CN112663417A - Method for screening position range of karst road base section - Google Patents

Method for screening position range of karst road base section Download PDF

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Publication number
CN112663417A
CN112663417A CN202011503538.6A CN202011503538A CN112663417A CN 112663417 A CN112663417 A CN 112663417A CN 202011503538 A CN202011503538 A CN 202011503538A CN 112663417 A CN112663417 A CN 112663417A
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karst
area
development
risk
screening
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CN112663417B (en
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朱琦
赵国
苏聚卿
朱继彬
姚守峰
刘伟长
徐决虎
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Shandong Provincial Transportation Planning and Design Institute Co Ltd
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Shandong Provincial Transportation Planning and Design Institute Co Ltd
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Abstract

The invention discloses a method for screening a position range of a karst road section, which solves the problems in the prior art, and the specific scheme is as follows: the method comprises the following steps: detecting a karst area, and dividing the development degree grade of the karst according to detection data; dividing the stability of the karst of the field based on the development degree grade of the karst; evaluating the risk of the karst area according to the karst stability of the field; and classifying the danger level of the field area based on the risk of the karst area, and screening the position range of the karst road bed section.

Description

Method for screening position range of karst road base section
Technical Field
The invention relates to the technical field of karst road beds, in particular to a method for screening the position range of a karst road bed section.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
At present, partial areas have strong karst development and numerous karst subgrade sections, and the current general adopted mode is as follows: the drawback of treating these karst subgrade sections one by one is that they are expensive and violate the economic and economical aim. Therefore, the karst subgrade needs to be graded and screened, so that necessary road sections are processed, and the construction cost is reasonably optimized on the premise of ensuring safety and quality. However, the existing survey specifications and manuals do not give defined standards for the range screening of karst subgrade treatment.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a method for screening the disposal range of a karst roadbed section, which can classify the situation of the karst roadbed in a field, evaluate risks and further screen out the disposal range of the karst roadbed section, can realize differential processing on the karst roadbed section, accurately survey results, optimize design and save manufacturing cost.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a method for screening the range of a karst subgrade section comprises the following steps:
detecting a karst area, and dividing the development degree grade of the karst according to detection data;
dividing the stability of the karst of the field based on the development degree grade of the karst;
evaluating the risk of the karst area according to the karst stability of the field;
and classifying the danger level of the field area based on the risk of the karst area, and screening the position range of the karst road bed section.
As a further technical scheme, the development degree of the karst is divided into four grades: a karst extremely strong development area, a karst medium development area and a karst weak development area.
As a further technical solution, if the hole is drilledThe hole encountering rate is more than 60 percent, or the development density of the surface karst is more than 10/km2Or the karst rate of the drilling line is more than 20 percent, or the development depth of the karst trough and the beaded vertical karst cave exceeds 50m, or the gradient angle of the rock-soil interface of the hidden karst rock-soil>30 degrees, the field region is a karst extremely strong development region; if the hole-encountering rate of the drilled hole is 30-60%, or the development density of the surface karst is 6-10/km2Or the karst rate of the drilling line is 10-20%, or the development depth of the karst trough and the beaded vertical karst cave is 20-50 m, or the gradient angle of the invisible karst rock-soil interface is 15-30 degrees, and the field area is a karst strong development area.
As a further technical scheme, if the hole-encountering rate of the drilled hole is 10-30%, or the development density of the surface karst is 1-5/km2Or the karst rate of the drilling line is 3-10 percent, or the gradient angle of the invisible karst rock-soil interface is 10-15 degrees, and the field area is a karst medium development area; if the hole-meeting rate of the drill hole is less than 10 percent, or the karst rate of the drill hole line is less than 3 percent, or the gradient angle of the rock-soil interface of the hidden karst rock-soil<And 10 degrees, the field region is a karst weak development region.
As a further technical scheme, if the field is a karst extremely strong development area, or the field contains a karst water enrichment area and a drainage zone, the field is an extremely unstable field; if the field area is a karst strong development area, or a section which contains buried funnels and troughs and is covered with soft soil bodies, or the karst water in the field area is not smoothly drained, or the field area has a multi-layer soil body structure, the field area is an unstable area; if the field area is a karst medium development area, the field area is a medium stable field; and if the field area is a karst weak development area, the field area is a stable field.
As a further technical solution, when evaluating the risk of the karst area, the field is classified by the field karst stability as: a primary area: the field area is an extremely unstable field; and (3) secondary area: the field area is an unstable field; and (3) three-stage area: the field area is a medium stable field or a stable field.
As a further technical scheme, when evaluating the risk of the karst area, determining the level of the ground collapse prediction degree of the field: factors influencing the degree of ground collapse prediction include: and determining the values of the factors in turn according to the weights of the influencing factors, so as to determine the index score of the ground collapse prediction degree, and determining the ground collapse prediction degree grade according to the index score.
As a further technical scheme, the specific process for determining the grade of the ground collapse prediction degree comprises the following steps: if the index is more than or equal to 90, the area is an extremely easy collapse area; if the index is 71-89, the area is an easily collapsed area; if the index score is less than or equal to 70, the area is not easy to collapse.
As a further technical scheme, according to the karst area risk assessment result, dividing the field into a high-risk area, a medium-risk area and a low-risk area:
high risk area: an extremely collapse region, a first-level region and an easily collapse region;
moderate risk area: a secondary region, a tertiary region and an easily collapsed region;
low risk area: tertiary region, area of difficult collapse.
As a further technical scheme, after grading, screening out the position range of the karst subgrade section of the field: the high risk area and the medium risk area are treatment areas, and the low risk area is a non-treatment area.
The beneficial effects of the invention are as follows:
according to the method, the grade of the development degree of the karst is obtained by judging the development degree of the karst in the field, the stability of the karst field is further judged, and then the disposal range of the karst subgrade section is screened out after the karst risk of the field is evaluated; therefore, only partial necessary road sections are processed, a basis is provided for distinguishing and processing different types of karst fields, errors caused by subjective judgment are reduced, meanwhile, the processing efficiency is greatly improved, the construction period is shortened, the construction quality and the construction efficiency are improved, the purpose of 'medicine giving for the case of illness' is achieved, the construction cost is greatly saved, unnecessary waste is avoided, and considerable social benefits and economic benefits are brought.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a schematic flow diagram of a screening method according to one or more embodiments of the present invention.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an", and/or "the" are intended to include the plural forms as well, unless the invention expressly state otherwise, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof;
for convenience of description, the words "up", "down", "left" and "right" in the present invention, if any, merely indicate correspondence with up, down, left and right directions of the drawings themselves, and do not limit the structure, but merely facilitate the description of the invention and simplify the description, rather than indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.
Term interpretation section: in the present invention, terms such as "mounting," "connecting," "fixing," and the like should be understood in a broad sense, for example, they may be fixedly connected, detachably connected, or integrated; the two components can be connected mechanically or electrically, directly or indirectly through an intermediate medium, or connected internally or in an interaction relationship, and the terms used in the present invention should be understood as having specific meanings to those skilled in the art.
As described in the background, the problems of the prior art are solved by the present invention, which provides a method for screening the range of a karst section.
Example one
In a typical embodiment of the present invention, a method for screening a placement range of a karst subgrade section is provided, which specifically comprises the following steps:
step 1: judging the development degree of the karst of the field area;
and acquiring exploration data of the karst cave of the field by adopting a means of combining the surveying, the geophysical prospecting and the drilling, thereby acquiring exploration data of the field.
Carrying out classification statistics on survey data of the site according to the survey data, and grading the development degree of the karst of the site, wherein the grading is divided into four grades: strong development of karst, moderate development of karst, and weak development of karst.
Wherein, the karst development degree of the field is divided according to the numerical values or ranges of detection data such as the hole-encountering rate of the field drilling, the karst rate of the drilling line, the gradient angle of the rock-soil interface of the hidden karst, and the like:
if the hole-meeting rate of the drilled hole is more than 60 percent or the development density of the surface karst is more than 10/km2Or the karst rate of the drilling line is more than 20 percent, or the development depth of the karst trough and the beaded vertical karst cave exceeds 50m, or the gradient angle of the rock-soil interface of the hidden karst rock-soil>30 degrees is a karst extremely strong development area;
if the hole-encountering rate of the drilled hole is 30-60%, or the development density of the surface karst is 6-10/km2Or the karst rate of the drilling line is 10-20%, or the development depth of the karst trough and the beaded vertical karst cave is 20-50 m, or the gradient angle of the invisible karst rock-soil interface is 15-30 degrees, so that the karst strong development area is formed;
if the hole-encountering rate of the drilled hole is 10-30%, or the development density of the surface karst is 1-5/km2Or the karst rate of the drilling line is 3-10 percent, or the gradient angle of the invisible karst rock-soil interface is 10-15 degrees, and the karst medium development zone is formed;
and if the hole encountering rate of the drill hole is less than 10 percent, or the karst rate of the drill hole line is less than 3 percent, or the gradient angle of the invisible karst rock-soil interface is less than 10 degrees, the karst weak development area is determined.
Specifically, the characteristics of the karst extremely strong development area are as follows: after long-term strong corrosion, the rock mass is basically disintegrated, so that the earth surface is generally covered with red clay, the red clay mainly comprises rock buds, dissolved and disintegrated rock masses and the like, and has the features of sloping valleys and the like, the characteristics of the karst development in the late year stage are shown, and the regional surface water system develops. The karst develops extremely strongly when one of the following conditions is met:
firstly, the karst form mainly comprises large underground rivers, galleries, large karst caves (the relative height difference of the top and the bottom of a single karst cave is more than 5m), vertical shafts and water falling caves, an underground cave system is formed or basically formed, the connectivity of the karst caves and pipelines is strong, and a large amount of karst cave water flows out;
the collapse is very easy;
thirdly, the hole-encountering rate of the drilled holes is more than 60 percent;
fourthly, the development density of the surface karst is more than 10 per km2
The karst rate of the drilling line is more than 20 percent;
sixthly, the development depth of the solution tank and the beaded vertical solution cavity exceeds 50 m;
and the gradient angle (degree) of the hidden karst rock-soil interface is larger than 30 degrees.
Wherein, the karst strong development area is characterized in that: the rock mass is intensively eroded for a long time to cause the earth surface to be widely distributed with erosion troughs and depressions; the shapes of a water falling hole and the like, and the development of underground pipeline systems such as an underground river and the like; has the characteristics of karst strong years and no surface water system development. The karst develops strongly when one of the following conditions is met:
the method has the advantages that obvious corrosion is generated along fracture, bedding plane, unconformity plane and the like, small and medium-sized cluster spherical caves develop (the relative height difference between the top and the bottom of a single karst cave is 2-5 m), an underground cave system is not formed, karst fractures are good in connectivity, small underground rivers or concentrated runoff exist, and karst fracture water gushes out;
collapse is easy;
thirdly, the solution channel, the solution tank and the stone buds are densely distributed;
fourthly, the hole-meeting rate of the drill hole is 30 to 60 percent;
fifthly, the surface karst development density is 6-10km2
Sixthly, the litholysis rate of the drilling line is 10 to 20 percent;
seventhly, the development depth of the dissolving tank or the beaded vertical dissolving cavity exceeds 20m and is not more than 50 m;
15-30 degrees of gradient angle (degree) of concealed karst rock-soil interface.
Wherein the medium development area in the karst is characterized in that: the rock mass is strongly eroded for a long time to cause the surface to develop a pipeline system underground, mainly comprising erosion cracks and stone buds; has the characteristics of corrosion and strong years, and the surface water system does not develop under the general condition. Medium development in the karst is one of the following conditions:
firstly, the karst fracture or a small cave (the relative height difference of the top and the bottom of a single karst cave is less than 2m) is enlarged along the fracture and the layer surface, the connectivity of the fracture is poor, concentrated runoff is rare, and fractured spring water is always exposed;
secondly, the hole-meeting rate of the drill hole is 10 to 30 percent;
(iii) the density of the surface karst development is 1-5/km2
Fourthly, the karst rate of the drilling line is 3 to 10 percent;
concealed karst rock-soil interface slope angle (degree) 10-15 degree.
Wherein, the characteristics of the karst weak development area are as follows: the rock mass has a karst ditch or a karst groove phenomenon, large karst forms do not develop, and water body distribution such as surface water system and the like exists. The weak development of karst is one of the following conditions:
the method mainly comprises the steps of (1) taking fissure-shaped karst or dissolving holes as main materials, and having poor water permeability of the fissure;
the hole-meeting rate of the drill hole is less than 10 percent;
thirdly, the litholysis rate of the drilling line is less than 3 percent;
fourthly, the gradient angle (degree) of the rock-soil interface of the concealed karst is less than 10 degrees.
In the above, the determination of the hole-encountering rate of the drilled hole, the development density of the surface karst, the karst rate of the drilled hole line, the solution tank, the development depth of the beaded vertical karst hole and the gradient angle of the rock-soil interface of the hidden karst adopts the prior art, and is not described herein again.
Step 2: dividing the stability of the karst of the field;
based on the geological exploration technology of the karst area, the stability of the karst area is divided into four types according to the development condition of the karst, the water-rich condition near the karst area and the stable influence condition on the area: extremely unstable sites, moderately stable sites, stable sites.
Wherein, if the field is a karst extremely strong development area, or the field contains a karst water enrichment area and a drainage zone, the field is an extremely unstable field;
if the field area is a karst strong development area, or a section which contains buried funnels and troughs and is covered with soft soil bodies, or the karst water in the field area is not smoothly drained, or the field area has a multi-layer soil body structure, the field area is an unstable area;
if the field area is a karst medium development area, the field area is a medium stable field;
and if the field area is a karst weak development area, the field area is a stable field.
Specifically, the site is an extremely unstable site when one of the following conditions exists:
firstly, a karst extremely strong development area;
a karst water enrichment area and a drainage zone;
and other unfavorable geological phenomena with great influence on the field stability exist.
An unstable site when one of the following conditions exists:
firstly, a karst strong development area;
the buried funnels, troughs and the like are covered with sections of soft soil;
thirdly, sections where karst water is not smoothly drained and possibly temporarily submerged;
fourthly, the underground water is buried shallowly and has large variation amplitude or is in a section near the water level researtor rock surface with a multilayer soil body structure;
and other unfavorable geological phenomena influencing the stability of the field exist.
The medium karst development area site is a medium stable site.
The weak karst development area is a stable area.
And step 3: evaluating the risk of the karst area;
when evaluating the risk of the karst area, the regional classification can be carried out according to the conditions of the existing structures near the periphery and the size of the karst cave and the principle of the severity of the consequences caused by accidents, and the classification is divided into one level to three levels:
a primary area: the field area is an extremely unstable field and is a whole section of collapse; in the embodiment, the upper covering layer of the karst cave is shallow, the height of the cave is more than 5 meters, the diameter of the cave is large, and the karst cave is not fully filled; or the covering layer has a soft interlayer, the height of the hole is more than 2m, the hole diameter is larger, and no filling is carried out.
And (3) secondary area: the field area is an unstable field, and the collapse possibility of the whole section is high; in this embodiment, the upper portion of the karst cave is shallow, the height of the cave is 2m to 5m, the diameter of the cave is larger, or the cave is over 5m but is fully filled with soft plastic powdery clay or loose sandy soil. Or the covering layer has a soft interlayer, the height of the hole is less than 2m, the hole diameter is larger, and no filling is carried out.
And (3) three-stage area: the field area is a medium stable field or a stable field; in this embodiment, the cavern is smaller than 2m, or the cavern is higher than 2m, and the hole diameter is larger, but is filled with more than plastic silty clay or dense sandy soil.
The subgrade karst collapse consequence of the extremely unstable site is extremely serious; the subgrade karst collapse consequence of the unstable site is serious; the consequences caused by the collapse of the subgrade karst of the medium-stable site and the stable site are general.
In addition, the risk of the karst area is evaluated, the ground collapse prediction degree can be judged according to the comprehensive evaluation of the karst development degree, the thickness and the structure of the rock-soil body, the groundwater level and the change of the groundwater level and other main factors, and the ground collapse prediction degree grade of the field area is divided.
Factors influencing the degree of ground collapse prediction include: and determining the values of the factors in turn according to the weights of the influencing factors, so as to determine the index score of the ground collapse prediction degree, and determining the ground collapse prediction degree grade according to the index score.
The specific process for determining the grade of the prediction degree of the ground collapse comprises the following steps: if the index is more than or equal to 90, the area is an extremely easy collapse area; if the index is 71-89, the area is an easily collapsed area; if the index score is less than or equal to 70, the area is not easy to collapse.
In addition, if a collapse region is generated recently, the index is 100; the water index is 40 when the ground surface precipitation infiltrates into the collapse area.
Specifically, the weight of the water level accounts for 40 points, if the water level can fluctuate up and down on the soil-rock interface, the value is 40, and if the water level cannot fluctuate up and down on the soil-rock interface, the value is 20; the weight ratio of the soil property to the soil layer structure is 20 points, if the soil is cohesive soil, the value is 10, if the soil is sandy soil, the value is 20, if the soil is weathered sand shale, the value is 10, and if the soil is a multi-element structure, the value is 20; the weight proportion of the thickness of the soil layer is 10, if the weight proportion is less than 10m, the score is 10, if the weight proportion is 10-20 m, the score is 7, and if the weight proportion is more than 20m, the score is 5; the weight proportion of the landform is 15 points, if the landform is plain, valley land and erosion depression, the value is 15 points, and if the landform is valley slope and hill, the value is 5 points; the weight ratio of the development degree of the karst is 15, if the number of the funnels, the depressions, the water falling holes, the dissolving tanks, the stone teeth, the vertical shafts, the underground rivers and the dissolving holes is more, the score is 10-15, and if the number of the funnels, the depressions, the water falling holes, the dissolving tanks, the stone teeth, the vertical shafts, the underground rivers and the dissolving holes is less, the score is 5-9.
The evaluation criteria of the degree of prediction of the ground collapse in this example were as follows in table 1:
TABLE 1 reference standard for karst ground subsidence prediction analysis
And 4, step 4: screening the position range of the karst subgrade section of the field;
comprehensively considering the accident occurrence result and the ground predicted collapse degree, comprehensively judging and grading according to a risk evaluation result, and dividing a field into a high-risk area, a medium-risk area and a low-risk area:
(1) high risk area: an extremely collapse region, a first-level region and an easily collapse region;
(2) moderate risk area: a secondary region, a tertiary region and an easily collapsed region;
(3) low risk area: tertiary region, area of difficult collapse.
In the above, the first-level region + the collapse prone region means that the field region belongs to both the first-level region and the collapse prone region; the third-level region + the collapse prone region means that the field region belongs to the third-level region and also belongs to the collapse prone region.
After grading, screening out the set range of the karst subgrade section of the field: the high risk area and the medium risk area are treatment areas and are correspondingly treated, and the low risk area is an area excluding non-treatment.
For the high-risk area, the treatment method is as follows: and the covering layer and the karst cave are treated by adopting a composite foundation. For the areas with medium risk, processing modes such as digging and removing and dynamic compaction are adopted, specific processing modes (digging and removing within 5 meters and dynamic compaction above 5 meters) can be adopted according to specific conditions, and the areas with low risk are not processed.
After safety risk assessment, the method adopts different treatment modes according to different dangerous areas, achieves economical and reasonable treatment effects, and can be used for similar projects to refer to.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A method for screening the range of a karst subgrade section is characterized by comprising the following steps:
detecting a karst area, and dividing the development degree grade of the karst according to detection data;
dividing the stability of the karst of the field based on the development degree grade of the karst;
evaluating the risk of the karst area according to the karst stability of the field;
and classifying the danger level of the field area based on the risk of the karst area, and screening the position range of the karst road bed section.
2. The screening method according to claim 1, wherein the degree of development of the karst is divided into four grades: a karst extremely strong development area, a karst medium development area and a karst weak development area.
3. The screening method of claim 2, wherein if the hole-encountering rate of the drilled hole is greater than 60%, or the surface karst development density is greater than 10/km2Or the karst rate of the drilling line is more than 20 percent, or the development depth of the karst trough and the beaded vertical karst cave exceeds 50m, or the gradient angle of the rock-soil interface of the hidden karst rock-soil>30 degrees, the field region is a karst extremely strong development region; if the hole-encountering rate of the drilled hole is 30-60%, or the development density of the surface karst is 6-10/km2Or the karst rate of the drilling line is 10-20%, or the development depth of the karst trough and the beaded vertical karst cave is 20-50 m, or the gradient angle of the invisible karst rock-soil interface is 15-30 degrees, and the field area is a karst strong development area.
4. The screening method according to claim 2, wherein the hole-encountering rate is 10-30% or the density of the surface karst development is 1-5/km2Or the karst rate of the drilling line is 3-10 percent, or the gradient angle of the invisible karst rock-soil interface is 10-15 degrees, and the field area is a karst medium development area; if the hole-meeting rate of the drill hole is less than 10 percent, or the karst rate of the drill hole line is less than 3 percent, or the gradient angle of the rock-soil interface of the hidden karst rock-soil<And 10 degrees, the field region is a karst weak development region.
5. The screening method according to claim 2, wherein the field is an extremely unstable field if the field is a very strong karst development area or the field contains a karst water enrichment area and a drainage zone; if the field area is a karst strong development area, or a section which contains buried funnels and troughs and is covered with soft soil bodies, or the karst water in the field area is not smoothly drained, or the field area has a multi-layer soil body structure, the field area is an unstable area; if the field area is a karst medium development area, the field area is a medium stable field; and if the field area is a karst weak development area, the field area is a stable field.
6. The screening method of claim 5, wherein in assessing the risk of the karst area, the field is ranked by field karst stability as: a primary area: the field area is an extremely unstable field; and (3) secondary area: the field area is an unstable field; and (3) three-stage area: the field area is a medium stable field or a stable field.
7. The screening method of claim 6, wherein in assessing the risk of the karst area, determining a level of predicted level of ground collapse of the site: factors influencing the degree of ground collapse prediction include: and determining the values of the factors in turn according to the weights of the influencing factors, so as to determine the index score of the ground collapse prediction degree, and determining the ground collapse prediction degree grade according to the index score.
8. The screening method according to claim 7, wherein the specific process of determining the level of the degree of prediction of the ground collapse is as follows: if the index is more than or equal to 90, the area is an extremely easy collapse area; if the index is 71-89, the area is an easily collapsed area; if the index score is less than or equal to 70, the area is not easy to collapse.
9. The screening method according to claim 8, wherein the field area is divided into a high-risk area, a medium-risk area and a low-risk area according to the karst area risk assessment result:
high risk area: an extremely collapse region, a first-level region and an easily collapse region;
moderate risk area: a secondary region, a tertiary region and an easily collapsed region;
low risk area: tertiary region, area of difficult collapse.
10. The screening method of claim 9, wherein after classification, the field karst section position ranges are screened out: the high risk area and the medium risk area are treatment areas, and the low risk area is a non-treatment area.
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