CN108411887B - The method for improving soil body forced ramming reinforcing effect between adjacent tamping point in coarse-grained soil ground - Google Patents
The method for improving soil body forced ramming reinforcing effect between adjacent tamping point in coarse-grained soil ground Download PDFInfo
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Abstract
The present invention provides the method for soil body forced ramming reinforcing effect between adjacent tamping point in a kind of raising coarse-grained soil ground, step includes: the construction parameter of live strong rammer clear first: tamping energy, tamping point spacing, ramming times and the hammer ram radius of every hammer；Then the dimensionless parameter that can reflect influence of the construction parameter to soil stabilization is obtained；Then the simplified model of soil stabilization in quick, convenient evaluation dynamic consolidation construction is established；Then consider crater depth and effective reinforcement depth, calculate soil body densification degree between adjacent tamping point with the variation of depth, soil body densification degree between the adjacent tamping point of ultimate analysis, the Construction Arrangement of reasonable arrangement strong rammer.The present invention is by soil body densification degree between the adjacent tamping point of analysis, and to optimize dynamic consolidation construction effect, engineering construction is convenient.
Description
Technical field
The present invention relates to field of civil engineering, and in particular, to the soil body between adjacent tamping point in a kind of raising coarse-grained soil ground
The method of forced ramming reinforcing effect.
Background technique
Heavy-tamping method is widely used in the poor foundation soil body of soil property and reinforces, with easy for construction, the significantly equal spies of cost advantage
Point.At this stage, strong punning design still mainly estimates construction parameter according to the experience of engineer or empirical equation, and passes through scene examination
Rammer is determined.Empirical equation is usually the single tamping point situation established according to case history, model test or numerical result
Lower Range of Dynamic Compaction size (being generally made of crater depth, effective reinforcement depth and lateral reinforcing scope) and different constructions
The quantitative relationship of parameter (every hammer tamping energy or ramming momentum, hammer ram size, ramming times) can be construction parameter in strong punning design
Selection convenience is provided, but dynamic consolidation construction all requires soil body level of encryption in reinforcing scope size and reinforcing scope, because
This only will lead to by empirical equation relevant to reinforcing scope size without the level of encryption of the soil body in consideration reinforcing scope
There are large errors for the construction parameter of estimation, so that reducing examination rams efficiency, cause the waste of construction cost.Further, since practical
Dynamic consolidation construction scene is made of a series of tamping points, also needed before dynamic consolidation construction to more tamping point relevant parameters such as tamping point spacing into
Row determines, simultaneously because there is superposition area between adjacent tamping point, while being influenced by periphery tamping point, need to consider adjacent tamping point it
Between interaction.
Find by prior art documents, Gao Guangyun in 2004 delivered in " underground space " " strong rammer it is non-
In a linear finite analysis and construction parameter optimization " text, using the analysis method of nonlinear finite element, single rammer situation is proposed
Under, the influence of different hammer ram base areas and falling distance of rammer to soil stabilization, and give the Optimizing Suggestions of construction parameter.
Zheng Hongjuan in 2010 delivered in " Chongqing Jiaotong University's journal " (natural science edition) " method for numerical simulation determines that saturated soil is strong
In a rammer construction parameter " text, using the method for numerical simulation, influence of the ramming times to soil stabilization is inquired into, and mention
Best ramming times are gone out.
But the eventful evaluation that lower soil stabilization is acted on for single rammer of document above, and the factor considered is less,
In Practical Project, mostly with the appearance of more rammers, and the factor for influencing soil stabilization is numerous, therefore proposes a kind of multifactor
Under the influence of, the method for improving soil body forced ramming reinforcing effect between adjacent tamping point in coarse-grained soil ground is particularly important, is construction parameter
Optimization provides foundation.
Summary of the invention
The object of the present invention is to when handling coarse-grained soil ground, provide in a kind of raising coarse-grained soil ground between adjacent tamping point
The method of soil body forced ramming reinforcing effect, have many advantages, such as it is simple, efficient, especially choose foundation dynamic consolidation construction parameter, have
Extensive engineer application and practicability.
In order to achieve the above object, the present invention is provided in a kind of raising coarse-grained soil ground, soil body forced ramming reinforcing is imitated between adjacent tamping point
The method of fruit, which comprises
S1: the construction parameter at scene, including every hammer tamping energy E are obtained firstt, tamping point interval Sd, ramming times n and hammer ram
Radius Rh；
S2: according to the construction parameter of acquisition, dimensionless parameter φ is determined1、φ2, the dimensionless parameter φ1、φ2It can be anti-
Reflect every hammer tamping energy Et, hammer ram radius Rh, tamping point interval SdAnd influence of the ramming times n to soil stabilization；
S3: the parameter based on S1 establishes the simplified model for quickly, advantageously evaluating soil stabilization in dynamic consolidation construction；
S4: the simplified model of result and S3 based on S2, while considering crater depth and effective reinforcement depth, it determines adjacent
Soil body densification degree and its situation of change with depth between tamping point；
S5: according to S4's as a result, analyzing the densification degree of the soil body at weak spot between adjacent tamping point, the basis before dynamic consolidation construction
Construction requirement Optimizing construction parameter, to instruct soil body forced ramming reinforcing tamping point adjacent in coarse-grained soil ground.
The present invention above S1, S2, S3 according to the sequence it is not necessary to execute, but for the convenience of description, practical basis
Project situation S1, S2, S3 sequence is adjustable.
Preferably, in S1, the approach that the construction parameter obtains is the record of construction equipment data and site operation.
Preferably, in S1, every hammer tamping energy EtMeet:
Et=Mh
In above formula: M be hammer ram quality, h be hammer ram fall away from.
Preferably, in S2, dimensionless parameter φ is used1、φ2Reflect every hammer tamping energy Et, hammer ram radius Rh, tamping point interval Sd
And influence of the ramming times n to soil stabilization, it is specific as follows:
In above formula: α is and every hammer tamping energy Et, hammer ram radius Rh, tamping point interval SdAnd ramming times n is related immeasurable
Guiding principle parameter, takes 1.8, wherein every hammer tamping energy Et=Mh, M be hammer ram quality, h be hammer ram fall away from；Atmospheric pressure Pa is
Constant, for constructing dimensionless parameter.
Preferably, in S3, the evaluation soil stabilization refers to: in practical dynamic consolidation construction, existing between adjacent tamping point
It is superimposed area, while being influenced by tamping point is closed on, superposition offset closes on tamping point certain distance, causes the region soil stabilization weak
In tamping point bottom soil body, wherein the middle point of adjacent tamping point is the weak spot of soil stabilization, reinforcement degree of soil body is wanted at this
Less than other positions, using the middle point of adjacent tamping point as the qualifying point of assessment forced ramming reinforcing effect.
It is highly preferred that the soil stabilization refers to: using relative compaction incremental raio DreReflect the reinforcing effect of the soil body
Fruit, specifically:
φ=28 °+15Dr
In above formula: φ is internal friction angle, DrFor relative compaction, emaxAnd eminRespectively maximum, minimum void ratio, e are
The void ratio of the soil body, e after rammer0For initial void ratio,For plastotype body strain, Dr0For initial relative compaction, Δ DrmaxTo ram
Soil body relative compaction maximal increment afterwards.
It is highly preferred that the simplified model for establishing evaluation soil stabilization refers to: establishing rectangular coordinate system in S3,
Coordinate origin is the intersection point of adjacent tamping point medium line and ground surface, and ordinate is positive downwards, and horizontal axis indicates the densification degree of the soil body,
That is relative compaction incremental raio takes 5 characteristic point P along depth direction at weak spot between adjacent tamping point1、P2、P3、P4、P5；It is described
Along 5 characteristic point P of depth direction at weak spot between adjacent tamping point1、P2、P3、P4And P5Coordinate be respectively (Dre1, d1)、(Dre2,
d2)、(Dre3, d3)、(Dre4, d4) and (Dre5, d5)。
Preferably, in S4, the crater depth refers to, the tamping pit generated behind hammer ram hammering ground, tamping pit bottom is away from earth's surface
Distance d1, d1Specifically:
M be hammer ram quality, h be hammer ram fall away from.
Preferably, in S4, the effective reinforcement depth refers to that hammer ram hammering ground influences the closely knit of the soil body in a certain range
Degree, biggest impact range, that is, effective reinforcement depth d5, d5Specifically:
In above formula: n' is empirical coefficient related with soil property situation, in which: gravelly soil, sand take 0.39-0.6, silt,
Cohesive soil, collapsible loess take 0.35-0.5.
It is highly preferred that, according to the variation of soil body densification degree, being divided into three parts along depth direction at weak spot in S4:
Relaxation perturbing area, strong stabilization zone, weak stabilization zone, it is linearly related to depth to set every part soil body densification degree.
Preferably, in S5, the consolidation effect during strong rammer between adjacent tamping point at weak spot is analyzed, is wanted according to dynamic consolidation construction
Ask hammer ram energy level, hammer ram radius, tamping point spacing and the ramming times of Optimizing construction.
Compared with prior art, the present invention have it is following the utility model has the advantages that
The present invention can optimize dynamic consolidation construction effect by soil body densification degree between the adjacent tamping point of analysis based on the analysis results
Fruit, the Construction Arrangement of reasonable arrangement strong rammer, engineering construction are convenient.
The present invention has many advantages, such as simply, efficient, is especially choosing foundation dynamic consolidation construction parameter, is having extensive engineering
Using and practicability.
Detailed description of the invention
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, other features of the invention,
Objects and advantages will become more significant:
Fig. 1 is the method flow diagram of one embodiment of the present invention；
Fig. 2 is the strong rammer simplified model figure of one embodiment of the present invention.
Specific embodiment
The present invention is described in detail below.Following instance will be helpful to those skilled in the art and further understand this
Invention, but the invention is not limited in any way.It should be pointed out that those skilled in the art, not taking off
Under the premise of from present inventive concept, various modifications and improvements can be made.These are all within the scope of protection of the present invention.
As shown in Figure 1, a kind of reality for improving the method for soil body forced ramming reinforcing effect between adjacent tamping point in coarse-grained soil ground
Apply a flow chart, comprising the following steps:
S1: the construction parameter at scene is obtained first, comprising: every hammer tamping energy Et, ram interval Sd, ramming times n and hammer ram
Radius Rh
The construction parameter acquiring way is the record of equipment data and site operation, in which: every hammer tamping energy EtMeter
Calculate formula are as follows:
Et=Mh
In formula: M be hammer ram quality, h be hammer ram fall away from.
S2: the dimensionless parameter φ that can reflect influence of the construction parameter to soil stabilization is then calculated1、φ2:
Use dimensionless parameter φ1、φ2Reflect every hammer tamping energy Et, hammer ram radius Rh, tamping point interval SdAnd ramming times
Influence of the n to soil stabilization, specific as follows:
In formula: α is and every hammer tamping energy Et, hammer ram radius Rh, tamping point interval SdAnd the related dimensionless of ramming times n
Parameter, α take 1.8, wherein every hammer tamping energy Et=Mh, M be hammer ram quality, h be hammer ram fall away from；Atmospheric pressure Pa is normal
Amount, for constructing dimensionless parameter.
S3: the simplified model for quickly, advantageously evaluating the consolidation effect of the soil body in dynamic consolidation construction is established；
Using relative compaction incremental raio DreReflect the consolidation effect of the soil body, expression are as follows:
φ=28 °+15Dr
In formula: φ is internal friction angle, emaxAnd eminRespectively maximum, minimum void ratio, DrFor relative compaction, e is to ram
The void ratio of the soil body afterwards, e0For initial void ratio,For plastotype body strain, Dr0For initial relative compaction, Δ DrmaxAfter ramming
Soil body relative compaction maximal increment.
As shown in Fig. 2, there is superposition area in practical dynamic consolidation construction, between adjacent tamping point, while being influenced by tamping point is closed on,
Since superposition offset closes on tamping point certain distance, the region soil stabilization is caused to be weaker than tamping point bottom soil body, wherein adjacent
The middle point of tamping point is the weak spot of soil stabilization, and the reinforcement degree of the soil body is less than other positions, therefore can be as
The consolidation effect of the soil body is estimated before assessment dynamic consolidation construction.
Rectangular coordinate system is established, coordinate origin is the intersection point of adjacent tamping point medium line and ground surface, and ordinate is positive downwards,
Horizontal axis indicates the densification degree of the soil body, i.e. relative compaction incremental raio, takes 5 characteristic point (P along depth direction at weak spot1,
P2, P3, P4, P5), the coordinate of characteristic point is respectively (Dre1, d1)、(Dre2,d2)、(Dre3,d3)、(Dre4,d4) and (Dre5, d5)。
S4: then consider crater depth and effective reinforcement depth simultaneously, soil body densification degree is with depth between calculating adjacent tamping point
The variation of degree
In S4, the crater depth refers to the tamping pit generated behind hammer ram hammering ground, distance d of the tamping pit bottom away from earth's surface1:
In S4, the effective reinforcement depth refers to that hammer ram hammering ground influences the compaction rate of the soil body in a certain range, most
Big coverage, that is, effective reinforcement depth d5, embody are as follows:
In formula: n ' is empirical coefficient related with soil property situation, and general gravelly soil, sand take 0.39-0.6, silt, viscosity
Soil, collapsible loess take 0.35-0.5.
As shown in Fig. 2, soil body densification degree with depth change curve is divided into three parts at the weak spot: relaxation disturbs
Area, strong stabilization zone, weak stabilization zone, and assume that every part soil body densification degree and depth are in a linear relationship.
Considering crater depth and on the basis of effective reinforcement depth, using relatively closely knit at strong rammer soil stabilization weak spot
Degree degree increment assesses the consolidation effect of the soil body, curve equation with the change curve of depth are as follows:
If d2The relative compaction incremental raio of the depth soil body is too small or crater depth levels off to 0.2d5, then curve is public
Formula are as follows:
In formula: d2、d3And d4Expression be respectively as follows:
d3=0.4d5
S5: between the adjacent tamping point of ultimate analysis at weak spot the soil body densification degree, based on the analysis results, in dynamic consolidation construction root
According to construction requirement Optimizing construction parameter, to instruct soil body forced ramming reinforcing tamping point adjacent in coarse-grained soil ground.
It is analyzed according to soil body densification degree between the adjacent tamping point of foundation along the simplification curve of depth distribution, discovery can not
When meeting field construction requirement, adjustable construction parameter is to reach construction requirement, or further increases phase in coarse-grained soil ground
Soil body forced ramming reinforcing effect between adjacent tamping point；It can also be reduced under the premise of meeting construction requirement by the adjustment of construction parameter
Construction cost.
The present invention is by soil body densification degree between the adjacent tamping point of analysis, and to optimize dynamic consolidation construction effect, engineering construction is convenient,
Application prospect is extensive.
Specific embodiments of the present invention are described above.It is to be appreciated that the invention is not limited to above-mentioned
Particular implementation, those skilled in the art can make various deformations or amendments within the scope of the claims, this not shadow
Ring substantive content of the invention.
Claims (5)
1. a kind of method for improving soil body forced ramming reinforcing effect between adjacent tamping point in coarse-grained soil ground characterized by comprising
S1: the construction parameter at scene, including every hammer tamping energy E are obtained firstt, tamping point interval Sd, ramming times n and hammer ram radius
Rh；
S2: according to the construction parameter of acquisition, dimensionless parameter φ is determined1、φ2, the dimensionless parameter φ1、φ2It can reflect every hammer
Tamping energy Et, hammer ram radius Rh, tamping point interval SdAnd influence of the ramming times n to soil stabilization；
S3: the parameter based on S1 establishes the simplified model for quickly, advantageously evaluating soil stabilization in dynamic consolidation construction；
S4: the simplified model of result and S3 based on S2, while considering crater depth and effective reinforcement depth, determine adjacent tamping point
Between soil body densification degree and its situation of change with depth；
S5: according to S4's as a result, the densification degree of the soil body at weak spot between adjacent tamping point is analyzed, according to construction before dynamic consolidation construction
It is required that Optimizing construction parameter, to instruct soil body forced ramming reinforcing tamping point adjacent in coarse-grained soil ground；
In S3, the evaluation soil stabilization refers to: there is superposition area in practical dynamic consolidation construction, between adjacent tamping point, simultaneously
It is influenced by tamping point is closed on, superposition offset closes on tamping point certain distance, and the region soil stabilization is caused to be weaker than tamping point bottom
The soil body, wherein the middle point of adjacent tamping point is the weak spot of soil stabilization, reinforcement degree of soil body is less than other positions at this
It sets, using the middle point of adjacent tamping point as the qualifying point of assessment forced ramming reinforcing effect；
The soil stabilization, refers to: using relative compaction incremental raio DreReflect the consolidation effect of the soil body, specifically:
φ=28 °+15Dr
In above formula: φ is internal friction angle, DrFor relative compaction, emaxAnd eminRespectively maximum, minimum void ratio, e are soil after ramming
The void ratio of body, e0For initial void ratio,For plastotype body strain, Dr0For initial relative compaction, Δ DrmaxFor the soil body after rammer
Relative compaction maximal increment；
In S3, the simplified model for establishing evaluation soil stabilization refers to: establishing rectangular coordinate system, coordinate origin is phase
The intersection point of adjacent tamping point medium line and ground surface, ordinate are positive downwards, and horizontal axis indicates the densification degree of the soil body, i.e. relative compaction
Incremental raio takes 5 characteristic point P along depth direction at weak spot between adjacent tamping point1、P2、P3、P4、P5；It is thin between the adjacent tamping point
Along 5 characteristic point P of depth direction at weakness1、P2、P3、P4And P5Coordinate be respectively (Dre1, d1)、(Dre2, d2)、(Dre3, d3)、
(Dre4, d4) and (Dre5, d5)；
In S4, the crater depth refers to, the tamping pit generated behind hammer ram hammering ground, distance d of the tamping pit bottom away from earth's surface1, d1Tool
Body are as follows:
M be hammer ram quality, h be hammer ram fall away from；
In S4, the effective reinforcement depth refers to that hammer ram hammering ground influences the compaction rate of the soil body in a certain range, maximum shadow
Ring range, that is, effective reinforcement depth d5, d5Specifically:
In above formula: n' is empirical coefficient related with soil property situation, in which: gravelly soil, sand take 0.39-0.6, silt, viscosity
Soil, collapsible loess take 0.35-0.5.
2. the method according to claim 1 for improving soil body forced ramming reinforcing effect between adjacent tamping point in coarse-grained soil ground,
It is characterized in that, in S1, every hammer tamping energy EtMeet:
Et=Mh,
In above formula: M be hammer ram quality, h be hammer ram fall away from.
3. the method according to claim 1 for improving soil body forced ramming reinforcing effect between adjacent tamping point in coarse-grained soil ground,
It is characterized in that, in S2, uses dimensionless parameter φ1、φ2Reflect every hammer tamping energy Et, hammer ram radius Rh, tamping point interval SdAnd it rams
Influence of the frequency n to soil stabilization is hit, specific as follows:
In above formula: α is and every hammer tamping energy Et, hammer ram radius Rh, tamping point interval SdAnd the related dimensionless ginseng of ramming times n
Number, takes 1.8, wherein every hammer tamping energy Et=Mh, M be hammer ram quality, h be hammer ram fall away from；Atmospheric pressure Pa is constant,
For constructing dimensionless parameter.
4. the method according to claim 1 for improving soil body forced ramming reinforcing effect between adjacent tamping point in coarse-grained soil ground,
It is characterized in that, in S4, according to the variation of soil body densification degree, is divided into three parts along depth direction at weak spot: relaxation disturbance
It is linearly related to depth to set every part soil body densification degree for area, strong stabilization zone, weak stabilization zone.
5. soil body forced ramming reinforcing effect between adjacent tamping point in raising coarse-grained soil ground according to claim 1-4
Method, which is characterized in that in S5, the consolidation effect during strong rammer between adjacent tamping point at weak spot is analyzed, according to dynamic consolidation construction
It is required that the hammer ram energy level of Optimizing construction, hammer ram radius, tamping point spacing and ramming times.
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