CN101519870A - Construction method for treating soft groundwork surface layer by using bamboo web - Google Patents
Construction method for treating soft groundwork surface layer by using bamboo web Download PDFInfo
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- CN101519870A CN101519870A CN200810167265A CN200810167265A CN101519870A CN 101519870 A CN101519870 A CN 101519870A CN 200810167265 A CN200810167265 A CN 200810167265A CN 200810167265 A CN200810167265 A CN 200810167265A CN 101519870 A CN101519870 A CN 101519870A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/10—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D1/00—Investigation of foundation soil in situ
- E02D1/02—Investigation of foundation soil in situ before construction work
- E02D1/022—Investigation of foundation soil in situ before construction work by investigating mechanical properties of the soil
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2200/00—Geometrical or physical properties
- E02D2200/13—Geometrical or physical properties having at least a mesh portion
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Abstract
The invention provides a construction method for treating soft groundwork surface layer by using bamboo web. Bearing forces of different soil cover thickness are elevated by a flat-plate loading test, and interrelation of allowed bearing forces is educed according to construction equipment, reinforcing material and soil cover thickness, by analyzing allowed bearing forces by using theoretical formula, applicability of the theoretical formula in existence and efficiency factor of the bamboo web construction method are analyzed, which are used as base data of economic and safe surface layer treating construction method. The method comprises steps of: designing the bamboo web based on design scheme of the invention; arranging the bamboo web on soft groundwork based on soil cover thickness of the bamboo web designed with proper interspace according to the design scheme, building in border piles on at least a corner of the bamboo web; paving construction fibre for separation on the bamboo web; paving soil sand on the construction fibre for separation to form cover soil layer; paving sand on the cover soil layer to form sand soil layer; carrying out flat-plate loading test on the soft groundwork to affirm bearing force of the groundwork.
Description
Technical field
The present invention relates to a kind of bamboo net that utilizes and handle worker's method on soft foundation top layer, particularly in the surface layer science and engineering method of utilizing the bamboo net, to using motion mode and rule of thumb design in the existing mountain, the bamboo net that is provided with, bearing capacity when estimating different thickness of earth covering by the large flat load test at scene, and press construction equipment respectively, reinforcement material, thickness of earth covering is derived the correlation that allows bearing capacity, by the permission bearing capacity that has utilized theoretical formula in the known mountain is analyzed, analyze the efficiency of the applicability and the bamboo net worker method of existing theoretical formula, utilize as the basic material of not only economy but also stable surface layer science and engineering method.
Background technology
Recently, in order to ensure large-scale new bay, new airport, new city, industry group ground and agricultural land, landfill seashore and take the industry group ground in seashore area and road construction is active is carrying out.But different with the construction of the landfill in past, because of environmental issue and economic cause are difficult to guarantee that land landfill with soil, generally utilizes dredging soil at present.
But, the ground that uses dredging landfill soil and the native slag of dredging to form, even only place more than 10 years its top layer behind the landfill according to natural conditions and hardening in dredging, can carry out the simple discrepancy of personnel, but its top layer is not handled in addition, and the equipment that foundation improvement is carried out in very difficult guarantee enters.
Generally speaking, the improvement of carrying out ground in 1～2 year is afterwards placed at such scene, so very unfavorable to engineering time and application property.
Therefore, in order to address these problems, the bulldozer that has proposed to utilize wetland to use after the building fiber is laid on the top layer is laid soil and sand or is utilized the tyre type conveyer or high pressure is spread the method for spilling sand, make the method for the high sclerosis in whole top layer, multiple surface layer science and engineering methods such as horizontal vacuum compacting worker method.
But, when thickness of earth covering is inhomogeneous, being subjected to excessive tension stress and the big pressure that makes progress, dredging landfill soil moment that liquid condition can take place is flowed out ground surface or security incident such as equipment collapses, buried.
At this, building fiber (Geotextile) worker method in the above-mentioned surface layer science and engineering method is, the tension force of the building fiber that performance is laid on soft foundation self suppresses the excessive deformation of ground, and strengthen the bearing capacity of ground and guarantee the handling capacity (Trafficability) of equipment, use the building fiber to come consolidated subsoil for this reason.
Above-mentioned building fiber worker method is, after the artificial laying building fiber, uses mini-plant to lay the native sand of high-quality by stages in the above on through the dredging landfill soil after the air dry in 1～2 year, and reseting fully that the improvement ground uses passed through.This worker's method is the most widely used worker's method in the surface layer science and engineering method, has abundant construction experience and achievement.
About above-mentioned building fiber worker method, because of almost not having bending strength in the building fibrous material characteristic, the VISCOUS FLOW that can't suppress soft foundation during mound, and vertical change takes place with the motion of ground surface interlock, be difficult to guarantee the handling capacity and the stability of equipment.
Therefore, the friction of building fiber and ground sharply descends, delays manifesting of required tensile strength, and the local mound material phenomenon of sinking to caving in takes place.
In addition, even if lay earthing equably, when carrying out the construction of vertical drainage material,, might the sinking of generation equipment etc. hinder the situation of safe construction because of tomography takes place for the difference of the working stress between the works area between the works area and not.
It is dispersing apparatus negative load equably that main purpose with earthing is handled on the top layer, only lay the analytic theory that just can meet the ground engineering with same thickness, but the earthing laying method of the bulldozer that uses when generally constructing also exists the possibility of sinking takes place when constructing with the adjacency section of existing ground.
In addition, when providing and lay cover soil material, because of the motion repeatedly of relevant device makes bottom ground accumulated fatigue stress, thereby VISCOUS FLOW can significantly appear in the travel direction to mound, not only make the bottom ground disorderly fully, it is very thick that its thickness of earth covering also becomes, and causes earthing to lay uneven reason.
Bamboo in above-mentioned surface layer science and engineering method net worker method is, the mechanics that utilize the bending strength of bamboo big, tension and torsional property is strong, when the characteristics on the material improve soft foundation, suppresses local failure and irregular worker's method of caving in.Improved the problem that exists in the surface layer science and engineering method of before dredging landfill foundation improvement such as dredging Tu Zhachang etc., constructing, utilize existing building fiber to carry out, be not only economy, but also can guarantee worker's method of construction stability.
Promptly, in above-mentioned building fiber worker method, utilizing a few Zhang Tumu fibers that the soil of broad is reinforced is the suitable thing of difficulty.
Bamboo is also bought easily in a large amount of cultivations of Korea S or spontaneous, and is also very good as its material behavior of constructional materials.
In order more effectively to realize the original purpose of surface layer science and engineering method, bamboo net worker method has following feature.
1. improve the quality parameter of foundation improvement.
Worker's method with the existing building fiber of independent application is compared, and the construction of bamboo net can make the VISCOUS FLOW of ground minimize, and stablizes the required thickness of earth covering of carrying equipment and becomes minimum thereby can make.
And laying bamboo net back personnel can directly enter, and can investigate the initial value of the in fact difficult dredging landfill ground that carries out in the past, can carry out execution control, the setting of deep layer improvement execution control a reference value and high-quality foundation improvement effectively.
In addition, can lay more equably than existing worker's method during earthing, form uniform horizontal drainage layer, reduce unnecessary earthing workshop section.The ground height before the foundation improvement and the foundation property at initial stage be can also measure, the reliability of measuring management and the quality of foundation improvement improved.
2. improve construction ability
Just can improve the hardness of skin section in early days, lateral flow is minimized, thereby can shorten the time of placing for dry tack free behind the dredging landfill.
In addition, the making of bamboo net is simple, and the earthing condition of construction that can detect by an unaided eye when laying, and carries out execution control easily, can prevent the phenomenon of earthing in a direction set, can evenly lay, and can make mobile the minimizing of soft layer.
3. improve economy
Made full use of the rigidity of bamboo, can make thickness of earth covering, can realize even laying, shortened construction speed about about 30% thereby improved speed of application than the attenuation of existing worker's method.
Reduce the laying depth of thickness of earth covering and sand, can guarantee to shorten the economy of construction period and construction simultaneously.
Design with surface layer science and engineering method above-mentioned advantage, that utilize bamboo net is, rule of thumb or utilize the formula calculating of (Yamanouchi) on the mountain in.
Mr. has found to lay on soft foundation after Geo net or the earthing in the mountain, in the load intensity and the relation between the deflection when carrying out load test in the earthing upper end, bending point occurs when a certain load intensity, has found that bearing capacity manifests once more.
Promptly, according to the bearing capacity theory of Prandtl (Prandtl) stream, the chock band under the expression load contacts after the net, forms the chock band of new shape by net.
Utilize this theory will net worker's method and be modeled to the upper strata, proposed the bearing capacity formula for earthing, lower floor two layers of ground for soft foundation.
In addition,, be about formula in the mountain of the bearing capacity theory of the surface layer science and engineering method of utilizing bamboo net with reference to Figure 13, considered the vertical drainage material installation by the time mat the bearing capacity model of consolidation effect, under the situation of object ground, can ignore S
a, r, D
fInfluence, the permission bearing capacity of its ground is expressed as follows.
Wherein, Fs: short term security rate (=2.0), d: thickness of earth covering, b: the ground connection width,
C: the undrained shear intensity (tf/m of former ground clay
2),
Tall: the permission tension force of reinforcement material, θ: the angle (=20 °) that reinforcement material and horizontal plane form
In above-mentioned mountain in the formula, θ and D
f, r is the coefficient relevant with the deformed shape of loaded-up condition, is the part that influences the calculation of bearing capacity result, still, D up to the present
f, r, the value of θ does not have clear and definite final conclusion in theory, and quantitative measurement result is also few, and what use in fact at present is guess value.
In addition, the value of the cases in foreign countries when the tension force application point of reinforcement material adopts the construction of building fiber, but when designing as tensile materials, be necessary that tension force is suitable for angle to be studied with the bamboo of rigid material.
At D
fR, the method of obtaining that influences the θ value of tension force size in the θ value has, and obtains from the graph of a relation of θ-c according to the investigation results of the deformed sections of Ban Jing strong (1990), perhaps causes that according to load-carrying the form of setting of ground utilizes the geometry method to obtain the method for θ value.
But according to the method that the sinking form of ground is obtained, existence is supposed the sinking form of ground and is approximately circle or straight line, so be difficult to the problem of the characteristic of reaction object ground.
Therefore, in order to estimate the bearing capacity of the above-mentioned ground of reinforcing by bamboo net, utilized the bearing capacity judgement schematics in the mountain.But,,, produced the necessity of revising and improving existing formula by studying so there is the difference on the mechanics because the building fiber is that tensile materials, opposite bamboo net are rigid material on the material self characteristics.
Summary of the invention
In order to solve aforesaid problem, the object of the invention is to provide a kind of bamboo net that utilizes to handle worker's method on soft foundation top layer, estimate the bearing capacity of different thickness of earth covering at the scene by the large flat load test, and, press construction equipment respectively, reinforcement material, thickness of earth covering is derived the correlation that allows bearing capacity, by having utilized the permission Analysis of Bearing Capacity of theoretical formula in the existing mountain, have the applicability of theoretical formula and the analysis that bamboo is netted the efficiency of worker's method now, and the not only design handled of economy but also stable top layer, and utilized the bamboo net that to apply flexibly as the basic material that is provided with.
In order to realize aforesaid purpose of the present invention, the bamboo net that utilizes that the present invention relates to is handled worker's method on soft foundation top layer, comprises the steps: based on the design scheme that proposes among the present invention the step of design bamboo net; Based on the bamboo net and the thickness of earth covering of the suitable spacing that designs according to above-mentioned design scheme, the step of bamboo net is set on the object soft foundation; Penetrate the step of skirt piles in a certain at least bight of above-mentioned bamboo net; Lay the step of separating on the net with the building fiber in above-mentioned bamboo; Lay native sand on the building fiber and form the step of overburden layer in above-mentioned separation; On above-mentioned overburden layer, lay sand and form the step of chiltern soil layer; On the soft foundation that is equipped with above-mentioned bamboo net, carry out plate, confirm the step of the bearing capacity of this soft foundation.
As described above, the bamboo net that utilizes that the present invention relates to is handled worker's method on soft foundation top layer, have on the very soft natural soft foundation of soil or on the artificial soft foundation as landfill, in order to ensure building with reseting passage that the safe passing that is equipped with uses when the top layer of soft foundation reinforced, can reduce required cost of materials, and improve and on soft foundation, build with the stability of reseting the designated lane that is equipped with.
Description of drawings
Fig. 1 is that the bamboo net that utilizes that expression the present invention relates to is handled the vertical view of the state on soft foundation top layer.
Fig. 2 is that the bamboo net that utilizes that expression the present invention relates to is handled the lateral view of the state on soft foundation top layer.
Fig. 3 is that the bamboo net that utilizes that expression the present invention relates to is handled the stereogram of the tubular bamboo skirt piles that use in worker's method on soft foundation top layer.
Fig. 4 is that the bamboo net that utilizes that expression the present invention relates to is handled the stereogram of the sheet bamboo skirt piles that use in worker's method on soft foundation top layer.
Fig. 5 is that the bamboo net that utilizes that expression the present invention relates to is handled the stereogram of the sand pile that uses in worker's method on soft foundation top layer.
Fig. 6 is illustrated in the bamboo net that utilizes that the present invention relates to handle the inner stereogram of filling the sand state of the sheet bamboo skirt piles that use in worker's method on soft foundation top layer.
Fig. 7 is illustrated in the bamboo net that utilizes that the present invention relates to handle the stereogram of the reed skirt piles that use in worker's method on soft foundation top layer.
Fig. 8 is the schematic diagram of the woven condition of the bamboo net that utilizes bamboo net to handle to use in worker's method on soft foundation top layer that the present invention relates to of expression.
Fig. 9 be expression the present invention relates to utilize bamboo net to handle to use in worker's method on soft foundation top layer, utilize the plate device to carry out the flow chart of load test process.
Figure 10 is the figure of relation between actual measurement bearing capacity in the plate that relatively the present invention relates to and equipment ground are pressed.
Figure 11 is the schematic diagram of the bearing capacity ratio under the different thickness of earth covering of representing to invent in the plate that relates to.
Figure 12 is the figure of relation between bearing capacity in the plate that relatively the present invention relates to and equipment ground are pressed.
Figure 13 is the schematic diagram that concerns between BCR in the plate that the present invention relates to of expression and the H/S.
Figure 14 is the schematic diagram of the earthing net loaded power model afterwards in the expression mountain.
The specific embodiment
Below, present invention will be described in detail with reference to the accompanying.
Fig. 1 is that the bamboo net that utilizes that expression the present invention relates to is handled the vertical view of the state on soft foundation top layer; Fig. 2 is that the bamboo net that utilizes that expression the present invention relates to is handled the lateral view of the state on soft foundation top layer; Fig. 3 is that the bamboo net that utilizes that expression the present invention relates to is handled the stereogram of the tubular bamboo skirt piles that use in worker's method on soft foundation top layer; Fig. 4 is that the bamboo net that utilizes that expression the present invention relates to is handled the stereogram of the sheet bamboo skirt piles that use in worker's method on soft foundation top layer; Fig. 5 is that the bamboo net that utilizes that expression the present invention relates to is handled the stereogram of the sand pile that uses in worker's method on soft foundation top layer; Fig. 6 is illustrated in the bamboo net that utilizes that the present invention relates to handle the inner stereogram of filling the sand state of the sheet bamboo skirt piles that use in worker's method on soft foundation top layer; Fig. 7 is illustrated in the bamboo net that utilizes that the present invention relates to handle the stereogram of the reed skirt piles that use in worker's method on soft foundation top layer; Fig. 8 is the schematic diagram of the woven condition of the bamboo net that utilizes bamboo net to handle to use in worker's method on soft foundation top layer that the present invention relates to of expression; Fig. 9 be expression the present invention relates to utilize bamboo net to handle to use in worker's method on soft foundation top layer, utilize the plate device to carry out the flow chart of load test process; Figure 10 is the figure of relation between actual measurement bearing capacity in the plate that relatively the present invention relates to and equipment ground are pressed; Figure 11 is the schematic diagram of the bearing capacity ratio under the different thickness of earth covering of representing to invent in the plate that relates to; Figure 12 is the figure of relation between bearing capacity in the plate that relatively the present invention relates to and equipment ground are pressed; Figure 13 is the schematic diagram that concerns between BCR in the plate that the present invention relates to of expression and the H/S.
As shown in these figures, the bamboo net that utilizes that the present invention relates to is handled worker's method on soft foundation top layer, comprises the steps: with the design scheme that the present invention proposes to be the step of basic engineering bamboo net B; Based on the bamboo net B and the thickness of earth covering of the suitable spacing that designs according to above-mentioned design scheme, the step of bamboo net B is set on object soft foundation G; Penetrate the step of skirt piles P in some at least bights of above-mentioned bamboo net B; The step of on above-mentioned bamboo net B, laying separatory building fiber F; On above-mentioned separatory building fiber F, lay native sand and form the step of overburden layer C; On above-mentioned overburden layer C, lay sand and form the step of chiltern soil layer S; On the soft foundation G that is equipped with above-mentioned bamboo net B, carry out plate, confirm the step of the bearing capacity of its soft foundation G.
That is, the worker's method of utilizing the bamboo net to handle the soft foundation top layer that the present invention relates to is that the design scheme that proposes according to the present invention designs and be provided with bamboo net B; Squeeze into skirt piles P; Lay separatory building fiber F; Form overburden layer C and chiltern soil layer S; Confirm bearing capacity based on plate in order, on soft foundation G, guarantee safety, guarantee the economy of reinforcement material and build early stage construction with the escape way of jumbo special use by building with when reseting the passage that is equipped with.
This is based on the stage of the design scheme design bamboo net B of the present invention's proposition.
Afterwards, according to the bamboo net B and the thickness of earth covering of the suitable spacing that designs according to above-mentioned design scheme, bamboo net B is set on object soft foundation G.As shown in Figure 1 and Figure 2, bamboo net B is set on object soft foundation G, some at least bights at above-mentioned bamboo net B penetrate skirt piles P, after on above-mentioned bamboo net B, laying separatory building fiber F, at the above-mentioned separation native sand formation of laying overburden layer C on the building fiber F, on above-mentioned overburden layer C, lay sand then and form chiltern soil layer S.
At this moment, the bamboo that is provided with on above-mentioned object soft foundation G net B comprises the skirt piles P that a bamboo 10 and the mesh by above-mentioned tube bamboo 10 penetrate.
Particularly, above-mentioned skirt piles P can be made of in tube bamboo 10, bamboo chip 12, reed 14, the sand pile 15 any, perhaps fills sand 19 at the inboard central portion of above-mentioned skirt piles P.Promptly, tie into a plurality of bamboos 10 usefulness steel wires 16 a branch of, what tube bamboo 10 was used certain-length as far as possible is good, because of the length of tube bamboo 10 does not coexist the lower end when the outstanding tube bamboo 10 of part occurring, top carrier power can go wrong, the sinkage that partly tilts appears when squeezing in the ground, when if the upper end is inconsistent, the phenomenon of local strength's decline of overburden layer C may appear.
In addition, above-mentioned skirt piles P can length is identical bamboo chip 10 tie into a branch of use, also can use multilayer bamboo chip 12 to tie into a branch of use the part of having filled sand 19, can also use the skirt piles P that makes by reed 14, fill the sand pile 15 or the tube bamboo 10 of sand in, the sack 14 that mix, perhaps between the material of the skirt piles P of reed 14, filled structure of sand 19 or the like with bamboo and reed.
The theoretical foundation of such skirt piles P is the Ba Lunli opinion (Barron ' s theory) about the densification state.Discuss according to Ba Lunli, when using vertical row water conservancy project method, densification square being directly proportional of the effective diameter that influence source of required time when following of sinking as the adrainage material injection, so compare as diameter and the increasing injection spacing of the skirt piles P of adrainage material with increase, the structure that reduces diameter and closely injection more meets this theory.
Therefore, the skirt piles P that the present invention relates to has fully reacted above-mentioned main points, be fit to use need not to build with reseting the help that is equipped with and only depend on the just abundant bamboo 10 used of the skirt piles P of injection of manpower, a thicker bamboo 10 can be made with bamboo chip 12, and reed 14 can directly be used.
Particularly tube bamboo 10 has resistant to bending stresses and the very strong advantage of tensile strength, and low weight because of its abdomen hollow, is a kind of easy-to-use nature material therefore, all belongs to environment-friendly materials with bamboo chip 12 and reed 14.
No matter above-mentioned its material shape of skirt piles P is how, because of gap between its material more, if injection after the soft ground, have with soft foundation G around it to around compressing the time, make underground water flow into this place, and to the function of top draining.
Like this, by the drainage of skirt piles P, the moisture content of soft foundation G sharply descends, and can reach the effect of strengthening the top layer ground in early days.
Below, explanation uses the tube bamboo 10 of skirt piles P and vertical, horizontal to be used to guarantee that construction on the soft foundation G is with the reinforcing operation of reseting the designated lane that is equipped with in order.
At first, one zhang long tube bamboo 10 is arranged with clathrate by vertical, horizontal, use steel wire 16 that its crosspoint is bundled firmly and weave into bamboo net B.
At this, thick more its bending strength of tube bamboo 10 that vertical, horizontal is used is big more, though help using, is fit to use the bamboo of diameter 3～7cm during manual work.
The bamboo net B that weaves into like this, compile effect according to elastic force of tube bamboo 10 self and the net in steel concrete as reinforcing bar, having the construction usefulness that is dispersed in its top lift-launch resets fully and the effect of the load of overburden layer C and chiltern soil layer S, simultaneously, firm support and its concavo-convex phenomenon is minimized is for guaranteeing passage and also having important function in thereafter construction with reseting the utilization that is equipped with.And, compare with building fiber F structure in the past, can make the even attenuation of thickness of earth covering, help improving quality and reduce construction cost.The mesh of above-mentioned bamboo net B can be adjusted with reseting the execution conditions that are equipped with etc. according to the construction of mud state and use.
Afterwards, in the place that above-mentioned bamboo net B is set, skirt piles P is squeezed in the some at least bights in the mesh of each bamboo net B.
At this, above-mentioned skirt piles P can be with aforesaid because of containing the telluric water that a large amount of underground water make the top layer that personnel are difficult to come in and go out, promptly, interstitial water is discharged the face of land in early days by the densification effect, firm tissue is improved on the top layer of soft foundation G, the VISCOUS FLOW of the earth that occurs easily when only laying bamboo net B is minimized, can drop into the manpower and the light-type equipment of the section thickness that is formed uniformly overburden layer C in early days.
This drainer ratio juris of extensively utilizing during with general foundation improvement is identical.
In addition, the top layer of soft foundation G is moisture high state, and the continuous cropping industry personnel also be difficult to enter.
To this soft foundation G, at first lay bamboo net B, be that the foot rest injection meets the skirt piles P that the material of field condition is made with it.
The ground that can come in and go out for personnel, can with skirt piles P after lattice spacing is neatly squeezed into, lay bamboo net B again.
As mentioned above, on bamboo net B, squeeze into skirt piles P and after forming ground, on above-mentioned bamboo net B, lay separatory building fiber F.
At this moment, separating with building fiber F is that soil and mixes with mud from lattice space (mesh) outflow of bamboo net B when effectively preventing earthing.
In this case, net B with building fiber F by bamboo and supporting, can use the less building fiber F of building fiber F intensity than in the past because of separating.
Afterwards, above-mentioned separation with building fiber F above formation overburden layer C, laying sand 19 on above-mentioned overburden layer C and form chiltern soil layer S then can guarantee to make required construction to be equipped with current road with reseting.
Secondly, the above-mentioned soft foundation G that has laid bamboo net B is being carried out plate, in the process of the bearing capacity of affirmation soft foundation G, under the state of laying bamboo net B on the soft foundation G, the soft foundation G that has laid is carried out plate, confirm the bearing capacity of soft foundation G.
At this, the bearing capacity calculation of above-mentioned soft foundation G comprises the steps: to select the step of load plate kind; The step in the place of the object soft foundation G of calculating plate; Prepare the step of plate equipment; The step of the physical property of determination object soft foundation G; Undermine until the step of object soft foundation G face; Step with plane of load location (level and vertical); The step of load plate is set; The step of assembling load device; The step of assembling displacement measurement apparatus; Loading pilot study load, the step of mensuration deflection; Adjust the step at the zero point of load measurement device; Adjust the step at the zero point of displacement measurement apparatus; Interim ground load test load, the step of mensuration deflection at this moment; Carry out load and the mensuration of sinking, until the step of ultimate limit state, anti-load condition or maximum load interimly; Put and analyze the step of above-mentioned measured value in order.
And, in above-mentioned analytic process, by the correlation that the undrained shear intensity Cu that estimates ground in all cases, the bearing capacity ratio BCR that obtains when bamboo net B is carried out load test and the bamboo under the various condition are netted the rigidity of B, utilize optimal regression analysis formula to calculate bearing capacity.In addition, above-mentioned bearing capacity ratio BCR=4.4909 (H/S)
0.6153
Aforesaid plate result, usually allowing bearing capacity is comprehensively to judge loading condiction and foundation condition etc. by the designer, calculate bearing capacity according to static bearing capacity computation method, perhaps when calculating the permission bearing capacity by the load test result, big body and function limit load is obtained divided by safety coefficient.
Moreover, according to field condition, allow bearing capacity from anti-load intensity/2 or limit load intensity/3, to adopt smaller value for a long time, short-term allows bearing capacity to adopt anti-load intensity.
As above explanation allows bearing capacity to be made as 2 times method of long-term permission bearing capacity short-term, is the most general method.
In the surface layer science and engineering method that the present invention relates to, if when considering field condition, should not be notion with the long-term permission bearing capacity of structure base etc., but should be that the short-term bearing capacity of purpose is that notion is more reasonable with the service ability of guaranteeing to be used to utilize the equipment of foundation improvement worker method.
Therefore, when calculating allowable bearing capacity of foundation soil among the present invention, used the permission bearing capacity of short-term notion.In addition, the present invention is under the identical hypothesis of former ground condition, the performance difference that the separation of using as the material of surface layer science and engineering method is netted with building fiber and bamboo compares, after having guaranteed former allowable bearing capacity of foundation soil, add the bearing capacity that reinforcement material produces, the value that allows bearing capacity is carried out normalization.
Therefore, the permission bearing capacity that calculates in the large flat load test of carrying out at the scene is the value that short-term allows bearing capacity, and the permission bearing capacity that uses when of the present invention the evaluation then is to have carried out normalized permission bearing capacity.
The equipment ground of using among the present invention is pressed and allowed bearing capacity all is to compare the value of 0.4～1.95m that thickness of earth covering has been measured to when having used actual tests to act as benchmark on former ground.
In addition, the permission bearing capacity that calculates when using bamboo net B is 1.4～1.6 times that equipment ground is pressed, and thinks and satisfies the bearing capacity condition.
Particularly, the purpose of plate of the present invention is the bearing capacity that uses bamboo to net the ground of reinforcing in order to estimate, and by carry out the model testing in earthing stage at the scene respectively by appointed condition, comes calculation relational expression, and its meaning is very big.
In addition, as shown in figure 11, in consolidation effect of the present invention is analyzed, in order to understand the consolidation effect of different reinforcement materials to the permission bearing capacity generation of ground, following calculating bearing capacity ratio.
Promptly, bearing capacity ratio be theory before reinforcing allow bearing capacity and reinforce after actual measurement allow the ratio of bearing capacity, the ratio of bearing capacity is big more, illustrates that the consolidation effect of reinforcement material is better.
BCR＝q
a/q
o
At this, BCR: bearing capacity ratio (Bearing Capacity Ratio)
Qa: the permission bearing capacity of obtaining by the large flat load test
Qo: the theory before reinforcing allows bearing capacity
Table 1:
Calculate the result of the bearing capacity ratio of various reinforcement materials, BCR=2.92～7.72 of bamboo net, consolidation effect is bigger, BCR=2.78～4.73 of building fiber (15tf/m), consolidation effect is less.
Therefore, calculate the result who allows bearing capacities by various earthing stages respectively, the permission bearing capacity ratio in the zone that is reinforced by the bamboo net is only used fiber reinforced regional big 1.5 times of building.
Below, with reference to Figure 12, formula in permission calculation of bearing capacity result of the present invention and the mountain is compared explanation.
In order to carry out the comparative analysis of the same terms,, figure as follows with value and the application apparatus earth contact pressure that the size of the measured value of large flat and load plate calculates as load effect width based on formula in the mountain.
As shown in the figure, allow the size of bearing capacity to diminish according to the measured value of large flat load test, the order that the equipment ground of application apparatus is pressed, because of measured value is pressed greater than required equipment ground, therefore think and to use, but when handled on design bamboo net top layer, formula calculated in the mountain if only use, problem in the execution control may be taken place by exaggerative in its size that allows bearing capacity.
The result who measured result is compared by bearing capacity judgement schematics in the existing mountain when using rigid material as bamboo as reinforcement material, can find that the application of bearing capacity judgement schematics in the existing mountain is relatively poor.
This be because, the such reinforcement material of building fiber is to belong to bring into play the tensile materials that maximum, force (tension force) is brought into play its consolidation effect when certain distortion taken place, on the contrary, reinforcement material as bamboo net does not belong to tensile materials but strengthens the rigid material of bearing capacity of foundation soil with rigidity, different with the building fiber of stretching resistance, except that stretching resistance, can also expect the caused consolidation effect of rigidity effect.
Therefore, it is as follows that the present invention has set the judgement schematics of bearing capacity of the material behavior of having considered bamboo when importing the bamboo net.
BCR＝4.4909(H/S)
0.6153
Wherein, H/S: the ratio of earthing height and bamboo spacing
H: earthing height (m)
S: bamboo spacing (m)
BCR＝q
a/q
o
BCR: bearing capacity ratio
Qa: the permission bearing capacity of consolidated subsoil
Qo: the permission bearing capacity qo=c of unguyed ground
uN
c/ F
s
As described above, in the calculation of bearing capacity of the soft foundation that utilizes the bamboo net that the present invention relates to, estimate the bearing capacity of different thickness of earth covering at the scene by the large flat load test, and utilize formula comparative analysis permission bearing capacity in the existing mountain, its result draws as drawing a conclusion.
The permission bearing capacity of the different reinforcement materials that draw in the load test at the scene is less than the measurement result of the predicted value that obtains according to formula in the existing mountain.
In addition, as shown in figure 13, respectively to the bearing capacity ratio result calculated of each reinforcement material, the consolidation effect of bamboo net is bigger by the large flat load test, building fiber (15tf/m) less, and the bearing capacity consolidation effect of bamboo net is than 1.5 times of building fibers.
Utilize the result of theoretical formula to the permission bearing capacity calculation of each thickness of earth covering, when using θ value, compare for 20 ° with the value of general application in the past, when using 7 ° more near the field measurement value, thereby it is in the time of can judging the θ value of using theoretical formula in the existing mountain, more or less exaggerative.
As mentioned above, the bamboo net that utilizes that the present invention relates to is handled worker's method on soft foundation top layer, utilizing the external force good rigidity of the length direction effect of soft foundation G and corrosion-resistant, directly being placed in the ground also not can contaminated soil and phreatic tube bamboo 10, in bamboo chip 12 or the reed 14 at least by a kind of or two kinds of skirt piles P that constitute be bundled on the soft foundation G in length and breadth the crosspoint of the tube bamboo 10 of arranging and above-mentioned skirt piles P and fixing is squeezed in the bight of the lattice type bamboo net B that forms to lattice shape, on above-mentioned bamboo net B, use building fiber F to separate, the ruggedized construction on the soft foundation G top layer that the order of overburden layer C and chiltern soil layer S is formed, on the very soft natural soft foundation G or the artificial soft foundation G as landfill of soil conditions, for guaranteeing to build when reseting that the passage of safe passing is reinforced the soft foundation skin section fully, can save the material requested expense, improve soft foundation G and go up the safety of building with reseting the designated lane that is equipped with.
Claims (7)
1, a kind of bamboo net that utilizes is handled worker's method on soft foundation top layer, it is characterized in that, comprising:
Based on the design scheme that proposes among the present invention, the step of design bamboo net (B);
According to the bamboo net (B) and the thickness of earth covering of the suitable spacing that designs according to above-mentioned design scheme, the step of bamboo net (B) is set on object soft foundation (G);
Penetrate the step of skirt piles (P) in a certain at least bight of above-mentioned bamboo net (B);
Go up laying at above-mentioned bamboo net (B) and separate the step of using building fiber (F);
Go up the step of laying native sand and forming overburden layer (C) at above-mentioned building fiber (F);
Go up the step of laying sand and forming chiltern soil layer (S) at above-mentioned overburden layer (C);
Carry out plate being equipped with on the soft foundation (G) of above-mentioned bamboo net (B), confirm the step of the bearing capacity of this soft foundation (G).
2, the bamboo net that utilizes according to claim 1 is handled worker's method on soft foundation top layer, it is characterized in that,
Above-mentioned bamboo net (B) comprises the skirt piles (P) that a bamboo (10) and the mesh by above-mentioned tube bamboo (10) penetrate.
3, handle worker's method on soft foundation top layer according to claim 1 or the 2 described bamboo nets that utilize, it is characterized in that,
Above-mentioned stake (P) comprises any in a bamboo (10), bamboo chip (12), reed (14) or the sand pile (15).
4, handle worker's method on soft foundation top layer according to claim 1 or the 2 described bamboo nets that utilize, it is characterized in that,
Inboard central portion at above-mentioned skirt piles (P) is filled with sand (19).
5, the bamboo net that utilizes according to claim 1 is handled worker's method on soft foundation top layer, and wherein, the plate that calculates the bearing capacity of above-mentioned soft foundation comprises:
Select the step of the kind of load plate;
The step in the place of the object soft foundation of calculating plate;
Prepare the step of plate equipment;
The step of the physical property of determination object soft foundation;
Undermine, until the step of object hover ground basal plane;
Plane of load is organized into smooth step;
The step of load plate is set;
The step of assembling load device;
The step of assembling displacement measurement apparatus;
Loading pilot study load, the step of mensuration deflection;
Adjust the step at the zero point of load measurement device;
Adjust the step at the zero point of displacement measurement apparatus;
Interim ground load test load, the step of mensuration deflection at this moment;
Add load and deflection interimly and measure, until the step of the limit, anti-load condition or maximum load;
Put and analyze the step of above-mentioned measured value in order.
6, the bamboo net that utilizes according to claim 5 is handled worker's method on soft foundation top layer, it is characterized in that,
Above-mentioned analytic process is, undrained shear intensity Cu by estimating ground in all cases, to the correlation that bamboo net B carries out the rigidity of bearing capacity ratio BCR that load test obtains and the net of the bamboo under various condition B, utilize optimum regression analysis formula to calculate bearing capacity.
7, the bamboo net that utilizes according to claim 6 is handled worker's method on soft foundation top layer, it is characterized in that,
Above-mentioned bearing capacity ratio (BCR)=4.4909 (H/S)
0.6153,
Wherein, H is the earthing height, and S is the bamboo spacing in the bamboo net.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020080099015A KR101006082B1 (en) | 2008-10-09 | 2008-10-09 | The soft foundation surface processing method of construction for which bamboo net was used |
| KR10-2008-0099015 | 2008-10-09 | ||
| KR1020080099015 | 2008-10-09 |
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| CN101519870A true CN101519870A (en) | 2009-09-02 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101736734B (en) * | 2009-12-31 | 2014-02-26 | 郭艳景 | Quick strengthening method of extremely soft sludge |
| CN103614955A (en) * | 2013-11-25 | 2014-03-05 | 中国电力工程顾问集团西南电力设计院 | Treatment method for soft soil foundation construction road |
| WO2017037588A1 (en) * | 2015-08-28 | 2017-03-09 | Fellrock Developments Limited | Timber pole foundation structure |
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| KR100995800B1 (en) * | 2010-07-30 | 2010-11-22 | 최귀봉 | The method constructing a bamboo mat easily on the soft clay surface |
| CN102011394B (en) * | 2010-11-12 | 2012-11-14 | 赵莹莹 | Method for reinforcing aeolian sandy soil by polypropylene fibers |
| CN102912784A (en) * | 2012-11-08 | 2013-02-06 | 沈阳建筑大学 | Geotechnical cloth, twig and mountain stone combined treatment soft soil foundation |
| CN104099920B (en) * | 2013-04-08 | 2016-04-20 | 同济大学 | A kind of Reinforced Foundation |
| KR101660025B1 (en) * | 2016-01-18 | 2016-09-26 | 주식회사 한국항만기술단 | Strengthening Structures for Soft Ground |
| CN113186777A (en) * | 2021-05-26 | 2021-07-30 | 中国十九冶集团有限公司 | Temporary pavement built on soft soil foundation and construction method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2175933Y (en) * | 1993-11-24 | 1994-08-31 | 卢丽莎 | Deep-foundation flat load testing instrument |
| KR100464145B1 (en) * | 2000-10-30 | 2004-12-31 | 엘지전자 주식회사 | Method for Matching Manager Using Web in Private Branch Exchange System |
| KR200233322Y1 (en) * | 2001-03-21 | 2001-10-08 | 주식회사 한국항만기술단 | reinforcement structure for the outer layer of weak foundation |
| CN1385583A (en) * | 2002-05-31 | 2002-12-18 | 北京红菊绿谷荒漠化防治有限公司 | Method for fixing sand dune by sand-protecting barrier made of plant fibre |
| KR100675338B1 (en) * | 2004-07-29 | 2007-01-29 | 한국해양수산개발원 | The support power calculation method of the soft ground reinforced with bamboo net |
| KR100802168B1 (en) * | 2007-08-09 | 2008-02-11 | (주)우주엔지니어링 | Tenderness ground reinforcement structure using bamboo |
-
2008
- 2008-10-09 KR KR1020080099015A patent/KR101006082B1/en active IP Right Grant
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101736734B (en) * | 2009-12-31 | 2014-02-26 | 郭艳景 | Quick strengthening method of extremely soft sludge |
| CN103614955A (en) * | 2013-11-25 | 2014-03-05 | 中国电力工程顾问集团西南电力设计院 | Treatment method for soft soil foundation construction road |
| CN103614955B (en) * | 2013-11-25 | 2016-03-16 | 中国电力工程顾问集团西南电力设计院有限公司 | A kind of processing method of soft soil foundation construction road |
| WO2017037588A1 (en) * | 2015-08-28 | 2017-03-09 | Fellrock Developments Limited | Timber pole foundation structure |
| US10385532B2 (en) | 2015-08-28 | 2019-08-20 | Fellrock Developments Limited | Timber pole foundation structure |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101519870B (en) | 2013-04-17 |
| KR20100039994A (en) | 2010-04-19 |
| KR101006082B1 (en) | 2011-01-07 |
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