CN105701345B - A kind of evaluation method of drill-pouring pile foundation collapse hole risk and application - Google Patents
A kind of evaluation method of drill-pouring pile foundation collapse hole risk and application Download PDFInfo
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Abstract
Evaluation method and its application the invention discloses a kind of drill-pouring pile foundation collapse hole risk, the present invention is based on the basic principles of fuzzy mathematics theory, differentiated by multiplicity, the fuzzy synthetic appraisement method that bored concrete pile wall stability and collapse hole risk are analyzed and judged.Fuzzy Evaluation Method can not only be evaluated and sorted by the size of comprehensive scores to evaluation object, but also can according to the value on fuzzy evaluation collection as maximum membership grade principle go evaluation object belonging to opinion rating.This just overcomes the monistic defect of traditional mathematics methods and results, the informative that result includes.This method is simple and feasible, and on the problem of some traditional views can not carry out quantitative analysis, it can well solve the ambiguity and uncertain problem of many engineering stability evaluations.
Description
Technical field
The present invention relates to Discussed And Analyzed The Stability of Wall of Bored and evaluation and prevention and control field, and in particular to a kind of drilling fills
Note evaluation method and the application of pile foundation collapse hole risk.
Background technology
Area In The Coast of Southeast China it is widely distributed marine facies, lacustrine facies and river facies deposition weak stickiness soil layer, it is aqueous
Amount is big, intensity is low, compressibility is high, bad hydraulic permeability, buries deep the characteristics of being such soil, can be generated under load action quite big
Sedimentation and differential settlement, bearing capacity and stability also tend to that engine request cannot be met, therefore bored concrete pile is as this area
The normal method of base processing.However, cast-in-situ bored pile hole wall destabilization problems be cast-in-situ bored pile work progress in generally existing
And the Important Project problem of puzzlement is received always, and it is careless slightly in the construction process, the construction qualities such as undergauge, collapse hole easily occur
Accident.It is always the key for influencing and determining Grouting Pile Engineering of Drilling Hole quality and construction speed that cast-in-situ bored pile hole wall collapse, which destroys,
Factor and problem, and it has been increasingly becoming " bottleneck " of many large-diameter borehole Pile Grouting quality and construction speed.
The unstable formation of the cast-in-situ bored pile hole wall soil body, to develop and eventually lead to hole wall collapse be one non-linear, multiple
Miscellaneous system change process, not only there is close related to the engineering geology background condition in area and construction technology condition etc.
Relationship, and it is often depending on influencing the comprehensive function of the various factors of wall stability again.The factor device to hole but above-mentioned cause is collapsed
The effect size that wall caves in and influence degree are again different, and cause factor of collapsing is not only numerous, and form with cause collapse mechanism and
Action rule is extremely complex, and each factor contributions are of different sizes；There are certain contacts each other for some of which factor；The factor is retouched
State mode diversification (qualitative, sxemiquantitative, quantitative diversified forms)；Factor information is random, fuzzy and uncertain, drill-pouring stake holes
The evaluation of wall stability and collapse hole risk is exactly the evaluation procedure of multifactor, multi objective a complexity, it is impossible to merely be made good use of
Distinguish and evaluate with badly, therefore, how influence of the comprehensive considering various effects to wall stability, it is objective, comprehensive, accurately
Synthetical Analysis and Appraising is carried out to Engineering Zone bored pile construction wall stability and collapse hole risk, effectively determines collapse hole
Main prevention region and Optimized Control scheme, not only with important theory significance also with great practical engineering application valency
Value.
At present, the evaluation to Engineering Zone cast-in-situ bored pile wall stability and collapse hole risk of maturation not yet both at home and abroad
Theoretical and method.On the whole, in the main generation in field, is evaluated in cast-in-situ bored pile wall stability research and analysis both at home and abroad at present
Table method can be divided into three classes：First, using mechanics analysis model, by analyzing under the conditions of each influence factor around hole wall
The distribution of stress is deduced the pass between wall stability and hole wall collapse influence factor during bored pile construction
System, and finally propose corresponding hole wall anti-sloughing technique measure.But this method need to establish on relatively more hypothesis and
It is difficult to will qualitatively influence factor it take into account；Second is that using finite element software, to influence each factor of wall stability into
Row sunykatuib analysis qualitatively differentiates cast-in-situ bored pile wall stability, and proposes to administer according to the influence factor of wall stability
Measure.But this method is caved in the analysis of influence factor and commenting for stability just for specified engineering or region inner hole wall
Valency, and can not obtain a unified analysis method, it is difficult to promote the use of, there is certain limitation；Third, to pass through statistics
Data cause factor progress analysis and evaluation of collapsing to single.Such method shortcoming is that the quantitative cause factor of collapsing can only be modeled
Analysis, can not to it is qualitative cause collapse factor carry out Synthetical Analysis and Appraising, it is impossible to it is objective, comprehensive, accurately to Engineering Zone drill
Filling pile construction wall stability and collapse hole risk carry out Synthetical Analysis and Appraising, to the prevention of cast-in-situ bored pile collapse hole problem
Guidance has limitation.
Invention content
The purpose of the present invention is to solve technical problems in the prior art, provide a kind of drill-pouring pile foundation
The evaluation method of collapse hole risk, basic principle of this method based on fuzzy mathematics theory are established one kind and are sentenced by multiplicity
Not, fuzzy synthetic appraisement method bored concrete pile wall stability and collapse hole risk analyzed and judged, and then to Project Areas
Domain cast-in-situ bored pile collapse hole risk class is divided and is evaluated, and has been taken for different cast-in-situ bored pile collapse hole risk class subregions
Targetedly collapse hole prevention Optimized Measures and scheme provide foundation.
In order to solve the above technical problems, the technical scheme is that：
Application of the fuzzy mathematics theory in drill-pouring ground collapse hole risk assessment.
A kind of evaluation method of drill-pouring pile foundation collapse hole risk, includes the following steps：
1) the determining and evaluation unit classification of cast-in-situ bored pile evaluation region；
2) exploration of evaluation region engineering geology and hydrogeological parameter remembers the measured data of each parameter with determining
Record, these parameters include quantitative assessing index and qualitative evaluation index；
3) quantitative assessing index and the cast-in-situ bored pile hole wall collapse hole Fuzzy comprehensive evaluation for risk of qualitative evaluation index are determined
Grade scale value；
4) weight of each evaluation index is determined using times of ultra standard enabling legislation, and is established according to the weight of each evaluation index
The weight matrix of each evaluation unit；
5) membership function is selected, the evaluation index measured value of each evaluation unit and its Assessment for classification standard value are substituted into and are subordinate to
Membership fuction, solve the corresponding different collapse hole risk class of each evaluation index respectively is subordinate to angle value, and determines that each evaluation is single
The degree of membership fuzzy matrix of meta appraisal index；
6) each evaluation unit priming concrete pile hole is calculated according to the weight matrix of each evaluation unit and degree of membership fuzzy matrix
Wall stability and collapse hole risk class subordinated-degree matrix；
7) according to maximum membership grade principle, bored concrete pile wall stability and collapse hole risk of each evaluation unit etc. are determined
Grade, and determine the subregion of Pile Grouting place construction collapse hole difference prevention grade.
Preferably, in step 1), the determining and evaluation unit classification method of cast-in-situ bored pile evaluation region, including as follows
Step：
Distribution of boreholes region is determined according to Grouting Pile Engineering of Drilling Hole mixture proportioning in construction first, delimit drill-pouring stake holes
Then collapse hole risk assessment region is divided into the square of N number of a × a by wall stability and the boundary in collapse hole risk assessment region
Evaluation unit.
Preferably, in step 2), exploratory spot, depth of exploration to middle weathered rock formation are laid respectively in each evaluation unit.
It is further preferred that quantitative assessing index includes：C1：Sand layer thickness, C2：Layer of sand accounts for soil layer ratio (%), C3：
Layer of sand averagely marks degree of passing through, C4：Sand relative density, C5：Sand average grain diameter, C6：Sand nonuniformity coefficient, C8：Drilling design is deep
Degree, C9：Level of ground water luffing, C10：Groundwater level depth；Qualitative evaluation index includes：C7：Drill soil layer construction.
Preferably, in step 3), determining for the grade scale value of quantitative assessing index includes the following steps：
By the numerical value decile between the maxima and minima of this index measured in step 2), and therefrom choose 3
Grade scale value of the median as this index cast-in-situ bored pile hole wall collapse hole Fuzzy comprehensive evaluation for risk, A1；A2；A3, wherein
A1To A3It is sequentially increased；
With the positively related quantitative assessing index C of wall stability2、C3、C4、C10Corresponding collapse hole low-risk, risk, height
Risk stratification standard is respectively Ai3；Ai2；Ai1；With the quantitative assessing index C of wall stability negative correlation1、C5、C6、C8、C9It is corresponding
Collapse hole low-risk, risk, high risk grade scale be respectively Ai1；Ai2；Ai3；
C7Borehole formation structure carries out assignment to its attribute according to soil layer interlayer complexity, clay is not contained in sand
Its complexity of interlayer is defined as generally, being assigned a value of 1；Definition containing 1-2 layers of clay interlayer is more complicated, is assigned a value of 2；Contain
It haves three layers and the definition of Yi Shang clay interlayer is complex random systems, be assigned a value of 3, i.e. collapse hole low-risk, risk, high risk classification mark
Standard is respectively 1,2,3.
It is further preferred that in step 3), by the maximum value (C of this index measured in step 2)i(max)) and minimum value
Ci(min)Between 4 decile of numerical value, and therefrom choose 3 medians as this index cast-in-situ bored pile hole wall collapse hole risk mould
Paste the grade scale value of overall merit, A1；A2；A3Calculation formula it is as follows：
Preferably, in step 4), the computational methods of i-th of impact factor weight (ω) are as follows：
In formula：ωiThe weighted value of-i-th collapse hole risks and assumptions；CiThe measured value of-i-th impact factor；Ai- the i-th
The grade scale value of three opinion ratings of a collapse hole risks and assumptions,Three opinion ratings of-i-th collapse hole risks and assumptions
Grade scale value arithmetic average.
It is further preferred that in step 4), the weight matrix of n-th of evaluation unit is
ωn=[ω1 ω2 ω3 … ω10] (6)。
Preferably, in step 5), membership function is parabolic π membership function, and specific formula is as follows：
ri1=IF (Xi≥Ai2,0,(IF(Xi≥Ai1,((Ai2-Xi)/(Ai2-Ai1))3,(IF(Xi<Ai1,1))))) (7.1)
ri2=IF (Xi>Ai3,0,(IF(Xi≥Ai2,((Ai3-Xi)/(Ai3-Ai2))3,(IF(Xi≥Ai1,((Xi-Ai1)/
(Ai2-Ai1))3,(7.2)
(IF(Xi<Ai1,0,"")))))))
ri3==IF (Xi≥Ai3,1,(IF(Xi≥Ai2,((Xi-Ai2)/(Ai3-Ai2))3,(IF(Xi<Ai2, 0))))) (7.3),
In formula：XiRefer to the measured value of some evaluation index of each evaluation unit；
ri1、ri2、ri3(III) 3 kind of corresponding low-risk of respectively i-th factor (I), risk (II), high risk collapse hole wind
Dangerous grade membership function value.
It is further preferred that the evaluation index degree of membership fuzzy matrix of n-th of evaluation unit is：
Preferably, n-th of evaluation unit bored concrete pile wall stability and collapse hole risk class subordinated-degree matrix are as follows：
λn=ωnRn=[λn1 λn2 λn3] (9)。
Preferably, in step 7), according to maximum membership grade principle, wall stability and collapse hole risk class degree of membership are determined
Matrix λnMiddle λn1 λn2 λn3Numerical value maximal term determines n-th of evaluation unit bored concrete pile wall stability and collapse hole wind according to the following formula
Dangerous grade：
Preferably, in step 7), the determining method in Pile Grouting place construction collapse hole difference prevention ranking score area, including
Following steps：
1) by the collapse hole risk class of different evaluation unit, typing and the corresponding square net in its geographical location；
2) square net medium to low-risk (I), risk (II), the corresponding region of high risk (III) are divided using drawing tool
Different colours are not plotted as it；
3) according to increase safety coefficient principle, low-risk zoning local included in risk and high risk area is divided into
Corresponding apoplexy danger zone and high risk area, and the boundary of each grade collapse hole risk area is refined, output Pile Grouting place collapse hole
Risk block plan.
Application of the evaluation method in drill-pouring pile foundation collapse hole risk is evaluated.
Beneficial effects of the present invention are：
According to the fuzzy overall evaluation to Pile Grouting place collapse hole risk as a result, being carried out to drilling construction collapse hole problem
Subregion reinforces prevention, and collapse hole high risk area is determined as keypoint control area, collapse hole apoplexy danger zone is determined as generally to prevent area, will
Collapse hole low-risk area is determined as normal construction area, i.e., taking different prioritization schemes and technical measures for different subregions, there is needle
To, have the prevention hole wall destabilization problems of emphasis, improve bored concrete pile drilling construction pore-forming efficiency and quality, while effectively reduce construction
Cost.
The present invention is based on the basic principles of fuzzy mathematics theory, are differentiated by multiplicity, and bored concrete pile hole wall is stablized
Property the fuzzy synthetic appraisement method being analyzed and judged with collapse hole risk.Bored concrete pile wall stability is reflection with collapse hole risk
The degree of wall stability under each impact factor comprehensive function, same index may belong to several ranks simultaneously, only each rank
Subjection degree it is different, it is difficult to be measured with the unified standard of classical mathematical model division.And fuzzy comprehensive evaluation method is
A kind of method evaluated using fuzzy set theory, this method are using the principle of fuzzy relation synthesis, from Multiple factors pair
It is subordinate to a kind of method of the comprehensive judge of grade situation progress by judge things.Fuzzy Evaluation Method not only can be to evaluation object by comprehensive
The size for closing score value is evaluated and is sorted, but also can go to evaluate by maximum membership grade principle according to the value on fuzzy evaluation collection
Opinion rating belonging to object.This just overcomes the monistic defect of traditional mathematics methods and results, the information content that result includes
It is abundant.This method is simple and feasible, and on the problem of some traditional views can not carry out quantitative analysis, it can be solved well
The ambiguity and uncertain problem that many engineering stabilities of having determined are evaluated.Comprehensive Evaluation be to the things of a variety of attributes or
Say its overall good and bad things affected by many factors, these attributes can reasonably be integrated or the totality of factor is commented by making one
Sentence, fuzzy logic is to carry out work by using fuzzy set, be it is a kind of solve inaccurate, imperfect information effective ways,
Its maximum feature is exactly that can handle the initiative and ambiguity of human thinking more naturally with it.Therefore, it is many to these
Factor carries out comprehensive analysis, can just make rational evaluation, judges be related to fuzzy factors and interaction pass in most cases
System, so it is a feasible and more effective approach with the method for fuzzy mathematics judge.
Description of the drawings
Fig. 1 technical solution flow charts；
Fig. 2 Membership Function Distribution figures；
Fig. 3 cast-in-situ bored pile hole wall collapse hole risk assessment regions and evaluation unit divide figure；
Fig. 4 bored concrete pile hole wall collapse hole Risk Comprehensive Evaluation index systems；
Fig. 5 Pile Groutings place collapse hole risk class block plan；
Specific embodiment
Embodiments of the present invention to clearly illustrate below collapse to this area's cast-in-situ bored pile by taking certain Pile Grouting as an example
Hole problem carries out analysis and evaluation.
Important device and piping lane are all using pile foundation, bored concrete pile about 2000 in the engineering project region.But by
In the factors such as the special scall geological conditions of the Project Areas ground and groundwater dynamics, in bored pile construction, often
Often there is more serious collapse hole problem.Grouting Pile Engineering of Drilling Hole place is chosen to its drilling construction wall stability and collapse hole risk
It analyzes and researches.
As shown in Figure 1,
Step 1: the determining and evaluation unit classification of evaluation region
1) bigeminy bench drill hole pouring pile Engineering Zone is determined according to Grouting Pile Engineering of Drilling Hole mixture proportioning in construction first, drawn
Determine the boundary of cast-in-situ bored pile wall stability and collapse hole risk assessment region.
2) collapse hole risk assessment region is divided into the square evaluation unit of 165 25 × 25m (see Fig. 3).
Step 2: the exploration of evaluation region engineering geology and hydrogeological parameter
Exploratory spot is laid at 165 25 × 25m square evaluation units centers in evaluation region respectively, and depth of exploration is extremely
Middle weathered rock formation mainly determines following engineering geology and hydrogeological index and parameter：
1)C1：Sand layer thickness (m)；2)C2：Layer of sand accounts for soil layer ratio (%)；3)C3：Layer of sand averagely marks degree of passing through；4)C4：Sand
Native relative density；5)C5：Sand average grain diameter (mm)；6)C6：Sand nonuniformity coefficient；7)C7：Drill soil layer construction；8)C8：It bores
Hole projected depth (m)；9)C9：Underground water buried depth (m)；10)C10：Level of ground water luffing (m).Data measured is commented respectively with each
Valency unit corresponds to typing Microsoft Excel.
Step 3: cast-in-situ bored pile hole wall collapse hole Risk Comprehensive Evaluation index system and evaluation index grade scale are built
It is vertical.
1) 10 indexs identified in step 2 are built into drilling according to geological conditions, engineering specifications, groundwater condition
Bored concrete pile hole wall collapse hole Risk Comprehensive Evaluation index system (as shown in Figure 4).
2) for quantitative assessing index, by the numerical value between the maxima and minima that this index is determined in step 2
4 deciles are carried out, and therefrom choose 3 medians as this index cast-in-situ bored pile hole wall collapse hole risk fuzzy comprehensive evoluation
Grade scale A1；A2；A3.It is as follows that it calculates step：
3) for the quantitative assessing index C with wall stability negative correlation1、C5、C6、C8、C9That is the bigger collapse hole of index value
Risk is bigger, and corresponding collapse hole low-risk, risk, high risk grade scale are respectively Ai1；Ai2；Ai3。
4) for the positively related quantitative assessing index C of wall stability2、C3、C4、C10, i.e. the bigger collapse hole wind of index value
Danger is lower, and corresponding collapse hole low-risk, risk, high risk grade scale are respectively Ai3；Ai2；Ai1。
5) for qualitative evaluation index C7Borehole formation structure assigns its attribute according to soil layer interlayer complexity
It is worth, its complexity that clay interlayer is not contained in sand is defined as generally, being assigned a value of 1；Definition containing 1-2 layers of clay interlayer
It is more complicated, is assigned a value of 2；Containing have three layers and the definition of Yi Shang clay interlayer be complex random systems, be assigned a value of 3.I.e. collapse hole low-risk,
Risk, high risk grade scale are respectively 1,2,3.Obtained specific evaluation index grade scale is as shown in table 1.
1 evaluation index grade scale of table
Step 4: fuzzy comprehensive evoluation weight determine and weight matrix determine
1) weight of each impact factor is determined using times of ultra standard enabling legislation, i-th of impact factor weight (ω) calculates public
Formula is as follows：
In formula:ωiThe weighted value of-i-th collapse hole risks and assumptions；CiThe measured value of-i-th impact factor；Ai- the i-th
The grade scale value of three opinion ratings of a collapse hole risks and assumptions,Three opinion ratings of-i-th collapse hole risks and assumptions
Grade scale value arithmetic average.
2) n-th evaluation unit weight matrix determines
ωn=[ω1 ω2 ω3 … ω10]。
Step 5: evaluation index degree of membership and fuzzy matrix determine
1) it is parabolic π membership function to select membership function, and membership function is shown in Fig. 1 with distribution map.
2) with EXCEL, the collapse hole risks and assumptions parameter of n-th evaluation unit and evaluation criterion are brought into following degree of membership
Logical function calculating formula, can solve that each factor pair answers three kinds of collapse hole risk class respectively is subordinate to angle value：
ri1=IF (Xi≥Ai2,0,(IF(Xi≥Ai1,((Ai2-Xi)/(Ai2-Ai1))3,(IF(Xi<Ai1,1))))) (7.1)
ri2=IF (Xi>Ai3,0,(IF(Xi≥Ai2,((Ai3-Xi)/(Ai3-Ai2))3,(IF(Xi≥Ai1,((Xi-Ai1)/
(Ai2-Ai1))3,(7.2)
(IF(Xi<Ai1,0,"")))))))
ri3==IF (Xi≥Ai3,1,(IF(Xi≥Ai2,((Xi-Ai2)/(Ai3-Ai2))3,(IF(Xi<Ai2, 0))))) (7.3),
In formula：XiRefer to the measured value of some evaluation index of each evaluation unit.
3) angle value is subordinate to according to three kinds of collapse hole risk class, determines that n-th of evaluation unit evaluation index degree of membership obscures
Matrix：
R in formulai1、ri2、ri3The corresponding low-risk of respectively i-th factor (I), risk (II), (III) 3 kind of high risk are collapsed
Hole risk class membership function value.
Step 6: bored concrete pile wall stability and collapse hole risk evaluation results determine
1) n-th evaluation unit bored concrete pile wall stability and collapse hole risk class subordinated-degree matrix determine
λn=ωnRn=[λn1 λn2 λn3]
2) n-th evaluation unit bored concrete pile wall stability and collapse hole risk class determine
According to maximum membership grade principle, wall stability and collapse hole risk class subordinated-degree matrix λ are determinednMiddle λn1 λn2
λn3Numerical value maximal term determines n-th of evaluation unit bored concrete pile wall stability and collapse hole risk class (being shown in Table 2) according to the following formula：
Step 7: Pile Grouting place construction collapse hole difference prevention ranking score area determines
1) the collapse hole risk class of 165 evaluation units, and typing and its geographical location are determined according to step 4-step 6
Corresponding square net.
2) square net medium to low-risk (I), risk (II), the corresponding region of high risk (III) are divided using drawing tool
It is not plotted as blue, yellow, red.
3) according to increase safety coefficient principle, small range low-risk zoning local included in middle and high risk area is divided into
Corresponding apoplexy danger zone and high risk area, and the boundary of each grade collapse hole risk area is refined, the Pile Grouting place of output is collapsed
Hole risk block plan (see Fig. 5).
4) according to the fuzzy overall evaluation of Pile Grouting place collapse hole risk as a result, to drilling construction collapse hole problem into
Row subregion reinforces prevention, and collapse hole high risk area is determined as keypoint control area, collapse hole apoplexy danger zone is determined as generally to prevent area,
Collapse hole low-risk area is determined as normal construction area, i.e., taking different prioritization schemes and technical measures for different subregions, having
For, have the prevention hole wall destabilization problems of emphasis, improve bored concrete pile drilling construction pore-forming efficiency and quality, while effectively reduce and apply
Work cost.
2 collapse hole risk class assessing zonings result of table
Above-mentioned, although the foregoing specific embodiments of the present invention is described with reference to the accompanying drawings, not to invention protection domain
Limitation, those skilled in the art should understand that, based on the technical solutions of the present invention, those skilled in the art are not required to
It is still within the scope of the present invention to make the creative labor the various modifications or changes that can be made.
Claims (4)
1. a kind of evaluation method of drill-pouring pile foundation collapse hole risk, it is characterised in that：Include the following steps：
1) the determining and evaluation unit classification of cast-in-situ bored pile evaluation region；
2) exploration of evaluation region engineering geology and hydrogeological parameter with determine, the measured data of each parameter is recorded,
These parameters include quantitative assessing index and qualitative evaluation index, quantitative assessing index include：C1：Sand layer thickness, C2：Layer of sand
Account for soil layer ratio, C3：Layer of sand averagely marks degree of passing through, C4：Sand relative density, C5：Sand average grain diameter, C6：Sand heterogeneous system
Number, C8：Drilling design depth, C9：Level of ground water luffing, C10：Groundwater level depth；Qualitative evaluation index includes：C7：Drilling soil
Layer structure；
3) the cast-in-situ bored pile hole wall collapse hole Fuzzy comprehensive evaluation for risk classification of quantitative assessing index and qualitative evaluation index is determined
Standard value, it is specific as follows：By 4 decile of numerical value between the maxima and minima of the quantitative assessing index measured in step 2),
And therefrom choose grade scale of 3 medians as this index cast-in-situ bored pile hole wall collapse hole Fuzzy comprehensive evaluation for risk
Value, A1；A2；A3, wherein A1To A3It is sequentially increased；
With the positively related quantitative assessing index C of wall stability2、C3、C4、C10Corresponding collapse hole low-risk, risk, high risk
Grade scale is respectively Ai3；Ai2；Ai1；With the quantitative assessing index C of wall stability negative correlation1、C5、C6、C8、C9It is corresponding to collapse
Hole low-risk, risk, high risk grade scale are respectively Ai1；Ai2；Ai3；
C7For borehole formation structure, assignment is carried out to its attribute according to soil layer interlayer complexity, clay interlayer is not contained in sand
Its complexity be defined as generally, being assigned a value of 1；Definition containing 1-2 layers of clay interlayer is more complicated, is assigned a value of 2；Contain 3
The definition of layer and Yi Shang clay interlayer is complex random systems, is assigned a value of 3, i.e. collapse hole low-risk, risk, high risk grade scale point
It Wei 1,2,3；
Ai1；Ai2；Ai3Calculation formula it is as follows：
Ci(max)For the maximum value of quantitative assessing index, Ci(min)Minimum value for quantitative assessing index；
4) weight of each evaluation index is determined using times of ultra standard enabling legislation, and is established each according to the weight of each evaluation index
The weight matrix of evaluation unit；It is specific as follows：The computational methods of i-th of impact factor weights omega are as follows：
In formula:ωiThe weighted value of-i-th collapse hole risks and assumptions；CiThe measured value of-i-th impact factor；Ai- i-th collapses
The grade scale value of three opinion ratings of hole risks and assumptions,Point of three opinion ratings of-i-th collapse hole risks and assumptions
The arithmetic mean of instantaneous value of grade standard value；
The weight matrix of n-th of evaluation unit is
ωn=[ω1 ω2 ω3 … ω10] (6)；
5) membership function is selected, the evaluation index measured value of each evaluation unit and its substitution of Assessment for classification standard value are subordinate to letter
Number, solve the corresponding different collapse hole risk class of each evaluation index respectively is subordinate to angle value, and determine that each evaluation unit is commented
The degree of membership fuzzy matrix of valency index；Membership function is parabolic π membership function, and specific formula is as follows：
ri1=IF (Xi≥Ai2,0,(IF(Xi≥Ai1,((Ai2-Xi)/(Ai2-Ai1))3,(IF(Xi<Ai1,1))))) (7.1)
ri3=IF (Xi≥Ai3,1,(IF(Xi≥Ai2,((Xi-Ai2)/(Ai3-Ai2))3,(IF(Xi<Ai2, 0))))) (7.3),
In formula：XiRefer to the measured value of some evaluation index of each evaluation unit,
ri1、ri2、ri33 kinds of corresponding low-risk of respectively i-th factor, risk, high risk collapse hole risk class membership functions
Value；
The evaluation index degree of membership fuzzy matrix of n-th of evaluation unit is：
6) it is steady according to the weight matrix of each evaluation unit and each evaluation unit bored concrete pile hole wall of degree of membership fuzzy matrix calculating
Qualitative and collapse hole risk class subordinated-degree matrix；
N-th of evaluation unit bored concrete pile wall stability and collapse hole risk class subordinated-degree matrix are as follows：
λn=ωnRn=[λn1 λn2 λn3] (9)；
7) according to maximum membership grade principle, the bored concrete pile wall stability of each evaluation unit and collapse hole risk class are determined, and
Determine the subregion of Pile Grouting place construction collapse hole difference prevention grade.
2. evaluation method according to claim 1, it is characterised in that：In step 1), cast-in-situ bored pile evaluation region is really
Fixed and evaluation unit classification method, includes the following steps：
Distribution of boreholes region is determined according to Grouting Pile Engineering of Drilling Hole mixture proportioning in construction first, it is steady to delimit cast-in-situ bored pile hole wall
Then collapse hole risk assessment region is divided into N number of square evaluation unit by the qualitative boundary with collapse hole risk assessment region.
3. evaluation method according to claim 1, it is characterised in that：In step 2), laid respectively in each evaluation unit
Exploratory spot, depth of exploration to middle weathered rock formation.
4. evaluation method according to claim 1, it is characterised in that：In step 7), Pile Grouting place construction collapse hole
The determining method in difference prevention ranking score area, includes the following steps：
1) by the collapse hole risk class of different evaluation unit, typing and the corresponding square net in its geographical location；
2) square net medium to low-risk, risk, the corresponding region of high risk are plotted as by different face using drawing tool respectively
Color；
3) according to increase safety coefficient principle, low-risk zoning local included in risk and high risk area is divided into accordingly
Apoplexy danger zone and high risk area, and refine the boundary of each grade collapse hole risk area, output Pile Grouting place collapse hole risk
Block plan.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610020594.1A CN105701345B (en) | 2016-01-13 | 2016-01-13 | A kind of evaluation method of drill-pouring pile foundation collapse hole risk and application |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610020594.1A CN105701345B (en) | 2016-01-13 | 2016-01-13 | A kind of evaluation method of drill-pouring pile foundation collapse hole risk and application |
Publications (2)
| Publication Number | Publication Date |
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| CN107882549A (en) * | 2016-09-30 | 2018-04-06 | 中国石油天然气集团公司 | A kind of method for determining cast-in-situ bored pile collapse hole degree coefficient |
| CN106640001A (en) * | 2016-11-04 | 2017-05-10 | 中国海洋石油总公司 | Profile control measure effect evaluation method suitable for offshore oilfield |
| CN106894800B (en) * | 2017-02-23 | 2019-05-21 | 中国海洋石油集团有限公司 | A kind of profile control well selection decision-making technique suitable for Offshore Heavy Oil Field oil reservoir |
| CN107092802A (en) * | 2017-04-26 | 2017-08-25 | 石家庄铁道大学 | A kind of shield driving Ground Deformation risk analysis method based on HAZOP from accuracy |
| CN107229820B (en) * | 2017-05-08 | 2019-09-06 | 中国石油天然气股份有限公司 | A kind of evaluation method and device of profile control influence factor |
| CN111339486A (en) * | 2020-02-28 | 2020-06-26 | 青岛理工大学 | Deep foundation pit blasting vibration velocity risk level big data evaluation method |
| CN117057632B (en) * | 2023-10-11 | 2024-01-19 | 北京城建勘测设计研究院有限责任公司 | Method for evaluating precipitation recharging feasibility of pebble layer deep foundation pit |
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