CN102644264B - Method for reinforcing soft soil foundation by adopting soft foundation light tamping mode - Google Patents
Method for reinforcing soft soil foundation by adopting soft foundation light tamping mode Download PDFInfo
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- CN102644264B CN102644264B CN201110038912.4A CN201110038912A CN102644264B CN 102644264 B CN102644264 B CN 102644264B CN 201110038912 A CN201110038912 A CN 201110038912A CN 102644264 B CN102644264 B CN 102644264B
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Abstract
The invention relates to a method for reinforcing a soft soil foundation by adopting a soft foundation light tamping mode, which comprises the following steps of: firstly, paving a permeable layer with the thickness of 20 to 30cm on the surface of a natural foundation; by preset tamping energy and tamping times, enabling foundation soil at a certain depth to be solidified; arranging drainage ditches in both longitudinal and transverse directions at intervals of 10 to 20m and also arranging drainage sumps at the intersections of the drainage ditches so as to timely eliminate accumulated water; after the processing on the natural foundation reaches the requirements, filling earthwork to a preset designed elevation; and paving a permeable layer with the thickness of 20 to 30cm on the surface of the earthwork; and by preset tamping energy and tamping times, compacting the filled layer and enabling soft foundation soil underlaid under the filled layer to be further solidified. Compared with the prior art, the invention provides a novel practical method for processing the soft soil foundation of an industrial building floor; and the method is simple and easy to actually operate and has the obvious advantages on the aspect of economic technical indexes.
Description
Technical field
The present invention relates to field of civil engineering, especially relate to a kind of method that adopts soft base gently to ram reinforcing soft ground.
Background technology
As the important component part of modern industry, China's industrial construction faces the vigorous market demand, especially in the soft clay area of riverine and coastal, especially in fast development.For example logistic storage has special requirement for building ground floor, need to meet multilayered memory shelf ground under full load condition and have good planeness, otherwise may cause the inclination of storing goods shelf or the fluctuation of service of dispensing goods fork truck.Therefore, the Soft Ground of industrial construction terrace is extremely important.
At present the soft-soil foundation treatment method for industrial construction terrace mainly contains: cushion, surcharge preloading method, mixing pile composite foundation method, ram closely knit method etc.With regard to present circumstances, see, every kind of method has pluses and minuses, and cushion facilitates feasible, but can only be applicable to the Soft Ground of shallow-layer, processes thickness and should not surpass 2m; Surcharge preloading method is soft soil foundation settlement issues effectively, but the duration needing is very long, for the engineering that has construction period, is unaccommodated; Cement mixing pile composite foundation reinforcing soft soil successful, the construction period is short, but expense is high and construction quality is difficult to control.Therefore, at the Yangtze River Delta, area, Pearl River Delta and the deep soft soil layer of other region following the line of the sea extensive development of China, demand economical rationality, the soft-soil foundation treatment method of quick construction is the technical barrier that restriction logistic storage building ground floor is built.
Feature based on industrial construction terrace to foundation strength and deformation requirements, the load that this building ground floor bears is also little, in 50kPa, is mainly that particularly inhomogeneous deformation has higher requirement to distortion conventionally.The present invention proposes the feature of processing means in conjunction with multiple ground, according to terrace load and foundation condition, adopt the foundation treatment mode of double-deck compacting to control soft soil base sedimentation.At natural ground and fill stratum surface, one deck pervious layer is respectively set, the existence of two pervious layers has guaranteed the consolidation effect of superficial part soil layer effectively, really can form the crust layer with construction value, plays the effect of stress diffusion.For the consolidation effect of each soil layer, also have quantitative detection index to control, natural ground is mainly by the static cone sounding curve comparative analysis before and after reinforcing, and is aided with and rams pile penetration; The fill stratum on surface is controlled by coefficient of consolidation, requires the coefficient of consolidation of ramming rear fill stratum should meet code requirement.Thereby reach, shorten the construction period, reduce the object of settlement after construction or relative settlement, and can significantly reduce the expense that ground is processed.Therefore, not only in economic and technical norms, there is obvious advantage, and social benefit is also very obvious.
Through inquiry patent database, not yet find at present to arrange the patent report that two pervious layers are rammed processing.Literature search is found, the method for ramming of vertical drainage plate or sand drain is set, although it is darker to process the degree of depth, construction costs is obviously higher; And the method for ramming of single pervious layer is only set, due to permeable path length, process not two pervious layer modes as proposed by the present invention of the degree of depth and successful; What is more important, the present invention processes natural ground and fill stratum respectively, so just can effectively guarantee the consolidation effect of natural ground, simultaneously ramming consolidation effect and also can be guaranteed for fill stratum.
Summary of the invention
Object of the present invention is exactly that settlement issues that a kind of effectively soft foundation is provided in order to overcome the defect that above-mentioned prior art exists, simple, economy are applicable to industrial construction terrace soft foundation dynamic consolidation processing method reliably.
Object of the present invention can be achieved through the following technical solutions:
A kind of method that adopts soft base gently to ram reinforcing soft ground, it is characterized in that, the method comprises the following steps: at foundation surface, lay the thick pervious layer of 20～30cm, by presetting, ram energy and ramming times and carry out soft base and gently ram, ramming of variable multipass makes foundation soil generation fixed, reach the object that significantly improves shallow soil modulus of compressibility, on the both direction in length and breadth of pervious layer, every 10～20m, a gutter is set, then fill cubic metre of earth height to predetermined backfill, finally on the surface of banketing, lay the thick pervious layer of 20～30cm, by presetting, ram energy and ramming times and carry out soft base and gently ram, ramming of variable multipass makes fill stratum compacting, and can make its lower sleeping weak foundation soil further fixed.
Described pervious layer adopts rubble, coarse sand or building waste to form.
The intersection point place in described gutter also can arrange collecting well.
In described gutter, also should lay rubble or coarse sand, guarantee the smooth movement of the equipment of ramming.
Described predetermined backfill thickness is 1～1.5m.
That tells rams as the soft base of employing strong rammer equipment gently rams, variable multipass completes.
The described energy of ramming is rammed and is determined by examination according to reinforcement depth and soil condition, and ramming to reinforce affect the degree of depth and can estimate with reference to Maynard (M é nard) formula, and described ramming times is by ramming penetration control.
Compared with prior art, the present invention has the following advantages:
(1) for fill stratum, process separately, both can guarantee the consolidation process effect of natural ground soil, can guarantee that again fill stratum reaches certain compactness;
(2) at natural ground and fill stratum surface, respectively have one deck pervious layer, the existence of two pervious layers has guaranteed the consolidation effect of superficial part soil layer effectively, really can form the crust layer with construction value, plays the effect of stress diffusion;
(3) consolidation effect of each soil layer has quantitative detection index and controls, and natural ground is mainly by load plate experiment or static cone sounding curve comparative analysis before and after reinforcing, and is aided with and rams pile penetration; The fill stratum on surface is controlled by coefficient of consolidation, requires the coefficient of consolidation of ramming rear fill stratum should meet code requirement.
Accompanying drawing explanation
Fig. 1 is longitudinal plan of the present invention;
Fig. 2 is A-A sectional drawing of the present invention.
In figure, 1 for the surperficial pervious layer that bankets, 2 is for fill stratum, 3 is for foundation surface pervious layer, 4 is for soft foundation, 5 is for soil layer, 6 is for gutter, 7 is for collecting well.
The specific embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Embodiment
Certain logistic storage building ground floor planar dimension is long 200m, wide 150m, and ground level 4.30m left and right, the depth of fill is 1.2m, has the silt clay that 7～8m is thick under foundation soil, the design load that building ground floor bears is 30kPa.By method for processing foundation proposed by the invention, process, to meet the bearing capacity requirement of this logistic storage building ground floor.
Foundation treatment mode for this logistic storage building ground floor is specific as follows:
First carry out levelling of the land, set settlement observation reference point, on the top of harder soil layer 5, it is soft foundation 4, on soft foundation 4, lay the hardcore bed of 20cm as foundation surface pervious layer 3, this foundation surface pervious layer 3 be building waste through suitably processing also can, the wide 20cm of simple and easy gutter 6(that on foundation surface pervious layer 3, spacing 15m excavation intersects in length and breadth, dark 10cm), in gutter, 6 infall excavates simple and easy collecting well 7 again, to discharge in time ponding while ramming.Adopt strong rammer equipment to carry out that soft base gently rams, the compacting of variable multipass, the pile penetration of on average ramming of last time is no more than 5cm, reaches the pile penetration of ramming of design, stops ramming minutes three time.Fill on request the fill stratum 2 that 1.2m is thick, filling the earthwork is requirement compaction in layers, and the hardcore bed of finally laying 20cm on the surface of fill stratum 2 is as the surperficial pervious layer 1 that bankets, tamp twice, average compactness reaches more than 0.9, stops ramming, and its structure is as shown in Fig. 1～2.
Employing arranges the method for processing foundation of two pervious layers, according to the actual conditions of engineering and geological conditions, determine the ability of ramming and ram end condition simultaneously, ramming energy is rammed and is determined by examination according to reinforcement depth and soil condition, ramming to reinforce affect the degree of depth and can estimate with reference to Maynard (M é nard) formula, and ramming times can reach satisfied effect by ramming penetration control.The Soft Ground that the present invention is industrial construction terrace provides new practical approach, has good economic benefit and application prospect.
Claims (6)
1. a method that adopts soft base gently to ram reinforcing soft ground, it is characterized in that, the method comprises the following steps: at foundation surface, lay the thick pervious layer of 20～30cm, by presetting, ram energy and ramming times and ram that foundation soil is produced is fixed, on the both direction in length and breadth of pervious layer, every 10～20m, a gutter is set, then fill cubic metre of earth height to predetermined backfill, finally on the surface of banketing, lay the thick pervious layer of 20～30cm, by presetting, ram energy and ramming times and ram and make fill stratum compacting.
2. a kind of method that adopts soft base gently to ram reinforcing soft ground according to claim 1, is characterized in that, described pervious layer adopts rubble, coarse sand or building waste to form.
3. a kind of method that adopts soft base gently to ram reinforcing soft ground according to claim 1, is characterized in that, the intersection point place in described gutter also arranges collecting well.
4. a kind of method that adopts soft base gently to ram reinforcing soft ground according to claim 1, is characterized in that, lays rubble or coarse sand in described gutter.
5. a kind of method that adopts soft base gently to ram reinforcing soft ground according to claim 1, is characterized in that, the height of described predetermined backfill is 1～1.5m.
6. a kind of method that adopts soft base gently to ram reinforcing soft ground according to claim 1, it is characterized in that, the described energy of ramming is undertaken by strong rammer equipment according to reinforcement depth and soil condition that soft base gently rams, the examination of variable multipass is rammed and determined, ramming to reinforce affect the degree of depth and can estimate with reference to Maynard (M é nard) formula, and described ramming times is by ramming penetration control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110038912.4A CN102644264B (en) | 2011-02-16 | 2011-02-16 | Method for reinforcing soft soil foundation by adopting soft foundation light tamping mode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110038912.4A CN102644264B (en) | 2011-02-16 | 2011-02-16 | Method for reinforcing soft soil foundation by adopting soft foundation light tamping mode |
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| Publication Number | Publication Date |
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| CN102644264A CN102644264A (en) | 2012-08-22 |
| CN102644264B true CN102644264B (en) | 2014-07-16 |
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| CN201110038912.4A Expired - Fee Related CN102644264B (en) | 2011-02-16 | 2011-02-16 | Method for reinforcing soft soil foundation by adopting soft foundation light tamping mode |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104234067A (en) * | 2014-10-08 | 2014-12-24 | 潘林有 | Method for treating coast weak soil unconsolidated soil |
| CN104674782A (en) * | 2014-11-04 | 2015-06-03 | 郑鲁平 | Foundation processing method based on sand well dynamic compaction composition of muddy soft soil |
| CN104988821A (en) * | 2015-06-17 | 2015-10-21 | 成都科创佳思科技有限公司 | Road drainage structure |
| CN106049406A (en) * | 2016-06-01 | 2016-10-26 | 上海建研地基基础工程有限公司 | Method for lightly tampering lime soil foundation |
| CN112359856A (en) * | 2020-11-05 | 2021-02-12 | 潍坊弘润新材料有限公司 | Gravity flow method hydraulic filling type foundation treatment construction process |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100721225B1 (en) * | 2006-02-23 | 2007-05-23 | 지호열 | Drainage structure for soft ground treatment and dehydration method |
| CN101021068A (en) * | 2007-03-09 | 2007-08-22 | 包国建 | Low-level prepressing drainage dynamic consolidating soft soil foundation processing method |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100721225B1 (en) * | 2006-02-23 | 2007-05-23 | 지호열 | Drainage structure for soft ground treatment and dehydration method |
| CN101021068A (en) * | 2007-03-09 | 2007-08-22 | 包国建 | Low-level prepressing drainage dynamic consolidating soft soil foundation processing method |
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