CN102116019A - Method for rapidly treating soft foundation through high vacuum densification - Google Patents
Method for rapidly treating soft foundation through high vacuum densification Download PDFInfo
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- CN102116019A CN102116019A CN200910248052XA CN200910248052A CN102116019A CN 102116019 A CN102116019 A CN 102116019A CN 200910248052X A CN200910248052X A CN 200910248052XA CN 200910248052 A CN200910248052 A CN 200910248052A CN 102116019 A CN102116019 A CN 102116019A
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- vacuum
- draining board
- plastic draining
- flexible pipe
- well point
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- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention provides a method for rapidly treating soft foundation through high vacuum densification. The method comprises the following steps: 1. respectively inserting a plastic drainage board and a vacuum well point tube into the soft foundation needing to be treated, wherein the plastic drainage board is covered by a geotextile; the upper end of the plastic drainage board is sealed by a cover; the cover is provided with a connector for connecting the cover with a hose and is connected to a vacuum-pumping system via the hose; and the vacuum well point tube is connected to the vacuum-pumping system via the hose; 2. covering the connector connecting the hose with the cover at the upper end of the plastic drainage board with clay to ensure the connector to be dense and air tight; and 3. starting the vacuum-pumping system to carry out cross densification construction combining variable energy dynamic compaction and vacuum pumping several times. The method provided by the invention has the advantages of further shortening of the construction period, saving of the construction cost, controllable quality, environment-friendliness and the like. By using the method provided by the invention, the moisture content of the soft soil can be rapidly reduced, the construction quality of the engineering can be ensured and the construction period can be shortened.
Description
Technical field
The invention belongs to Soft Ground engineering field, specifically, relate to a kind of improved quick ' high-vacuum densification ' soft foundation processing method.
Background technology
Saturated soft soil is because poor permeability, water content height, bearing capacity are low, therefore, all is a global difficult problem for the consolidation process of soft foundation all the time.
Existing " standard " thinks that saturated soft soil should not ram by force, and reason is that disturbance easily produces " spring soil ", causes that the bearing capacity of soft foundation reduces on the contrary after the disturbance.
Therefore, the domestic and international at present consolidation process for saturated soft soil mainly contains following several method:
1, broken stone pile method: technology maturation, bearing capacity height, easy construction; But there are the shortcomings such as stone, not environmental protection of to cut into a mountain in a large number;
2, cement mixing pile method: technology maturation, applicability is strong; But there is contaminated environment, the difficult control of quality, shortcomings such as cost height;
3, vacuum method: technology maturation, it is dark to handle the degree of depth, the construction environmental protection; But exist long in time limit, cost height, shortcoming such as bearing capacity is low;
4, preloading: technology maturation, it is dark to handle the degree of depth; But exist to need a large amount of cubic metres of earth and stone of transportation, resource difficulty, cost height, shortcoming such as long in time limit;
5, vacuum combined stack-load method: technology maturation, it is dark to handle the degree of depth, handles back bearing capacity height, and settlement after construction is little, but exists the duration longer, the more high shortcoming of cost;
6, High vacuum compacting method (Chinese invention patent number 01127046.2): this is a Soft Ground new technology in recent years, and development is both at home and abroad promoted very fast, and cost is extremely low, and is quality controlled, the construction environmental protection, and the duration is quick; But exist to handle depth as shallow, to shortcomings such as the weak soil quality control difficulty of hyposmosis parameter are big;
Advantages such as 7, plastic draining board+dynamic compaction: this is one of development in recent years new technology of getting up, and it is short to have a construction period, and cost is low, but exist at the difficult control of saturated soft soil quality, shortcoming such as the technical indicator improvement value is low.
Therefore, be necessary to seek and a kind ofly more save the duration, save cost, the method for quality controllable and environmental protection is to overcome the defective that exists in the said method.
Summary of the invention
The objective of the invention is to, a kind of quick ' high-vacuum densification ' soft foundation processing method is provided, thereby overcome the defective of above-mentioned conventional method.
Quick ' high-vacuum densification ' soft foundation processing method provided by the invention may further comprise the steps:
The first step: plastic draining board and vacuum well point pipe are inserted respectively in the subgrade that needs to handle, wherein, described plastic draining board uses the geotextiles parcel, the upper end closed with covers, described lid is provided with and is used to connect the interface of flexible pipe and is connected to pumped vacuum systems by flexible pipe, and described vacuum well point pipe is connected to pumped vacuum systems by flexible pipe;
Second step: cover the interface that flexible pipe is connected with the lid of plastic draining board upper end with clay, so that interface is closely knit air tight;
The 3rd step: start pumped vacuum systems, carry out several intersections that vacuumize all over the combination of change energy forced ramming and hit close construction.
According to a preferred embodiment of the present invention, described plastic draining board and vacuum well point pipe are matrix form or quincunx distribution, and the spacing of described plastic draining board is 0.3～4 meter; The spacing of described vacuum well point pipe is 1.5～4 meters.
According to a preferred embodiment of the present invention, described several change energy ranges all over the change energy forced ramming are 500KNM～10000KNM, ram pass by force and ram 2～8 times for strong, and be 1～10 day at interval the blanking time of energy forced ramming.
According to a preferred embodiment of the present invention, the scope of vacuumizing of described vacuum pump is 500m
2～1200m
2/ platform, the described vacuum that vacuumizes is 85～100kpa.
According to a preferred embodiment of the present invention, the clay height of the interface that is connected with plastic draining board of described covering flexible pipe is 0.3～1.5 meter.
Method of the present invention provides a kind of new technology and new control criterion.The method that this method provides has overcome the defective of conventional method, reaches more and saves the duration, more saves cost, and is particularly more quality controllable, more environmental protection.Use novel fast " high-vacuum densification " provided by the invention flexible foundation treatment method to handle the weak soil of water content height, poor permeability, can accelerate the discharge of excess pore water, can also guarantee engineering construction quality better simultaneously, the reduction duration.
The specific embodiment
Below in conjunction with specific embodiment, the invention will be further described.Should be understood that following examples only are used to the present invention is described but not are used to limit scope of the present invention.
" flexible pipe " that uses among the present invention, its intensity should satisfy: when carrying out dynamic consolidation construction, can not cause the generation of rough sledding such as flexible pipe breakage, to guarantee construction quality.
Method provided by the invention mainly may further comprise the steps:
The first step: plastic draining board and vacuum well point pipe are inserted respectively in the subgrade that needs to handle, wherein, described plastic draining board uses the geotextiles parcel, the upper end closed with covers, described lid is provided with and is used to connect the interface of flexible pipe and is connected to pumped vacuum systems by flexible pipe, and described vacuum well point pipe is connected to pumped vacuum systems by flexible pipe;
According to the present invention, plastic draining board and vacuum well point pipe are for matrix form or quincunx distribution, at transmission coefficient 10
-4～10
-8In the weak soil of cm/s, the spacing of described plastic draining board is 0.3～4 meter; The spacing of described vacuum well point pipe is 1.5～4 meters;
According to the present invention, the scope of vacuumizing of vacuum pump is 500m
2～1200m
2/ platform.
Second step, clay sealing
Cover the interface that flexible pipe is connected with the lid of plastic draining board upper end with clay, so that interface is closely knit air tight, cover height is generally 0.3～1.5m.
The 3rd goes on foot, vacuumizes, and carries out several intersections that vacuumize all over the combination of change energy forced ramming and hits close construction
Treat that earthing begins to vacuumize after closely knit, and implement to become the energy multipass and ram by force that wherein, the vacuum that vacuumizes is 85～100kpa preferably; The change energy range is 500～10000KNM, and strong rammer of multipass is generally strong rammer 2～8 times, and is every all over ramming by force general 1～10 day at interval.
When using method of the present invention to operate,, also should be noted that following control criterion for obtaining the better implement effect:
1, for different soil layers, different transmission coefficients needs to adopt different pumpway distances, and transmission coefficient is more little, and spacing is more little, and generally speaking, the transmission coefficient value is 10
-4～10
-8Cm/s, spacing adopts 0.3～4m;
2, according to different transmission coefficients, different water content needs to adopt different the rammer to change, and is higher to water content, the weak soil that transmission coefficient is less, and rammer can be 500KNM～10000KNM, low earlier back height is rammed;
3, the best compactness of calculating optimum water content (being bearing capacity) is rammed by force progressively near optimum moisture content by multipass then, best compactness, and strong rammer of multipass is generally strong rammer 2～10 times;
4, every all over vacuum, the control of vacuum time, optimal vacuum pressure control 85～100kpa, optimum vacuum time control 2～10 days;
5, best soil body frequency and the best are rammed FREQUENCY CONTROL for less than soil body natural frequency 15%.
The soft foundation at embodiment 1, certain harbour is fixed
Certain storage yard engineering, soil layer situation are mucky soil, thick about 8～10 meters, and water content 55%, transmission coefficient 1.2 * 10
-7Cm/s.
Designing requirement: the bearing capacity of ground reaches 100KPa in 10 meters.
Specific embodiments is as follows:
The first step, in weak soil, insert plastic draining board and vacuum well point pipe respectively with matrix form, wherein, distance between adjacent plastic draining board is 0.3～0.5 meter, distance between the pipe of vacuum well point is 1.5～2.0 meters, plastic draining board uses the geotextiles parcel, the upper end closed with covers of plastic draining board, and described lid is provided with interface, and being connected to pumped vacuum systems by flexible pipe, the vacuum well point pipe is connected to pumped vacuum systems by flexible pipe;
Wherein, vacuum pump vacuumizes being set to of scope: per 500～600m
2Weak soil is installed one.
Second step, clay sealing
The interface that flexible pipe is connected with plastic draining board uses clay to cover 0.3～0.7m, and is closely knit to earthing, air tight to guarantee to vacuumize during whole construction.
The 3rd step: vacuumize, the line number of going forward side by side is hit close construction all over becoming energy forced ramming in conjunction with the intersection that vacuumizes
Vacuumize, and implement intermittent multipass and become energy forced ramming, whenever carry out on-the-spot test all over after strong the rammer, and according to testing result, determine whether to carry out next and ram all over strong, wherein, the vacuum degree control that vacuumizes is 85kpa, intermittently becomes the energy multipass to ram operation by force as follows:
First pass rams can get 800KNM, hits several 2 and hits, and intermittently fate is 3 days;
Second time rammer can be got 1600KNM, hits several 2 and hits, and intermittently fate is 5 days;
The 3rd time rammer can be got 3200KNM, hits several 3 and hits, and intermittently fate is 7 days;
The 4th time rammer can be got 3200KNM, hits several 3 and hits, and intermittently fate is 7 days;
Through on-the-spot test, intersect for the 4th time hit close after, technical indicator reaches designing requirement, so all pull out flexible pipe, carries out low-yield full the rammer.
Detect behind the worker, the bearing capacity of foundation soil after consolidation process reaches designing requirement.
Analyze as calculated, compare with form of construction work commonly used both at home and abroad at present, adopt said method to construct, the cost of saving is about 50 yuan/m
2, and the construction period can shorten more than 50%, and operate light safety.
Embodiment 2, certain riverine reinforced soft soil ground engineering
Certain riverine soft foundation, soil layer situation are mucky soil, and thick about 7～10 meters, water content is about 60%, transmission coefficient 1.7 * 10
-8Cm/s.
Designing requirement: the bearing capacity of ground reaches 100KPa in 10 meters.
Specific embodiments is as follows:
The first step, in weak soil with quincunx plastic draining board and the vacuum well point pipe that inserts respectively, wherein, the distance between adjacent plastic draining board is 0.8～1.5 meter, the distance between the pipe of vacuum well point is 2.0～2.5 meters.Plastic draining board uses the geotextiles parcel, the upper end closed with covers of plastic draining board, and described lid is provided with interface, and is connected to pumped vacuum systems by flexible pipe, and the vacuum well point pipe is connected to pumped vacuum systems by flexible pipe;
Wherein, vacuum pump vacuumizes being set to of scope: per 700～800m
2Weak soil is installed one.
Second step, clay sealing
The interface that flexible pipe is connected with plastic draining board uses clay to cover 0.5～1.0m, and is closely knit to earthing, air tight to guarantee to vacuumize during whole construction.
The 3rd step: vacuumize, the line number of going forward side by side is hit close construction all over becoming energy forced ramming in conjunction with the intersection that vacuumizes
Vacuumize, and implement the intermittent energy multipass that becomes and ram by force, whenever carry out on-the-spot test all over after strong the rammer, and according to testing result, determine whether to carry out next and ram all over strong, wherein, the vacuum degree control that vacuumizes is 100kpa, intermittently becomes the energy multipass to ram operation by force as follows:
First pass rams can get 1000KNM, hits several 2 and hits, and intermittently fate is 6 days;
Second time rammer can be got 1500KNM, hits several 2 and hits, and intermittently fate is 6 days;
The 3rd time rammer can be got 1500KNM, hits several 3 and hits, and intermittently fate is 7 days;
The 4th time rammer can be got 2000KNM, hits several 4 and hits, and intermittently fate is 7 days;
The 5th time rammer can be got 2000KNM, hits several 5 and hits, and intermittently fate is 8 days;
The 6th time rammer can be got 3000KNM, hits several 5 and hits, and intermittently fate is 8 days;
Through on-the-spot test, intersect for the 6th time hit close after, technical indicator reaches designing requirement, so all pull out flexible pipe, carries out low-yield full the rammer.
Detect behind the worker, the bearing capacity of foundation soil after consolidation process reaches designing requirement.
Analyze as calculated, compare with form of construction work commonly used both at home and abroad at present, adopt said method to construct, the cost of saving is about 120 yuan/m
2, and the construction period can shorten more than 50%, and operate light safety.
The soft foundation at embodiment 3, certain harbour is fixed
Certain storage yard engineering, soil layer situation are mucky soil, thick about 8～10 meters, and water content 45%, transmission coefficient 1.0 * 10
-4Cm/s.
Designing requirement: the bearing capacity of ground reaches 100KPa in 10 meters.
Specific embodiments is as follows:
The first step, insert plastic draining board and vacuum well point pipe respectively with matrix form in weak soil, wherein, the distance between adjacent plastic draining board is 2.0～2.5 meters, and the distance between the pipe of vacuum well point is 2.5～3.0 meters.Plastic draining board uses the geotextiles parcel, the upper end closed with covers of plastic draining board, and described lid is provided with interface, and is connected to pumped vacuum systems by flexible pipe, and the vacuum well point pipe is connected to pumped vacuum systems by flexible pipe;
Wherein, vacuum pump vacuumizes being set to of scope: per 900～1000m
2Weak soil is installed one.
Second step, clay sealing
The interface that flexible pipe is connected with plastic draining board uses clay to cover 1.2～1.5m, and is closely knit to earthing, air tight to guarantee to vacuumize during whole construction.
The 3rd step: vacuumize, the line number of going forward side by side is hit close construction all over becoming energy forced ramming in conjunction with the intersection that vacuumizes
Vacuumize, and implement intermittent multipass and become energy forced ramming, whenever carry out on-the-spot test all over after strong the rammer, and according to testing result, determine whether to carry out next and ram all over strong, wherein, the vacuum degree control that vacuumizes is 95kpa, intermittently becomes the energy multipass to ram operation by force as follows:
First pass rams can get 1600KNM, hits several 2 and hits, and intermittently fate is 6 days;
Second time rammer can be got 8000KNM, hits several 6 and hits, and intermittently fate is 9 days;
Through on-the-spot test, intersect for second time hit close after, technical indicator reaches designing requirement, so all pull out flexible pipe, carries out low-yield full the rammer.
Detect behind the worker, the bearing capacity of foundation soil after consolidation process reaches designing requirement.
Analyze as calculated, compare with form of construction work commonly used both at home and abroad at present, adopt said method to construct, the cost of saving is about 70 yuan/m
2, and the construction period can shorten more than 60%, and operate light safety.
Embodiment 4, certain coastal reinforced soft soil ground engineering
Certain coastal soft foundation, soil layer situation are mucky soil, and thick about 7～10 meters, water content is about 55%, transmission coefficient 2.7 * 10
-5Cm/s.
Designing requirement: the bearing capacity of ground reaches 180KPa in 10 meters.
Specific embodiments is as follows:
The first step, in weak soil with quincunx plastic draining board and the vacuum well point pipe that inserts respectively, wherein, the distance between adjacent plastic draining board is 3.5～4.0 meters, the distance between the pipe of vacuum well point is 3.5～4.0 meters.Plastic draining board uses the geotextiles parcel, the upper end closed with covers of plastic draining board, and described lid is provided with interface, and is connected to pumped vacuum systems by flexible pipe, and the vacuum well point pipe is connected to pumped vacuum systems by flexible pipe;
Wherein, vacuum pump vacuumizes being set to of scope: per 1100～1200m
2Weak soil is installed one.
Second step, clay sealing
The interface that flexible pipe is connected with plastic draining board uses clay to cover 1.2～1.5m, and is closely knit to earthing, air tight to guarantee to vacuumize during whole construction.
The 3rd step: vacuumize, the line number of going forward side by side is hit close construction all over becoming energy forced ramming in conjunction with the intersection that vacuumizes
Vacuumize, and implement the intermittent energy multipass that becomes and ram by force, whenever carry out on-the-spot test all over after strong the rammer, and according to testing result, determine whether to carry out next and ram all over strong, wherein, the vacuum degree control that vacuumizes is 120kpa, intermittently becomes the energy multipass to ram operation by force as follows:
First pass rams can get 500KNM, hits several 2 and hits, and intermittently fate is 1 day;
Second time rammer can be got 1000KNM, hits several 2 and hits, and intermittently fate is 3 days;
The 3rd time rammer can be got 2000KNM, hits several 3 and hits, and intermittently fate is 4 days;
The 4th time rammer can be got 3500KNM, hits several 3 and hits, and intermittently fate is 5 days;
The 5th time rammer can be got 5000KNM, hits several 4 and hits, and intermittently fate is 7 days;
The 6th time rammer can be got 6500KNM, hits several 4 and hits, and intermittently fate is 8 days;
The 7th time rammer can be got 7500KNM, hits several 5 and hits, and intermittently fate is 9 days;
The 8th time rammer can be got 8500KNM, hits several 5 and hits, and intermittently fate is 10 days;
Through on-the-spot test, intersect for the 8th time hit close after, technical indicator reaches designing requirement, so all pull out flexible pipe, carries out low-yield full the rammer.
Detect behind the worker, the bearing capacity of foundation soil after consolidation process reaches designing requirement.
Analyze as calculated, compare with form of construction work commonly used both at home and abroad at present, adopt said method to construct, the cost of saving is about 150 yuan/m
2, and the construction period can shorten more than 50%, and operate light safety.
In sum, this method provides a kind of new technology and new control criterion.The method that this method provides overcomes the defective of conventional method, finds more and saves the duration, more saves cost, and is particularly more quality controllable, more environmental protection.Use novel fast " high-vacuum densification " provided by the invention flexible foundation treatment method to handle the weak soil of water content height, poor permeability, can accelerate the discharge of super interstitial water, can also guarantee engineering construction quality better simultaneously, the reduction duration.
Claims (10)
1. a quick ' high-vacuum densification ' soft foundation processing method is characterized in that, said method comprising the steps of:
The first step: plastic draining board and vacuum well point pipe are inserted respectively in the subgrade that needs to handle, wherein, described plastic draining board uses the geotextiles parcel, the upper end closed with covers, described lid is provided with and is used to connect the interface of flexible pipe and is connected to pumped vacuum systems by flexible pipe, and described vacuum well point pipe is connected to pumped vacuum systems by flexible pipe;
Second step: cover the interface that flexible pipe is connected with the lid of plastic draining board upper end with clay, so that interface is closely knit air tight;
The 3rd step: start pumped vacuum systems, carry out several intersections that vacuumize all over the combination of change energy forced ramming and hit close construction.
2. the method for claim 1 is characterized in that, the transmission coefficient of described weak soil is 10
-4～10
-8Cm/s.
3. the method for claim 1 is characterized in that, described plastic draining board and vacuum well point pipe are matrix form or quincunx distribution.
4. the method for claim 1 is characterized in that, the spacing of described plastic draining board is 0.3～4 meter; The spacing of described vacuum well point pipe is 1.5～4 meters.
5. the method for claim 1 is characterized in that, the described vacuum that vacuumizes is 85～100kpa.
6. the method for claim 1 is characterized in that, described several change energy ranges all over the change energy forced ramming are 500KNM～10000KNM.
7. the method for claim 1 is characterized in that, described several strong rammer passes all over the change energy forced ramming ram 2～8 times into strong.
8. the method for claim 1 is characterized in that, and is described several all over being 1～10 day at interval the blanking time that becomes energy forced ramming.
9. the method for claim 1 is characterized in that, the scope of vacuumizing of described vacuum pump is 500m
2～1200m
2/ platform.
10. the method for claim 1, the height of the clay of the interface that described covering flexible pipe is connected with plastic draining board is 0.3～1.5 meter.
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|---|---|---|---|
| CN200910248052XA CN102116019A (en) | 2009-12-31 | 2009-12-31 | Method for rapidly treating soft foundation through high vacuum densification |
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|---|---|---|---|
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| CN102518115A (en) * | 2011-12-22 | 2012-06-27 | 中铁第四勘察设计院集团有限公司 | Method for reinforcing soft soil foundation of large-area storage yard |
| CN102828499A (en) * | 2012-05-04 | 2012-12-19 | 上海港湾基础建设（集团）有限公司 | Improved quick high vacuum densification soft foundation treatment method |
| CN104088268A (en) * | 2014-07-23 | 2014-10-08 | 中交一航局第五工程有限公司 | Construction method for handling soft soil foundation through light well point precipitation and dynamic compaction replacement method |
| CN104929102A (en) * | 2015-04-23 | 2015-09-23 | 上海交通大学 | Silt rheology vacuum vibration combined dewatering system and method |
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| CN104929102A (en) * | 2015-04-23 | 2015-09-23 | 上海交通大学 | Silt rheology vacuum vibration combined dewatering system and method |
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Address after: 26, 1188 floor, ocean Plaza, No. 200092 Siping Road, Shanghai Applicant after: Shanghai harbor infrastructure (Group) Co., Ltd. Address before: 26, 1188 floor, ocean Plaza, No. 200092 Siping Road, Shanghai Applicant before: Introduction To Geoharbour Group |
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Application publication date: 20110706 |