method for mucky soil Download PDFInfo
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- CN111125863B CN111125863B CN201910939428.5A CN201910939428A CN111125863B CN 111125863 B CN111125863 B CN 111125863B CN 201910939428 A CN201910939428 A CN 201910939428A CN 111125863 B CN111125863 B CN 111125863B
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- 239000002689 soil Substances 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000004537 pulping Methods 0.000 title claims abstract description 17
- 238000004080 punching Methods 0.000 title claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 68
- 239000002002 slurry Substances 0.000 claims abstract description 29
- 238000011010 flushing procedure Methods 0.000 claims description 16
- 239000002245 particle Substances 0.000 claims description 11
- 230000005484 gravity Effects 0.000 claims description 8
- 239000010802 sludge Substances 0.000 claims description 7
- 239000008239 natural water Substances 0.000 claims description 6
- 238000012216 screening Methods 0.000 claims description 3
- 239000011800 void material Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 3
- 238000010276 construction Methods 0.000 description 7
- 238000009412 basement excavation Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The invention discloses a hydraulic punching pulping proportioning method for mucky soil, which uses a high-pressure water gun to carry out hydraulic punching on the mucky soil, and rapidly increases the water content of the mucky soil, so that the slurry under the condition of the water content reaches a critical flow velocity state during conveying, and the hydraulic punching working efficiency is optimized. The invention fully utilizes the optimal control of the initial state of the mucky soil to the critical flow rate, and achieves the effect of greatly reducing the loss of a transportation machine and the slurry conveying time. Simple process and low cost, and is suitable for engineering practice.
Description
Technical Field
The invention relates to the field of hydraulic punching pulping proportion construction, in particular to a method for determining a hydraulic punching pulping proportion of mucky soil.
Background
The hydraulic flushing is a new type of foundation pit digging mode, its construction principle is to simulate the water flow flushing phenomenon in nature, finish the construction operation of earthwork by means of hydraulic action, the water flow is pressurized by high-pressure pump, conveyed by water pipe, and jet a dense high-pressure, high-speed column water flow by water gun, cut and crush the soil body to be excavated, make it wet and disintegrate, form mud, and then conveyed to the spoil area by mud pump and its mud conveying pipeline.
Under the normal condition, earth excavation is carried out on a foundation pit of a high-rise building, and methods such as manual excavation, mechanical excavation, manual mechanical cooperation and the like are usually adopted, so that the conventional excavation method has long construction period and low efficiency; in addition, the excavated soil body is transported by adopting a traditional muck truck, so that the problem of urban environmental pollution can be caused, the muck truck transportation is also often controlled temporarily, the soil outlet is difficult, and the construction period is influenced. The hydraulic flushing technology can effectively avoid the problems, has the advantages of short construction period, less noise, less pollution and the like, is green and ecological, and meets the requirements of ecological civilization construction and green development.
In the slurry conveying process, increasing the water content of the slurry to increase the flow rate of the pipeline has obvious effect on improving the pipeline conveying efficiency, however, the excessive water content inevitably causes the increase of the slurry conveying time and the waste of resources, but too low flow rate can cause the deposition of the sludge to block the pipeline. Therefore, the water content of the slurry needs to be reasonably controlled so as to achieve the economic flow rate with the highest conveying efficiency. The flow rate is generally slightly larger than the critical flow rate, and the critical flow rate is one of the most important parameters in the hydraulic pipeline conveying process, and is directly related to the safety reliability and the economical practicability of the pipeline operation.
Disclosure of Invention
The invention aims to provide a hydraulic flushing pulping proportioning method of mucky soil, which solves the problems of low efficiency of a mud pump caused by too thin mud and blockage of a mud pump pipeline caused by too thick mud after the existing hydraulic flushing pulping, and realizes the optimization of hydraulic flushing working efficiency.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the invention provides a hydraulic flushing pulping proportioning method for mucky soil, which comprises the following specific steps:
step one, measuring the specific gravity d of the mucky soil by an indoor test s ；
Step two, performing a particle screening test to obtain grading, and obtaining particle diameter d when the particle content smaller than the preset particle diameter is 85% 85 ；
Step three, obtaining the volume concentration C of the slurry in the E.J. gas general formula from the step one and the step two v Density ρ of mud k The method comprises the steps of carrying out a first treatment on the surface of the The e.j. gas general formula is:
wherein: v (V) C Represents a critical flow rate; d represents the diameter of a mud pump pipeline; ρ g Represents the natural density of the mucky soil;
wherein,,
w 0 the natural water content of the original mucky soil is obtained, and w is the water content of the slurry after water addition;
step four, obtaining a critical flow velocity V taking the water content w as a variable according to an E.J. gas general formula C ，
Step five, obtaining the time t required by the output of the water content w of each cubic meter of sludge at the critical flow rate,
and step six, calculating a relation curve of time and water content through matlab, finding an optimal point to obtain the optimal water content, wherein the time required for outputting slurry obtained after flushing per cubic meter of sludge at the optimal point at a critical flow rate is minimum, and the water content is the optimal water content.
Furthermore, the hydraulic flushing pulping proportioning method for the mucky soil provided by the invention has the advantages that the diameter of a mud pump pipeline is 15cm,20cm,30cm or 35cm.
Furthermore, the invention provides a hydraulic punching pulping proportioning method for mucky soil, wherein the specific gravity d is as follows s Taking an average value of 2.72; step d 85 ＝0.033mm。
Furthermore, the hydraulic punching pulping proportioning method for the mucky soil provided by the invention has the following basic physical and mechanical property indexes:
natural water content w 0 =31.7 to 41.3%, specific gravity d s =2.71 to 2.74, severe γ=16.7 to 18.3kN/m 3 Void ratio e 0 =0.95 to 1.2, limit w L =31.5 to 41.9, plastic limit w p ＝20.3～27.2；
Wherein, for the mucky soil with the water content of 31.7%, each cubic meter of soil is sprayed by a high-pressure water gun for 0.78m 3 For a mucky soil with a water content of 41.3%, each cubic meter of soil was sprayed with a high-pressure water gun at 0.29m 3 The water content of the slurry is made to reach 94% and 61.4% respectively, the water content of the mucky soil is between 31.7% and 41.3%, and the water quantity required to be injected is calculated by a linear interpolation method.
The beneficial effects of the invention are as follows:
the method for determining the hydraulic flushing mud proportion of the mucky soil is simple, scientific and high in feasibility. The method can effectively solve the problems of low engineering efficiency caused by too thin slurry or high abrasion of the slurry pump and high machine energy consumption caused by too thick slurry when the slurry pump outputs slurry outwards due to uncertain water output of the conventional high-pressure water gun. The hydraulic flushing technology has positive pushing effect on the development of the hydraulic flushing technology, and the reasonable mud proportion avoids unnecessary waste of water and electricity, is energy-saving and environment-friendly, and has obvious technical and economic benefits and social benefits.
Drawings
Fig. 1 is a graph of grading of certain mucky soils in south tokyo.
Fig. 2 is a graph of slurry water content versus output time for a mucky soil having an initial water content of 31.7% at a critical flow rate.
FIG. 3 is a close-up plot of mud water content versus output time for a mucky soil having an initial water content of 31.7% at a critical flow rate.
Fig. 4 is a graph of slurry water content versus output time for a mucky soil having an initial water content of 41.3% at a critical flow rate.
Detailed Description
The technical scheme of the invention is further specifically described below with reference to the accompanying drawings.
The invention aims at hydraulic flushing and pulping of mucky soil, and each cubic meter of soil is sprayed with a certain amount of water by a high-pressure water gun to enable the slurry to reach a critical flow velocity state.
The critical flow rate is an economic speed capable of reducing the energy consumption of transportation and improving the transportation efficiency, and is obtained by adopting an E.J. gas general formula. The e.j. gas general formula is:
wherein: v (V) C -critical flow rate (m/s);
C v -slurry volume concentration (%);
d, diameter (m) of a mud pump pipeline;
ρ g natural density of mucky soil (g/cm) 3 )；
ρ k Slurry density g/cm 3 ；
d 85 -a particle size (m) with a particle content of 85% smaller than this size.
The invention provides a determination method of hydraulic flushing pulping proportion aiming at mucky soil within a certain physical index range, wherein the physical indexes of the mucky soil are as follows:
natural water content w 0 =31.7 to 41.3%, specific gravity d s =2.71 to 2.74, the severe γ=16.78 to 18.34kN/m 3 Void ratio e 0 =0.956 to 1.21, limit w L =31.5 to 41.9, plastic limit w p ＝20.3～27.2；
The hydraulic punching pulping ratio determining method comprises the following specific steps:
step one, determining the specific gravity d of the mucky soil by means of an in-house test s The invention takes an average value of 2.72;
step two, performing a particle screening test to obtain the grading, wherein a grading graph is shown in figure 1 to obtain d 85 ＝0.033mm；
Step three, the step one and the step two can obtain C in the E.J. gas general formula v 、ρ k ；
Wherein,,
w 0 the natural water content of the original mucky soil is obtained, and w is the water content of the slurry after water addition;
step four, obtaining a critical flow velocity V taking the water content w as a variable according to an E.J. gas general formula C ；
Step five, obtaining the time t required by the output of the water content w of each cubic meter of sludge at the critical flow rate,
step six, calculating a relation curve of time and water content through matlab, finding an optimal point to obtain the optimal water content, wherein the time required for outputting slurry obtained after flushing every cubic meter of sludge at the point at a critical flow rate is minimum, and the water content is the optimal water content;
the diameter of a conveying pipeline of the slurry pump is 15cm,20cm,30cm and 35cm;
referring to FIGS. 2 to 4, it is known from the calculation that for the muddy soil having a water content of 31.7%, the high-pressure water gun is used to shoot 0.78m per cubic meter of soil 3 About water, for mucky soil with a water content of 41.3%, water is sprayed at a high pressure by a water gun at a depth of 0.29m per cubic meter 3 The water content of the slurry reaches 94% and 61.4% respectively.
The amount of water to be flushed for a mucky soil having an as-produced moisture content of between 31.7% and 41.3% can be calculated using linear interpolation.
The technical features of the present invention that are not described in the present invention may be implemented by or using the prior art, and are not described in detail herein, but the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, but is also intended to be within the scope of the present invention by those skilled in the art.
Claims (4)
1. The hydraulic punching pulping proportioning method for the mucky soil is characterized by comprising the following specific steps of:
step one, measuring the specific gravity d of the mucky soil by an indoor test s ；
Step two, performing a particle screening test to obtain grading, and obtaining particle diameter d when the particle content smaller than the preset particle diameter is 85% 85 ；
Step three, obtaining the volume concentration C of the slurry in the E.J. gas general formula from the step one and the step two v Density ρ of mud k The method comprises the steps of carrying out a first treatment on the surface of the The e.j. gas general formula is:
wherein: v (V) C Represents a critical flow rate; d represents the diameter of a mud pump pipeline; ρ g Represents the natural density of the mucky soil;
wherein,,
w 0 the natural water content of the original mucky soil is obtained, and w is the water content of the slurry after water addition;
step four, obtaining a critical flow velocity V taking the water content w as a variable according to an E.J. gas general formula C ，
Step five, obtaining the time t required by the output of the water content w of each cubic meter of sludge at the critical flow rate,
and step six, calculating a relation curve of time and water content through matlab, finding an optimal point to obtain the optimal water content, wherein the time required for outputting slurry obtained after flushing per cubic meter of sludge at the optimal point at a critical flow rate is minimum, and the water content is the optimal water content.
2. The method of claim 1, wherein the slurry pump pipe diameter is 15cm,20cm,30cm or 35cm.
3. The hydroexcavation pulping process of claim 1, wherein the specific gravity d is as defined in step one s Taking an average value of 2.72; step d 85 ＝0.033mm。
4. The hydraulic punching pulping proportioning method for the mucky soil according to claim 1, wherein the basic physical and mechanical property indexes of the mucky soil are as follows:
natural water content w 0 =31.7 to 41.3%, specific gravity d s =2.71 to 2.74, severe γ=16.7 to 18.3kN/m 3 Void ratio e 0 =0.95 to 1.2, limit w L =31.5 to 41.9, plastic limit w p ＝20.3～27.2；
Wherein, for the mucky soil with the water content of 31.7%, each cubic meter of soil is sprayed by a high-pressure water gun for 0.78m 3 For a mucky soil with a water content of 41.3%, each cubic meter of soil was sprayed with a high-pressure water gun at 0.29m 3 So that the water content of the slurry is dividedUp to 94% and 61.4%, respectively, of mucky soil with a water content of between 31.7% and 41.3%, the amount of water to be flushed being calculated by means of linear interpolation.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5593930A (en) * | 1992-03-26 | 1997-01-14 | Ngk Insulators, Ltd. | Composition for high pressure casting slip, high pressure casting slip and method for preparing the composition and slip |
| CN106245652A (en) * | 2016-08-04 | 2016-12-21 | 中建三局第二建设工程有限责任公司 | A kind of construction method of deep foundation pit earthwork digging near a river |
| CN107761670A (en) * | 2017-11-07 | 2018-03-06 | 南京盼源工程技术有限公司 | Stockyard dischargeable capacity method for optimally controlling based on the control of dredged mud original state |
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- 2019-09-30 CN CN201910939428.5A patent/CN111125863B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5593930A (en) * | 1992-03-26 | 1997-01-14 | Ngk Insulators, Ltd. | Composition for high pressure casting slip, high pressure casting slip and method for preparing the composition and slip |
| CN106245652A (en) * | 2016-08-04 | 2016-12-21 | 中建三局第二建设工程有限责任公司 | A kind of construction method of deep foundation pit earthwork digging near a river |
| CN107761670A (en) * | 2017-11-07 | 2018-03-06 | 南京盼源工程技术有限公司 | Stockyard dischargeable capacity method for optimally controlling based on the control of dredged mud original state |
Non-Patent Citations (4)
| Title |
|---|
| 何武全 ; 蔡明科 ; 何欣烨 ; 张晨笛 ; .引黄灌区浑水管道输水临界不淤流速分析与计算.排灌机械工程学报.2013,(01),全文. * |
| 吉小明 ; 谭文 ; .饱和含水砂层地下水渗流对隧道围岩加固效果的影响研究.岩石力学与工程学报.2010,(S2),全文. * |
| 张树茂 等.基于VB语言的尾矿输送水力计算程序的研究与开发.《有色金属》.2019,第71卷(第2期),全文. * |
| 李玲 ; .乌鲁木齐地区低液限粉土毛细水迁移特性研究.公路.2013,(08),全文. * |
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