CN111562289B - In-situ testing method for sludge solidification - Google Patents
In-situ testing method for sludge solidification Download PDFInfo
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- CN111562289B CN111562289B CN202010649012.2A CN202010649012A CN111562289B CN 111562289 B CN111562289 B CN 111562289B CN 202010649012 A CN202010649012 A CN 202010649012A CN 111562289 B CN111562289 B CN 111562289B
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Abstract
The invention relates to the field of sludge solidification detection, in particular to a sludge solidification in-situ test method, which comprises the following steps: in-situ multipoint parallel arrangement of piezoelectric solidified soil measuring points on the sludge, wherein the piezoelectric solidified soil measuring points are distributed at equal intervals in the vertical depth and are connected with a data acquisition unit through conductive solidified soil. The measuring point consists of piezoelectric solidified soil, a super-elastic rubber film sleeve, a mesh mold, a plastic hose and conductive solidified soil; the invention provides a measuring point arrangement requirement for measuring the sludge solidification state by aiming at piezoelectric solidified soil; compared with the traditional arrangement scheme, the density of the measuring points is higher, the piezoelectric solidification states at different depths can be measured, and a test scheme is provided for the related research on sludge solidification in the future; the conductive solidified soil is prepared, and a new thought is provided for a sensor arrangement method in a soil body; the measuring sensor in the invention is piezoelectric solidified soil, has small influence on the properties of the in-situ soil body, and has more accurate measuring result compared with the traditional scheme.
Description
Technical Field
The invention relates to the field of sludge solidification detection, in particular to a sludge solidification in-situ test method which is applied to measuring point arrangement for sludge solidification state in-situ detection in dredging and dredging work such as rivers, lakes, harbors, channels and the like.
Background
At present, a plurality of domestic cities are carrying out dredging treatment around rivers or lakes to improve the water environment. However, due to the restriction of urban environment, most of the dredging projects are dredging by a dredging boat, stacking after pipeline transportation to a certain area for a long distance, and naturally precipitating and drying. Not only the floor area is large, the treatment period is long, but also the risks of pollution transfer and the like are brought. Therefore, the technology for dredging polluted sludge in rivers and lakes and deeply dewatering and curing the slurry has good application prospect in later-stage water environmental treatment engineering. How to detect the solidification state of the sludge solidified soil to ensure that the solidified sludge has good physical indexes becomes a current research direction.
The existing principle of detecting the solidification of the sludge requires that all indexes are detected according to the age of solidified soil 7d, 14d and 28 d. If the test is indoor test, the water content and the unconfined compressive strength are generally indicated by the test indexes, and compared with the design index requirements, the curing state of the test indexes is judged. If the test is in-situ test, static sounding, cross plate shearing and dynamic flat plate load tests are mostly adopted to detect the mechanical characteristics of the solidified soil under 3 working conditions of static force, disturbance and load, and comprehensively judge whether the solidified effect of the silt soil meets the design index. As the soil body in the field is greatly damaged by the cross plate shearing test, the number of the measuring points on the horizontal plane of the existing in-situ sludge solidification detection is about 2-3, and the sludge solidification state of only one depth can be measured by one-time measurement.
The in-situ testing technology has the advantages that various mechanical indexes of the silt solidified soil can be comprehensively judged, the technology is scientific, but the defects that a single measuring point can only measure the solidification degree of a certain depth, the number of the measuring points is limited by a testing instrument, and the arrangement is not too much. The development of an in-situ detection method capable of sensing the curing state of the cured soil in situ and in real time on site and a detection method capable of sensing the treatment effect at any depth are urgently needed.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a testing method for a measuring point of solidified soil in sludge, which can meet the sampling requirement of in-situ real-time sensing of the treatment effect at any depth of the solidified soil. The specific technical scheme is as follows:
an in-situ testing method for sludge solidification is characterized by comprising the following steps: in-situ multipoint parallel arrangement of piezoelectric solidified soil measuring points on the sludge, wherein the piezoelectric solidified soil measuring points are distributed at equal intervals in the vertical depth and are connected with a data acquisition unit through conductive solidified soil.
The measuring point consists of piezoelectric solidified soil, a super-elastic rubber film sleeve, a net-shaped mold, a plastic hose and conductive solidified soil; the super-elastic rubber film is sleeved in the net-shaped die; the lower end of the plastic hose is connected with a super-elastic rubber film sleeve opening; the piezoelectric solidified soil is injected into the super-elastic rubber film sleeve through the upper end of the plastic hose, and the water content of the piezoelectric solidified soil is consistent with that of an external soil body; after piezoelectric solidified soil is injected into the super-elastic rubber film sleeve of the measuring point, continuously injecting conductive solidified soil through the plastic hose until the plastic hose is full, and then burying the piezoelectric solidified soil measuring point into a sludge original position, wherein the upper end of the plastic hose extends to the ground;
during measurement, an electrode is inserted into the conductive solidified soil at the upper end of the plastic hose, and a lead is connected to the electrode and led out to be connected with a data collector.
Furthermore, the piezoelectric solidified soil is formed by solidifying the in-situ sludge and the self-sensing sludge solidifying agent, and the conductive solidified soil is formed by solidifying the in-situ sludge and the conductive solidifying agent.
Further, the self-sensing sludge curing agent is prepared by mixing cement, fly ash, piezoelectric ceramic particles and a conductive medium according to a volume ratio of 32:18:40:10, and the conductive curing agent is prepared by mixing cement, fly ash, sand and a conductive medium according to a volume ratio of 32:18:40: 10. The cement and the fly ash are ordinary portland cement and ordinary fly ash, and have no special requirements; the piezoelectric ceramic particles are PZT (lead zirconate titanate) particles, and the particle size needs to be controlled within 5mm-10 mm; the conductive medium particles are acetylene black, and the particle size needs to be controlled within 1mm-5 mm.
Further, the piezoelectric solidified soil measuring point is in a cylinder or cube shape.
Furthermore, a plurality of micro holes are formed in the surface of the super-elastic rubber film sleeve, the diameter of each hole is smaller than the particle size of sludge particles and larger than the diameter of water molecules, and the consistency of the water content of the piezoelectric solidified soil and the water content of an external soil body is guaranteed.
Further, every 25m in the sludge solidification site2A measuring hole is required to be arranged in the range, and the vertical distance between adjacent measuring points in the measuring hole is 10cm-30 cm.
The invention principle is as follows: under the condition that the piezoelectric ceramic particles and the sand have similar mechanical properties and the particle composition is the same and the proportion is the same, the piezoelectric solidified soil and the conductive solidified soil have similar mechanical properties, and an indoor proportion test of the piezoelectric solidified soil is not needed.
The micro holes in the super-elastic rubber mold can allow water molecules to pass through but not allow sludge particles to pass through, so that the moisture content of the piezoelectric solidified soil is consistent with that of the external soil body, the solidification degree of the surrounding soil body can be reflected by measuring the piezoelectric strain constant of the piezoelectric solidified soil, and meanwhile, the piezoelectric solidified soil and the surrounding soil body are also ensured to be divided to some extent to keep the shape.
The conductive solidified soil in the plastic hose is used as a connecting wire between the piezoelectric solidified soil and the data collector and is responsible for transmitting an electric signal in the conductive solidified soil to the data collector, and the plastic hose plays a role in shaping and serving as an insulating material.
Has the advantages that:
(1) the invention provides a measuring point arrangement requirement for measuring the sludge solidification state by aiming at piezoelectric solidified soil;
(2) compared with the traditional arrangement scheme, the density of the measuring points is higher, the piezoelectric solidification states at different depths can be measured, and a test scheme is provided for the research on sludge solidification in the future;
(3) the conductive solidified soil is prepared, and a new thought is provided for a sensor arrangement method in a soil body;
(4) the measuring sensor in the invention is piezoelectric solidified soil, has small influence on the properties of the in-situ soil body, and has more accurate measuring result compared with the traditional scheme.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings.
FIG. 1 is a schematic view of horizontal arrangement of measuring holes in an embodiment of the invention;
FIG. 2 is a schematic view of the longitudinal arrangement of the measuring points inside the measuring hole of the invention;
FIG. 3 is a schematic view showing the shape and arrangement direction of the measuring points according to the present invention;
FIG. 4 is a schematic view of the connection between the conductive solidified soil and the measuring device;
shown in the figure: 1-piezoelectric solidified soil, 2-conductive solidified soil, 3-mesh mould, 4-wire, 5-super elastic rubber film sleeve, 6-plastic hose, 7-measuring hole and 8-data collector.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
It should be understood that the structures, proportions, and dimensions shown in the drawings and described herein are for illustrative purposes only and are not intended to limit the scope of the present invention, which is defined by the claims, but rather by the claims. In addition, the terms such as "upper", "lower", "left", "right" and "middle" used in the present specification are for convenience of description only, and are not intended to limit the scope of the present invention, and changes or modifications of the relative relationship thereof may be regarded as the scope of the present invention without substantial changes in the technical contents.
Example (b):
as shown in fig. 1 and fig. 2, the in-situ solidification test method of the present embodiment is a multipoint parallel test method, wherein test holes 7 are arranged at equal intervals in the vertical depth of solidified soil, and internal test points are connected with a data acquisition unit through piezoelectric solidified soil 1 and conductive solidified soil 2; the piezoelectric solidified soil 1 is formed by solidifying in-situ sludge and a self-sensing sludge solidifying agent, and the conductive solidified soil is formed by solidifying in-situ sludge and a conductive solidifying agent.
The self-sensing sludge curing agent is prepared by mixing cement, fly ash, piezoelectric ceramic particles and a conductive medium according to the volume ratio of 32:18:40:10, and the conductive curing agent is prepared by mixing cement, fly ash, sand and a conductive medium according to the volume ratio of 32:18:40: 10;
as shown in FIG. 3, the measuring point can be in the shape of a cylinder or a cube, and the recommended measuring point size of the cylinder is 10cm in diameter and 10cm in height; the suggested side length of the cube measuring point is 10 cm; one end is connected with a plastic hose 6.
The measuring point consists of piezoelectric solidified soil 1, a super-elastic rubber film sleeve 5, a mesh mold 3, a plastic hose 6 and conductive solidified soil 2; the super-elastic rubber film sleeve 5 is arranged in the net-shaped die 3; the lower end of the plastic hose 6 is connected with a super-elastic rubber film 5 socket (the super-elastic rubber film 5 socket is sleeved at the lower end of the plastic hose 6); the piezoelectric solidified soil 1 is injected into a super-elastic rubber film sleeve 5 through the upper end of a plastic hose 6, and the water content of the piezoelectric solidified soil 1 is consistent with that of an external soil body; after the piezoelectric solidified soil 1 is injected into the super-elastic rubber film sleeve 5 of the measuring point, the conductive solidified soil 2 is continuously injected through the plastic hose 6 until the plastic hose 6 is full, and then the piezoelectric solidified soil measuring point is buried into a sludge original position, wherein the upper end of the plastic hose 6 extends to the ground.
As shown in fig. 4, during measuring, an electrode is inserted into the conductive solidified soil 2 in the upper end (the part located on the ground) of the plastic hose 6, a lead is connected to the electrode, and the lead is led out to be connected with the data collector 8 or the measuring equipment.
It is to be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention provides a brand-new thought and method for in-situ detection of sludge solidification, and the method and the way for specifically realizing the technical scheme are multiple. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the detailed description of the embodiments of the invention presented in the drawings is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention.
The scope of the present invention is not limited to the technical solutions disclosed in the embodiments, and any modifications, equivalent substitutions, improvements, etc. made to the above embodiments according to the technical spirit of the present invention fall within the scope of the present invention.
Claims (3)
1. An in-situ testing method for sludge solidification is characterized by comprising the following steps: in-situ multipoint parallel arrangement of piezoelectric solidified soil measuring points on the sludge, wherein the piezoelectric solidified soil measuring points are distributed at equal intervals in the vertical depth and are connected with a data acquisition unit through conductive solidified soil;
the measuring point consists of piezoelectric solidified soil, a super-elastic rubber film sleeve, a mesh mold, a plastic hose and conductive solidified soil; the super-elastic rubber film is sleeved in the net-shaped die; the lower end of the plastic hose is connected with a super-elastic rubber film sleeve opening; the piezoelectric solidified soil is injected into the super-elastic rubber film sleeve through the upper end of the plastic hose, and the water content of the piezoelectric solidified soil is consistent with that of an external soil body; after piezoelectric solidified soil is injected into the super-elastic rubber film sleeve of the measuring point, continuously injecting conductive solidified soil through the plastic hose until the plastic hose is full, and then burying the piezoelectric solidified soil measuring point into a sludge original position, wherein the upper end of the plastic hose extends to the ground; the surface of the super-elastic rubber film sleeve is provided with a plurality of tiny holes, and the diameter of each hole is smaller than the particle size of sludge particles and larger than the diameter of water molecules;
during measurement, an electrode is inserted into the conductive solidified soil at the upper end of the plastic hose, and a lead is connected to the electrode and led out to be connected with a data collector;
the piezoelectric solidified soil is formed by solidifying in-situ sludge and a self-sensing sludge curing agent, and the conductive solidified soil is formed by solidifying in-situ sludge and a conductive curing agent;
the self-sensing sludge curing agent is prepared by mixing cement, fly ash, piezoelectric ceramic particles and a conductive medium according to a volume ratio of 32:18:40:10, and the conductive curing agent is prepared by mixing cement, fly ash, sand and a conductive medium according to a volume ratio of 32:18:40: 10.
2. The in situ testing method for sludge solidification according to claim 1, wherein: the piezoelectric solidified soil measuring point is in a cylinder or cube shape.
3. The in situ test method for sludge solidification according to claim 1 or 2, characterized in that: every 25m in the sludge solidification field2A measuring hole is required to be arranged in the range, and the vertical distance between adjacent measuring points in the measuring hole is 10cm-30 cm.
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