CN113820466A - Post-remediation polluted site assessment method based on engineering safety assessment - Google Patents

Post-remediation polluted site assessment method based on engineering safety assessment Download PDF

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CN113820466A
CN113820466A CN202111179599.6A CN202111179599A CN113820466A CN 113820466 A CN113820466 A CN 113820466A CN 202111179599 A CN202111179599 A CN 202111179599A CN 113820466 A CN113820466 A CN 113820466A
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soil
sample
detection
indexes
repaired
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CN113820466B (en
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王荐
王梦杰
吴运金
李仁英
姜锦林
张亚
杨敏
张胜田
邓绍坡
胡洁
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Nanjing Institute of Environmental Sciences MEE
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Nanjing Institute of Environmental Sciences MEE
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/18—Water
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/02—Devices for withdrawing samples
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
    • G01N17/006—Investigating resistance of materials to the weather, to corrosion, or to light of metals
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
    • G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/18—Water
    • G01N33/1813—Water specific cations in water, e.g. heavy metals
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/18—Water
    • G01N33/182—Water specific anions in water
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/24—Earth materials
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/24—Earth materials
    • G01N33/246—Earth materials for water content

Abstract

The invention discloses a method for evaluating a repaired pollution site based on engineering safety evaluation, which comprises the following steps of S1, respectively collecting a soil sample and an underground water sample in the repaired pollution site; s2, respectively detecting the physical and mechanical indexes of foundation soil of the soil sample and the corrosivity detection indexes of the soil sample, and detecting the corrosivity detection indexes of the groundwater sample; s3, calculating a hazard quotient of the construction engineering according to physical and mechanical indexes of foundation soil, including a corrosivity detection index of a soil sample and a corrosivity detection index of a groundwater sample, dividing an engineering safety level by combining with a contaminated site use plan, and determining a contaminated site safety evaluation standard according to a data index corresponding to the engineering safety level; s4, judging the engineering safety of the repaired polluted site according to the safety evaluation standard; the invention has reasonable design and high evaluation precision on engineering safety and is suitable for popularization and use.

Description

Post-remediation polluted site assessment method based on engineering safety assessment
Technical Field
The invention relates to the technical field of engineering safety assessment, in particular to a method for assessing a repaired polluted site based on engineering safety assessment.
Background
At present, the environmental problem is the main obstacle of the land recycling of the polluted site, and if the polluted site is recycled blindly, the ecological environment and the human health are damaged. Therefore, the reasonable method for evaluating the land recycling of the polluted site is particularly important in the recycling process of the polluted site.
In the recycling process of the polluted site, the method for evaluating the restoration of the polluted site is a method for evaluating the recycling of the polluted site which is generally applied at present. Contaminated site remediation evaluation relies primarily on chemical analysis, i.e., by determining the content of contaminants, such as toxic and harmful substances, in the contaminated site land, e.g., by determining the type of contaminated site, and selecting a contaminant of interest for that type of contaminated site. The content of the pollutants is compared with the content of the pollutants corresponding to the preset classification threshold value of each available land, if the classification threshold value of the available land of which level is met, the polluted land is determined to be available at the level, and therefore the content of the specific pollutants in the polluted land is determined to be compared and judged, and whether the land of the polluted land can be reused and which level the polluted land belongs to can be available is determined.
However, in the prior art, the method for evaluating the recycling of the polluted site has certain limitations and contingencies in the use process, so that the method for evaluating the repaired polluted site based on the engineering safety evaluation, which has high accuracy and can be generally popularized and used, is imperative.
Disclosure of Invention
Aiming at the technical problems, the invention provides a safe and accurate assessment method for the repaired polluted site based on engineering safety assessment.
The technical scheme of the invention is as follows: a method for evaluating a repaired polluted site based on engineering safety evaluation comprises the following steps:
s1, collecting samples;
s11, carrying out grid sampling and point distribution on the repaired polluted site, controlling the grid spacing to be 20-35m, the sampling depth to be 1-6m and the sampling amount to be 8-15g, carrying out soil sample collection, then carrying out air drying on each collected soil sample under a ventilation condition, and carrying out screening and impurity removal through a 50-80 mesh screen for later use;
s12, detecting the depth of the underground water level of the repaired polluted site, then establishing 15-30 underground water detection wells with the interval of 12-45m in the polluted site, performing well washing operation on each underground water detection well, and finally performing underground water sample collection;
s2, detecting a sample;
s21, respectively detecting the physical and mechanical indexes of the foundation soil of each soil sample obtained in the step S11 and the corrosivity detection indexes of the soil samples; the physical and mechanical indexes of the foundation soil of the soil sample comprise: the characteristic value of bearing capacity of the foundation, the water content, the specific gravity, the compression coefficient, the compression modulus, the internal friction angle and the cohesion; the soil sample corrosivity detection indexes comprise: pH, Ca2+、Mg2+、Cl-、SO4 2-、HCO3 -、CO3 2-Lyotropic salts, redox potential, polarization current density, resistivity and mass loss;
s22, respectivelyAnd (3) detecting the corrosivity detection indexes of the underground water samples obtained in the step S12, wherein the corrosivity detection indexes of the underground water samples comprise: pH, Ca2+、Mg2+、Cl-、SO4 2-、HCO3 -、CO3 2-Aggressive CO2Free CO2、NH4 +、OH-Total degree of mineralization;
s3, establishing an evaluation model;
s31, calculating a damage quotient of the repaired polluted site to the construction engineering according to the detection data of the physical and mechanical indexes of the foundation soil of the soil sample in the step S21, the corrosivity detection index of the soil sample and the corrosivity detection index of the groundwater sample in the step S22, and performing risk characterization;
s32, combining with the use planning of the polluted site, dividing the engineering safety level into 4 levels, namely I level, II level, III level and IV level; determining a safety evaluation standard of the polluted site according to data indexes corresponding to the engineering safety level, wherein the data indexes comprise a concrete structure corrosion rate and a steel structure corrosion rate; wherein, the corrosion rate of the concrete structure corresponding to the I-level engineering safety is 12-15g/dm2A, the corrosion rate of the steel structure is 8-10g/dm2A; the corrosion rate of the concrete structure corresponding to the level II engineering safety is 9-12g/dm2A, the corrosion rate of the steel structure is 6-8g/dm2A; the corrosion rate of the concrete structure corresponding to the III-grade engineering safety is 6-9g/dm2A, the corrosion rate of the steel structure is 4-6g/dm2A; the corrosion rate of the concrete structure corresponding to the IV-level engineering safety is 3-6g/dm2A, the corrosion rate of the steel structure is 2-4g/dm2.a；
S4, outputting the result;
calculating the corrosion rate of the repaired polluted site to a concrete structure and a steel structure, and judging whether the pollution risk of each sampling point of the repaired polluted site can be received according to the safety evaluation standard of the step S32; if the pollution risk is acceptable, the assessment is finished; and if the pollution risk is unacceptable, making a corresponding pollution site remediation scheme.
Furthermore, in the step S12, in the well washing process of the groundwater detection well, the usage amount of the washing water is 4-8 times of the volume of the groundwater detection well, and the influence of external factors on groundwater indexes can be eliminated by performing multiple well washing operations on the groundwater detection well, so that the representativeness of the water sample in the groundwater detection well is improved.
Further, in step S12, collecting an underground water sample after the water body in the underground water detection well is stabilized for 5-12 h; meanwhile, in the process of collecting the underground water sample, the sampling depth is 0.4-0.7m greater than the underground water level depth of the repaired polluted site, and the representativeness of the underground water sample can be improved through the operation.
Further, after the step S2 is completed, performing data descriptive statistical analysis on the physical and mechanical indexes of the foundation soil of the soil sample, the corrosivity detection indexes of the soil sample and the corrosivity detection indexes of the groundwater sample, and performing normal distribution judgment by using skewness, kurtosis and variation coefficient as main measurement indexes; the precision and the reliability of the sampling data can be improved through the operation.
Further, before the step S11, firstly, determining the rock and soil distribution condition of the repaired contaminated site, after the step S11 is completed, performing classification statistics on the collected soil samples according to the rock and soil distribution condition of the repaired contaminated site to obtain various rock and soil layer data samples, and interpolating data of other unmeasured positions from the various rock and soil layer data samples by using an inverse distance weighting method to obtain sample data of each position of the various rock and soil layers; through the operation, the contaminated soil sampling and detection efficiency can be obviously improved, meanwhile, the distribution situation of the contaminants after the contaminated site is repaired can be accurately predicted, and the method has a progressive significance for the investigation work of the contaminated site in the later period.
Further, in step S21, after the physical and mechanical indexes of the foundation soil of the soil sample and the corrosivity detection indexes of the soil sample are detected, the sample data detection values of the same type of rock-soil layer are summed and averaged, and the obtained average value is used as the sample detection value of the corresponding sampling point of the corresponding rock-soil layer.
Further, after step S4 is completed, supplementary sampling and data detection are performed on the unacceptable area of the pollution risk, and interference of human factors on the evaluation result can be eliminated through the supplementary sampling, so that the reliability of the evaluation method of the present invention is improved.
Further, after step S2 is completed, sorting the physical and mechanical indexes of the foundation soil of the soil sample, the corrosivity detection indexes of the soil sample, and the corrosivity detection indexes of the groundwater sample; the distribution rule of residual pollutants in the repaired polluted field can be obtained through the operation, and secondary repairing work on the polluted land which does not reach the standard can be favorably carried out.
Further, in step S21, the soil sample is detected according to the Tessier continuous extraction procedure, and after the detection is completed, the soil sample is subjected to safety classification according to GB/T19285, and by performing the safety classification on the soil sample, reliable theoretical guidance can be provided for subsequent engineering construction.
Compared with the prior art, the invention has the beneficial effects that: the invention has reasonable design and is beneficial to improving the repeated utilization rate of the repaired polluted site; meanwhile, a scientific theoretical basis can be provided for the purpose of the repaired polluted production place, and the accuracy of the reusable type of the polluted place land is improved; the grid point supplementing method is adopted in the process of collecting the soil sample of the polluted site, so that the method can obtain higher site pollutant spatial distribution prediction precision at the same sampling point, not only can obviously improve the efficiency, but also can obviously improve the prediction precision and can obtain a more accurate pollution prediction range; according to the invention, the soil condition of the repaired area can be comprehensively known by carrying out multi-point sampling and detection on the repaired polluted site, the pollutant range of the repaired polluted area can be evaluated, the influence of soil repairing pollution on engineering safety can be quantitatively evaluated, and reliable technical support is further provided for engineering safety construction; the method can accurately judge the risk of the re-development and the reuse of the polluted site, overall implement the construction engineering and ensure the environmental safety of the soil and the underground water.
Detailed Description
Example 1: a method for evaluating a repaired polluted site based on engineering safety evaluation comprises the following steps:
s1, collecting samples;
s11, carrying out grid sampling and point distribution on the repaired polluted site, controlling the grid spacing to be 20m, the sampling depth to be 1m and the sampling amount to be 8g, carrying out soil sample collection, then carrying out air drying on each collected soil sample under the ventilation condition, and carrying out screening and impurity removal through a 50-mesh screen for later use;
s12, detecting the depth of the underground water level of the repaired polluted site, then establishing 15 underground water detection wells with the interval of 12m in the polluted site, performing well washing operation on each underground water detection well, and finally collecting an underground water sample;
s2, detecting a sample;
s21, respectively detecting the physical and mechanical indexes of the foundation soil of each soil sample obtained in the step S11 and the corrosivity detection indexes of the soil samples; the physical and mechanical indexes of the foundation soil of the soil sample comprise: the characteristic value of bearing capacity of the foundation, the water content, the specific gravity, the compression coefficient, the compression modulus, the internal friction angle and the cohesion; the soil sample corrosivity detection indexes comprise: pH, Ca2+、Mg2+、Cl-、SO4 2-、HCO3 -、CO3 2-Lyotropic salts, redox potential, polarization current density, resistivity and mass loss;
s22, respectively detecting the corrosivity detection indexes of the underground water samples obtained in the step S12, wherein the corrosivity detection indexes of the underground water samples comprise: pH, Ca2+、Mg2+、Cl-、SO4 2-、HCO3 -、CO3 2-Aggressive CO2Free CO2、NH4 +、OH-Total degree of mineralization;
s3, establishing an evaluation model;
s31, calculating a damage quotient of the repaired polluted site to the construction engineering according to the detection data of the physical and mechanical indexes of the foundation soil of the soil sample in the step S21, the corrosivity detection index of the soil sample and the corrosivity detection index of the groundwater sample in the step S22, and performing risk characterization;
s32, combining with the use planning of the polluted site, dividing the engineering safety level into 4 levels, namely I level, II level, III level and IV level; determining a safety evaluation standard of the polluted site according to data indexes corresponding to the engineering safety level, wherein the data indexes comprise a concrete structure corrosion rate and a steel structure corrosion rate; wherein, the corrosion rate of the concrete structure corresponding to the I-level engineering safety is 12-15g/dm2A, the corrosion rate of the steel structure is 8-10g/dm2A; the corrosion rate of the concrete structure corresponding to the level II engineering safety is 9-12g/dm2A, the corrosion rate of the steel structure is 6-8g/dm2A; the corrosion rate of the concrete structure corresponding to the III-grade engineering safety is 6-9g/dm2A, the corrosion rate of the steel structure is 4-6g/dm2A; the corrosion rate of the concrete structure corresponding to the IV-level engineering safety is 3-6g/dm2A, the corrosion rate of the steel structure is 2-4g/dm2.a；
S4, outputting the result;
calculating the corrosion rate of the repaired polluted site to a concrete structure and a steel structure, and judging whether the pollution risk of each sampling point of the repaired polluted site can be received according to the safety evaluation standard of the step S32; if the pollution risk is acceptable, the assessment is finished; and if the pollution risk is unacceptable, making a corresponding pollution site remediation scheme.
Example 2: a method for evaluating a repaired polluted site based on engineering safety evaluation comprises the following steps:
s1, collecting samples;
s11, carrying out grid sampling and point distribution on the repaired polluted site, controlling the grid spacing to be 28m, the sampling depth to be 4m and the sampling amount to be 13g, carrying out soil sample collection, then carrying out air drying on each collected soil sample under the ventilation condition, and carrying out screening and impurity removal through a 60-mesh screen for later use;
s12, detecting the depth of the underground water level of the repaired polluted site, then establishing 26 underground water detection wells with the interval of 30m in the polluted site, performing well washing operation on each underground water detection well, and finally collecting an underground water sample; in the well washing process of the underground water detection well, the using amount of washing water is 4 times of the volume of the underground water detection well, and the influence of external factors on underground water indexes can be eliminated by carrying out multiple well washing operations on the underground water detection well, so that the representativeness of a water sample in the underground water detection well is improved; collecting an underground water sample after the water body in the underground water detection well is stabilized for 5 hours; meanwhile, in the process of collecting the underground water sample, the sampling depth is 0.4m greater than the underground water level depth of the repaired polluted site, and the representativeness of the underground water sample can be improved through the above operations;
s2, detecting a sample;
s21, respectively detecting the physical and mechanical indexes of the foundation soil of each soil sample obtained in the step S11 and the corrosivity detection indexes of the soil samples; the physical and mechanical indexes of the foundation soil of the soil sample comprise: the characteristic value of bearing capacity of the foundation, the water content, the specific gravity, the compression coefficient, the compression modulus, the internal friction angle and the cohesion; the soil sample corrosivity detection indexes comprise: pH, Ca2+、Mg2+、Cl-、SO4 2-、HCO3 -、CO3 2-Lyotropic salts, redox potential, polarization current density, resistivity and mass loss;
s22, respectively detecting the corrosivity detection indexes of the underground water samples obtained in the step S12, wherein the corrosivity detection indexes of the underground water samples comprise: pH, Ca2+、Mg2+、Cl-、SO4 2-、HCO3 -、CO3 2-Aggressive CO2Free CO2、NH4 +、OH-Total degree of mineralization;
s3, establishing an evaluation model;
s31, calculating a damage quotient of the repaired polluted site to the construction engineering according to the detection data of the physical and mechanical indexes of the foundation soil of the soil sample in the step S21, the corrosivity detection index of the soil sample and the corrosivity detection index of the groundwater sample in the step S22, and performing risk characterization;
s32, combining with the use planning of the polluted site, dividing the engineering safety level into 4 levels, namely I level, II level, III level and IV level; then according to engineering safetyDetermining a safety evaluation standard of the polluted site by using data indexes corresponding to the grades, wherein the data indexes comprise a concrete structure corrosion rate and a steel structure corrosion rate; wherein, the corrosion rate of the concrete structure corresponding to the I-level engineering safety is 12-15g/dm2A, the corrosion rate of the steel structure is 8-10g/dm2A; the corrosion rate of the concrete structure corresponding to the level II engineering safety is 9-12g/dm2A, the corrosion rate of the steel structure is 6-8g/dm2A; the corrosion rate of the concrete structure corresponding to the III-grade engineering safety is 6-9g/dm2A, the corrosion rate of the steel structure is 4-6g/dm2A; the corrosion rate of the concrete structure corresponding to the IV-level engineering safety is 3-6g/dm2A, the corrosion rate of the steel structure is 2-4g/dm2.a；
S4, outputting the result;
calculating the corrosion rate of the repaired polluted site to a concrete structure and a steel structure, and judging whether the pollution risk of each sampling point of the repaired polluted site can be received according to the safety evaluation standard of the step S32; if the pollution risk is acceptable, the assessment is finished; and if the pollution risk is unacceptable, making a corresponding pollution site remediation scheme.
Example 3: a method for evaluating a repaired polluted site based on engineering safety evaluation comprises the following steps:
s1, collecting samples;
s11, carrying out grid sampling and point distribution on the repaired polluted site, controlling the grid spacing to be 35m, the sampling depth to be 6m and the sampling amount to be 15g, carrying out soil sample collection, then carrying out air drying on each collected soil sample under the ventilation condition, and carrying out screening and impurity removal through a 80-mesh screen for later use;
s12, detecting the depth of the underground water level of the repaired polluted site, then establishing 30 underground water detection wells with the distance of 45m in the polluted site, performing well washing operation on each underground water detection well, and finally collecting underground water samples;
s2, detecting a sample;
s21, respectively detecting the physical and mechanical indexes of the foundation soil of each soil sample obtained in the step S11 and the corrosivity detection indexes of the soil samples; soil sampleThe physical and mechanical indexes of the foundation soil comprise: the characteristic value of bearing capacity of the foundation, the water content, the specific gravity, the compression coefficient, the compression modulus, the internal friction angle and the cohesion; the soil sample corrosivity detection indexes comprise: pH, Ca2+、Mg2+、Cl-、SO4 2-、HCO3 -、CO3 2-Lyotropic salts, redox potential, polarization current density, resistivity and mass loss; after the foundation soil physical and mechanical indexes of the soil sample and the corrosivity detection indexes of the soil sample are detected, adding and averaging sample data detection values of the same rock-soil layer, and taking the obtained average value as a sample detection value of a corresponding sampling point of the corresponding rock-soil layer;
s22, respectively detecting the corrosivity detection indexes of the underground water samples obtained in the step S12, wherein the corrosivity detection indexes of the underground water samples comprise: pH, Ca2+、Mg2+、Cl-、SO4 2-、HCO3 -、CO3 2-Aggressive CO2Free CO2、NH4 +、OH-Total degree of mineralization; then carrying out data descriptive statistical analysis on the physical and mechanical indexes of foundation soil of the soil sample, the corrosivity detection indexes of the soil sample and the corrosivity detection indexes of the underground water sample, and carrying out normal distribution judgment by taking skewness, kurtosis and variation coefficients as main measurement indexes; the precision and the reliability of the sampling data can be improved through the operation; finally, sequencing the physical and mechanical indexes of the foundation soil of the soil sample, the corrosivity detection indexes of the soil sample and the corrosivity detection indexes of the underground water sample; by the operation, the distribution rule of residual pollutants in the repaired polluted site can be obtained, and secondary repairing work on the polluted land which does not reach the standard can be favorably carried out;
s3, establishing an evaluation model;
s31, calculating a damage quotient of the repaired polluted site to the construction engineering according to the detection data of the physical and mechanical indexes of the foundation soil of the soil sample in the step S21, the corrosivity detection index of the soil sample and the corrosivity detection index of the groundwater sample in the step S22, and performing risk characterization;
s32, combining with the use planning of the polluted site, dividing the engineering safety level into 4 levels, namely I level, II level, III level and IV level; determining a safety evaluation standard of the polluted site according to data indexes corresponding to the engineering safety level, wherein the data indexes comprise a concrete structure corrosion rate and a steel structure corrosion rate; wherein, the corrosion rate of the concrete structure corresponding to the I-level engineering safety is 12-15g/dm2A, the corrosion rate of the steel structure is 8-10g/dm2A; the corrosion rate of the concrete structure corresponding to the level II engineering safety is 9-12g/dm2A, the corrosion rate of the steel structure is 6-8g/dm2A; the corrosion rate of the concrete structure corresponding to the III-grade engineering safety is 6-9g/dm2A, the corrosion rate of the steel structure is 4-6g/dm2A; the corrosion rate of the concrete structure corresponding to the IV-level engineering safety is 3-6g/dm2A, the corrosion rate of the steel structure is 2-4g/dm2.a；
S4, outputting the result;
calculating the corrosion rate of the repaired polluted site to a concrete structure and a steel structure, and judging whether the pollution risk of each sampling point of the repaired polluted site can be received according to the safety evaluation standard of the step S32; if the pollution risk is acceptable, the assessment is finished; and if the pollution risk is unacceptable, making a corresponding pollution site remediation scheme.
Example 4: a method for evaluating a repaired polluted site based on engineering safety evaluation comprises the following steps:
s1, collecting samples;
s11, firstly, determining rock and soil distribution conditions of the repaired polluted site, then carrying out grid sampling point distribution on the repaired polluted site, controlling the grid spacing to be 20m, the sampling depth to be 1m and the sampling amount to be 8g, carrying out soil sample collection, then carrying out air drying on each collected soil sample under the ventilation condition, and carrying out screening and impurity removal through a 50-mesh screen for later use; finally, carrying out classification statistics on the collected soil samples according to the rock and soil distribution condition of the repaired polluted site to obtain various rock and soil layer data samples, and interpolating data of other unmeasured positions of the various rock and soil layer data samples by adopting an inverse distance weight method so as to obtain sample data of each position of the various rock and soil layers; by the operation, the sampling and detection efficiency of the polluted soil can be obviously improved, the distribution condition of the pollutants after the polluted site is repaired can be accurately predicted, and the method has a progressive significance for the investigation work of the polluted site in the later period;
s12, detecting the depth of the underground water level of the repaired polluted site, then establishing 15 underground water detection wells with the interval of 12m in the polluted site, performing well washing operation on each underground water detection well, and finally collecting an underground water sample;
s2, detecting a sample;
s21, respectively detecting the physical and mechanical indexes of the foundation soil of each soil sample obtained in the step S11 and the corrosivity detection indexes of the soil samples; the physical and mechanical indexes of the foundation soil of the soil sample comprise: the characteristic value of bearing capacity of the foundation, the water content, the specific gravity, the compression coefficient, the compression modulus, the internal friction angle and the cohesion; the soil sample corrosivity detection indexes comprise: pH, Ca2+、Mg2+、Cl-、SO4 2-、HCO3 -、CO3 2-Lyotropic salts, redox potential, polarization current density, resistivity and mass loss;
s22, respectively detecting the corrosivity detection indexes of the underground water samples obtained in the step S12, wherein the corrosivity detection indexes of the underground water samples comprise: pH, Ca2+、Mg2+、Cl-、SO4 2-、HCO3 -、CO3 2-Aggressive CO2Free CO2、NH4 +、OH-Total degree of mineralization;
s3, establishing an evaluation model;
s31, calculating a damage quotient of the repaired polluted site to the construction engineering according to the detection data of the physical and mechanical indexes of the foundation soil of the soil sample in the step S21, the corrosivity detection index of the soil sample and the corrosivity detection index of the groundwater sample in the step S22, and performing risk characterization;
s32 combination of dirtUsing and planning a dyeing site, and dividing the engineering safety level into 4 levels, namely I level, II level, III level and IV level; determining a safety evaluation standard of the polluted site according to data indexes corresponding to the engineering safety level, wherein the data indexes comprise a concrete structure corrosion rate and a steel structure corrosion rate; wherein, the corrosion rate of the concrete structure corresponding to the I-level engineering safety is 12-15g/dm2A, the corrosion rate of the steel structure is 8-10g/dm2A; the corrosion rate of the concrete structure corresponding to the level II engineering safety is 9-12g/dm2A, the corrosion rate of the steel structure is 6-8g/dm2A; the corrosion rate of the concrete structure corresponding to the III-grade engineering safety is 6-9g/dm2A, the corrosion rate of the steel structure is 4-6g/dm2A; the corrosion rate of the concrete structure corresponding to the IV-level engineering safety is 3-6g/dm2A, the corrosion rate of the steel structure is 2-4g/dm2.a；
S4, outputting the result;
calculating the corrosion rate of the repaired polluted site to a concrete structure and a steel structure, and judging whether the pollution risk of each sampling point of the repaired polluted site can be received according to the safety evaluation standard of the step S32; if the pollution risk is acceptable, the assessment is finished; and if the pollution risk is unacceptable, making a corresponding pollution site remediation scheme.
Example 5: a method for evaluating a repaired polluted site based on engineering safety evaluation comprises the following steps:
s1, collecting samples;
s11, carrying out grid sampling and point distribution on the repaired polluted site, controlling the grid spacing to be 35m, the sampling depth to be 6m and the sampling amount to be 15g, carrying out soil sample collection, then carrying out air drying on each collected soil sample under the ventilation condition, and carrying out screening and impurity removal through a 80-mesh screen for later use;
s12, detecting the depth of the underground water level of the repaired polluted site, then establishing 30 underground water detection wells with the distance of 45m in the polluted site, performing well washing operation on each underground water detection well, and finally collecting underground water samples;
s2, detecting a sample;
S21. respectively detecting the physical and mechanical indexes of the foundation soil of each soil sample obtained in the step S11 and the corrosivity detection indexes of the soil samples; the physical and mechanical indexes of the foundation soil of the soil sample comprise: the characteristic value of bearing capacity of the foundation, the water content, the specific gravity, the compression coefficient, the compression modulus, the internal friction angle and the cohesion; the soil sample corrosivity detection indexes comprise: pH, Ca2+、Mg2+、Cl-、SO4 2-、HCO3 -、CO3 2-Lyotropic salts, redox potential, polarization current density, resistivity and mass loss;
s22, respectively detecting the corrosivity detection indexes of the underground water samples obtained in the step S12, wherein the corrosivity detection indexes of the underground water samples comprise: pH, Ca2+、Mg2+、Cl-、SO4 2-、HCO3 -、CO3 2-Aggressive CO2Free CO2、NH4 +、OH-Total degree of mineralization;
s3, establishing an evaluation model;
s31, calculating a damage quotient of the repaired polluted site to the construction engineering according to the detection data of the physical and mechanical indexes of the foundation soil of the soil sample in the step S21, the corrosivity detection index of the soil sample and the corrosivity detection index of the groundwater sample in the step S22, and performing risk characterization;
s32, combining with the use planning of the polluted site, dividing the engineering safety level into 4 levels, namely I level, II level, III level and IV level; determining a safety evaluation standard of the polluted site according to data indexes corresponding to the engineering safety level, wherein the data indexes comprise a concrete structure corrosion rate and a steel structure corrosion rate; wherein, the corrosion rate of the concrete structure corresponding to the I-level engineering safety is 12-15g/dm2A, the corrosion rate of the steel structure is 8-10g/dm2A; the corrosion rate of the concrete structure corresponding to the level II engineering safety is 9-12g/dm2A, the corrosion rate of the steel structure is 6-8g/dm2A; the corrosion rate of the concrete structure corresponding to the III-grade engineering safety is 6-9g/dm2A corrosion rate of the steel structure of 4-6g/dm2A; the corrosion rate of the concrete structure corresponding to the IV-level engineering safety is 3-6g/dm2A, the corrosion rate of the steel structure is 2-4g/dm2.a；
S4, outputting the result;
calculating the corrosion rate of the repaired polluted site to a concrete structure and a steel structure, and judging whether the pollution risk of each sampling point of the repaired polluted site can be received according to the safety evaluation standard of the step S32; if the pollution risk is acceptable, the assessment is finished; if the pollution risk is unacceptable, a corresponding pollution site remediation scheme is formulated; and finally, performing supplementary sampling and data detection on the pollution risk unacceptable area, and eliminating the interference of human factors on the evaluation result through the supplementary sampling, thereby improving the reliability of the evaluation method.
Example 6: a method for evaluating a repaired polluted site based on engineering safety evaluation comprises the following steps:
s1, collecting samples;
s11, carrying out grid sampling and point distribution on the repaired polluted site, controlling the grid spacing to be 30m, the sampling depth to be 5m and the sampling amount to be 12g, carrying out soil sample collection, then carrying out air drying on each collected soil sample under the ventilation condition, and carrying out screening and impurity removal through a 60-mesh screen for later use;
s12, detecting the depth of the underground water level of the repaired polluted site, then building 25 underground water detection wells with the interval of 30m in the polluted site, performing well washing operation on each underground water detection well, and finally collecting underground water samples;
s2, detecting a sample;
s21, respectively detecting the physical and mechanical indexes of the foundation soil of each soil sample obtained in the step S11 and the corrosivity detection indexes of the soil samples; the physical and mechanical indexes of the foundation soil of the soil sample comprise: the characteristic value of bearing capacity of the foundation, the water content, the specific gravity, the compression coefficient, the compression modulus, the internal friction angle and the cohesion; the soil sample corrosivity detection indexes comprise: pH, Ca2+、Mg2+、Cl-、SO4 2-、HCO3 -、CO3 2-Lyotropic salts, redox potential, polarization current density, resistivity and mass loss; the soil sample is detected according to a Tessier continuous extraction method program, after the detection is finished, the soil sample is subjected to safety level division according to GB/T19285, and reliable theoretical guidance can be improved for subsequent engineering construction by performing the safety level division on the soil sample;
s22, respectively detecting the corrosivity detection indexes of the underground water samples obtained in the step S12, wherein the corrosivity detection indexes of the underground water samples comprise: pH, Ca2+、Mg2+、Cl-、SO4 2-、HCO3 -、CO3 2-Aggressive CO2Free CO2、NH4 +、OH-Total degree of mineralization;
s3, establishing an evaluation model;
s31, calculating a damage quotient of the repaired polluted site to the construction engineering according to the detection data of the physical and mechanical indexes of the foundation soil of the soil sample in the step S21, the corrosivity detection index of the soil sample and the corrosivity detection index of the groundwater sample in the step S22, and performing risk characterization;
s32, combining with the use planning of the polluted site, dividing the engineering safety level into 4 levels, namely I level, II level, III level and IV level; determining a safety evaluation standard of the polluted site according to data indexes corresponding to the engineering safety level, wherein the data indexes comprise a concrete structure corrosion rate and a steel structure corrosion rate; wherein, the corrosion rate of the concrete structure corresponding to the I-level engineering safety is 12-15g/dm2A, the corrosion rate of the steel structure is 8-10g/dm2A; the corrosion rate of the concrete structure corresponding to the level II engineering safety is 9-12g/dm2A, the corrosion rate of the steel structure is 6-8g/dm2A; the corrosion rate of the concrete structure corresponding to the III-grade engineering safety is 6-9g/dm2A, the corrosion rate of the steel structure is 4-6g/dm2A; the corrosion rate of the concrete structure corresponding to the IV-level engineering safety is 3-6g/dm2A, the corrosion rate of the steel structure is 2-4g/dm2.a；
S4, outputting the result;
calculating the corrosion rate of the repaired polluted site to a concrete structure and a steel structure, and judging whether the pollution risk of each sampling point of the repaired polluted site can be received according to the safety evaluation standard of the step S32; if the pollution risk is acceptable, the assessment is finished; and if the pollution risk is unacceptable, making a corresponding pollution site remediation scheme.
Embodiment 7 a post-remediation contaminated site assessment method based on engineering safety assessment, comprising the steps of:
s1, collecting samples;
s11, firstly, determining the rock and soil distribution condition of the repaired polluted site, carrying out grid sampling and point distribution on the repaired polluted site, controlling the grid spacing to be 35m, the sampling depth to be 6m and the sampling amount to be 15g, carrying out soil sample collection, then carrying out air drying on each collected soil sample under the ventilation condition, and carrying out screening and impurity removal through a 80-mesh screen for later use; finally, carrying out classification statistics on the collected soil samples according to the rock and soil distribution condition of the repaired polluted site to obtain various rock and soil layer data samples, and interpolating data of other unmeasured positions of the various rock and soil layer data samples by adopting an inverse distance weight method so as to obtain sample data of each position of the various rock and soil layers; by the operation, the sampling and detection efficiency of the polluted soil can be obviously improved, the distribution condition of the pollutants after the polluted site is repaired can be accurately predicted, and the method has a progressive significance for the investigation work of the polluted site in the later period;
s12, detecting the depth of the underground water level of the repaired polluted site, then establishing 30 underground water detection wells with the distance of 45m in the polluted site, performing well washing operation on each underground water detection well, and finally collecting underground water samples; the method comprises the following steps that in the well washing process of the underground water detection well, the using amount of washing water is 8 times of the volume of the underground water detection well, and the influence of external factors on underground water indexes can be eliminated by carrying out multiple well washing operations on the underground water detection well, so that the representativeness of a water sample in the underground water detection well is improved; collecting an underground water sample after the water body in the underground water detection well is stabilized for 12 hours; meanwhile, in the process of collecting the underground water sample, the sampling depth is 0.7m greater than the underground water level depth of the repaired polluted site, and the representativeness of the underground water sample can be improved through the above operations;
s2, detecting a sample;
s21, respectively detecting the physical and mechanical indexes of the foundation soil of each soil sample obtained in the step S11 and the corrosivity detection indexes of the soil samples; the physical and mechanical indexes of the foundation soil of the soil sample comprise: the characteristic value of bearing capacity of the foundation, the water content, the specific gravity, the compression coefficient, the compression modulus, the internal friction angle and the cohesion; the soil sample corrosivity detection indexes comprise: pH, Ca2+、Mg2+、Cl-、SO4 2-、HCO3 -、CO3 2-Lyotropic salts, redox potential, polarization current density, resistivity and mass loss; the soil sample is detected according to a Tessier continuous extraction method program, after the detection is finished, the soil sample is subjected to safety level division according to GB/T19285, and reliable theoretical guidance can be improved for subsequent engineering construction by performing the safety level division on the soil sample; after the foundation soil physical and mechanical indexes of the soil sample and the corrosivity detection indexes of the soil sample are detected, adding and averaging sample data detection values of the same rock-soil layer, and taking the obtained average value as a sample detection value of a corresponding sampling point of the corresponding rock-soil layer;
s22, respectively detecting the corrosivity detection indexes of the underground water samples obtained in the step S12, wherein the corrosivity detection indexes of the underground water samples comprise: pH, Ca2+、Mg2+、Cl-、SO4 2-、HCO3 -、CO3 2-Aggressive CO2Free CO2、NH4 +、OH-Total degree of mineralization; then carrying out data descriptive statistical analysis on the physical and mechanical indexes of foundation soil of the soil sample, the corrosivity detection indexes of the soil sample and the corrosivity detection indexes of the underground water sample, and carrying out normal distribution judgment by taking skewness, kurtosis and variation coefficients as main measurement indexes; the precision and the reliability of the sampling data can be improved through the operation; finally, the physical and mechanical indexes of the foundation soil of the soil sample and the decay of the soil sampleSequencing the corrosivity detection index and the corrosivity detection index of the underground water sample; by the operation, the distribution rule of residual pollutants in the repaired polluted site can be obtained, and secondary repairing work on the polluted land which does not reach the standard can be favorably carried out;
s3, establishing an evaluation model;
s31, calculating a damage quotient of the repaired polluted site to the construction engineering according to the detection data of the physical and mechanical indexes of the foundation soil of the soil sample in the step S21, the corrosivity detection index of the soil sample and the corrosivity detection index of the groundwater sample in the step S22, and performing risk characterization;
s32, combining with the use planning of the polluted site, dividing the engineering safety level into 4 levels, namely I level, II level, III level and IV level; determining a safety evaluation standard of the polluted site according to data indexes corresponding to the engineering safety level, wherein the data indexes comprise a concrete structure corrosion rate and a steel structure corrosion rate; wherein, the corrosion rate of the concrete structure corresponding to the I-level engineering safety is 12-15g/dm2A, the corrosion rate of the steel structure is 8-10g/dm2A; the corrosion rate of the concrete structure corresponding to the level II engineering safety is 9-12g/dm2A, the corrosion rate of the steel structure is 6-8g/dm2A; the corrosion rate of the concrete structure corresponding to the III-grade engineering safety is 6-9g/dm2A, the corrosion rate of the steel structure is 4-6g/dm2A; the corrosion rate of the concrete structure corresponding to the IV-level engineering safety is 3-6g/dm2A, the corrosion rate of the steel structure is 2-4g/dm2.a；
S4, outputting the result;
calculating the corrosion rate of the repaired polluted site to a concrete structure and a steel structure, and judging whether the pollution risk of each sampling point of the repaired polluted site can be received according to the safety evaluation standard of the step S32; if the pollution risk is acceptable, the assessment is finished; if the pollution risk is unacceptable, a corresponding pollution site remediation scheme is formulated; and finally, performing supplementary sampling and data detection on the pollution risk unacceptable area, and eliminating the interference of human factors on the evaluation result through the supplementary sampling, thereby improving the reliability of the evaluation method.
Test example: respectively utilizing the methods of the embodiments 1 to 7 of the invention to respectively carry out post-repair safety assessment on different polluted sites of a certain chemical industry park in south China, respectively collecting the concrete structure samples and the steel structure samples of the polluted sites of buildings at various safety levels for corrosion rate detection 5 years after the assessment is finished, and comparing the detection results with standard data, wherein the comparison deviation is shown in Table 1;
table 1, influence of different evaluation methods on the evaluation results;
Figure BDA0003295134200000161
as can be seen from the data in table 1, example 2 is comparable to example 1; the distance between the groundwater sampling depth and the groundwater level depth of the repaired polluted site is controlled, and the water body stability time in the detection well is controlled, so that the representativeness of the groundwater sample can be improved, and the accuracy of an evaluation result of the groundwater sample on the influence of the concrete structure corrosion rate is improved; compared with the embodiment 1, the embodiment 3 has the advantages that data descriptive statistical analysis is carried out on the physical and mechanical indexes of the foundation soil of the soil sample, the corrosivity detection indexes of the soil sample and the corrosivity detection indexes of the underground water sample, normal distribution judgment is carried out, the precision and the reliability of sampling data can be improved, the distribution rule of residual pollutants in the repaired polluted field can be obtained by sequencing the physical and mechanical indexes of the foundation soil of the soil sample, the corrosivity detection indexes of the soil sample and the corrosivity detection indexes of the underground water sample, and secondary repair work can be carried out on the unqualified polluted field; compared with the embodiment 1, the method has the advantages that the polluted soil sampling and detecting efficiency can be obviously improved by determining the rock and soil distribution condition of the repaired polluted site, meanwhile, the distribution condition of the repaired pollutants in the polluted site can be accurately predicted, and the method has a progressive significance for the investigation work of the later-stage polluted site; compared with the embodiment 1, the embodiment 5 can eliminate the interference of human factors on the evaluation result by supplementing sampling, thereby improving the accuracy of the evaluation method; compared with the embodiment 1, the embodiment 6 can improve reliable theoretical guidance for subsequent engineering construction by performing safety grade division on the soil sample; example 7 compared with examples 1 to 6, the evaluation method of the present invention has higher accuracy by integrating and optimizing the advantageous conditions.

Claims (10)

1. A method for evaluating a repaired polluted site based on engineering safety evaluation is characterized by comprising the following steps:
s1, collecting samples;
s11, carrying out grid sampling and point distribution on the repaired polluted site, controlling the grid spacing to be 20-35m, the sampling depth to be 1-6m and the sampling amount to be 8-15g, carrying out soil sample collection, then carrying out air drying on each collected soil sample under a ventilation condition, and carrying out screening and impurity removal through a 50-80 mesh screen for later use;
s12, detecting the depth of the underground water level of the repaired polluted site, then establishing 15-30 underground water detection wells with the interval of 12-45m in the polluted site, performing well washing operation on each underground water detection well, and finally performing underground water sample collection;
s2, detecting a sample;
s21, respectively detecting the physical and mechanical indexes of the foundation soil of each soil sample obtained in the step S11 and the corrosivity detection indexes of the soil samples; the physical and mechanical indexes of the foundation soil of the soil sample comprise: the characteristic value of bearing capacity of the foundation, the water content, the specific gravity, the compression coefficient, the compression modulus, the internal friction angle and the cohesion; the soil sample corrosivity detection index comprises: pH, Ca2+、Mg2+、Cl-、SO4 2-、HCO3 -、CO3 2-Lyotropic salts, redox potential, polarization current density, resistivity and mass loss;
s22, respectively detecting the corrosivity detection indexes of the underground water samples obtained in the step S12, wherein the corrosivity detection indexes of the underground water samples comprise: pH, Ca2+、Mg2+、Cl-、SO4 2-、HCO3 -、CO3 2-Aggressive CO2Free CO2、NH4 +、OH-Total degree of mineralization;
s3, establishing an evaluation model;
s31, calculating a damage quotient of the repaired polluted site to the construction engineering according to the detection data of the physical and mechanical indexes of the foundation soil of the soil sample in the step S21, the corrosivity detection index of the soil sample and the corrosivity detection index of the groundwater sample in the step S22, and performing risk characterization;
s32, combining with the use planning of the polluted site, dividing the engineering safety level into 4 levels, namely I level, II level, III level and IV level; determining a safety evaluation standard of a polluted site according to a data index corresponding to the engineering safety level, wherein the data index comprises a concrete structure corrosion rate and a steel structure corrosion rate; wherein, the corrosion rate of the concrete structure corresponding to the I-level engineering safety is 12-15g/dm2A, the corrosion rate of the steel structure is 8-10g/dm2A; the corrosion rate of the concrete structure corresponding to the level II engineering safety is 9-12g/dm2A, the corrosion rate of the steel structure is 6-8g/dm2A; the corrosion rate of the concrete structure corresponding to the III-grade engineering safety is 6-9g/dm2A, the corrosion rate of the steel structure is 4-6g/dm2A; the corrosion rate of the concrete structure corresponding to the IV-level engineering safety is 3-6g/dm2A, the corrosion rate of the steel structure is 2-4g/dm2.a；
S4, outputting the result;
calculating the corrosion rate of the repaired polluted site to a concrete structure and a steel structure, and judging whether the pollution risk of each sampling point of the repaired polluted site can be received according to the safety evaluation standard in the step S32; if the pollution risk is acceptable, the assessment is finished; and if the pollution risk is unacceptable, making a corresponding pollution site remediation scheme.
2. The method for evaluating the repaired contaminated site based on the engineering safety evaluation of claim 1, wherein in the step S12, the amount of the washing water used in the well washing process of the groundwater detection well is 4-8 times of the volume of the groundwater detection well.
3. The method for evaluating the repaired pollution site based on the engineering safety evaluation as claimed in claim 1, wherein in step S12, collecting an underground water sample after the water in the underground water detection well is stabilized for 5-12 h; meanwhile, in the process of collecting the underground water sample, the sampling depth is 0.4-0.7m greater than the underground water level depth of the repaired polluted site.
4. The method for evaluating the repaired contaminated site based on the engineering safety evaluation according to claim 1, wherein after the step S2 is completed, data descriptive statistical analysis is performed on the physical and mechanical indexes of the foundation soil of the soil sample, the corrosivity detection indexes of the soil sample and the corrosivity detection indexes of the groundwater sample, and the main measurement indexes are skewness, kurtosis and variation coefficient, and normal distribution judgment is performed.
5. The method for evaluating the repaired contaminated site based on the engineering safety evaluation of claim 1, wherein before the step S11 is performed, the distribution of the rock and soil in the repaired contaminated site is determined, after the step S11 is completed, the collected soil samples are classified and counted according to the distribution of the rock and soil in the repaired contaminated site, so as to obtain various rock and soil layer data samples, and the data samples of other unmeasured positions are interpolated from the various rock and soil layer data samples by using an inverse distance weighting method, so as to obtain the sample data of each position of the various rock and soil layers.
6. The method for evaluating the repaired contaminated site based on the engineering safety evaluation as claimed in claim 5, wherein in step S21, after the physical and mechanical indexes of the foundation soil of the soil sample and the corrosivity detection indexes of the soil sample are detected, the sample data detection values of the same type of rock-soil layer are summed and averaged, and the obtained average value is used as the sample detection value of the corresponding sampling point of the corresponding rock-soil layer.
7. The method for evaluating the repaired pollution site based on the engineering safety evaluation as claimed in claim 1, wherein after the completion of step S4, the pollution risk unacceptable area is subjected to supplementary sampling and data detection.
8. The method for evaluating the repaired contaminated site based on the engineering safety evaluation of claim 1, wherein after the completion of the step S2, the indexes of the physical mechanics of the foundation soil of the soil sample, the indexes of the corrosivity detection of the soil sample and the indexes of the corrosivity detection of the groundwater sample are ranked.
9. The method for evaluating the repaired contaminated site based on the engineering safety evaluation as claimed in claim 1, wherein in step S21, the soil sample is detected according to the Tessier continuous extraction procedure, and after the detection, the soil sample is graded in safety.
10. The method for evaluating the repaired contaminated site based on the engineering safety evaluation of claim 1, wherein in the step S2, the amount of the washing water used in the well washing process of the groundwater detection well is 4-8 times of the volume of the groundwater detection well.
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