CN107268572B - Large-area silt soft soil foundation hardening treatment method - Google Patents
Large-area silt soft soil foundation hardening treatment method Download PDFInfo
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- CN107268572B CN107268572B CN201710558841.8A CN201710558841A CN107268572B CN 107268572 B CN107268572 B CN 107268572B CN 201710558841 A CN201710558841 A CN 201710558841A CN 107268572 B CN107268572 B CN 107268572B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/18—Making embankments, e.g. dikes, dams
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/10—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
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Abstract
The invention discloses a hardening treatment method for a large-area silt soft soil foundation, which is characterized by comprising the following steps of: according to different use functions of the field, the field is reasonably divided into a greening area and a non-greening area, wherein the non-greening area is divided into a production area and a non-production area, and different foundation treatment methods are adopted for different blocks; the greening area is backfilled by adopting backfilled soil and then is treated by full tamping or vibration rolling; and the non-greening area is comprehensively treated by inserting and punching plastic drainage plates, arranging a pipe well for dewatering, piling and carrying combined prepressing and dynamic drainage consolidation methods. The method adopts a line production mode when treating the foundation of each block, gives consideration to economy and expected foundation treatment effect, can effectively solve the problem of hardening of large-area silt soft soil foundation, meets the requirement of actual engineering, and has strong practicability.
Description
Technical Field
The invention relates to the technical field of construction, in particular to a hardening treatment method for a large-area silt soft soil foundation.
Background
In actual engineering practice, the bearing capacity of the silt soft soil foundation is low, the compressibility is large, the water permeability is poor, the design requirements of the building foundation are not easily met, and therefore the treatment is needed, although the dynamic compaction method for reinforcing the soft foundation is suitable for gravel soil, sandy soil, miscellaneous filling soil with low water content and collapsible loess, effective drainage must be provided for the reinforcement treatment of the saturated soft clay foundation, and otherwise rubber soil is likely to appear in the construction process. At present, the foundation treatment method of the soft soil foundation is limited to a single treatment method, such as a pile foundation method, a soil replacement method and the like, the single treatment method is generally suitable for treating the small-area soft soil foundation, and if the construction method is applied to the large-area soft soil foundation hardening engineering, especially when the sludge soft soil foundation is hardened, the expected effect is difficult to achieve, and the construction cost is high; therefore, a hardening treatment method for large-area soft soil foundation is needed, and the construction cost is correspondingly reduced.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the invention provides a hardening treatment method for a large-area silt soft soil foundation, which utilizes the characteristic that different areas have different use functions and have different requirements on the bearing capacity of the foundation in the hardening treatment process of the large-area silt soft soil foundation, adopts a construction scheme for hardening treatment of the foundation in blocks, ensures that the bearing capacity of the foundation in each block meets the requirements by reasonably arranging the construction process of each block, gives consideration to economic indexes, has strong practicability and is worthy of popularization.
The technical scheme for solving the technical problem of the invention is as follows:
the invention relates to a hardening treatment method of a large-area silt soft soil foundation, which is characterized by comprising the following steps of: according to different use functions of the ground, the ground is reasonably divided into a greening area and a non-greening area, wherein the non-greening area is divided into a production area and a non-production area, different ground treatment methods are adopted for different blocks, and the whole ground treatment steps are as follows:
a. leveling a field, measuring and paying off, and reasonably partitioning the field according to the use function of the field;
b. inserting a plastic drainage plate in the foundation and installing a monitoring device;
c. and arranging a pipe well in the foundation to prepare for later-stage pipe well drainage.
d. Carrying out first-stage loading on the production area through backfilling pond residues, flattening the pond residues of a first layer in the production area by using a bulldozer after the pond residues of a second layer are backfilled, and carrying out first prepressing on the production area through a plastic drainage plate and a pipe well for drainage;
e. during the first-stage loading prepressing waiting consolidation period in the production area, carrying out first-stage loading construction on the non-production area through backfilling pond residues, and carrying out first prepressing on the non-production area through a plastic drainage plate and pipe well drainage;
f. when the production area meets the second-stage loading condition, the second-stage loading is carried out by backfilling a second layer of pond residues in accordance with the first-stage loading construction mode, and combined prepressing is carried out by a plastic drainage plate and pipe well drainage after the loading is finished;
g. after the unloading condition is met in the production area, a small-range dynamic drainage consolidation test is firstly carried out, after the test is successful, the whole production area is unloaded, redundant earthwork is unloaded and moved to a non-production area, the non-production area is subjected to second loading and prepressing, and dynamic drainage consolidation construction is immediately carried out after the production area is unloaded;
h. pre-checking a production area and starting pile test construction;
i. after the second pre-pressing is carried out in the non-production area to reach the unloading condition, a small-range power drainage consolidation test is firstly carried out, after the test is successful, the whole non-production area is unloaded, and redundant earthwork is unloaded to the greening area, and the power drainage consolidation construction is carried out in the non-production area;
j. after the greening area is backfilled in place, full ramming or vibration rolling treatment is carried out;
k. and (5) checking and accepting after construction is finished.
Further, the thickness of the first layer of pond residues backfilled in the step d is 5 m.
Further, the thickness of the backfilling pond residues in the step e is 2.2 m.
Further, the thickness of the second layer of pond residues backfilled in the step f is 3 m.
Further, the dynamic drainage consolidation construction in the step g and the step i is dynamic compaction or vibration rolling.
Compared with the traditional soft soil foundation hardening treatment method, the method has the advantages that the characteristic that the bearing capacity of the foundation is different due to the difference of the use functions of different areas is utilized, the foundation hardening treatment is carried out in blocks, the bearing capacity of the foundation of each block meets the requirement by reasonably arranging the construction process of each block, the economic index is considered, and the practicability is high.
Drawings
FIG. 1 is a schematic diagram of soft soil foundation block partitioning in the present invention;
in the figure: 1-production area, 2-non-production area and 3-greening area.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
As shown in figure 1, the method for hardening the large-area sludge soft soil foundation is characterized by comprising the following steps: the method comprises the following steps of reasonably dividing a field into a greening area 3 and a non-greening area according to the using function of the field, wherein the non-greening area is divided into a production area 1 and a non-production area 2, and adopting different foundation treatment methods aiming at different blocks; because of the large-area sludge soft soil foundation, the required bearing capacity of each divided block is different due to different use functions, so that a plurality of different hardening methods are combined, the construction sequence is reasonably arranged, and the whole foundation treatment steps are as follows:
a. leveling a field, measuring and paying off, and reasonably partitioning the field according to the use function of the field;
b. inserting a plastic drainage plate in the foundation and installing a monitoring device; the plastic drainage plates are used for treating the soft soil foundation, vertical plastic drainage plates are arranged in the foundation to form a drainage well, and then pre-pressing is carried out on the ground in advance to increase effective stress acting on soil particles to accelerate consolidation settlement of the foundation, so that pore water in a soil body is discharged, and meanwhile, the strength of the foundation is gradually improved to achieve the effect of treating the foundation;
c. arranging a pipe well in the foundation to prepare for later-stage pipe well drainage;
d. carrying out first-stage loading on the production area 1 through backfilling pond residues, flattening the pond residues of a first layer by using a bulldozer after the pond residues of a second layer are backfilled in the production area 1, and carrying out first pre-pressing on the production area 1 through a plastic drainage plate and pipe well drainage; by loading and prepressing the first stage of the production area 1, the plastic drainage plate can upwards discharge pore water in the soil foundation, the pipe well can discharge water in a deeper soil layer, the underground water level of the production area 1 and the water content of the deeper soil layer are further reduced, and a hard shell layer with a certain thickness is formed on a soft soil layer of the block;
e. during the first-stage loading prepressing waiting consolidation period in the production area 1, carrying out first-stage loading construction on the non-production area 2 through backfilling pond residues, and carrying out first prepressing on the non-production area 2 through a plastic drainage plate and pipe well drainage; like the first-stage loading prepressing of the production area 1, the water in the soil layer is discharged through the plastic drainage plates and the pipe wells by carrying out the first-stage loading prepressing on the non-production area 2, so that the underground water level and the water content of the deeper soil layer of the non-production area 2 are further reduced, and the soft soil layer of the block is formed into a hard shell layer with a certain thickness;
f. when the production area 1 meets the second-stage loading condition, the second-stage loading is carried out by backfilling a second layer of pond residues in a manner consistent with the first-stage loading construction mode, and combined prepressing is carried out by a plastic drainage plate and pipe well drainage after the loading is finished; carrying out combined prepressing by further secondary loading and matching with a plastic drainage plate and pipe well drainage, and further reducing the water content in the soil layer of the production area 1; after the second-stage loading prepressing of the production area 1, carrying out static sounding, and measuring whether pore water in a soil layer of the area is basically upwards discharged through a plastic drainage plate or not after the second-stage loading prepressing, whether water in an underground water level and a deeper soil layer is discharged out of the ground through a pipe well or not, and whether the bottom of the soil layer is fully consolidated or not and the expected effect is achieved;
g. after the production area 1 meets the unloading condition, a small-range dynamic drainage consolidation test is firstly carried out, after the test is successful, the whole production area 1 is unloaded, redundant earthwork is unloaded and moved to the non-production area 2, the non-production area 2 is subjected to second-stage loading prepressing, and dynamic drainage consolidation construction is immediately carried out after the production area 1 is unloaded; the dynamic drainage consolidation strengthens the soft foundation, because of the complexity of the soil horizon of the foundation, the dynamic consolidation theory is still imperfect to develop, the influence factor is very complicated and various, especially strengthen the silt clay with high water content and compressibility, according to the existing norm, adopt the local test before the large-area treatment; after the production area 1 meets the unloading condition, a small-range power drainage consolidation test is firstly carried out, whether the area reaches the expected bearing capacity or not is measured after the test is successful, the redundant earthwork in the production area 1 is unloaded and moved to the non-production area 2, a second-stage loading is formed on the non-production area 2, and the water content in the soil layer in the non-production area 2 is further reduced through combined pre-pressing formed by drainage of the plastic drainage plates, pipe well precipitation and the first-stage loading; immediately performing power drainage consolidation construction after unloading the production area 1 so as to avoid reduction of the bearing capacity of the production area 1 caused by overlong time;
h. the production area 1 is pre-inspected and pile test construction is started;
i. after the second pre-pressing is carried out on the non-production area 2 to reach the unloading condition, a small-range power drainage consolidation test is firstly carried out, after the test is successful, the whole non-production area 2 is unloaded and redundant earthwork is unloaded to the greening area 3, and the non-production area 2 starts to carry out power drainage consolidation construction; before unloading, the non-production area 2 needs to be subjected to static sounding as the production area 1, and after the requirement is met, a small-range power drainage consolidation test is carried out, and after the test is successful, unloading operation of the whole area can be carried out;
j. after the greening area 3 is backfilled in place, full tamping or vibration rolling treatment is carried out;
k. and (5) checking and accepting after construction is finished.
In the embodiment, the thickness of the first layer of pond residues backfilled in the step d is 5 m.
In the embodiment, the thickness of the backfilled pond residues in the step e is 2.2 m.
In the embodiment, the thickness of the second layer of pond residues backfilled in the step f is 3 m.
In this embodiment, the dynamic drainage consolidation in step g and step i is dynamic compaction or vibratory rolling.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. A large-area silt soft soil foundation hardening treatment method is characterized by comprising the following steps: according to different use functions of the ground, the ground is reasonably divided into a greening area and a non-greening area, wherein the non-greening area is divided into a production area and a non-production area, different ground treatment methods are adopted for different blocks, and the whole ground treatment steps are as follows:
a. leveling a field, measuring and paying off, and reasonably partitioning the field according to the use function of the field;
b. inserting a plastic drainage plate in the foundation and installing a monitoring device;
c. arranging a pipe well in the foundation to prepare for later-stage pipe well drainage;
d. carrying out first-stage loading on the production area through backfilling pond residues, flattening the pond residues of a first layer in the production area by using a bulldozer after the pond residues of a second layer are backfilled, and carrying out first prepressing on the production area through a plastic drainage plate and a pipe well for drainage;
e. during the first-stage loading prepressing waiting consolidation period in the production area, carrying out first-stage loading construction on the non-production area through backfilling pond residues, and carrying out first prepressing on the non-production area through a plastic drainage plate and pipe well drainage;
f. when the production area meets the second-stage loading condition, the second-stage loading is carried out by backfilling a second layer of pond residues in accordance with the first-stage loading construction mode, and combined prepressing is carried out by a plastic drainage plate and pipe well drainage after the loading is finished;
g. after the unloading condition is met in the production area, a small-range dynamic drainage consolidation test is firstly carried out, after the test is successful, the whole production area is unloaded, redundant earthwork is unloaded and moved to a non-production area, the non-production area is subjected to second loading and prepressing, and dynamic drainage consolidation construction is immediately carried out after the production area is unloaded;
h. pre-checking a production area and starting pile test construction;
i. after the second pre-pressing is carried out in the non-production area to reach the unloading condition, a small-range power drainage consolidation test is carried out, after the test is successful, the whole non-production area is unloaded, redundant earthwork is unloaded to the greening area, and the power drainage consolidation construction is carried out in the non-production area;
j. after the greening area is backfilled in place, full ramming or vibration rolling treatment is carried out;
k. and (5) checking and accepting after construction is finished.
2. The method for hardening the large-area sludge soft soil foundation according to claim 1, wherein the method comprises the following steps: and d, backfilling the first layer of pond residues in the step d to the thickness of 5 m.
3. The method for hardening the large-area sludge soft soil foundation according to claim 1, wherein the method comprises the following steps: and e, the thickness of the backfilled pond residues in the step e is 2.2 m.
4. The method for hardening the large-area sludge soft soil foundation according to claim 1, wherein the method comprises the following steps: and f, backfilling the second layer of pond residues in the step f to a thickness of 3 m.
5. The method for hardening the large-area sludge soft soil foundation according to claim 1, wherein the method comprises the following steps: and the dynamic drainage consolidation construction in the step g and the step i is dynamic compaction or vibration rolling.
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| CN103122631A (en) * | 2013-02-01 | 2013-05-29 | 叶吉 | Soft soil foundation preloading stamping reinforcement method |
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| US4981399A (en) * | 1989-11-20 | 1991-01-01 | Byongmu Song | Method and apparatus for increasing bearing capacity of soft soil and constructing cutoff wall |
| CN101225656B (en) * | 2008-01-31 | 2010-09-15 | 中交第四航务工程局有限公司 | Method for rapidly reinforcing ultra-soft soil superficial layer |
| CN101967819B (en) * | 2009-07-27 | 2012-05-30 | 上海艾能电力工程有限公司 | Forced ramming displacement synthetic method for construction of soft soil foundations of transformer substations |
| CN102251456B (en) * | 2011-06-02 | 2012-06-06 | 浙江方远建材科技有限公司 | Ecological permeable stratal configuration |
| CN102720180A (en) * | 2011-12-14 | 2012-10-10 | 汪文彬 | Soft foundation treatment method employing 'cutting drainage deep-layer preloading and dynamic consolidating' |
| 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 |
| CN103711114A (en) * | 2012-10-08 | 2014-04-09 | 中国石油化工集团公司 | Foundation treatment method |
| CN104088208B (en) * | 2014-07-15 | 2016-02-10 | 济南市市政工程设计研究院（集团）有限责任公司 | A kind of wet and soft earth foundation processing method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102817354A (en) * | 2012-08-31 | 2012-12-12 | 宝钢工程技术集团有限公司 | Method for dredging soft foundation by dredger fill and reinforcement |
| CN102817354B (en) * | 2012-08-31 | 2014-10-01 | 宝钢工程技术集团有限公司 | Method for dredging soft foundation by dredger fill and reinforcement |
| CN103122631A (en) * | 2013-02-01 | 2013-05-29 | 叶吉 | Soft soil foundation preloading stamping reinforcement method |
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