CN102518115A - Method for reinforcing soft soil foundation of large-area storage yard - Google Patents
Method for reinforcing soft soil foundation of large-area storage yard Download PDFInfo
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- CN102518115A CN102518115A CN2011104359999A CN201110435999A CN102518115A CN 102518115 A CN102518115 A CN 102518115A CN 2011104359999 A CN2011104359999 A CN 2011104359999A CN 201110435999 A CN201110435999 A CN 201110435999A CN 102518115 A CN102518115 A CN 102518115A
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Abstract
The invention discloses a method for reinforcing a soft soil foundation of a large-area storage yard, which includes steps: firstly, filling sand to the storage yard and delimiting a reinforcing area; secondly, rolling the reinforcing area; thirdly, arranging multiple deep sealed pipes outside the reinforcing area, arranging multiple shallow sealed pipes around the deep sealed pipes and arranging downcomers in multiple rows in the reinforcing area, wherein the downcomes in each row include multiple funneled shallow downcomers and multiple funneled deep downcomers are arranged alternatively sequentially, and a vacuum pump is used for sucking water in the deep sealed pipes, the shallow sealed pipes, the deep downcomers and the shallow downcomers; fourthly, demounting the deep downcomers and the shallow downcomers in the reinforcing area, reserving the deep sealed pipes and the shallow sealed pipes for continuous vacuum water descending, uniformly arranging a plurality of tamping points in the reinforcing area, strongly tamping the tamping points and backfilling tamped pits with sand; and fifthly, rolling the reinforcing area twice. The method for reinforcing the soft soil foundation of the large-area storage yard is convenient in construction, low in manufacturing cost and effective in reinforcing.
Description
Technical field
The present invention relates to the railway bed building field, relate in particular to the reinforcement means of a kind of large tracts of land stockyard soft foundation.
Background technology
The stockyard is loading and unloading, transhipment, keeping that is used to handle container and the place that joins.There is certain requirement in the large tracts of land stockyard to the bearing capacity and the settlement Control of foundation soil.Soft foundation is prone to cause foundation instability because bearing capacity is not enough, and construction back sedimentation or relative settlement surpass control criterion, thereby, cause paving, stockyard cracking, influence the normal use in stockyard.So, need reinforce soft foundation.
The reinforcement means of existing large tracts of land stockyard soft foundation mainly contains following two kinds.A kind of is the method that discharging consolidation and surcharge preloading combine, yet, because surcharge preloading needs a large amount of precompressed earthwork, fetch earth in a large number, not only destroy land resources, and after the precompressed completion, it is extraterrestrial to need that the precompressed earthwork is removed the field, need seek the spoir place.In addition, nervous area, native source, precompressed cut-fill transition difficulty, and the construction period is long, is difficult to satisfy the requirement of owner to the duration.Another kind is the method for forced ramming reinforcing, yet, the forced ramming reinforcing method be applicable to banket or sandy soil in use; In soft foundation, because groundwater table is high, the strong interstitial hydraulic pressure that produces that rams reduces strong rammer effect; Tamping energy is too small, does not have the effect of reinforcing, excessively then spongy soil can occur.
Therefore, be necessary to provide the reinforcement means of a kind of improved large tracts of land stockyard soft foundation to overcome above-mentioned defective.
Summary of the invention
The reinforcement means that the purpose of this invention is to provide a kind of easy construction, cost is low and consolidation effect is good large tracts of land stockyard soft foundation.
To achieve these goals, the invention provides the reinforcement means of a kind of large tracts of land stockyard soft foundation, comprise the steps: (1) back-up sand and delimit reinforcing area on the stockyard; (2) roll reinforcing area; (3) outside reinforcing area respectively along horizontal and vertical equidistant layout many deep layer tube sealings; In the periphery of deep layer tube sealing respectively along many shallow-layer tube sealings of horizontal and vertical equidistant layout; In reinforcing area, equidistantly arrange many row's downcomers; Every row's downcomer comprises equidistantly the many funnel type shallow-layer downcomers and the Duo Gen funnel type deep layer downcomer of arranged alternate successively, through vacuum pump deep layer tube sealing, shallow-layer tube sealing, deep layer downcomer and shallow-layer downcomer is drawn water; (4) remove reinforcing area interior deep layer downcomer and shallow-layer downcomer; Keep deep layer tube sealing and shallow-layer tube sealing and continue vacuum-dewatering; And in reinforcing area, ram a little and a little carry out one or many and ram by force ramming through hammer ram along horizontal and vertical equidistant layout is a plurality of respectively, strong rammer is afterwards with sand backfill tamping pit; (5) reinforcing area is rolled twice.
Preferably; Further comprising the steps of between said step (4) and the said step (5): repeating step (3)～(4); Ram with strong to carry out once more precipitation; Strong once more ram ram a little be arranged in by adjacent four last arrange ram the foursquare center that a little surrounds, and the strong once more tamping energy that rams is greater than the last time tamping energy of rammer by force.
Preferably, the strong single-point tamping energy that rams is 1000～2000kN.m.
Preferably, ram the hammer ram that is adopted to select the hammer floor space for use be 5m by force
2, hammer heavily is the circular cast steel hammer ram of 150kN.
Preferably; Said step (3) is specially: outside reinforcing area 5m, arrange a deep layer tube sealing along horizontal and vertical every separated 2m respectively; Outside deep layer tube sealing reinforcing area 9m, arrange a shallow-layer tube sealing along horizontal and vertical every separated 2m respectively; In reinforcing area, whenever arrange row's downcomer at a distance from 4～6m; Every row's downcomer comprises every many funnel type shallow-layer downcomers and Duo Gen funnel type deep layer downcomer at a distance from 2m arranged alternate successively, and through vacuum pump deep layer tube sealing, shallow-layer tube sealing, deep layer downcomer and shallow-layer downcomer is drawn water.
Preferably, said step (3) also comprises: in reinforcing area, arrange a water level detecting hole, and the water level detecting meter is installed in the water level detecting hole.
Preferably, said step (4) is specially: the groundwater table that gets when the water level detecting instrumentation is reduced to original ground 3m when following, removes deep layer downcomer and shallow-layer downcomer in the reinforcing area; Keep deep layer tube sealing and shallow-layer tube sealing and continue vacuum-dewatering; And in reinforcing area, arrange one at a distance from 4～5m and ram a little that adjacent two spacings of arranging between ramming a little also are 4～5m, and a little carry out one or many and ram by force ramming through hammer ram along laterally every; After strong the rammer, tamping pit is used the sand backfill.
Preferably, the buried depth of deep layer tube sealing, shallow-layer tube sealing, deep layer downcomer and shallow-layer downcomer is 4～8m.
Preferably, said step (5) is specially: adopt the above road roller of 260kN that reinforcing area is rolled twice.
Compared with prior art, the present invention has following beneficial effect:
1. the reinforcement means of large tracts of land of the present invention stockyard soft foundation adopts the strong mode of ramming of vacuum-dewatering associating; Can be before strong the rammer, the mode dewatering that adopts vacuum to draw water earlier, thereby; Can avoid producing pore water pressure on the ground in stockyard; Just can avoid occurring the situation of spongy soil again through the tamping energy that improves strong rammer, thereby, the consolidation effect of strong rammer can be improved;
2. before vacuum-dewatering and strong the rammer,, can improve soil property and serve as working cushion layer in the back-up sand of top layer, stockyard, thereby, be convenient to construction and help strengthening consolidation effect;
3. the tamping pit after strong the rammer is used the sand backfill, can make consolidation effect better;
4. be arranged in peripheral deep layer tube sealing of reinforcing area and shallow-layer tube sealing and form sealing ring, can stop peripheral underground water to infiltrate reinforcing area;
5. the funnel type shallow-layer downcomer in the reinforcing area is that arranged alternate and shallow-layer downcomer are different with the high and low position of deep layer downcomer with funnel type deep layer downcomer; The line of adjacent two shallow-layer downcomers and the deep layer downcomer between adjacent two shallow-layer downcomers can form a funnel type curve; The deep layer downcomer that is positioned at lower position can replenish precipitation to the shallow-layer downcomer; Underground water around the shallow-layer downcomer is extracted out; Thereby, can get rid of the underground water of each layer position in the reinforcing area well, reach dewatering effect preferably;
6. reinforcement means easy construction, the cost of large tracts of land of the present invention stockyard soft foundation is low and the duration is controlled, thereby, further widened the scope of application of dynamic compaction and well-points dewatering.
Through following description and combine accompanying drawing, it is more clear that the present invention will become, and these accompanying drawings are used to explain embodiments of the invention.
Description of drawings
Fig. 1 is the flow chart of the reinforcement means of large tracts of land of the present invention stockyard soft foundation.
The layout sketch map of Fig. 2 deep layer tube sealing, shallow-layer tube sealing, deep layer downcomer and shallow-layer downcomer.
Fig. 3 rams a little and rams for second time layout sketch map a little for first pass.
The specific embodiment
With reference now to accompanying drawing, describe embodiments of the invention, the similar elements label is represented similar elements in the accompanying drawing.
Shown in Fig. 1-3, the reinforcement means of present embodiment large tracts of land stockyard soft foundation comprises the steps:
Step S1, back-up sand and delimit reinforcing area on the stockyard;
Step S2 rolls reinforcing area;
Step S3 arranges a deep layer tube sealing 10 along horizontal and vertical every separated 2m respectively outside reinforcing area 5m, respectively along horizontal and vertical every at a distance from shallow-layer tube sealing 11 of 2m layout, the buried depth of deep layer tube sealing 10 and shallow-layer tube sealing 11 is 4m outside reinforcing area 9m;
Step S4, it is every in reinforcing area that every row's downcomer comprises every many funnel type shallow-layer downcomers 13 and Duo Gen funnel type deep layer downcomer 12 at a distance from 2m arranged alternate successively at a distance from 6m layout one row's downcomer, the buried depth of deep layer downcomer 12 and shallow-layer downcomer 13 is 4m;
Step S5 is provided with a water level detecting hole (not shown) in reinforcing area;
Step S6 draws water to deep layer tube sealing 10, shallow-layer tube sealing 11, deep layer downcomer 12 and shallow-layer downcomer 13 through vacuum pump;
Step S7 reduces to original ground 3m when following when the groundwater table that records through the water level detecting hole, removes deep layer downcomer 12 and shallow-layer downcomer 13 in the reinforcing area, keeps deep layer tube sealing 10 and continues vacuum-dewatering with shallow-layer tube sealing 11;
Step S8 arranges that at a distance from 5m first pass rams a little 14, adjacent two and ranked first and time ram a little that the spacing between 14 is 5m along laterally every in reinforcing area; And through hammer ram first pass is rammed some the last 14 and ram; The strong back of ramming is with sand backfill tamping pit, and wherein, the strong tamping energy that rams of first pass is 1000kN.m;
Step S9, repeating step S3～S8 rams with strong to carry out second time precipitation, second time strong second time of ramming rammed a little 15 and is arranged in by four adjacent first passes and rams a little the 14 foursquare centers that surround, and second time by force the tamping energy of rammer be 1600kN.m;
Step S10 adopts the above road roller of 260kN that reinforcing area is rolled twice.
Need to prove: it is 5m that the hammer ram that strong rammer is adopted is selected the hammer floor space for use
2, hammer heavily is the circular cast steel hammer ram of 150kN.The strong rammer of first pass and second time strong interval time that rams were 1 week.
Before construction, need the basic soil in stockyard is carried out in-situ test and dynamic compaction test, to confirm to reinforce parameter.The degree of depth that said reinforcing parameter comprises the deep layer tube sealing with at interval, the degree of depth of shallow-layer tube sealing and at interval, the degree of depth of deep layer downcomer and at interval, the degree of depth of shallow-layer downcomer and at interval, ram spacing, tamping energy, the time interval of ramming a little and ram number of times.During concrete the construction, can and combine actual conditions to confirm the numerical value of concrete parameter with reference to these parameters.For example, ram by force and stop the rammer standard except ramming the number of times in the step according to what obtain through test, also will be, whenever hit parameter such as injection amount with reference to protuberance amount around the tamping pit, crater depth, determine when and stop ramming.
Can know that by technique scheme the degree of depth of deep layer downcomer confirms that by the strong influence basin of ramming mainly extract underground water in the deep formation, the shallow-layer downcomer mainly extracts underground water in the superficial part stratum, guarantees that precipitation depth meets design requirement.Peripheral deep layer tube sealing and shallow-layer tube sealing prevent that peripheral phreatic supply from infiltrating and the stabilization zone groundwater table rise that causes.Peripheral deep layer tube sealing and shallow-layer tube sealing are provided with at the stabilization zone periphery, form sealing ring, through construction verification, can stop peripheral underground water to infiltrate stabilization zone preferably.In reinforcing area, adopt shallow-layer downcomer and deep layer downcomer interlaced arrangement simultaneously, can get rid of the underground water of each layer position in the reinforcing scope well, reach dewatering effect preferably.In addition, precipitation is carried out in the subregion in the reinforcing area, rams by force subsequently, is prone to reach construction effect.
Invention has been described more than to combine most preferred embodiment, but the present invention is not limited to the embodiment of above announcement, should contain various modification, equivalent combinations of carrying out according to essence of the present invention.
Claims (9)
1. the reinforcement means of a large tracts of land stockyard soft foundation comprises the steps:
(1) back-up sand and delimit reinforcing area on the stockyard;
(2) roll reinforcing area;
(3) outside reinforcing area respectively along horizontal and vertical equidistant layout many deep layer tube sealings; In the periphery of deep layer tube sealing respectively along many shallow-layer tube sealings of horizontal and vertical equidistant layout; In reinforcing area, equidistantly arrange many row's downcomers; Every row's downcomer comprises equidistantly the many funnel type shallow-layer downcomers and the Duo Gen funnel type deep layer downcomer of arranged alternate successively, through vacuum pump deep layer tube sealing, shallow-layer tube sealing, deep layer downcomer and shallow-layer downcomer is drawn water;
(4) remove reinforcing area interior deep layer downcomer and shallow-layer downcomer; Keep deep layer tube sealing and shallow-layer tube sealing and continue vacuum-dewatering; And in reinforcing area, ram a little and a little carry out one or many and ram by force ramming through hammer ram along horizontal and vertical equidistant layout is a plurality of respectively, strong rammer is afterwards with sand backfill tamping pit;
(5) reinforcing area is rolled twice.
2. the reinforcement means of large tracts of land as claimed in claim 1 stockyard soft foundation is characterized in that, and is further comprising the steps of between said step (4) and the said step (5):
Repeating step (3)～(4) are rammed with strong to carry out once more precipitation, strong once more ram ram a little be arranged in by adjacent four last arrange ram the foursquare center that a little surrounds, and the strong once more tamping energy that rams is greater than the last time tamping energy of rammer by force.
3. the reinforcement means of large tracts of land as claimed in claim 2 stockyard soft foundation is characterized in that, the strong single-point tamping energy that rams is 1000～2000kN.m.
4. the reinforcement means of large tracts of land as claimed in claim 3 stockyard soft foundation is characterized in that, it is 5m that the hammer ram that strong rammer is adopted is selected the hammer floor space for use
2, hammer heavily is the circular cast steel hammer ram of 150kN.
5. the reinforcement means of large tracts of land as claimed in claim 1 stockyard soft foundation is characterized in that, said step (3) is specially:
Outside reinforcing area 5m, arrange a deep layer tube sealing along horizontal and vertical every separated 2m respectively; Outside deep layer tube sealing reinforcing area 9m, arrange a shallow-layer tube sealing along horizontal and vertical every separated 2m respectively; In reinforcing area, whenever arrange row's downcomer at a distance from 4～6m; Every row's downcomer comprises every many funnel type shallow-layer downcomers and Duo Gen funnel type deep layer downcomer at a distance from 2m arranged alternate successively, and through vacuum pump deep layer tube sealing, shallow-layer tube sealing, deep layer downcomer and shallow-layer downcomer is drawn water.
6. the reinforcement means of large tracts of land as claimed in claim 1 stockyard soft foundation is characterized in that, said step (3) also comprises: in reinforcing area, arrange a water level detecting hole, and the water level detecting meter is installed in the water level detecting hole.
7. the reinforcement means of large tracts of land as claimed in claim 6 stockyard soft foundation is characterized in that, said step (4) is specially:
The groundwater table that gets when the water level detecting instrumentation is reduced to original ground 3m when following; Remove deep layer downcomer and shallow-layer downcomer in the reinforcing area; Keep deep layer tube sealing and shallow-layer tube sealing and continue vacuum-dewatering, and in reinforcing area, ram a little along laterally whenever arranging one at a distance from 4～5m, the spacing between adjacent two rows ram a little also is 4～5m; And a little carry out one or many and ram by force ramming through hammer ram, the strong back of ramming is with sand backfill tamping pit.
8. the reinforcement means of large tracts of land as claimed in claim 1 stockyard soft foundation is characterized in that the buried depth of deep layer tube sealing, shallow-layer tube sealing, deep layer downcomer and shallow-layer downcomer is 4～8m.
9. the reinforcement means of large tracts of land as claimed in claim 1 stockyard soft foundation is characterized in that, said step (5) is specially:
Adopt the above road roller of 260kN that reinforcing area is rolled twice.
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| CN2011104359999A CN102518115A (en) | 2011-12-22 | 2011-12-22 | Method for reinforcing soft soil foundation of large-area storage yard |
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| CN2011104359999A CN102518115A (en) | 2011-12-22 | 2011-12-22 | Method for reinforcing soft soil foundation of large-area storage yard |
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| CN102912800A (en) * | 2012-10-08 | 2013-02-06 | 中冶集团武汉勘察研究院有限公司 | PTBD (Three-dimensional Combination Reinforcement) technology for treating after-built high and steep fill slope |
| CN103669329A (en) * | 2013-12-25 | 2014-03-26 | 新疆新工勘岩土工程勘察设计院有限公司 | Process for direct dynamic compaction method treatment of ultra-deep building dump pit |
| CN107100182A (en) * | 2017-05-17 | 2017-08-29 | 福建岩土工程勘察研究院 | Soft foundation cluster type layering precipitation no-arbitrary pricing pipe rams system and its construction method |
| CN107268572A (en) * | 2017-07-11 | 2017-10-20 | 中冶华天工程技术有限公司 | A kind of large area mud soft soil foundation hardening process |
| CN110331710A (en) * | 2019-06-24 | 2019-10-15 | 中国路桥工程有限责任公司 | Harbour large area super soft ground processing method |
| CN111119874A (en) * | 2018-10-31 | 2020-05-08 | 中国石油化工股份有限公司 | Combined type sand filling device with controllable permeability and sand filling method |
| CN111809603A (en) * | 2019-04-10 | 2020-10-23 | 上海港湾基础建设（集团）股份有限公司 | High-vacuum densification soft foundation treatment method |
| CN113605359A (en) * | 2021-08-13 | 2021-11-05 | 中冶集团武汉勘察研究院有限公司 | Multilayer complex soft soil foundation rapid dewatering consolidation construction structure and construction method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102912800A (en) * | 2012-10-08 | 2013-02-06 | 中冶集团武汉勘察研究院有限公司 | PTBD (Three-dimensional Combination Reinforcement) technology for treating after-built high and steep fill slope |
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| CN103669329A (en) * | 2013-12-25 | 2014-03-26 | 新疆新工勘岩土工程勘察设计院有限公司 | Process for direct dynamic compaction method treatment of ultra-deep building dump pit |
| CN107100182A (en) * | 2017-05-17 | 2017-08-29 | 福建岩土工程勘察研究院 | Soft foundation cluster type layering precipitation no-arbitrary pricing pipe rams system and its construction method |
| CN107268572A (en) * | 2017-07-11 | 2017-10-20 | 中冶华天工程技术有限公司 | A kind of large area mud soft soil foundation hardening process |
| CN111119874A (en) * | 2018-10-31 | 2020-05-08 | 中国石油化工股份有限公司 | Combined type sand filling device with controllable permeability and sand filling method |
| CN111119874B (en) * | 2018-10-31 | 2023-09-01 | 中国石油化工股份有限公司 | Combined sand filling device with controllable permeability and sand filling method |
| CN111809603A (en) * | 2019-04-10 | 2020-10-23 | 上海港湾基础建设（集团）股份有限公司 | High-vacuum densification soft foundation treatment method |
| CN110331710A (en) * | 2019-06-24 | 2019-10-15 | 中国路桥工程有限责任公司 | Harbour large area super soft ground processing method |
| CN113605359A (en) * | 2021-08-13 | 2021-11-05 | 中冶集团武汉勘察研究院有限公司 | Multilayer complex soft soil foundation rapid dewatering consolidation construction structure and construction method |
| CN113605359B (en) * | 2021-08-13 | 2022-06-21 | 中冶集团武汉勘察研究院有限公司 | Multilayer complex soft soil foundation rapid dewatering consolidation construction structure and construction method |
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Application publication date: 20120627 |