CN100487202C - Vibration pressurizing quick solidification soft foundation processing method - Google Patents
Vibration pressurizing quick solidification soft foundation processing method Download PDFInfo
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- CN100487202C CN100487202C CNB2007100202361A CN200710020236A CN100487202C CN 100487202 C CN100487202 C CN 100487202C CN B2007100202361 A CNB2007100202361 A CN B2007100202361A CN 200710020236 A CN200710020236 A CN 200710020236A CN 100487202 C CN100487202 C CN 100487202C
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Abstract
The invention discloses a processing method for quickly concreting soft groundsill by vibrating pressurization, characterized in: firstly deposing well sites according to the required clearances and depths and vacuumly pumping water in the to-be-processed stratum to form vacuum negative pressure; when making vibrate-impacting pressurization in the stratum according to the required clearances and depths, forming positive pressure; synchronously making vacuum water pumping and vibration above once and overlapping negative and positive regions and forming higher hydrodynamic force gradient, and finally finishing quick concretion of soft soil in short time. And its beneficial effects: having less deposition after processing, and having advantages of short processing time, better processing effect, lower manufacturing cost, etc, and having good economic benefits and wide application prospect.
Description
Technical field
The present invention relates to a kind of coastal riverine saturated soft soil ground treatment construction method along the lake along the river, particularly will adopt positive pore water pressure that the vibroflotation method disturbance soil body produces and the vacuum negative pressure that is produced of drawing water to combine, multipass ground produces under higher moving waterpower degree of passing (vibration pressurizing) effect in the short time and carries out draining synchronously, make the soil body rapidly solidified, improve bearing capacity and reduce a kind of soft foundation processing method of settlement after construction, belong to Soft Ground technical field in the geotechnical engineering.Specifically, be the method that a kind of vibration pressurizing quick solidification soft foundation is handled.
Background technology
1, subgrade is handled and is had broad application prospects
Along with the minimizing that utilizes the soil and the enhancing of people's environmental protection consciousness can be supported in the city, in recent years people in coastal, river, soft-foundation engineering increasing (for example: prince wife Cao pasture Shoudu Iron and Steel Co human relocation project, Shenzhen Airport enlarging, Nanhui District Harbor, Shanghai new city, Changxing Island shipbuilding base, Shanghai or the like all are to carry out building of the construction divine force that created the universe on soft base) along the river.The common water content of most of weak soil, compressibilty is very high, permeability is very poor, must could satisfy instructions for use through handling, the just in short supply and national relevant planning of reclaiming fields from the sea of land resources at present, this class engineering also can roll up in the future, thereby the subgrade processing has wide application prospect.
2, the deficiency of traditional method for processing foundation
The processing method that weak soil is commonly used mainly contains consolidation at present, replacement cushion method, roll and the compacting method, replace and admix method etc., these methods all have the scope of application separately, consolidation is applicable to the almost most of subgrade except the peat soil of permeance property extreme difference, mainly comprise preloading and vacuum method, preloading is meant the interim stone etc. that bankets of piling in the place, ground is handled the loading precompressed, settlement of foundation can be fulfiled ahead of schedule, and by the fixed raising bearing capacity of foundation soil of foundation soil, shed prefabricating load again after reaching requirement, this method has 3 deficiencies: a large amount of cubic metres of earth and stone are arranged near one needs, and cost is than higher; Its two preloading is highly crossed conference and is brought the slope stability problem; Its three duration is longer.Vacuum method is to intend laying sand cushion on the Ground Treatment, and vertical drainage passage (plastic draining board or sand drain) is set, and then use the diaphragm seal sand cushion, with vacuum pump sand cushion and vertical drainage passage are bled, vacuum is reduced, under the atmospheric pressure effect, quicken ground consolidation simultaneously, stop to bleed after reaching requirement, the weak point of this method is: one Ground Treatment bearing capacity is limited, about general 80kPa; Its two duration is longer.Replacement cushion method is that the weak soil in the ground is cut out, and is intensity height, sand, rubble or dirt etc. that density is big and change to fill out, and this method relatively is fit to local a spot of treatment of soft foundation, and large tracts of land, darker treatment of soft foundation economy are unreasonable, and the waste duration.Roll and the compacting method is to adopt certain plant equipment, with the foundation soil compacting, improve a kind of method of intensity simultaneously, the advantage of this method is that the construction period is short, intensity improves obviously, but generally only be applicable to cohesionless soil, miscellaneous fill, unsaturation cohesive soil etc., not too suitable for the weak soil that water content height, intensity are extremely low.
Summary of the invention
It is little to the purpose of this invention is to provide a kind of processing back sedimentation, and has advantages such as short, effective and cost of the duration of processing is lower, has the method for the vibration pressurizing quick solidification soft foundation processing of good economic benefit and wide application prospect.
Technical solution of the present invention is: the method that a kind of vibration pressurizing quick solidification soft foundation is handled is characterized in that: at first carry out vacuum by required spacing and degree of depth layout well point in pending stratum and draw water, form negative pressure of vacuum; When in the stratum, shaking towards supercharging again, form malleation by the desired spacing and the degree of depth; Vacuum is drawn water and is vibrated synchronously more than one time, and makes negative pressuren zone and zone of positive pressure superposition, and form higher moving hydraulic gradient between the two, finally finishes at short notice rapidly solidified of soft soil.
Vacuum described in the present invention formation negative pressure of drawing water, it is the vacuum tube that in the stratum, inserts certain depth at a certain distance, the face of land is connected by the horizontal drainage passage, drive strong vacuum with vacuum pump, every vacuum tube is equivalent to a negative pressure source, makes negative pressure stratum radiation towards periphery, forms cylindric negative pressuren zone, central negative pressure is minimum, successively decreases towards periphery gradually.Vacuum tube length, spacing, filter screen length, vacuum, vacuum time of pumping and shake towards parameters such as dot spacing, the degree of depth, vibration force, vibration frequency and vibration number by calculate determining.Intend in the stratum handling when keeping the vacuum pumping system that soil body water content reaches or during as far as possible near its maximum adsorption water of hydration Atterberg limits, between two vacuum pumping pipes, vibrating impacter is lowered into place, plan processing stratum and carries out up-down vibrating, the excess pore water pressure that increases this place is that each vibrating impacter surrounding soil is equivalent to a positive pressure source, the stratum radiation towards periphery of this positive pressure source, form circular zone of positive pressure, leave vibrating impacter and successively decrease gradually towards periphery.Be the negative pressuren zone at center with the vacuum tube and be the zone of positive pressure superposition at center with the vibrating impacter and between the two, form higher moving hydraulic gradient.Drawing water and shake towards two procedures combine synchronous one time or multipass in the vacuum well point, is concatenated to form higher moving hydraulic gradient in the stratum, constantly reduces soil body water content under the effect of moving hydraulic gradient, improve the degree of consolidation and intensity, until reaching designing requirement.Vibration pressurizing is to insert plan to handle the place, stratum: deep layer 〉=6m or shallow-layer＜6m make soil body generation rapidly solidified with direct loading of negative pressure of vacuum superposition.
Beneficial effect of the present invention is: compare with vacuum method: the duration is short; Cost is low; Need not to lay diaphragm seal; Can handle the worse weak soil of permeability.Compare with preloading: need not filler; Cost is low; Duration is short.Compare with dynamic compaction: not only can handle sand, silt, can also handle saturated soft soil; Vibration pressurizing is not on the face of land, but directly loads down, and it is big to handle the degree of depth; Settlement after construction is little.Compare with High vacuum compacting method: can handle mud, mucky soil; Vibration pressurizing is not on the face of land, but directly loads down, and it is big to handle the degree of depth; Settlement after construction is little; It is low to reach same index cost.
Because the general water content height of saturated soft clay, void ratio is big, permeance property is poor, conventional vacuum method and preloading handle that not only the time is long and also cost than higher, dynamic compaction only is suitable for coarse granule, high permeability formation, High vacuum compacting method is for silt, sand is reinforced relatively effectively but is still powerless to hypotonicity soil, the present invention is intended to adopt vibroflotation method directly to improve the excess pore water pressure of intending handling stratum hypotonicity soil, with the synchronous multipass of vacuum negative pressure two-way (malleation and negative pressure) pressure effect under, make the soil body take place rapidly solidified and improve intensity and reduce settlement amount after construction, this worker's method can be handled the relatively poor mud of permeability, mucky soil, but make the vibroflotation method process range expand to the saturated soft soil ground by sand.
Description of drawings
Fig. 1 is the microcosmic mechanism figure of the method consolidated subsoil of a kind of vibration pressurizing quick solidification soft foundation processing of the present invention;
Fig. 2 is the fixed figure of negative pressure of vacuum in the method construction process of handling for a kind of vibration pressurizing quick solidification soft foundation of the present invention;
Fig. 3 is the fixed figure of punching crack water pressure malleation that shakes in the method construction process of handling for a kind of vibration pressurizing quick solidification soft foundation of the present invention;
Fig. 4 is shaking towards the fixed figure of vacuum positive/negative pressure superposition in the method construction process of a kind of vibration pressurizing quick solidification soft foundation processing of the present invention.
The specific embodiment
Among Fig. 1: 1 is the effective stress before handling; 2 for the effective stress of precipitation enhancement; 3 effective stresses of drawing water and increasing for vacuum; 4 effective stresses for the vibration increase; 5 for handling remaining pore water pressure.Among Fig. 2: 21 is vacuum pump; 22 is the horizontal drainage passage; 23 is stratum one; 24 for intending handling stratum two; 25 are following stratum three for sleeping in; 26 is vacuum tube; 27 for being the negative pressuren zone at center with the vacuum tube.Among Fig. 3: 23 is stratum one; 24 for intending handling stratum two; 25 are following stratum three for sleeping in; 31 is vibrating impacter.Among Fig. 4: 21 is vacuum pump; 22 is the horizontal drainage passage; 23 is stratum one; 24 for intending handling stratum two; 25 are following stratum three for sleeping in; 26 is vacuum tube; 27 for being the negative pressuren zone at center with the vacuum tube; 31 is vibrating impacter; 41 for vibrating impacter be the excess pore water pressure zone of positive pressure at center.
The vibration pressurizing quick solidification ground treatment construction method belongs to Dynamic Drainage Consolidation Method, when vibrating impacter enters when working in the saturated soft soil, at high frequency, under periodic vibration power and the lateral compression effect, make frictional force minimizing between the particle, particle rearranges, pore water pressure raises and can not in time dissipate, the soil body produces liquefaction phenomenon, grogs gathers to the low-potential energy position, and form high pore water pressure district at the vibrating impacter sidewall, it is high water head gesture position, the negative pressure that itself and vacuum drainage produce is that low water head gesture position forms than big flood impetus potential difference, underground water accelerated motion under this head gesture potential difference effect has strengthened the vacuum drainage water yield, reduces the water content in the weak soil fast and quickens fixed.The microcosmic mechanism of its consolidated subsoil is illustrated in fig. 1 shown below:
Adopt the vibration pressurizing quick solidification method to handle the plan shown in Fig. 1 and handle stratum two, the total stress before handling in the stratum is made up of effective stress and pore water pressure, and effective stress is 2 among the figure, and pore water pressure is formed by 2,3 and 5; Carry out vacuum draw water a back part since the precipitating, pre-pressing pore water pressure transform for effective stress promptly 2, another part since the reduction pore water pressure of water content transform for effective stress promptly 3; Carrying out having produced excess pore water pressure in the stratum, vibroflotation method technology construction back is 4, along with dissipation transforms into effective stress; Last remaining pore water pressure is 5.
The treatment effect that more than illustrates the vibration pressurizing quick solidification method is that vacuum is drawn water and the superposition that vibrates the two, and the pore water pressure that reduces separately and increase is converted into the effective stress of the soil body the most at last, and intensity is improved.
Fig. 2 is a vibration pressurizing quick solidification method Foundation Treatment flow process, the following statement of the specific embodiment:
1, by calculating definite vacuum tube length, spacing, filter screen length, vacuum, vacuum time of pumping and shaking towards parameters such as dot spacing, the degree of depth, vibration force, vibration frequency and vibration number.
2, in the stratum, insert the vacuum tube of certain depth at a certain distance, shown in Fig. 2-a, the face of land is connected by the horizontal drainage passage, drive strong vacuum with vacuum pump, every vacuum tube is equivalent to a negative pressure source, makes negative pressure stratum radiation towards periphery, forms cylindric negative pressuren zone, central negative pressure is minimum, successively decreases towards periphery gradually.
3, intend in the stratum handling when keeping the vacuum pumping system that soil body water content reaches or during as far as possible near its maximum adsorption water of hydration Atterberg limits, between two vacuum pumping pipes, vibrating impacter is lowered into place, plan processing stratum and carries out up-down vibrating shown in Fig. 2-b, the excess pore water pressure that increases this place is that each vibrating impacter surrounding soil is equivalent to a positive pressure source, the stratum radiation towards periphery of this positive pressure source, form circular zone of positive pressure, leave vibrating impacter and successively decrease gradually towards periphery.
4, be the negative pressuren zone at center with the vacuum tube and be the zone of positive pressure superposition at center with the vibrating impacter and between the two, form higher moving hydraulic gradient, according to Darcy's law, the increase of hydraulic gradient means the increase of water in soil flow velocity degree, and the fixed of the soil body accelerated in the increase of water velocity.Negative pressure of vacuum just all has certain consolidation towards malleation the two itself to the soil body with shaking, and superposition has been accelerated the consolidation rate of the soil body later on, and it is rapidly solidified that soft soil is obtained at short notice, shown in Fig. 2-c.
5, multipass carries out step 1) and 2 synchronously), in the stratum, be concatenated to form higher moving hydraulic gradient, under the effect of moving hydraulic gradient, constantly reduce soil body water content, improve the degree of consolidation and intensity, until reaching designing requirement.
Claims (4)
1, a kind of method of vibration pressurizing quick solidification soft foundation processing, it is characterized in that: at first in pending stratum, carry out vacuum and draw water by required spacing and degree of depth layout well point, form negative pressure of vacuum:, form malleation when in the stratum, shaking towards supercharging again by the desired spacing and the degree of depth; Vacuum is drawn water and vibration is more than one time, and makes negative pressuren zone and zone of positive pressure superposition, and forms higher moving hydraulic gradient between the two, finally finishes at short notice rapidly solidified of soft soil; The vacuum formation negative pressure of drawing water, it is the vacuum tube that in the stratum, inserts certain depth at a certain distance, the face of land is connected by the horizontal drainage passage, drive strong vacuum with vacuum pump, every vacuum tube is equivalent to a negative pressure source, makes negative pressure stratum radiation towards periphery, forms cylindric negative pressuren zone, central negative pressure is minimum, successively decreases towards periphery gradually; Vacuum tube length, spacing, filter screen length, vacuum, vacuum time of pumping and shake towards dot spacing, the degree of depth, vibration force, vibration frequency and vibration number by calculate determining; Intend in the stratum handling when keeping the vacuum pumping system that soil body water content reaches or during as far as possible near its maximum adsorption water of hydration Atterberg limits, between two vacuum pumping pipes, vibrating impacter is lowered into place, plan processing stratum and carries out up-down vibrating, the excess pore water pressure that increases this place is that each vibrating impacter surrounding soil is equivalent to a positive pressure source, the stratum radiation towards periphery of this positive pressure source, form circular zone of positive pressure, leave vibrating impacter and successively decrease gradually towards periphery.
2, the method handled of vibration pressurizing quick solidification soft foundation according to claim 1 is characterized in that: be the negative pressuren zone at center with the vacuum tube and be the zone of positive pressure superposition at center with the vibrating impacter and form higher moving hydraulic gradient between the two.
3, the method for vibration pressurizing quick solidification soft foundation processing according to claim 2, it is characterized in that: draw water and shake and be integrated as one time or multipass towards two procedures in the vacuum well point, in the stratum, be concatenated to form higher moving hydraulic gradient, under the effect of moving hydraulic gradient, constantly reduce soil body water content, improve the degree of consolidation and intensity, until reaching designing requirement.
4, vibration pressurizing quick solidification soft foundation processing method according to claim 1 is characterized in that: vibration pressurizing is to insert plan to handle the place, stratum: deep layer 〉=6m or shallow-layer＜6m make soil body generation rapidly solidified with direct loading of negative pressure of vacuum superposition.
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| CN101581092B (en) * | 2009-06-09 | 2012-02-15 | 陈杰德 | Method for processing soft ground by rapid pressurizing pre-compression |
| CN103898892A (en) * | 2014-03-06 | 2014-07-02 | 中交天津港湾工程研究院有限公司 | Processing method and device for reinforcing soft foundation by hydraulic vibration combined with vacuum water suction |
| CN103938611A (en) * | 2014-04-30 | 2014-07-23 | 中交天津港湾工程研究院有限公司 | Reinforcing method suitable for soft soil foundation with sandwiched sand layer |
| CN104517006B (en) * | 2014-10-30 | 2018-05-08 | 河海大学 | Cohesiveless soil anisotropy mechanical characteristic microcosmic mechanism method for numerical simulation |
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| 真空击密法处理公路软基. 刘峰增.广东交通职业技术学院学报，第5卷第2期. 2006 |
| 真空击密法处理公路软基. 刘峰增.广东交通职业技术学院学报，第5卷第2期. 2006 * |
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