CN104895087A - Chemical powder soil texture deep foundation pit construction method - Google Patents
Chemical powder soil texture deep foundation pit construction method Download PDFInfo
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- CN104895087A CN104895087A CN201510320388.8A CN201510320388A CN104895087A CN 104895087 A CN104895087 A CN 104895087A CN 201510320388 A CN201510320388 A CN 201510320388A CN 104895087 A CN104895087 A CN 104895087A
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Abstract
The invention discloses a chemical powder soil texture deep foundation pit construction method. The chemical powder soil texture deep foundation pit construction method includes: a) leaving a side slope and performing support treatment on the side slope; b) constructing a vehicle transport corridor; c) processing underground water and rainwater. The chemical powder soil texture deep foundation pit construction method guarantees underground structure construction and safety of surroundings around a foundation pit, effectively guarantees chemical powder soil texture deep foundation pit construction quality by adopting support, reinforcement and protection measures on the side wall of the foundation pit and the surroundings around the foundation pit, prevents collapse, and thereby guarantees safety of constructors and construction machinery.
Description
Technical field
The invention belongs to Construction Techniques for Deep Foundation Pit field, particularly a kind of chemical industry silt geology construction method of deep foundation ditch.
Background technology
Along with the maximization of product device, the high stratification of building, embedded depth of foundation increases thereupon, and therefore, deep foundation pit construction is often met in engineering construction at present.For the deep foundation ditch operation under silt geological conditions at the northern area of China ubiquity, because silt soil property is weak, poor stability, groundwater table is higher, excavation slope in deep foundation pit earthwork digging process is stablized, underground water pump drainage, construction machinery safety work must take effective technical measures, to guarantee the safety of constructor and construction machinery.
Summary of the invention
The object of the invention is to: for above-mentioned Problems existing, a kind of construction method that effectively can ensure chemical industry silt geology deep foundation pit construction quality is provided.
Technical scheme of the present invention is achieved in that a kind of chemical industry silt geology construction method of deep foundation ditch, it is characterized in that: comprise following methods:
A) slope and slope retaining process, is put: report and digging in-situ test pit actual investigation soil property and aquifer distribution situation are surveyed in base area, pit earthwork adopts layering heavy excavation, be divided into three layers to excavate, first floor cutting depth controls within 2.0m, carries out first floor side slope whitewashing cure process and drainage sunk well after first floor has excavated; Second layer cutting depth controls at 4.0m ~ 4.5m, carries out second layer side slope whitewashing cure process and drainage sunk well after the second layer has excavated; Third layer is excavated to design substrate more than absolute altitude 0.2m, and third layer carries out third layer side slope whitewashing cure process and drainage sunk well after having excavated, be provided with step plane, carry out whitewashing cure process to step plane in described foundation ditch between adjacent two layers side slope;
B), vehicle transport passage is built: when the excavation second layer, the third layer earthwork, build a transport ramp and lead to foundation ditch, described transport ramp declines with the excavation of foundation pit degree of depth and reduces, final consistent with bottom foundation ditch, the gradient≤12 ° in described transport ramp, the soil property employing cobble that described ramp is corresponding and Gobi desert soil carry out changing filling out;
C), underground water and rainwater treatment: while side slope and step plane carry out whitewashing cure process, aqueduct is anchored in side slope, part on described aqueduct, in insertion side slope is provided with some drain holes, described step plane keeps at a certain distance away and is provided with sump, described sump is interconnected by the gutter be arranged on step plane, and the underground water of derivation and surface rain come together in sump by gutter and adopt foul water pump to concentrate discharge by pipeline.
Chemical industry silt geology construction method of deep foundation ditch of the present invention, its above-mentioned construction method a) in, described whitewashing cure process is specially: first in the side slope and each step plane of first, second and third layer, lay supporting mesh sheet, then spray operation is carried out, the thick cement paste dado of 30mm ~ 50mm is formed in the side slope of foundation ditch and step plane, described spray operation synchronously carries out with soil excavation operation, namely carry out after every one deck soil excavation completes, or unification is carried out after whole excavation of foundation pit completes.
Chemical industry silt geology construction method of deep foundation ditch of the present invention, it is in the supporting process of described side slope, supporting and protection structure is respectively arranged with in the bottom of second layer side slope and third layer side slope, described supporting and protection structure comprises horizontally disposed channel-section steel and some piling bar vertically arranged with channel-section steel, described some piling bar upper ends are fixedly connected with channel-section steel respectively, bottom the side slope of its lower end edge foundation ditch in injection soil layer, bottom described side slope, the space place that formed between piling bar and side slope is provided with some sand bags.
Chemical industry silt geology construction method of deep foundation ditch of the present invention, piling bar described in it by bottom side slope with step plane junction injection soil layer, described some piling bars are equidistantly evenly arranged along channel-section steel length direction, described piling bar bottom is vertically inserted in soil layer, the above certain altitude of step plane of foundation ditch is exposed on its top, and the height that described some sand bags are piled up exposes the height of the step plane of foundation ditch higher than piling bar.
Chemical industry silt geology construction method of deep foundation ditch of the present invention, it is at above-mentioned construction method b) in, after the first floor earthwork and ramp have been excavated, if carriage way or Local topography soil property poor, when construction machinery cannot enter and carry out operation, carry out local and change guanovulite and Gobi desert soil, changing and filling out the degree of depth is 500mm, wherein bottom is the thick cobble of 300mm, and surface layer is 200mm thick Gobi desert soil; After the second layer earthwork and ramp have been excavated, when excavating the third layer earthwork, need change foundation ditch and turnover foundation ditch ramp soil property and fill out, changing and filling out the degree of depth is 800mm, and wherein bottom is the thick cobble of 500mm, and surface layer is 300mm thick Gobi desert soil.
By construction method of the present invention; ensure that the safety of Underground Construction and foundation ditch surrounding enviroment; the supporting adopted foundation pit side-wall and surrounding enviroment, reinforcing and safeguard measure effectively ensure that the quality of chemical industry silt geology deep foundation pit construction; prevent from caving in, thus ensure that the safety of constructor and construction machinery.
Accompanying drawing explanation
Fig. 1 is underground water and rainwater treatment scheme schematic diagram in work progress of the present invention.
Fig. 2 is slope retaining processing scheme schematic diagram in work progress of the present invention.
Fig. 3 is the schematic diagram of aqueduct in underground water of the present invention and rainwater treatment.
Fig. 4 is the schematic diagram of supporting and protection structure in supporting process of the present invention.
Mark in figure: 1 is foundation ditch, and 2 is step plane, 3 is supporting mesh sheet, and 4 is cement paste dado, and 5 is aqueduct, and 6 is drain hole, and 7 is sump, and 8 is gutter, and 9 is channel-section steel, and 10 is piling bar, and 11 is sand bag.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is described in detail.
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
A kind of chemical industry silt geology construction method of deep foundation ditch, comprises following methods:
A) slope and slope retaining process, is put: report and digging in-situ test pit actual investigation soil property and aquifer distribution situation are surveyed in base area, pit earthwork adopts layering heavy excavation, be divided into three layers to excavate, first floor cutting depth controls within 2.0m, this layer of soil property is better, bearing capacity of foundation slab fak=110kpa, construction machinery can be born by taking certain soil property replacement Treatment measure and haulage vehicle turnover is current, carrying out first floor side slope after first floor excavate and to whitewash cure process and drainage sunk well; Second layer cutting depth controls at 4.0m ~ 4.5m, carries out second layer side slope whitewashing cure process and drainage sunk well after the second layer has excavated; Third layer is excavated to design substrate more than absolute altitude 0.2m, third layer carries out third layer side slope whitewashing cure process and drainage sunk well after having excavated, step plane is provided with between adjacent two layers side slope in described foundation ditch, whitewashing cure process is carried out to step plane, labor cleaning's layer is reserved in substrate, because foundation ditch is darker, the degree of depth reaches more than 9 meters, and construction period is longer, for guaranteeing safety, avoid excavation slope to cave in and rain drop erosion is caved in, excavation of foundation pit is taked to put slope heavy excavation, and excavation slope presses 1:1 natural discharging slope.
Above-mentioned construction method a) in, described whitewashing cure process is specially: first in the side slope and each step plane of first, second and third layer, lay supporting mesh sheet 3, be the expanded metal lath of 5mm if δ is the steel fabric sheet of 5mm or δ, then spray operation is carried out, the thick cement paste dado of 30mm ~ 50mm 4 is formed in the side slope of foundation ditch 1 and step plane 2, described spray operation synchronously carries out with soil excavation operation, namely carry out after every one deck soil excavation completes, or unification is carried out after whole excavation of foundation pit completes.
As shown in Figures 2 and 4, in the supporting process of described side slope, supporting and protection structure is respectively arranged with in the bottom of second layer side slope and third layer side slope, described supporting and protection structure comprises horizontally disposed channel-section steel 9 and some piling bar 10 vertically arranged with channel-section steel 9, described some piling bars 10 upper end is fixedly connected with channel-section steel 9 respectively, bottom the side slope of its lower end edge foundation ditch in injection soil layer, the space place formed bottom described side slope, between piling bar 10 and side slope is provided with some sand bags 11, prevents slope failure and the partial collapse because of soil property saturated yielding.
Wherein, described piling bar 10 by bottom side slope with step plane 2 junction injection soil layer, described some piling bars 10 are equidistantly evenly arranged along channel-section steel 9 length direction, described piling bar 10 bottom is vertically inserted in soil layer, step plane more than 2 certain altitude of foundation ditch 1 is exposed on its top, and the height that described some sand bags 11 are piled up exposes the height of the step plane 2 of foundation ditch 1 higher than piling bar 10.
B), vehicle transport passage is built: when the excavation second layer, the third layer earthwork, build a transport ramp and lead to foundation ditch, described transport ramp declines with the excavation of foundation pit degree of depth and reduces, final consistent with bottom foundation ditch, the gradient≤12 ° in described transport ramp, the soil property employing cobble that described ramp is corresponding and Gobi desert soil carry out changing filling out.
At above-mentioned construction method b) in, after the first floor earthwork and ramp have been excavated, if carriage way or Local topography soil property poor, when construction machinery cannot enter and carry out operation, carry out local and change guanovulite and Gobi desert soil, changing and filling out the degree of depth is 500mm, and wherein bottom is the thick cobble of 300mm, and surface layer is 200mm thick Gobi desert soil; After the second layer earthwork and ramp have been excavated, when excavating the third layer earthwork, need change foundation ditch and turnover foundation ditch ramp soil property and fill out, changing and filling out the degree of depth is 800mm, and wherein bottom is the thick cobble of 500mm, and surface layer is 300mm thick Gobi desert soil.
C), underground water and rainwater treatment: while side slope and step plane carry out whitewashing cure process, aqueduct 5 is anchored in side slope, on described aqueduct 5, the part inserted in side slope is provided with some drain holes 6, as shown in Figure 3, described some drain holes 6 are along the axial interlaced arrangement of aqueduct 5, described step plane keeps at a certain distance away and is provided with sump 7, described sump 7 is interconnected by the gutter 8 be arranged on step plane 2, cement paste dado 4 is formed at described sump 7 inwall and the whitewashing of the end, hole, the underground water of deriving and surface rain come together in sump by gutter and adopt foul water pump to concentrate discharge by pipeline.
In the present embodiment, its Specific construction step is:
1, surveying setting-out: according to design drawing coordinate and device region measurement allocation control points outcome table, carry out axis projection with total powerstation and transit, perform axial line control stake.Undertaken putting slope and guaranteeing that excavation slope is stable carrying out work plane (1 meter, 4 meters) needed for whitewashing process (bottom piling bar protection side slope), drainage sunk well by 1:1 sloping coefficient, calculate excavating sideline.First release first floor soil excavation line and vehicle transport ramp, Road, and to rule good mark with lime.One deck excavated carry out Slope Treatment and drainage sunk well, ramp and constructing road, soil property release lower one deck again through control point excavation line after changing and filling out, and strictly control substrate absolute altitude cutting depth and planeness well.
2, pit earthwork excavation:
1), excavator and earth moving vehicles are selected: according to construction period, soil excavation estimates that the duration is 40 days, earthwork excavated volume very large (160,000 cubes), consider that bank protection, draining, foundation ditch soil property are changed and filled out impact, the actual excavation duration only has about 30 days, average every day excavates operation earth volume and is approximately 5300 ~ 5500 cubes, select 1 cube of excavator from east, both sides, west with layered retreat excavation, adopt two classes and carry out operation.
Excavator requirement: N=Q/P*1/T*C*K (Q=160000 m3, T=30 days, C=2, K get 0.8)
Excavator productivity ratio: P=8*3600/t*q*Kc/Ks*KB (Ks get 1.15, Kc get 0.9, KB get 0.8, t(100 type excavator) gets 40s, q=1 m
3)
P=8*3600/40*0.9/1.15*0.8=450.8m3/ machine-team=451 m
3/ machine-team
Then required excavator quantity: N=160000/451*1/30*2*0.8=7.4 platform, gets 8.
Earth moving vehicles: (selecting 5T dump truck to load and transport the earthwork)
N1=T1/t1
Per car fills native number of times:
N=Q1(muck haulage vehicle load) * q(dipper capacity) * Kc/Ks*r=5*1*0.9/1.15*1.7(soil unit weight)=6.65(gets 7 times)
Each loading time: t1=nt=7*40=280s=4.7min(gets 5min)
Each working cycles of earth moving vehicles perdurabgility:
T1=t1+2L(haul distance)/Vc(the speed of a motor vehicle, get 15km/h)+t2(unload soil the time, get 1min)+t3(handle the time get 3min)=5+2*1*60/15+1+3=17min
Then every platform excavator configuration earth moving vehicles quantity:
N1=T1/t1=17/5=3.4(gets 4)
8 excavators need configure earth moving vehicles altogether: 4*8=32().
2), pit earthwork excavation: select 8 1m
3reverse shovel grab, is placed in each 4 of east, west both direction respectively, carries out soil excavation simultaneously.4 excavators retreat from east to west and excavate in the east, and 4, west retreats from west to east and excavates.Soil excavation adopts stage excavation, and along excavation line during first floor soil excavation, put slope according to 1:1 and require to excavate, and revise side slope, for slope retaining and drainage requirement create conditions, the first floor soil excavation degree of depth is 2.0m.
After first floor soil has excavated (cutting depth is within nature below ground 2m), survey report display, this layer of soil property is better, bearing capacity of foundation slab fak=110kpa, construction machinery can be born and haulage vehicle turnover current (if passing road and Local topography soil property weak, can carry out passing road and local soil property change guanovulite and Gobi desert soil, the thick cobble of replacement thickness 500mm:300mm, 200mm thick Gobi desert soil), guarantee construction machinery, haulage vehicle enters foundation ditch normal operation, be unlikely to impassable because of the weak depression of soil property.After ramp finishing that first floor (dark 2m) excavates and vehicles while passing foundation ditch passes through terminates, carry out second layer soil excavation surveying setting-out, releasing excavation line and 1:1 put slope line and reserved 1m(water-pumping/draining needs) stepped line, construction machinery, earth moving vehicles enters foundation ditch, start to carry out the operation of second layer soil excavation and carry out ramp (turnover foundation ditch) excavation to change and fill out finishing along first floor soil excavation line direction (according to the excavation method of first floor soil), report display is surveyed in base area, in the second layer soil excavation degree of depth, soil property belongs to 2. layer silt, and be positioned at pervious layer, soil property is poor, ~ liquid-plastic state is moulded in soft, this one deck soil excavation degree of depth is that 4.0m ~ 4.5m(looks the decision of soil property situation).Operation is carried out for construction machinery and haulage vehicle when guaranteeing third layer soil excavation can normally enter in foundation ditch, after the second layer earthwork and ramp have been excavated, need change foundation ditch and turnover foundation ditch ramp soil property and fill out, when guaranteeing third layer soil excavation, construction machinery and earth moving vehicles can pass through smoothly, change and fill out the thick cobble of 0.8m and Gobi desert material.Change work of filling out to change together fill out in company with foundation ditch ramp, advanced inwards by direction, ramp, more respectively eastwards, western both direction carries out simultaneously.
After excavation of foundation pit and ramp soil property are changed and are filled out end-of-job, carry out third layer soil excavation surveying setting-out, releasing excavation line and side slope put slope line, carry out third layer soil excavation according to said method, third layer soil excavation is excavated to absolute altitude at the bottom of design foundation ditch always, for avoiding foundation bed by disturbance, reserved 200mm thick soil stratum adopts labor cleaning, smooth, until meet design, survey requirement, inspect for acceptance qualified after carry out immediately bed course close, so far soil excavation end-of-job.
3), foundation pit stope support: the excavation of foundation pit degree of depth is 9.25m, and excavation area is large, belong to deep foundation ditch large area job engineering, for stability of slope, prevent from caving in and be even more important, report display is surveyed in base area, foundation ditch soil property is silt, 2. the end, hole is positioned at the, 3. between layer silt, 2. layer silt be that aquifer (aquitard) soil property is poor, ~ liquid-plastic state is moulded in soft, stability of slope is even more important, according to owner's construction period in conjunction with job site concrete condition, soil excavation operation adopts layering (being divided into three layers) to carry out, stepped in three layers, side slope is undertaken putting slope by 1:1 sloping coefficient, and to side slope, side slope lower step plane (work plane) 1m, within the scope of 4m and turnover foundation ditch ramp (passage) both sides side slope topsoil matter carries out (cement paste) cure process (interior extension δ=5mm gauze wire cloth or δ=5mm steel plate net) of whitewashing, three layers of soil-slope and 1m, 4m step plane (work plane), enter ramp (passage) both sides that foundation ditch carries out operation and all carry out whitewashing cure process, to prevent slope failure and surface water, rain drop erosion and caving in, landslide, guarantee safety.For the second layer, the third layer earthwork, according to stability of slope needs, bottom side slope, make piling bar with step junction carry out stability of slope support, piling bar adopts channel-section steel to make, long 2.5m, with weight injection soil layer at the bottom of every one deck slope, piling bar exposes domatic 200mm, connects in aggregates with channel-section steel by bolt (or welding), and bottom side slope inside piling bar, pressurization sand bag, prevents slope failure and the partial collapse because of soil property saturated yielding.
Whitewashing cure process: excavator excavation pit every one deck soil after side slope is repaired by 1:1 sloping coefficient, immediately to side slope and step plane 1m, whitewashing cure process is carried out within the scope of 4m, 6m ~ 9m length blanking δ=5mm steel fabric sheet (or δ=5mm steel plate net) is pressed according to side slope width in advance at foundation ditch end face, excavator excavation certain length after trimming side slope, steel fabric sheet (or steel plate mesh sheet) is layed on side slope and step plane, carry out spray operation, shotcrete thickness 30mm ~ 50mm, spray operation synchronously carries out (if the license of side slope soil condition with soil excavation operation, can carry out or the license of excavation slope soil condition after every one deck soil has excavated, after whole excavation of foundation pit completes, unification is carried out).
4), foundation ditch underground water and surface rain process: report display is surveyed in base area, pit earthwork is excavated to underground about 4.30m for aquifer (the 2. powder soil horizon), aquifer is aquitard, water content is little, permeability poor (transmission coefficient 0.1 ~ 0.5m/d), slope underground water adopts injection aqueduct to derive draining, specific practice: side slope and step plane (1m, within the scope of 4m) carry out cure process simultaneously, aqueduct is squeezed in side slope, aqueduct adopts ￠ 75 steel pipe manufacturing, length L=3m, along aqueduct length direction boring ￠ 10, be crisscross arranged boring, aqueduct squeezes into side slope along side slope inclined-plane low dip in step surface, every one deck side slope arranges two row's aqueducts, expose 500 ~ 800mm(and be convenient to draining), at 1m, 4m pace plane is excavated out gutter 200*200mm(concrete ditch, concrete furrow bank and bottom of trench are whitewashed shaping simultaneously when whitewashing bank protection operation) and sump 1000*1000*800(dark) mm(concrete sump, concrete hole wall and the end, hole, whitewash shaping when whitewashing bank protection operation), gutter and sump are along the through setting of foundation ditch every one deck step, sump arranges one every 50m, the underground water of deriving and surface rain come together in sump by gutter and adopt foul water pump to concentrate discharge by pipeline.
5), foundation ditch perimeter security is safeguarded: 3m outside excavation of foundation pit sideline, elongated layout safety scaffold steel pipe railing (is coated with security warning look red and white, height 1.2m, vertical rod, if three road horizontal cross bars) close, and make distinct alert label, adopt color lamp protective lighting night, and (from hole limit 5m) every 30 meters arranges high 4m lamp bracket around foundation ditch, lamp bracket is equipped with the illuminating lamp of 500W, the illumination to carry on construction work at night, and 16 safety flares are set along lead the way (ramp), facilitate night work personnel and machine security turnover, constructor and facility pass in and out from ramp.About two personal security aisle are respectively set up along both sides, north and south, side slope direction (with scaffold building around foundation ditch, wide 900mm, high 1.2m, the two guardrail in both sides, step adopts wooden antiskid plate, wide by 250, and ladder step is high by 180, the red white safety colour of both sides guardrail brush), convenient working personnel carry out water pumping and drainage of foundation pit and the monitoring of excavation slope stability state up and down.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1. a chemical industry silt geology construction method of deep foundation ditch, is characterized in that: comprise following methods:
A) slope and slope retaining process, is put: report and digging in-situ test pit actual investigation soil property and aquifer distribution situation are surveyed in base area, pit earthwork adopts layering heavy excavation, be divided into three layers to excavate, first floor cutting depth controls within 2.0m, carries out first floor side slope whitewashing cure process and drainage sunk well after first floor has excavated; Second layer cutting depth controls at 4.0m ~ 4.5m, carries out second layer side slope whitewashing cure process and drainage sunk well after the second layer has excavated; Third layer is excavated to design substrate more than absolute altitude 0.2m, and third layer carries out third layer side slope whitewashing cure process and drainage sunk well after having excavated, be provided with step plane, carry out whitewashing cure process to step plane in described foundation ditch between adjacent two layers side slope;
B), vehicle transport passage is built: when the excavation second layer, the third layer earthwork, build a transport ramp and lead to foundation ditch, described transport ramp declines with the excavation of foundation pit degree of depth and reduces, final consistent with bottom foundation ditch, the gradient≤12 ° in described transport ramp, the soil property employing cobble that described ramp is corresponding and Gobi desert soil carry out changing filling out;
C), underground water and rainwater treatment: while side slope and step plane carry out whitewashing cure process, aqueduct is anchored in side slope, part on described aqueduct, in insertion side slope is provided with some drain holes, described step plane keeps at a certain distance away and is provided with sump, described sump is interconnected by the gutter be arranged on step plane, and the underground water of derivation and surface rain come together in sump by gutter and adopt foul water pump to concentrate discharge by pipeline.
2. chemical industry silt geology construction method of deep foundation ditch according to claim 1, it is characterized in that: above-mentioned construction method a) in, described whitewashing cure process is specially: first in the side slope and each step plane of first, second and third layer, lay supporting mesh sheet, then spray operation is carried out, the thick cement paste dado of 30mm ~ 50mm is formed in the side slope of foundation ditch and step plane, described spray operation synchronously carries out with soil excavation operation, namely carry out after every one deck soil excavation completes, or unification is carried out after whole excavation of foundation pit completes.
3. chemical industry silt geology construction method of deep foundation ditch according to claim 2, it is characterized in that: in the supporting process of described side slope, supporting and protection structure is respectively arranged with in the bottom of second layer side slope and third layer side slope, described supporting and protection structure comprises horizontally disposed channel-section steel and some piling bar vertically arranged with channel-section steel, described some piling bar upper ends are fixedly connected with channel-section steel respectively, bottom the side slope of its lower end edge foundation ditch in injection soil layer, bottom described side slope, the space place that formed between piling bar and side slope is provided with some sand bags.
4. chemical industry silt geology construction method of deep foundation ditch according to claim 3, it is characterized in that: described piling bar by bottom side slope with step plane junction injection soil layer, described some piling bars are equidistantly evenly arranged along channel-section steel length direction, described piling bar bottom is vertically inserted in soil layer, the above certain altitude of step plane of foundation ditch is exposed on its top, and the height that described some sand bags are piled up exposes the height of the step plane of foundation ditch higher than piling bar.
5. chemical industry silt geology construction method of deep foundation ditch as claimed in any of claims 1 to 4, it is characterized in that: at above-mentioned construction method b) in, after the first floor earthwork and ramp have been excavated, if carriage way or Local topography soil property poor, when construction machinery cannot enter and carry out operation, carry out local and change guanovulite and Gobi desert soil, changing and filling out the degree of depth is 500mm, wherein bottom is the thick cobble of 300mm, and surface layer is 200mm thick Gobi desert soil; After the second layer earthwork and ramp have been excavated, when excavating the third layer earthwork, need change foundation ditch and turnover foundation ditch ramp soil property and fill out, changing and filling out the degree of depth is 800mm, and wherein bottom is the thick cobble of 500mm, and surface layer is 300mm thick Gobi desert soil.
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| CN106812528B (en) * | 2016-12-19 | 2019-11-15 | 中国神华能源股份有限公司 | The method of slope controlling stability |
| CN108755697A (en) * | 2018-06-19 | 2018-11-06 | 江苏东珠景观股份有限公司 | Long and narrow deep foundation pit earthwork digging method under a kind of rainy weather |
| CN110219304A (en) * | 2019-06-27 | 2019-09-10 | 云南建投第十二建设有限公司 | Foundation ditch excavation method for soft modeling soil |
| CN110219304B (en) * | 2019-06-27 | 2021-04-06 | 云南建投第十二建设有限公司 | Foundation pit excavation method for soft plastic land |
| CN115198777A (en) * | 2022-07-25 | 2022-10-18 | 中铁七局集团有限公司 | Dewatering method for water-rich sand layer pump room |
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