CN104504621A - Method for evaluating utilizability of mountainous area engineering site - Google Patents

Abstract

The invention relates to the technology of engineering geology evaluation, and discloses a method for evaluating the utilizability of a mountainous area engineering site. The method can quickly and accurately evaluate the utilizability of a mountainous area engineering site. The method successively comprises the following steps: evaluating the regional structure stability of the engineering site, evaluating the site stability of the engineering site, and evaluating the foundation stability of the engineering site. On the premise that utilizability is satisfied, the evaluation values of above three indexes are utilized to obtain the suitability evaluation of the engineering site through fuzzy evaluation, finally, the regional structure stability, the site stability and the foundation stability and suitability are used as basic values, the utilizability situation of each selected mountainous area engineering site is obtained by system clustering analysis and a feedback result of a traditional mountainous area engineering site, and a plurality of selected mountainous area engineering sites can be compared and selected. The method is suitable for evaluating the utilizability of a mountainous area engineering site and provides a theoretical basis for engineering construction.

Description

The availability evaluation method of a kind of mountain area engineering ground

Technical field

The present invention relates to Engineering Geology Evaluation technology, be specifically related to the availability evaluation method of a kind of mountain area engineering ground.

Background technology

In conventional art, the availability evaluation for place is all generally from qualitative, and the several index of Main Basis certain or certain judges the utilizability in place, as the index such as construction of stable and place monolithic stability of floor area; Although place availability evaluation result is based on this reliable, be also relatively conservative.Along with the exploitation of water power, the land used condition of southwestern growing tension, makes us need more objectively, accurately for the availability evaluation method in place.In addition, engineering construction is carried out in mountain area, especially in the middle of Southwest Mountainous Areas hydroelectric development process, when selecting multiple mountain areas engineering ground ratio, only from qualitative angle, or stress a certain projecting point to carry out than choosing, and comprehensively than the various aspects selecting place, mountain area, thus also can not just be difficult to the construction place selecting economical rationality the most.

Summary of the invention

Technical matters to be solved by this invention is: the availability evaluation method proposing a kind of mountain area engineering ground, fast, accurately realizes the availability evaluation to mountain area engineering ground.

The present invention solves the problems of the technologies described above adopted technical scheme:

An availability evaluation method for mountain area engineering ground, comprises the following steps:

A. the regional tectonic stability of engineering ground being evaluated, when meeting stability condition, entering step b;

B. the site stability of engineering ground being evaluated, when meeting stability condition, entering step c;

C. the foundation stability of engineering ground being evaluated, when meeting stability condition, entering steps d;

D. utilize the evaluation of estimate of these three indexs of the regional tectonic stability of engineering ground in step a, b, c, site stability, foundation stability, obtained the suitability evaluation of engineering ground by fuzzy evaluation;

E. using regional tectonic stability, site stability, foundation stability and suitability as basic value, utilize hierarchial-cluster analysis, and utilize the feedback result of existing mountain area engineering ground, draw the utilizability situation intending selecting place, mountain area.

Further, the method also comprises:

When the tectonic stability assessment to engineering ground, if do not meet stability condition, then need to select place else; When evaluating the site stability of engineering ground, if do not meet stability condition and still can not use after treatment or not possess salvage value, then need to select place else; When evaluating the foundation stability of engineering ground, if do not meet stability condition and still can not use after treatment or not possess salvage value, then need to select place else.

Further, in step a, to the tectonic stability assessment concrete grammar of engineering ground be:

A1. determine the weighted value of each evaluation points, described weighted value derives from and carries out assignment according to the influence degree of this evaluation points or directly quantize value;

A2. be worth Performance Area domain construction estimation of stability system based on each evaluation points and respective weights thereof and determine the tectonic stability assessment value of engineering ground;

Wherein structural stability system in floor area is as shown in following table one:

Table one: floor area structural stability diagram of system

The described tectonic stability assessment value determining engineering ground, is specially:

$\begin{array}{c}A={\mathrm{\α}}_1\·A_1+{\mathrm{\α}}_2\·A_2+{\mathrm{\α}}_3\·A_3+{\mathrm{\α}}_4\·A_4\\ ={\mathrm{\α}}_1\·\underset{j=1}{\overset{5}{\mathrm{\Σ}}}{A}_{1j}\·{\mathrm{\α}}_{1j}+{\mathrm{\α}}_2\·\underset{j=1}{\overset{4}{\mathrm{\Σ}}}{A}_{2j}\·{\mathrm{\α}}_{2j}+{\mathrm{\α}}_3\·\underset{j=1}{\overset{3}{\mathrm{\Σ}}}{A}_{3j}\·{\mathrm{\α}}_{3j}+{\mathrm{\α}}_4\·\underset{j=1}{\overset{2}{\mathrm{\Σ}}}{A}_{4j}\·{\mathrm{\α}}_{4j}\end{array}$

Wherein, A is the tectonic stability assessment value of engineering ground,

Further, in step b, to the method that the site stability of engineering ground is evaluated be:

B1. determine the weighted value of each evaluation points, described weighted value derives from and carries out assignment according to the influence degree of this evaluation points or directly quantize value;

B2. be worth the site stability evaluation system of engineering ground based on each evaluation points and respective weights thereof and determine the site stability evaluation value of engineering ground;

Wherein, site stability evaluation system is as shown in following table two:

Table two: site stability evaluation system

The described site stability evaluation value determining engineering ground, is specially:

$\begin{array}{c}B={\mathrm{\β}}_1\·B_1+{\mathrm{\β}}_2\·B_2={\mathrm{\β}}_1\·\underset{j=1}{\overset{3}{\mathrm{\Σ}}}{\mathrm{\β}}_{1j}\·B_{1j}+{\mathrm{\β}}_2\·\underset{j=1}{\overset{4}{\mathrm{\Σ}}}{\mathrm{\β}}_{2j}\·B_{2j}\\ ={\mathrm{\β}}_1\·(\underset{j-1}{\overset{2}{\mathrm{\Σ}}}{\mathrm{\β}}_{11}^j\·B_{11}^j+\underset{j-1}{\overset{3}{\mathrm{\Σ}}}{\mathrm{\β}}_{12}^j\·B_{12}^j+{\mathrm{\β}}_{13}\·B_{13})+{\mathrm{\β}}_2\·\underset{i=1}{\overset{4}{\mathrm{\Σ}}}{\mathrm{\β}}_{2i}\·B_{2i}\end{array}$

Wherein, B is the site stability evaluation value of engineering ground;

Further, described in step c to the method that the foundation stability of engineering ground is evaluated be:

C1. the weighted value of each evaluation points is determined; Described weighted value derives from and carries out assignment according to the influence degree of this evaluation points or directly quantize value;

C2. be worth the foundation stability appraisement system of engineering ground based on each evaluation points and respective weights thereof and determine the foundation stability evaluation of estimate of engineering ground;

Wherein, foundation stability appraisement system is as shown in following table three:

Table three: foundation stability appraisement system

The described foundation stability determining engineering ground, specifically comprises:

$C={\mathrm{\λ}}_1\·C_1\·{\mathrm{\λ}}_2\·\underset{i=}{\overset{2}{\mathrm{\Σ}}}{\mathrm{\λ}}_{2i}\·C_{2i}$

Wherein C is the foundation stability evaluation of estimate of engineering ground.

Further, in steps d, utilize the evaluation of estimate of these three indexs of the regional tectonic stability of engineering ground in step a, b, c, site stability, foundation stability, obtained the suitability evaluation of engineering ground by fuzzy evaluation, specifically comprise:

D1. determine the weighted value of these three indexs, described weighted value is determined according to expert estimation;

D2. according to the regional tectonic stability, site stability, the evaluation of estimate of foundation stability and the weighted value determination engineering ground suitability of correspondence that have obtained:

W＝α·A+β·B+λ·C

Wherein, W is engineering ground suitability evaluation value.

The invention has the beneficial effects as follows: from regional stability, slope stablizing, four indexs such as base stabilization and suitability of mountain area engineering ground, practice based on existing mountain area engineering ground is fed back, pass through cluster analysis, mountain area engineering ground to be evaluated is classified as utilizability difference, utilizability is medium and utilizability good, and in this, as intending the foundations of choosing selecting mountain area engineering ground; Owing to considering each factor affecting mountain area engineering ground, on quantitative basis, in conjunction with putting into practice feedback result, it is more accurate to evaluate the utilizability of mountain area engineering ground.

Accompanying drawing explanation

Fig. 1 is evaluation method process flow diagram in the present invention;

Fig. 2 is floor area structural stability system assumption diagram;

Fig. 3 is engineering ground estimation of stability system assumption diagram;

Fig. 4 is engineering ground foundation stability evaluation system structure figure;

Fig. 5 is engineering ground availability evaluation system assumption diagram.

Embodiment

As shown in Figure 1, the present invention is successively through the tectonic stability assessment of engineering ground, the site stability evaluation of engineering ground and the foundation stability evaluation of engineering ground, meeting under available prerequisite, utilize the evaluation of estimate of above-mentioned three indexs, the suitability evaluation of engineering ground is drawn by fuzzy evaluation, last with regional tectonic stability, site stability, foundation stability and suitability are as basic value, utilize hierarchial-cluster analysis, utilize the feedback result of existing mountain area engineering ground, draw the utilizability situation intending selecting place, mountain area, and multiple plan can be carried out select the ratio of mountain area engineering ground to select.

Be specifically described for each evaluation index below in conjunction with accompanying drawing:

1, the tectonic stability assessment of engineering ground

Floor area structural stability is the basis of place, mountain area availability evaluation, the present invention thinks like this: floor area structural stability, on the basis of areal geology structure, consider the interaction of endogenic geological process and tectonic stress condition, the degree of stability on the site district earth's crust and shallow top layer thereof now.Only when Performance Area domain construction stability meets place construction requirements, just can carry out next step evaluation, i.e. mountain area engineering ground floor area estimation of stability, otherwise alternative site, restart to carry out tectonic stability assessment.

As shown in Figure 2, the tectonic stability assessment of mountain area engineering ground comprises multiple secondary evaluation index, and the multiple evaluation points under index.As to regional geological tectonic feature index, it comprises 5 evaluation points such as geotectonic environment, regional tectonics development characteristics, regional stratum petrographic formation, crust uplift speed and topography and geomorphology; For Activity of Faults, it comprises 4 evaluation points such as distribution of active fault, activity rate, fracture mode and latest activity age; To neotectonics activity and earthquake, it comprises earth's crust rock mass stress-deformation effect 4 evaluation points such as feature, maximum effect earthquake magnitude, earthquake motion peak acceleration and basic earthquake intensity now; To ground stress characteristics index, it comprises 2 evaluation points such as tectonic stress state and fracture spatial relationship, tectonic stress value etc.

1.2 evaluation method

Mountain area engineering ground Regional stability estimation method is based on above-mentioned 4 evaluation indexes and 15 evaluation points.Because the influence degree of the different evaluation factor is different, can be evaluated by the weight of establishing evaluation points, the weighted value of each evaluation points is determined by expert graded.It should be noted that, evaluation points is as requirement, to quantifiable indicator then direct value, to directly value index then can not carrying out assignment by influence degree: high (50), medium (30), low (20), and normalization process (formula 1) need be carried out to it, reach unified to make value in appraisement system and prevent some evaluation points to be subject to excessive constraining; For the determination of evaluation points weight, in order to make the assignment of weight have more science, objectivity and authenticity, can by the method determination weighted value of expert opinion.

${A^{\′}}_{\mathrm{ij}}=\frac{A_{\mathrm{ij}}}{\underset{j}{\mathrm{\Σ}}{A}_{\mathrm{ij}}}$ Formula 1

A in formula _ijthe basic value of a jth factor in-the i-th index;

A ' _ijthe basic value of a jth factor in i-th index after-normalization process.

After normalization process, then there is 0≤A ' _ij≤ 1.

So, by evaluation points and evaluation points weight, then can draw floor area structural stability system and determine its basic value to the availability evaluation in power engineering construction place.

Appraisement system and basic value calculating formula are in table 1.1 and formula 2.

Table 1.1 mountain area engineering ground tectonic stability assessment diagram of system

According to basic value and the evaluation weight of each evaluation points of upper table establishment, the stable basic value in floor area (A) can be calculated by through type 2.

$A_i=\underset{j}{\mathrm{\Σ}}{A}_{\mathrm{ij}}\·{\mathrm{\α}}_{\mathrm{ij}}$

$\begin{array}{c}A={\mathrm{\α}}_1\·A_1+{\mathrm{\α}}_2\·A_2+{\mathrm{\α}}_3\·A_3+{\mathrm{\α}}_4\·A_4\\ ={\mathrm{\α}}_1\·\underset{j=1}{\overset{5}{\mathrm{\Σ}}}{A}_{1j}\·{\mathrm{\α}}_{1j}+{\mathrm{\α}}_2\·\underset{j=1}{\overset{4}{\mathrm{\Σ}}}{A}_{2j}\·{\mathrm{\α}}_{2j}+{\mathrm{\α}}_3\·\underset{j=1}{\overset{3}{\mathrm{\Σ}}}{A}_{3j}\·{\mathrm{\α}}_{3j}+{\mathrm{\α}}_4\·\underset{j=1}{\overset{2}{\mathrm{\Σ}}}{A}_{4j}\·{\mathrm{\α}}_{4j}\end{array}$ Formula 2

In formula, each parameter refers to table 1.1.

To sum up, by evaluation points and the computing method of table 1.1 and formula 2, the quantized value of mountain area engineering ground local tectonic stability can be determined, thus as the basic value of mountain area engineering ground suitability evaluation.

2, the estimation of stability of mountain area engineering ground

Through floor area estimation of stability, then can carry out the next stage of mountain area engineering ground availability evaluation: engineering ground estimation of stability.Whether its evaluation result directly decides site and can adopt: directly adopt, adopt after treatment or do not have salvage value and directly abandon alternative site.Its evaluation content mainly comprises: place inner stability against sliding, place periphery exogenic process.Its evaluation system structure is see Fig. 3.

2.1 evaluation index

Mountain area engineering ground site stability evaluation index comprises the inner stability against sliding in place and place periphery exogenic process.Wherein the inner Against Sliding Stability in place mainly comprise place side slope stress-strain distribution, accumulation body stable with basement rock the evaluation points such as stable; Place periphery exogenic process mainly comprises: the evaluation points such as landslide, rubble flow, Slope Rock Mass avalanche (falling) and the effect of surface water water eroding and flooding.

2.2 evaluation method

Mountain area of the present invention engineering ground estimation of stability mainly comprises 2 secondary evaluation indexes and multiple evaluation points thereof.The evaluation index of the inner Against Sliding Stability in place comprises Q ₄accumulation body is stable, basement rock is stable and place side slope stress-strain distribution feature; Exogenic process impact comprises: avalanche, landslide, rubble flow and the effect of surface water water eroding and flooding.The normalization of evaluation index, evaluation points and weight and process are with the evaluation method of floor area structural stability.The weighted value of each evaluation index and evaluation points is still determined by expert graded.The site stability evaluation system of mountain area engineering ground and each index are as shown in table 2.1, and its quantum chemical method as shown in Equation 3.

The site stability evaluation diagram of system of table 2.1 mountain area engineering ground

So the evaluation weight of establishing according to table 2.1 and factor parameter, then can calculate the basic value (B) of mountain area engineering ground site stability by formula 3:

$B_i=\underset{j}{\mathrm{\Σ}}{B}_{\mathrm{ij}}\·B_{\mathrm{ij}}$

$\begin{array}{c}B={\mathrm{\β}}_1\·B_1+{\mathrm{\β}}_2\·B_2={\mathrm{\β}}_1\·\underset{j=1}{\overset{3}{\mathrm{\Σ}}}{\mathrm{\β}}_{1j}\·B_{1j}+{\mathrm{\β}}_2\·\underset{j=1}{\overset{4}{\mathrm{\Σ}}}{\mathrm{\β}}_{2j}\·B_{2j}\\ ={\mathrm{\β}}_1\·(\underset{j-1}{\overset{2}{\mathrm{\Σ}}}{\mathrm{\β}}_{11}^j\·B_{11}^j+\underset{j-1}{\overset{3}{\mathrm{\Σ}}}{\mathrm{\β}}_{12}^j\·B_{12}^j+{\mathrm{\β}}_{13}\·B_{13})+{\mathrm{\β}}_2\·\underset{i=1}{\overset{4}{\mathrm{\Σ}}}{\mathrm{\β}}_{2i}\·B_{2i}\end{array}$ Formula 3

In formula, basic parameter is in table 2.1.

With the tectonic stability assessment of mountain area engineering ground, the B value that through type 3 is determined is the quantized value of mountain area engineering ground site stability evaluation, and it can be used as the basic value of mountain area engineering ground suitability evaluation basic index engineering ground site stability.

3, the foundation stability evaluation of mountain area engineering ground:

By to after floor area, mountain area structural stability and engineering ground site stability evaluation, when local tectonic stability and slope stablizing satisfy condition, the 3rd index of mountain area engineering ground availability evaluation can be carried out: mountain area engineering ground foundation stability is evaluated.Its appraisement system as shown in Figure 3.

3.1 evaluation index

Mountain area engineering ground foundation stability evaluation comprises the stable and place foundation settlement deformation of place foundation bearing capacity and stablizes.Wherein place foundation settlement deformation is stable comprises foundation settlement deformation amount and ground unevenness sedimentation two evaluation points.

3.2 evaluation method

To sum up, the evaluation of engineering ground foundation stability comprises the stable and place foundation settlement deformation of place foundation bearing capacity and stablizes.Only consider whether foundation bearing capacity meets given tensile load requirement herein for place foundation bearing capacity is stable; Place foundation settlement deformation is stable comprises foundation settlement deformation amount and the sedimentation of ground unevenness, be different from regional stability and slope stablizing, place base stabilization evaluation is the comparison between quantization parameter, comparative result meets or does not meet, for discontented can be divided into process completely after meet and do not meet after process, after process, choosing then can be abandoned in ungratified place, to evaluation points value desirable 60 available after process, and originally just meet desirable 40.Must be noted that for any one index, wherein any one place ground that can't meet the demands after basement process, then should select site else, stops the availability evaluation in place.To evaluation points and factor normalized same as above, the determination of the weighted value of each evaluation points is determined by expert graded.

Mountain area engineering ground foundation stability appraisement system and evaluation points are as shown in table 3.1.

Table 3.1 mountain area engineering ground foundation stability appraisement system table

According to the evaluation points determined in table 3.1 and weight, then can calculate the basic value (C) of engineering ground foundation stability evaluation by formula 4:

$C={\mathrm{\λ}}_1\·C_1\·{\mathrm{\λ}}_2\·\underset{i=}{\overset{2}{\mathrm{\Σ}}}{\mathrm{\λ}}_{2i}\·C_{2i}$ Formula 4

In formula, parameter is in table 3.1.

With tectonic stability assessment and the site stability evaluation of mountain area engineering, the value that through type 4 is determined is the basic value that mountain area engineering ground foundation stability is evaluated, and can be used as the basic value of place, mountain area suitability evaluation.

4, mountain area engineering ground suitability evaluation:

The suitability evaluation of mountain area engineering ground is based upon on basis that the Regional stability estimation of mountain area engineering ground, site stability evaluation and foundation stability evaluate, i.e. the Domain Stability in place, mountain area, site stability and foundation stability.

Detailed process: be successively after floor area structural stability, engineering ground site stability evaluation and the evaluation of engineering ground foundation stability.On the basis of the basic value of each evaluation index determined, the weighted value being multiplied by a stage by the evaluation of estimate in each stage is again obtained by expert graded, can draw mountain area engineering ground suitability evaluation value, its appraisement system and each evaluation points are as shown in table 4.1 and 4.2.

Table 4.1 mountain area engineering ground suitability evaluation system

Table 4.2 mountain area engineering ground suitability evaluation index and the factor

So, by mountain area engineering ground suitability evaluation system and each basic value of determining, determine the basic value of mountain area engineering ground suitability evaluation by formula 5.

W=α A+ β B+ λ C formula 5

Formula 2,3,4 is substituted into above formula, then has the COMPREHENSIVE CALCULATING formula of mountain area engineering ground suitability evaluation value as follows:

$\begin{array}{c}W=(\mathrm{\α}\·\underset{j=1}{\overset{5}{\mathrm{\Σ}}}{A}_{1j}+{\mathrm{\α}}_{1j}+\underset{j=1}{\overset{4}{\mathrm{\Σ}}}{A}_{2j}\·{\mathrm{\α}}_{2j}+\underset{j=1}{\overset{3}{\mathrm{\Σ}}}{A}_{3j}\·{\mathrm{\α}}_{3j}+\underset{j=1}{\overset{4}{\mathrm{\Σ}}}{A}_{4j}\·{\mathrm{\α}}_{4j})\\ +\mathrm{\β}\·(\underset{j-1}{\overset{2}{\mathrm{\Σ}}}{\mathrm{\β}}_{11}^j\·B_{11}^j+\underset{j-1}{\overset{3}{\mathrm{\Σ}}}{\mathrm{\β}}_{12}^j\·B_{12}^j+{\mathrm{\β}}_{13}\·B_{13}+\underset{i=1}{\overset{3}{\mathrm{\Σ}}}{\mathrm{\β}}_{2i}\·B_{2i})+\mathrm{\λ}({\mathrm{\λ}}_1\·C_1+\underset{i=}{\overset{2}{\mathrm{\Σ}}}{\mathrm{\λ}}_{2i}\mathrm{\β}\·C_{2i})\end{array}$ Formula 6

In formula: α, β, λ be floor area structural stability, engineering ground site stability and the weighted value of engineering ground foundation stability in the engineering ground suitability evaluation of mountain area respectively, determined by expert graded.

5, the availability evaluation of mountain area engineering ground:

After the Domain Stability of mountain area engineering ground, site stability, foundation stability and suitability evaluation, can evaluate the utilizability of mountain area engineering ground.And its using value is mainly the place ratio choosing when engineering construction addressing, thus select the construction place of economical rationality the most.The appraisement system in engineering construction place, mountain area as shown in Figure 5.

In sum, a series of basic values of mountain area engineering ground suitability evaluation can be obtained by method of the present invention, but for such basic value, how go to judge its utilizability, can be divided into: poor, the medium utilizability of utilizability should utilizability.Thus, this patent, on the basis of existing mountain area engineering ground availability evaluation, carries out cluster analysis to mountain area engineering ground to be evaluated.

Detailed process is: by the evaluation of existing typical mountain region engineering ground, and as engineering experience, utilize the cluster analysis of Q type (between needs study sample and sample during relation, general distance coefficient statistic or similar statistics amount are as classified calculating foundation), the suitability value in target place and each index, factor values and existing engineering ground are carried out hierarchial-cluster analysis, according to distance statistics amount or similar statistics amount, target place is sorted out.Specifically classify as: if the distance statistics amount in a certain existing engineering ground and target place or similar statistics amount reach minimum value (utilizability in existing place judges by putting into practice to feed back), then can represent the utilizability state in target place according to the utilizability of this existing engineering ground.So, according to above-mentioned thought, then can set up the mathematical expression of place utilizability, according to the foundation of mathematic(al) representation, then can carry out sequencing to place availability evaluation.Its mathematic(al) representation following (distance statistics amount):

Existing engineering: $\left(\begin{array}{c}{G}_1\\ G_2\\ .\\ .\\ .\\ G_i\\ .\\ .\\ .\\ G_n\end{array}\right)=\begin{array}{c}\left(\begin{array}{cccc}{W}_1& A_1& B_1& C_1\\ W_2& A_2& B_2& C_2\\ .& .& .& .\\ .& .& .& .\\ .& .& .& .\\ W_i& A_i& B_i& C_i\\ .& .& .& .\\ .& .& .& .\\ .& .& .& .\\ W_n& A_n& B_n& C_n\end{array}\right)=\left(\begin{array}{cccc}{a}_{11}& a_{12}& a_{13}& a_{14}\\ a_{21}& a_{22}& a_{23}& a_{24}\\ .& .& .& .\\ .& .& .& .\\ .& .& .& .\\ a_{i1}& a_{i2}& a_{i3}& a_{i4}\\ .& .& .& .\\ .& .& .& .\\ .& .& .& .\\ a_{n1}& a_{n2}& a_{n3}& a_{n4}\end{array}\right)\end{array}$

Purpose project: (G)=(W A B C)=(a ₁a ₂a ₃a ₄)

For preventing parameter from causing some factor be subject to excessive amplification or constrain because of too small or excessive, can be normalized each basic value:

$a_{i1\left(\mathrm{2,3,4}\right)}=\frac{W(A,B,C)}{\mathrm{\Σ}\{W,A,C,D\}}$

In formula: H=(G ₁g ₂g _ig _n) ^tfor n existing engineering;

G-target mountain area engineering ground, W-purpose project place suitability evaluation value, A-purpose project floor area Stability Assessment value, B-purpose project place site stability evaluation value, C-target place foundation stability evaluation of estimate;

W _i-the i-th existing mountain area engineering ground suitability evaluation value, calculates according to formula 6;

A _i-the i-th existing mountain area engineering ground Regional stability estimation value, calculates according to formula 2;

B _i-the i-th existing mountain area engineering ground site stability evaluation value, calculates according to formula 3;

C _i-the i-th existing mountain area engineering ground foundation stability evaluation of estimate, calculates according to formula 4;

A _ij-each evaluation of estimate after normalized.

Adopt Euclidean distance as the distance statistics amount of existing engineering and purpose project intersite:

$d_i={\left[\underset{j=1}{\overset{4}{\mathrm{\Σ}}}{(a_j-a_{\mathrm{ij}})}^2\right]}^{\frac{1}{2}}$

Purpose project and existing engineering is then had to have a distance statistics amount:

D＝(d ₁d ₂… d ₃… d _n)

Get least member d in D _i.Existing, there is d _min{ G, G _i, then purpose project place utilizability can be classified as the utilizability of i-th existing engineering ground.

By above-mentioned analysis, minor increment statistic is one and important statistical value.For target mountain area engineering ground, minor increment statistic can be utilized to be classified as the utilizability of a certain mountain area engineering ground, but also there is a problem simultaneously: when minor increment statistic is no more than certain value, result is only reliably.Due to herein only redefine upper analysis, this value will not be considered herein.Also it should be noted that simultaneously, construction place utilizability after hierarchial-cluster analysis, to on the evaluation in once certain target place time can be used as existing engineering, namely after evaluating a place each time, just can increase an existing engineering of cluster analysis, and development is gone down successively, then cluster analysis database of can enriching constantly, thus to the evaluation of the utilizability in target place, there is higher reliability.

To sum up, the availability evaluation of mountain area engineering ground is mainly from the regional stability of mountain area engineering ground, slope stablizing, four layer gos out such as base stabilization and suitability, practice based on existing mountain area engineering ground is fed back, pass through cluster analysis, mountain area engineering ground to be evaluated is classified as utilizability difference, utilizability is medium and utilizability good, and in this, as intending the foundations of choosing selecting mountain area engineering ground.

Claims (6)

1. an availability evaluation method for mountain area engineering ground, is characterized in that, comprise the following steps:

A. the regional tectonic stability of engineering ground being evaluated, when meeting stability condition, entering step b;

B. the site stability of engineering ground being evaluated, when meeting stability condition, entering step c;

C. the foundation stability of engineering ground being evaluated, when meeting stability condition, entering steps d;

D. utilize the evaluation of estimate of these three indexs of the regional tectonic stability of engineering ground in step a, b, c, site stability, foundation stability, obtained the suitability evaluation of engineering ground by fuzzy evaluation;

E. using regional tectonic stability, site stability, foundation stability and suitability as basic value, utilize hierarchial-cluster analysis, and utilize the feedback result of existing mountain area engineering ground, draw the utilizability situation intending selecting place, mountain area.

2. the availability evaluation method of a kind of mountain area as claimed in claim 1 engineering ground, it is characterized in that, the method also comprises:

When the tectonic stability assessment to engineering ground, if do not meet stability condition, then need to select place else; When evaluating the site stability of engineering ground, if do not meet stability condition and still can not use after treatment or not possess salvage value, then need to select place else; When evaluating the foundation stability of engineering ground, if do not meet stability condition and still can not use after treatment or not possess salvage value, then need to select place else.

3. the availability evaluation method of a kind of mountain area as claimed in claim 1 engineering ground, is characterized in that, in step a, to the tectonic stability assessment concrete grammar of engineering ground is:

A1. determine the weighted value of each evaluation points, described weighted value derives from and carries out assignment according to the influence degree of this evaluation points or directly quantize value;

A2. be worth Performance Area domain construction estimation of stability system based on each evaluation points and respective weights thereof and determine the tectonic stability assessment value of engineering ground;

Wherein structural stability system in floor area is as shown in following table one:

Table one: floor area structural stability diagram of system

The described tectonic stability assessment value determining engineering ground, is specially:

Wherein, A is the tectonic stability assessment value of engineering ground,

4. the availability evaluation method of a kind of mountain area as claimed in claim 3 engineering ground, is characterized in that, in step b, to the method that the site stability of engineering ground is evaluated is:

B1. determine the weighted value of each evaluation points, described weighted value derives from and carries out assignment according to the influence degree of this evaluation points or directly quantize value;

B2. be worth the site stability evaluation system of engineering ground based on each evaluation points and respective weights thereof and determine the site stability evaluation value of engineering ground;

Wherein, site stability evaluation system is as shown in following table two:

Table two: site stability evaluation system

The described site stability evaluation value determining engineering ground, is specially:

Wherein, B is the site stability evaluation value of engineering ground;

5. the availability evaluation method of a kind of mountain area as claimed in claim 4 engineering ground, is characterized in that, described in step c to the method that the foundation stability of engineering ground is evaluated is:

C1. the weighted value of each evaluation points is determined; Described weighted value derives from and carries out assignment according to the influence degree of this evaluation points or directly quantize value;

C2. be worth the foundation stability appraisement system of engineering ground based on each evaluation points and respective weights thereof and determine the foundation stability evaluation of estimate of engineering ground;

Wherein, foundation stability appraisement system is as shown in following table three:

Table three: foundation stability appraisement system

The described foundation stability determining engineering ground, specifically comprises:

Wherein C is the foundation stability evaluation of estimate of engineering ground.

6. the availability evaluation method of a kind of mountain area as claimed in claim 5 engineering ground, it is characterized in that, in steps d, utilize the evaluation of estimate of these three indexs of the regional tectonic stability of engineering ground in step a, b, c, site stability, foundation stability, obtained the suitability evaluation of engineering ground by fuzzy evaluation, specifically comprise:

D1. determine the weighted value of these three indexs, described weighted value is determined according to expert estimation;

D2. according to the regional tectonic stability, site stability, the evaluation of estimate of foundation stability and the weighted value determination engineering ground suitability of correspondence that have obtained:

W＝α·A+β·B+λ·C

Wherein, W is engineering ground suitability evaluation value.