CN204940244U - The compacted device melting contracting fracturing method soft ground treatment of a kind of frost heave - Google Patents
The compacted device melting contracting fracturing method soft ground treatment of a kind of frost heave Download PDFInfo
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- CN204940244U CN204940244U CN201520667898.8U CN201520667898U CN204940244U CN 204940244 U CN204940244 U CN 204940244U CN 201520667898 U CN201520667898 U CN 201520667898U CN 204940244 U CN204940244 U CN 204940244U
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Abstract
The utility model discloses the compacted device melting contracting fracturing method soft ground treatment of a kind of frost heave, comprise dot matrix distribution and be embedded in the cryovial treated in stabilization by drainage weak soil, also comprise dot matrix distribution and be embedded in the plastic draining board treated in stabilization by drainage weak soil, cryovial and plastic draining board are in staggered distribution, plastic draining board is communicated with header tank by vacuum jet pump, cryovial one end is communicated with brine recycling case, the other end is communicated with brine recycling case by brine pump, and brine recycling case is connected with brine-cooled device.Utilize the fine grained weak soil soil body to have obvious frost heaving when freezing, the compacted pressure field of the Vacuum Pressure field of force and frost heave " is effectively superposed ", moisture rate of discharge can be made to improve several times.
Description
Technical field
The utility model relates in rock mechanics and engineering field fine grained weak soil soil body discharging consolidation foundation treatment technology field, be specifically related to the compacted device melting contracting fracturing method soft ground treatment of a kind of frost heave, this device is not only applicable to all kinds of highly sensitive saturated soft clay foundation and reinforces, and be applicable to initial bearing capacity be substantially zero based on fine grained and all kinds of dredging and reclamation silt soil is dark, in shallow-layer gamut while reinforcing.
Background technology
The most often adopt technique of soft soil foundation treatment, combined vacuum and surcharge preloading technology at present, but the fine grained weak soil that technique of soft soil foundation treatment, combined vacuum and surcharge preloading technology etc. are all high for sticky content, transmission coefficient is extremely low exists following not enough: (1) drainage efficiency is low, (2) the vacuum load duration is long, energy consumption is large, (3) treating depth and treatment effect (supporting capacity) limited.
Because the soil body after manual pipe jacking has, integrality is good, intensity is high, fluid-tight feature, as far back as 19th century, people adopt the method for manual pipe jacking strengthening stratum, solve all kinds of problems of subsiding of soft water bearing ground construction, as the southern constructing tunnel etc. in moral colliery, Oslo, Norway bay Construction of Submarine Tunnel in 1997,1955 China's artificial wetland Linxi ventilating shafts constructions, east side, Beijing Metro international trade bridge station in 1998 when the mine, Wales, Britain south of 1862, German Alba in 1883.Increasing along with China's city underground engineering, freezing process has been widely used in city underground engineering.For these engineerings, frost heave is disadvantageous, as frost heave can produce destruction to surface buildings, traffic and underground utilities (as power cable, communication cable, confession, gutter, gas flue etc.).
But for large-area fine grained weak soil, owing to being also in state to be developed, frost heave not only can not cause the destruction of works or structure, the volume of frost heave can also be utilized to increase, the feature of footprint, frost heave area peripheral edge weak soil is subject to frost-heave force, produces crimp thus the consolidation of acceleration weak soil and draining.
Utility model content
The purpose of this utility model is the problems referred to above being to exist for prior art, provide the compacted device melting contracting fracturing method soft ground treatment of a kind of frost heave, this apparatus structure is simple, be easy to implement, good stability, practical, and according to the real-time reinforcing situation configuration frost heave of the soil body and compression process can be melted, drainage efficiency is high, flexibility ratio and strong adaptability, be with a wide range of applications.
Above-mentioned purpose of the present utility model is achieved through the following technical solutions:
The compacted device melting contracting fracturing method soft ground treatment of a kind of frost heave, comprise dot matrix distribution and be embedded in the cryovial treated in stabilization by drainage weak soil, also comprise dot matrix distribution and be embedded in the plastic draining board treated in stabilization by drainage weak soil, cryovial and plastic draining board are in staggered distribution, plastic draining board is communicated with header tank by vacuum jet pump, cryovial one end is communicated with brine recycling case, and the other end is communicated with brine recycling case by brine pump, and brine recycling case is connected with brine-cooled device.
Brine-cooled device as above comprises ammonia circulation line in the case that is arranged in brine recycling case, in case, ammonia circulation line one end is connected with shell and tube cycle condenser by ammonia compressor, shell and tube cycle condenser is connected with cooling tower, and cooling tower is connected with the ammonia circulation line other end in case by cooling water pump.
The compacted device melting contracting fracturing method soft ground treatment of a kind of frost heave, also comprise and being all responsible for vacuum drainage arm and vacuum drainage according to the level of setting pitch arrangement, the top of plastic draining board is connected with vacuum drainage arm, vacuum drainage supervisor be connected with vacuum jet pump, and vacuum jet pump is connected with header tank.
Cryovial one end as above is connected with salt solution outlet arm, the other end is connected with brine loop arm, salt solution outlet arm connects salt solution outlet supervisor, brine loop arm connects brine loop supervisor, salt solution outlet supervisor connects brine recycling case, and brine loop supervisor connects brine recycling case by brine pump.
Cryovial as above forms stabilization zone, and stabilization zone covers diaphragm seal, and the diaphragm seal of stabilization zone periphery is placed in treats stabilization by drainage weak soil.
Know-why: according to water zero centigrade freeze process in, volume increase and produce footprint, make the effect being subject to frost-heave force of periphery object.The frost heave of fine grained soil is not that pore water 9% volume expansion causes, and also has moisture to cause to freezing front glaciation.Freeze after water translocation often to form ice lens.But for large-area fine grained weak soil, owing to being also in development status, frost heave not only can not cause the destruction of works or structure, and the volume of frost heave can also be utilized to increase, the feature of footprint, frost heave area peripheral edge weak soil produces crimp thus causes soil solidifying to be accelerated.The fine grained weak soil soil body has obvious frost heaving when freezing, in the process of ice-out, can cause soil body volume-diminished again, soil body tension and produce more stretch-draw crack, and void ratio increases, and water permeability, compression coefficient all increase several times.And due to the particle size of clay little, specific area is large, and the effect on soil particle and liquid phase surface is strong, and along with the increase of voids volume, free water content increases, and the mobility of water strengthens, permeability raising.When frozen soil melts, ice becomes water and volume reduces, and cause the displacement again of soil particle, existing macrovoid can not return to the fine pore before freezing, and causes the soil body to become loose, and void ratio increases, and coefficient of transmissibility increases.The change of coefficient of transmissibility directly affects generation and the elimination of excess pore water pressure in consolidation process, accelerates the distortion process of having melted soil.So the crack rate of the soil body and the change of moisture content can cause the change of soil body permeability in frozen-thaw process.Again in conjunction with vacuum preloading drainage system, when frost heave, the compacted pressure field of the Vacuum Pressure field of force and frost heave " is effectively superposed ", moisture rate of discharge can be made to improve several times; When melting contracting, because soil mass crack becomes many, the soil body is more loose, and void ratio increases, and coefficient of transmissibility increases, and under vacuum pressure field condition, also accelerates the discharging consolidation of the soil body.
The utility model compared with prior art, has the following advantages:
1) the compacted system of frost heave is devised, in conjunction with under the condition of vacuum preloading, utilize the fine grained weak soil soil body to have obvious frost heaving when freezing, the compacted pressure field of the Vacuum Pressure field of force and frost heave " is effectively superposed ", moisture rate of discharge can be made to improve several times;
2) above-mentioned frost heave compacted melt contracting fracturing circulation in, the soil body melts contracting tension and produces more stretch-draw crack, the soil body is caused to become loose, void ratio increases, coefficient of transmissibility, compression coefficient all increases several times, accelerates generation and the elimination of excess pore water pressure in consolidation process, drainage efficiency significantly improves, thus makes the soil body rapidly solidified.
3) once reinforcing can process deep layer weak soil, and shallow-layer and deep layer bearing capacity all can reach more than 80kPa;
4) adopt said system effectively can reduce load time, improve discharging consolidation efficiency, basement process Equalsettlement, reduction of erection time, economy clear superiority.
5) all kinds of fine grained weak soil such as different water cut, the different sticky content soil body can be processed easily and flexibly, have applied widely.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model;
Fig. 2 is the utility model layout schematic diagram.
In figure: 1, cooling tower; 2, cooling water pump; 3, shell and tube cycle condenser; 4, ammonia compressor; 5, brine recycling case; Ammonia circulation line in 5a, case; 6, brine pump; 7, salt solution outlet supervisor; 8, brine loop supervisor; 9, salt solution outlet arm; 10, brine loop arm; 11, vacuum jet pump; 11a, spout hole; 12, plastic draining board; 13, level is to vacuum drainage arm; 14, cryovial; 15, stabilization by drainage weak soil or ultra-soft silt soil is treated; 16, level is responsible for vacuum drainage; 17, the vacuum meter of under-membrance vacuum degree is sealed; 18, pvc pipe; 19, header tank.
Detailed description of the invention
Below in conjunction with accompanying drawing, the technical solution of the utility model is described in further detail.
Embodiment 1
The compacted device melting contracting fracturing method soft ground treatment of a kind of frost heave, comprise dot matrix distribution and be embedded in the cryovial 14 treated in stabilization by drainage weak soil, also comprise dot matrix distribution and be embedded in the plastic draining board 12 treated in stabilization by drainage weak soil, cryovial 14 and plastic draining board 12 are in staggered distribution, plastic draining board 12 is communicated with header tank 19 by vacuum jet pump 11, cryovial 14 one end is communicated with brine recycling case 5, the other end is communicated with brine recycling case 5 by brine pump 6, and brine recycling case 5 is connected with brine-cooled device.
Preferably, brine-cooled device comprises ammonia circulation line 5a in the case that is arranged in brine recycling case 5, in case, ammonia circulation line 5a one end is connected with shell and tube cycle condenser 3 by ammonia compressor 4, shell and tube cycle condenser 3 is connected with cooling tower 1, and cooling tower 1 is connected with the ammonia circulation line 5a other end in case by cooling water pump 2.
Preferably, also comprise and be all responsible for 16 according to the level of setting pitch arrangement to vacuum drainage arm 13 and vacuum drainage, the top of plastic draining board 12 is connected with vacuum drainage arm 13, and vacuum drainage supervisor 16 is connected with vacuum jet pump 11, and vacuum jet pump 11 is connected with header tank 19.
Preferably, cryovial 14 one end is connected with salt solution outlet arm 9, the other end is connected with brine loop arm 10, salt solution outlet arm 9 connects salt solution outlet supervisor 7, brine loop arm 10 connects brine loop supervisor 8, salt solution outlet supervisor 7 connects brine recycling case 5, and brine loop supervisor 8 connects brine recycling case 5 by brine pump 6.
Preferably, cryovial 14 forms stabilization zone, and stabilization zone covers diaphragm seal, and the diaphragm seal of stabilization zone periphery is placed in treats stabilization by drainage weak soil.
The compacted method of melting contracting fracturing method soft ground treatment of frost heave, comprises the following steps:
Step 1, treating on stabilization by drainage weak soil, laying sand cushion, in short supply or when stabilization by drainage weak soil is ultra-soft silt soil 15 in sand source, lay one deck woven cloth and also overlay non-woven geotextile;
Step 2, set to enter and treat in stabilization by drainage weak soil by cryovial 14 with dot matrix distribution, each cryovial 14 forms stabilization zone, and is submerged in top on cryovial 14 to treat the stabilization by drainage weak soil surface set degree of depth;
Step 3, cryovial 14 one end is connected salt solution outlet arm 9, the other end connects brine loop arm 10, salt solution outlet arm 9 connects salt solution outlet supervisor 7, brine loop arm 10 connects brine loop supervisor 8, salt solution outlet supervisor 7 directly connects brine recycling case 5, brine loop supervisor 8 connects brine pump 6, and brine pump 6 connects brine recycling case 5, and in the case in brine recycling case 5, ammonia circulation line 5a connects ammonia compressor 4; Ammonia compressor 4 connecting column tubular circulation condenser 3, shell and tube cycle condenser 3 is connected with cooling tower 1, and cooling tower 1 is connected with cooling water pump 2, and cooling water pump 2 is connected with ammonia circulation line 5a in the case in brine recycling case 5.
Step 4, the plastic draining board 12 in a row inserted, layout stagger with cryovial 14 and arrange with lattice-like, and making plastic draining board 12 upper end exposure on non-woven geotextile or sand cushion;
Step 5, according to setting pitch arrangement level to vacuum drainage arm 13;
Step 6, according to setting pitch arrangement level to vacuum drainage supervisor 16;
Step 7, exposure position, upper end at plastic draining board 12, connect plastic draining board 12 non-woven geotextile bar with the corresponding opening part colligation of level to vacuum drainage arm 16, forms vacuum preloading drainage system;
Lay diaphragm seal above step 8, stabilization zone, and stabilization zone peripheral sealing film is inserted treat in stabilization by drainage weak soil;
Step 9, laying vacuum jet pump 11;
Step 10, unlatching vacuum jet pump 11, make plastic draining board 12, level be in negative pressure state to vacuum drainage arm 13, level to vacuum drainage supervisor 16;
Step 11, vacuum meter 17 by monitoring sealing under-membrance vacuum degree, the adjustment power of jet pump 11 or quantity, under whole diaphragm seal, vacustat is at setting range, at interval of setting-up time make whole sealing under-membrance vacuum degree be interim incremental variations once;
Step 12, the situation of change of speed of being catchmented by header tank 19 statistics, draw catchment speed and time curve, catchment speed and time curve to reach slope be 0 time, unlatching brine pump 6, cooling water pump 2 and ammonia compressor 4;
Step 13, continue through header tank 19 and to monitor and drafting is catchmented speed and time curve, when the slope of catchment speed and time curve is 0 again, closing brine pump 6, cooling water pump 2 and ammonia compressor 4 makes soil body generation of naturally thawing melt draw gap, after the soil body thaws completely, again open brine pump 6, cooling water pump 2 and ammonia compressor 4 behind setting-up time interval;
Step 14, repetition above-mentioned steps 12,13, until treat that the shear strength that the soil moisture content of stabilization by drainage weak soil, the injection stress of static sounding and vane-shear are tested reaches setting requirement.
Embodiment 2:
The compacted device melting contracting fracturing method soft ground treatment of frost heave, comprises frost heave system and vacuum preloading drainage system two parts.
Frost heave system, comprises brine recycling subsystem and ammonia cycle subsystem.
Brine recycling subsystem includes brine recycling case 5, brine pump 6, salt solution outlet supervisor 7, brine loop supervisor 8, salt solution outlet arm 9, brine loop arm 11, cryovial 14.Its Main Function is by the Saline Absorbent treated in the heat cryovial 14 of stabilization by drainage weak soil or the ultra-soft silt soil soil body, by brine pump 6, salt solution is pumped into brine loop arm 11 and brine loop supervisor 8 again, until brine recycling case 5, then by salt solution outlet supervisor 7, salt solution outlet arm 9 and cryovial 14, hypothermic saline is entered again the salt solution of cooling to treat to circulate in stabilization by drainage weak soil or the ultra-soft silt soil soil body.
Ammonia recycle system comprises cooling tower cooling tower 1, cooling water pump 2, shell and tube cycle condenser 3, ammonia compressor 4, ammonia circulation line 5a in case, its Main Function is that the process that the heat carried by the salt solution in brine recycling case 5 becomes gaseous state by ammonia from liquid state absorbs, again ammonia ammonia compressor 4 is carried out compression and form high pressure ammonia gas, by shell and tube cycle condenser 3, high pressure ammonia gas is cooled to ammoniacal liquor, by cooling water pump 2, ammoniacal liquor is pumped into cooling tower 1 again ammoniacal liquor is lowered the temperature, finally the low temperature ammoniacal liquor of cooling tower 1 is connected ammonia circulation line 5a in the case in brine recycling case 5 and again absorb the heat of salt solution, enter and circulate next time.After repeatedly circulating, cryovial is made to treat stabilization by drainage weak soil or ultra-soft silt soil body frost heaving, thus compacted periphery weak soil, make it produce distortion, accelerate the discharging consolidation of periphery weak soil.Described contracting fracturing of melting refers to brine circulation system and ammonia recycle system closedown, thus makes the soil body of frost heave melt contracting, increases soil mass crack, increases void ratio, make coefficient of transmissibility improve several times, accelerate the discharging consolidation of the soil body.
Frost heave system, its connected mode is: cryovial 14 one end is connected salt solution outlet arm 9, the other end connects brine loop arm 10, salt solution outlet arm 9 connects salt solution outlet supervisor 7, brine loop arm 10 connects brine loop supervisor 8, and salt solution outlet supervisor 7 directly connects brine recycling case 5, and brine loop supervisor 8 connects brine pump 6, brine pump 6 connects brine recycling case 5, and brine recycling case 5 is connecting column tubular circulation condenser 3 and ammonia compressor 4 respectively; In ammonia compressor 4 connecting column tubular circulation condenser 3, shell and tube cycle condenser 3 is connected with cooling tower 1 with cooling water pump 2, and cooling water pump 2 is directly connected with cooling tower 1.
Vacuum preloading drainage system comprises vacuum jet pump 11, spout hole 11a, plastic draining board 12, level to vacuum drainage arm 13, level to vacuum drainage supervisor 16, the vacuum meter 17, pvc pipe 18, the header tank 19 that seal under-membrance vacuum degree.Its effect one of diaphragm seal, transmit vacuum and get rid of moisture, specifically by the negative pressure that vacuum jet pump 11 is formed, plastic draining board 12 is passed to vacuum drainage supervisor 16 and level to vacuum drainage arm 13 by the level connecting vacuum jet pump 11, treat that the water of stabilization by drainage weak soil or ultra-soft silt soil enters plastic draining board 12 under the effect of negative pressure, then be discharged in the water tank of vacuum jet pump 11 to vacuum drainage supervisor 16 to vacuum drainage arm 13 and level by level.Its effect two, monitor speed of catchmenting, be specially and the water in spout hole 11a in the water tank of vacuum jet pump 11 is connected with header tank 19 by pvc pipe 18, header tank 19 arranges graduated scale, by recording the collecting water from runoff at setting-up time interval, calculating is catchmented speed, and namely catchment speed=collecting water from runoff/time interval, the described time interval is 1h or 2h or 5h or 12h or 24h.
The vacuum meter 17 of sealing under-membrance vacuum degree is connected with one end of plastic flexible pipe, and the other end non-woven wraps of plastic flexible pipe, under being fixed on diaphragm seal with nylon buckles.In the exposure position of plastic draining board 12, plastic draining board 12 non-woven geotextile bar is connected with the corresponding opening part colligation of level to vacuum drainage arm 13, form vacuum preloading drainage system; Level to vacuum drainage arm 13 according to setting pitch arrangement, described setting spacing can be 0.5 or 1 or 2 or 3 or 4 or or 5 or 6 or 7 or 8 or 9 or 10m; Level is responsible for 16 to vacuum drainage arm 13 and level to vacuum drainage and is mutually arranged vertically, level is responsible for 16 with level to vacuum drainage to vacuum drainage arm 13 and is connected with tee piece, level to vacuum drainage supervisor 16 according to setting pitch arrangement, described spacing be 2 or 5 or 10 or or 15 or 20 or 25 or 30 or 35 or 40 or 45 or 50m; Level is connected to vacuum drainage supervisor 16 with vacuum jet pump 11, and vacuum jet pump 11 top is provided with spout hole 11a, is connected by spout hole 11a with pvc pipe 18 with header tank 19.
A kind of compacted method (1) of melting contracting fracturing method soft ground treatment of frost heave is being treated on stabilization by drainage weak soil, lay the medium coarse sand bed course of fineness modulus at 3.7-2.5, sand cushion thickness is 30cm ~ 50cm, in short supply or (treat that the initial bearing capacity of stabilization by drainage weak soil is 0MPa) when stabilization by drainage weak soil is ultra-soft silt soil 15 in sand source, lay one deck 150g/m
2woven cloth also overlays one deck 200g/m
2non-woven geotextile;
(2) cryovial 14 is set to enter treat in stabilization by drainage weak soil with dot matrix distribution, each cryovial 14 forms square stabilization zone, the described square stabilization zone length of side is 0.5m or 0.8m or 1m or 1.2m or 1.5m or 1.8m or 2m or 4m, and being submerged in top on cryovial 14 to treat stabilization by drainage weak soil surface certain depth, the described degree of depth is 0.5m or 0.8m or 1m or 1.2m or 1.5m or 1.8m or 2m.
(3) cryovial 14 one end is connected salt solution outlet arm 9, the other end connects brine loop arm 10, salt solution outlet arm 9 connects salt solution outlet supervisor 7, brine loop arm 10 connects brine loop supervisor 8, salt solution outlet supervisor 7 directly connects brine recycling case 5, brine loop supervisor 8 connects brine pump 6, and brine pump 6 connects brine recycling case 5, and in the case in brine recycling case 5, ammonia circulation line 5a connects ammonia compressor 4; Ammonia compressor 4 connecting column tubular circulation condenser 3, shell and tube cycle condenser 3 is connected with cooling tower 1, and cooling tower 1 is connected with cooling water pump 2, and cooling water pump 2 is connected with ammonia circulation line 5a in the case in brine recycling case 5.
(4) plastic draining board 12 in a row inserted, as depth direction drainage system, layout staggers with cryovial 14 and arranges with lattice-like, and making plastic draining board 12 upper end exposure 5-10cm on non-woven geotextile or sand cushion;
(5) according to setting pitch arrangement level to vacuum drainage arm 13, described setting spacing can be 0.5 or 1 or 2 or 3 or 4 or or 5 or 6 or 7 or 8 or 9 or 10m;
(6) according to setting pitch arrangement level to vacuum drainage supervisor 16, described spacing be 2 or 3 or 5 or or 10 or 15 or 25 or 30 or 35 or 40 or 45 or 50m;
(7) in the exposure position, upper end of plastic draining board 12, plastic draining board 12 non-woven geotextile bar is connected with the corresponding opening part colligation of level to vacuum drainage arm 16, form vacuum preloading drainage system.
(8) complete the diaphragm seal laying 2 thickness 0.12 ~ 0.16mm after above-mentioned steps (7) above square stabilization zone, and stabilization zone peripheral sealing film film is inserted treat to reach sealing function in stabilization by drainage weak soil;
(9) vacuum jet pump 11 is laid, can by every 1000m
2wait that reinforcing area lays a vacuum jet pump 11;
(10) vacuum jet pump 11 is opened, plastic draining board 12, level is made to be in negative pressure state to vacuum drainage arm 13, level to vacuum drainage supervisor 16, check that whether vacuum preloading drainage system is working properly, as normally, then carry out next step operation, as abnormal, after treating investigation fault, enter next step operation;
(11) by the vacuum meter 17 of monitoring sealing under-membrance vacuum degree, the power of adjustment jet pump 11 or quantity, under whole diaphragm seal, vacustat is at about-30 ± 5kPa, at interval of 1 ~ 2 angel whole sealing under-membrance vacuum degree be interim incremental variations 10kPa once, namely phasic Chang refers to-30kPa ,-40kPa ,-50kPa ,-60kPa ,-70kPa ,-80kPa ,-90kPa; Under finally making vacuum diaphragm, vacustat is at-90kPa;
(12) situation of change of the speed of catchmenting at certain hour interval is calculated by header tank 19, described certain hour interval can be 5h, drafting is catchmented speed and time curve, catchment speed and time curve to reach slope be 0 time, open brine pump 6, cooling water pump 2 and ammonia compressor 4, wherein, brine recycling subsystem operational mode is: will treat the Saline Absorbent in the heat cryovial 14 of stabilization by drainage weak soil, by brine pump 6, salt solution is pumped into brine loop arm and brine loop supervisor, until flow into brine recycling case 5, again the salt solution of cooling is responsible for 7 by salt solution outlet, salt solution outlet arm 9 and cryovial 14 make hypothermic saline again enter to treat to circulate in stabilization by drainage weak soil.Ammonia cycle subsystem operational mode is that the process that the heat carried by the salt solution in brine recycling case 5 becomes gaseous state by ammonia from liquid state absorbs, again ammonia ammonia compressor 4 is carried out compression and form high pressure ammonia gas, by shell and tube cycle condenser 3, high pressure ammonia gas is cooled to ammoniacal liquor, by cooling water pump 2, ammoniacal liquor is pumped into cooling tower 1 again ammoniacal liquor is lowered the temperature, finally the low temperature ammoniacal liquor of cooling tower 1 is connected the heat that brine recycling case absorbs salt solution again, enter and circulate next time.
(13) continue through header tank 19 to monitor and drafting is catchmented speed and time curve, when the slope of catchment speed and time curve is 0 again, closing brine pump 6, cooling water pump 2 and ammonia compressor 4 makes soil body generation of naturally thawing melt draw gap, after the soil body thaws completely, again open brine pump 6, cooling water pump 2 and ammonia compressor 4 behind setting-up time interval, described setting-up time is 12h or 24h or 36 or 48h.
(14) above-mentioned steps (12) (13) are repeated, until the shallow-layer in ultra-soft silt soil region and the soil moisture content of deep layer are all decreased significantly, the shear strength of the injection stress of static sounding and vane-shear test reaches designing requirement, can unload, the duration is about 20 or 26 or 31 or 35 or 40 days.
Embodiment: 3:
Be positioned at hydraulic reclamation region, lake behind new district, Chinese parasol tree lake, Ezhou, Hubei, hydraulic reclamation mean depth is about 3 ~ 6m.Recently to have moisture content high for blowing-filling sludge, and compressibilty is large, bad hydraulic permeability, the feature that initial bearing capacity is extremely low.Process front trial zone soil soil moisture content and be greater than 180%, wet density 1.42g/cm
3, liquid limit 91.3%, plastic limit 35.4%; Particle composition is greater than 0.075mm accounting 1.5%, 0.075mm ~ 0.005mm accounting 50.6%, is less than 0.005mm accounting 47.9%; This blowing-filling sludge soil, in flow regime, is ultra-soft silt soil, substantially without initial bearing capacity, needs to process, and requires that process groundwork bearing capacity is greater than 55kPa.
The compacted device melting contracting fracturing method soft ground treatment of frost heave, the steps include:
(1) treating on stabilization by drainage weak soil, laying one deck 150g/m2 woven cloth and add one deck 200g/m2 non-woven geotextile;
(2) cryovial 14 is set to enter in square treat in stabilization by drainage weak soil or ultra-soft silt soil, the described square length of side is 1m, and submerged in top on cryovial 14 to treat stabilization by drainage weak soil or the surperficial certain depth of ultra-soft silt soil 15, the described degree of depth is 1m.
(3) cryovial 14 one end is connected salt solution outlet arm 9, the other end connects brine loop arm 10, salt solution outlet arm 9 connects salt solution outlet supervisor 7, brine loop arm 10 connects brine loop supervisor 8, salt solution outlet supervisor 7 directly connects brine recycling case 5, brine loop supervisor 8 connects brine pump 6, and brine pump 6 connects brine recycling case 5, and in the case in brine recycling case 5, ammonia circulation line 5a connects ammonia compressor 4; Ammonia compressor 4 connecting column tubular circulation condenser 3, shell and tube cycle condenser 3 is connected with cooling tower 1, and cooling tower 1 is connected with cooling water pump 2, and cooling water pump 2 is connected with ammonia circulation line 5a in the case in brine recycling case 5.
(4) in a row insert plastic draining board 12 as depth direction drainage system, layout is arranged in plum blossom-shaped with cryovial 14, and makes plastic draining board 12 exposure 5-10cm on non-woven geotextile;
(5) according to setting pitch arrangement level to vacuum drainage arm 13, described setting spacing can be 1m,
(6) be responsible for 16 according to setting pitch arrangement level to vacuum drainage, described spacing is 3m;
(7) in the exposure position of plastic draining board 12, plastic draining board 12 non-woven geotextile bar is connected with the corresponding opening part colligation of level to vacuum drainage arm 16, form vacuum preloading drainage system.
(8) complete the diaphragm seal laying 2 thickness 0.16mm after above-mentioned steps (7) above square stabilization zone, and stabilization zone peripheral sealing film is inserted treat to reach sealing function in stabilization by drainage weak soil;
(9) by every 1000m
2a vacuum jet pump 11 is laid in stabilization zone to square;
(10) vacuum jet pump 11 is opened, multiple plastic draining board 12, level is made to be in negative pressure state to vacuum drainage arm 13, level to vacuum drainage supervisor 16, check that whether vacuum preloading drainage system is working properly, as normally, then carry out next step operation, as abnormal, after treating investigation fault, enter next step operation;
(11) by the vacuum meter 17 of sealing under-membrance vacuum degree, the power of adjustment jet pump 11, under whole vacuum diaphragm, vacustat is about-30kPa, stepwise varying at interval of 2 angel's vacuums, described phasic Chang refers to-30kPa ,-40kPa ,-50kPa ,-60kPa ,-70kPa ,-80kPa ,-90kPa; It is 2d that described vacuum opens the duration; Under finally making vacuum diaphragm, vacustat is at-90kPa;
(12) situation of change of the speed of catchmenting at certain hour interval is calculated by header tank 19, described certain hour is spaced apart 5h, drafting is catchmented speed and time curve, catchment speed and time curve reach slope close to 0 time, open frost heave system, brine recycling subsystem operational mode in frost heave system is: will treat the Saline Absorbent in the heat cryovial 14 of the stabilization by drainage weak soil soil body, by brine pump 6, salt solution is pumped into brine loop arm 11 and brine loop supervisor 8 again, until brine recycling case 5, again the salt solution of cooling is responsible for 7 by salt solution outlet, salt solution outlet arm 9 and cryovial 14 make hypothermic saline again enter to treat to circulate in the stabilization by drainage weak soil soil body.Ammonia cycle subsystem operational mode in frost heave system is: the process that the heat carried by the salt solution in brine recycling case 5 becomes gaseous state by ammonia from liquid state absorbs, again ammonia ammonia compressor 4 is carried out compression and form high pressure ammonia gas, by shell and tube cycle condenser 3, high pressure ammonia gas is cooled to ammoniacal liquor, by cooling water pump 2, ammoniacal liquor is pumped into cooling tower 1 again ammoniacal liquor is lowered the temperature, finally the low temperature ammoniacal liquor of cooling tower 1 is connected the heat that brine recycling case 5 absorbs salt solution again, enter and circulate next time.
(13) continue through header tank 19 to monitor and drafting is catchmented speed and time curve, wait catchment speed and time curve slope again close to 0 time, closing frost heave system makes soil body generation of naturally thawing melt draw gap, after the soil body thaws 48h, again open frost heave system.
(14) above-mentioned steps (12) (13) are repeated, until treat that (shallow-layer refers to crust layer for the shallow-layer of stabilization by drainage weak soil and deep layer, the degree of depth is less than 2m, deep layer refers generally to be greater than 2m) soil moisture content be all decreased significantly, the shear strength achievement of the injection stress of static sounding and vane-shear test reaches designing requirement, can unload, the duration is about 40 days.
The method that contracting fracturing method accelerates soft soil consolidation is melted according to above-mentioned frost heave is compacted, working time is 40 days, and stabilization by drainage bearing capacity under soft foundation is treated in detection, treat that the shallow-layer bearing capacity of stabilization by drainage weak soil reaches 80kPa, and 4-10m treats that the bearing capacity (converting through vane-shear and static sounding) of stabilization by drainage weak soil reaches 60-85kPa all, reaches the processing target of expection.
Through preresearch estimates, the present embodiment operating expenses is the 55%-75% of conventional vacuum precompressed, and the construction period can reduce 40%-60%, energy consumption reduces 20%-40%, once reinforce and can process deep layer weak soil, shallow-layer and and deep foundation bearing capacity on average reach about 60-80kPa, reach the object accelerating fine grained weak soil soil solidifying, have simultaneously basement process evenly, easy construction, load time be short, the clear superiority of economy.
Specific embodiment described herein is only to the explanation for example of the utility model spirit.The utility model person of ordinary skill in the field can make various amendment or supplements or adopt similar mode to substitute to described specific embodiment, but can't depart from spirit of the present utility model or surmount the scope that appended claims defines.
Claims (5)
1. the compacted device melting contracting fracturing method soft ground treatment of frost heave, comprise dot matrix distribution and be embedded in the cryovial (14) treated in stabilization by drainage weak soil, it is characterized in that, also comprise dot matrix distribution and be embedded in the plastic draining board (12) treated in stabilization by drainage weak soil, cryovial (14) and plastic draining board (12) are in staggered distribution, plastic draining board (12) is communicated with header tank (19) by vacuum jet pump (11), cryovial (14) one end is communicated with brine recycling case (5), the other end is communicated with brine recycling case (5) by brine pump (6), brine recycling case (5) is connected with brine-cooled device.
2. the compacted device melting contracting fracturing method soft ground treatment of a kind of frost heave according to claim 1, it is characterized in that, described brine-cooled device comprises ammonia circulation line (5a) in the case that is arranged in brine recycling case (5), in case, ammonia circulation line (5a) one end is connected with shell and tube cycle condenser (3) by ammonia compressor (4), shell and tube cycle condenser (3) is connected with cooling tower (1), and cooling tower (1) is connected with ammonia circulation line (5a) other end in case by cooling water pump (2).
3. the compacted device melting contracting fracturing method soft ground treatment of a kind of frost heave according to claim 2, it is characterized in that, also comprise and be all responsible for (16) according to the level of setting pitch arrangement to vacuum drainage arm (13) and vacuum drainage, the top of plastic draining board (12) is connected with vacuum drainage arm (13), vacuum drainage supervisor (16) is connected with vacuum jet pump (11), and vacuum jet pump (11) is connected with header tank (19).
4. the compacted device melting contracting fracturing method soft ground treatment of a kind of frost heave according to claim 3, it is characterized in that, described cryovial (14) one end is connected with salt solution outlet arm (9), the other end is connected with brine loop arm (10), salt solution outlet arm (9) connects salt solution outlet supervisor (7), brine loop arm (10) connects brine loop supervisor (8), salt solution outlet supervisor (7) connects brine recycling case (5), brine loop supervisor (8) connects brine recycling case (5) by brine pump (6).
5. the compacted device melting contracting fracturing method soft ground treatment of a kind of frost heave according to claim 4, it is characterized in that, described cryovial (14) forms stabilization zone, and stabilization zone covers diaphragm seal, and the diaphragm seal of stabilization zone periphery is placed in treats stabilization by drainage weak soil.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520667898.8U CN204940244U (en) | 2015-08-30 | 2015-08-30 | The compacted device melting contracting fracturing method soft ground treatment of a kind of frost heave |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520667898.8U CN204940244U (en) | 2015-08-30 | 2015-08-30 | The compacted device melting contracting fracturing method soft ground treatment of a kind of frost heave |
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| CN204940244U true CN204940244U (en) | 2016-01-06 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110820786A (en) * | 2019-11-19 | 2020-02-21 | 青海省交通科学研究院 | Deep foundation structure for preventing freeze-thaw diseases in permafrost region |
| CN113605362A (en) * | 2021-08-21 | 2021-11-05 | 中铁一局集团(广州)建设工程有限公司 | Micro-splitting multi-layer high-vacuum layering pre-compaction construction method |
-
2015
- 2015-08-30 CN CN201520667898.8U patent/CN204940244U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110820786A (en) * | 2019-11-19 | 2020-02-21 | 青海省交通科学研究院 | Deep foundation structure for preventing freeze-thaw diseases in permafrost region |
| CN110820786B (en) * | 2019-11-19 | 2021-04-23 | 青海大学 | Deep foundation structure for preventing freeze-thaw diseases in permafrost region |
| CN113605362A (en) * | 2021-08-21 | 2021-11-05 | 中铁一局集团(广州)建设工程有限公司 | Micro-splitting multi-layer high-vacuum layering pre-compaction construction method |
| CN113605362B (en) * | 2021-08-21 | 2022-07-08 | 中铁一局集团(广州)建设工程有限公司 | Micro-splitting multi-layer high-vacuum layering pre-compaction construction method |
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