CN103031835A - Method for increasing foundation bearing capacity - Google Patents
Method for increasing foundation bearing capacity Download PDFInfo
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- CN103031835A CN103031835A CN2012105862763A CN201210586276A CN103031835A CN 103031835 A CN103031835 A CN 103031835A CN 2012105862763 A CN2012105862763 A CN 2012105862763A CN 201210586276 A CN201210586276 A CN 201210586276A CN 103031835 A CN103031835 A CN 103031835A
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- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention discloses a method for increasing the foundation bearing capacity. The method is characterized in that a vacuum preloading technology and a grouting technology are organically integrated, a vacuum state is formed in the stratum of a soft soil foundation by utilizing a vacuum pump in a vacuum water draining system, the technical condition of vacuum preloading is reached through controlling the vacuum degree of the stratum, and prepared grout is grouted in the stratum in a reasonable time; on one hand, the stratum negative pressure caused by vacuum is fully utilized, the grout can be more easily permeated in the stratum within a control time, the space occupied by stratum pore water (the stratum pore water is drained due to vacuum water draining) is filled, the strength is increased after concretion consolidation, thus the bearing capacity of the soft soil foundation is effectively increased, the consolidation settlement amount caused by the vacuum water loss can be simultaneously reduced, the consolidation rate can be effectively quickened, and the processing rate can be increased; and on the other hand, the vacuum state in the stratum is utilized, thus the grout can be conveniently permeated in the stratum, and the energy consumption is reduced.
Description
Technical field
The present invention relates to a kind of foundation treatment technology, especially relate to a kind of method that improves bearing capacity of foundation soil, the method is applicable to process the on a large scale soft foundation such as polder saturated dredger soft soil, training of river channel mud.
Background technology
The characteristics of the soft base of polder are that water content is large, and soil body particle is thin, and are mobile strong, are main mainly with mucky soil, and engineering properties is relatively poor.The self property of weak soil has determined that it could be as the ground of engineering construction after need to passing through consolidation process.
Present existing a lot of methods that improve load-carrying capacity of soft soil foundations, but because polder zone area is large, processing requirements is high, a lot of existing soft-soil foundation treatment methods are difficult to solve the problem such as the soft base of polder etc.At present, the common method for the treatment of the soft base of polder is mainly vacuum method, although the method treatment effeciency is higher, treatment effect is often very poor, is difficult to reach the foundation condition of the higher road of engine request, middle-high building thing, heavy factory building, warehouse district etc.; On the other hand, the time of the method Ground Treatment is longer, affects the development rate in later stage, and cost is high.
Summary of the invention
Technical problem to be solved by this invention provides a kind of method that improves bearing capacity of foundation soil, and the method treatment effeciency is high, and can effectively improve foundation strength.
The present invention solves the problems of the technologies described above the technical scheme that adopts: a kind of method that improves bearing capacity of foundation soil is characterized in that may further comprise the steps:
1. in pending soft foundation, make up low-pressure drainage system and grouting system, then lay one deck on the surface of pending soft foundation and cover bed course, cover thin film at the covering bed course again;
The bearing capacity that 2. will reach according to the ground after the consolidation process is selected grouting agent, then makes slurries;
3. utilizing vacuum method by low-pressure drainage system soft foundation to be carried out draining processes, the settling amount of relative pressure in drainage procedure in the Real-Time Monitoring low-pressure drainage system, the water yield of discharging from soft foundation, soft foundation every day is so that the time started of controlled grouting;
4. when the relative pressure in the grouting system be less than or equal to-during 30kPa or when the settling amount of soft foundation every day surpasses 10mm, in soft foundation, pour into slurries by grouting system;
5. when the relative pressure in the grouting system is 0Pa, stop grouting; Relative pressure in the post-grouting system that stops to be in the milk descends, and pours into slurries by grouting system in soft foundation again when the relative pressure in the grouting system no longer descends in this decline process;
6. repeating step filling process 5. until the relative pressure in the post-grouting system that stops to be in the milk no longer descends, finishes filling process.
Described step detailed process 1. is:
1.-1, the structure of low-pressure drainage system: plug many row's vertical drainage plates in pending soft foundation, every row's vertical drainage plate comprises a plurality of vertical drainage plates; Then lay many horizontal drain pipes on the surface of pending soft foundation, every horizontal drain pipe forms drainage channel with many row's vertical drainage plates; On many horizontal drain pipes, jointly connect again a vacuum pump that is used for the water and air of discharge soft foundation;
1.-2, the structure of grouting system: in pending soft foundation, plug many vertical grout pipes, spacing when plugging vertical grout pipe between each vertical drainage plate of every vertical grout pipe of requirement and its periphery is equidistantly, and requires to be positioned at along a plurality of grout outlets of its axial distribution on the every vertical grout pipe middle and lower part of pending soft foundation; Then lay many plasm pouring in plane pipes on the surface of pending soft foundation, and make the plasm pouring in plane pipe formation grouting channel that is connected with many vertical grout pipes; Be connected a pressure vacuum gauge that is used for measuring the relative pressure in the grouting system at the plasm pouring in plane pipe with the link of vertical grout pipe again; Last jointly on the grouting mouth of many plasm pouring in plane pipes connect a grouting valve, connect a grouting tank that is used for filling slurries at the slurries arrival end of each grouting valve;
1.-3, lay one deck on the surface of pending soft foundation and cover bed course, and make and cover bed course and cover all horizontal drain pipes and all plasm pouring in plane pipes;
1.-4, cover thin film covering bed course, and the edge of film is carried out encapsulation process form vacuum state under the film.
In the building process of described low-pressure drainage system, the spacing between adjacent two described vertical drainage plates is 0.9m～1.5m.
The thickness of the described covering bed course of described step in 1.-3 be more than or equal to 2 times of the external diameter of described horizontal drain pipe or described plasm pouring in plane pipe or more than; Described covering bed course is for adopting sand to cover bed course as the sand that material forms.
Described step is covering on the bed course before the cover film in 1.-4, offers the degree of depth greater than the trench of 1m around the processing region on the surface of pending soft foundation, is used for the border as the edge seal of film.
The described step 2. selection course of middle grouting agent is: if the bearing capacity that the foundation requirement after the consolidation process reaches is more than or equal to 60kN/m
2And be less than or equal to 70kN/m
2, then select high strength clay class grouting agent; If the bearing capacity that the foundation requirement after the consolidation process reaches is greater than 70kN/m
2, then select cement-based grouting material.
Described cement-based grouting material is cement-fly ash or cement-slag mixture.
Compared with prior art, the invention has the advantages that: the inventive method has organically combined technique of soft soil foundation treatment and grouting technique, utilize the vacuum pump in the low-pressure drainage system, in the stratum of soft foundation, form vacuum state, then by the vacuum in the control stratum, reach the technical condition of vacuum preloading, begin in the stratum, to pour into the slurries that configure at reasonable time again, on the one hand, owing to take full advantage of the stratum negative pressure that vacuum causes, slurries are penetrated in the stratum within the control time relatively easily, filled by the occupied space of formation pore water (because vacuum drainage runs off), improved intensity through solidifying after fixed, thereby effectively improved the bearing capacity of soft foundation, simultaneously can reduce the consolidation settlement that stratum vacuum dehydration causes, and can effectively accelerate consolidation rate, improve treatment effeciency; On the other hand, owing to utilized vacuum state in the stratum, so slurries can penetrate in the stratum easily, have reduced energy consumption.In addition, the inventive method can be used for processing the ground of any character, and for the large-scale soft foundation such as polder saturated dredger soft soil, training of river channel mud, treatment effect is particularly remarkable.
Description of drawings
Fig. 1 is the laying schematic diagram one of low-pressure drainage system and grouting system in the inventive method;
Fig. 2 is the laying schematic diagram two of low-pressure drainage system and grouting system in the inventive method.
The specific embodiment
Embodiment is described in further detail the present invention below in conjunction with accompanying drawing.
A kind of method that improves bearing capacity of foundation soil that the present invention proposes, it organically combines technique of soft soil foundation treatment and soft basic grouting technique, and it specifically may further comprise the steps:
1. as shown in the figure, in pending soft foundation 1, make up low-pressure drainage system and grouting system, then lay one deck on the surface of pending soft foundation 1 and cover bed course 2, covering bed course 2 covering thin films 3 again.The detailed process of this step is:
1.-1, the structure of low-pressure drainage system: as shown in the figure, plug many row's vertical drainage plates in pending soft foundation 1, every row's vertical drainage plate comprises a plurality of vertical drainage plates 41; Then lay many horizontal drain pipes 42 on the surface of pending soft foundation 1, every horizontal drain pipe 42 is connected with at least one row's vertical drainage plate; On the drain pipe port of many horizontal drain pipes 42, jointly connect again a vacuum pump 43 that is used for the water and air of discharge soft foundation 1.Suppose in pending soft foundation, to be inserted with eight row's vertical drainage plates, and every row's vertical drainage plate comprises ten vertical drainage plates, then can lay many horizontal drain pipes, and a horizontal drain pipe can connect and compose a drainage channel with many rows vertical drainage plate, suppose to be laid with four horizontal drain pipes, then can make every horizontal drain pipe and two row's vertical drainage plates connect and compose a drainage channel, again according to the vacuum pump of selecting, can with two horizontal drain pipes as vacuum pump of the common connection of a unit, so just need two vacuum pumps.
At this, because the inventive method has been introduced grouting technique, and adopted with no pressure grouting, therefore the spacing between the vertical drainage plate that can keep arranging in the existing technique of soft soil foundation treatment of the spacing between adjacent two vertical drainage plates, the spacing between can adjacent two vertical drainage plates is set to 0.9m～1.5m.And in actual the procedures of establishment, can determine spacing between adjacent two vertical drainage plates according to the transmission coefficient of soft foundation, the transmission coefficient of soft foundation hour generally speaking, spacing between adjacent two vertical drainage plates is also programmable relatively a little bit smaller, such as transmission coefficient hour, spacing can be designed to 0.9m, and when transmission coefficient was larger, spacing can be designed to 1.5m.
1.-2, the structure of grouting system: as shown in the figure, in pending soft foundation 1, plug many vertical grout pipes 51, spacing when plugging vertical grout pipe 51 between each vertical drainage plate 41 of every vertical grout pipe 51 of requirement and its periphery is for equidistant, if namely waiting to plug the periphery of the position of vertical grout pipe 51 has and is four vertical drainage plates 41 that square is arranged, then require this vertical grout pipe 51 to be plugged on the center of four vertical drainage plates 41, if wait to plug the periphery of the position of vertical grout pipe 51 three vertical drainage plates 41 of arranging triangular in shape are arranged, then require this vertical grout pipe 51 to be plugged on the center of three vertical drainage plates 41, and require to be positioned at along a plurality of grout outlets of its axial distribution on the every vertical grout pipe 51 middle and lower part of pending soft foundation 1, can fully improve the intensity of the middle and lower part of soft foundation like this; Then lay many plasm pouring in plane pipes 52 on the surface of pending soft foundation 1, and make a plasm pouring in plane pipe 52 formation grouting channel that is connected with many vertical grout pipes 51; Be connected a pressure vacuum gauge 53 that is used for measuring the relative pressure in the vertical grout pipe 51 at plasm pouring in plane pipe 52 with the link of vertical grout pipe 51 again; Last jointly on the grouting mouth of many plasm pouring in plane pipes 52 connect a grouting valve 54, connect a grouting tank 55 that is used for filling slurries at the slurries arrival end of each grouting valve 54.Suppose in pending soft foundation, to be inserted with eight row's vertical drainage plates, and every row's vertical drainage plate comprises ten vertical drainage plates, then can between four adjacent vertical drainage plates of per two rows, plug a vertical grout pipe, the vertical grout pipe of seven rows is arranged like this, and the vertical grout pipe of every row comprises nine vertical grout pipes, can lay so many plasm pouring in plane pipes, and a plasm pouring in plane pipe can connect and compose a grouting channel with the vertical grout pipe of many rows, suppose to be laid with three plasm pouring in plane pipes, then can making wherein, two plasm pouring in plane pipes connect and compose two grouting channel with the vertical grout pipe of two rows respectively, the 3rd remaining vertical grout pipe of three rows of plasm pouring in plane Guan Keyu connects and composes a grouting channel, again two plasm pouring in plane pipes are connected a grouting valve jointly as a unit, another root plasm pouring in plane pipe connects a grouting valve as a unit, so just need two grouting valves, the slurries arrival end of each grouting valve connects a grouting tank that is used for filling slurries.
In the practice of construction process, when plugging vertical grout pipe 51, can vertical grout pipe 51 be plugged on the centre position of a plurality of vertical drainage plates 41 according to range estimation, the pitch difference between the vertical grout pipe 51 that makes insertion and each vertical drainage plate 41 of its periphery is consistent getting final product seldom.
At this, pressure vacuum gauge 53 generally is connected on the link of vertical grout pipe 51 and plasm pouring in plane pipe 52, in the practice of construction process, pressure vacuum gauge 53 can be connected in the slurries entrance of vertical grout pipe 51, this is because in the practice of construction process, the slurries amount of inculcating is large and the slurries fed distance is far away, simultaneously different project situation there are differences, carry in the way to have pressure loss, therefore vertically the relative pressure of the slurries entrance of grout pipe as control criterion.
1.-3, as shown in the figure, lay one deck on the surface of pending soft foundation 1 and cover bed course 2, and make covering bed course 2 cover all horizontal drain pipes 42 and all plasm pouring in plane pipes 52.
In this specific embodiment, if each vertical drainage plate 41 be in the same place with horizontal drain pipe 42 binds of its formation drainage channel, then the water major part of each vertical drainage plate 41 discharges directly enters in the horizontal drain pipe 42, and then a plurality of water inlets along its axial distribution enter in the horizontal drain pipe 42 fraction water on bed course 2 and the horizontal drain pipe 42 by covering; If each vertical drainage plate 41 with the horizontal drain pipe 42 of its formation drainage channel not bind be in the same place, then all a plurality of water inlets along its axial distribution enter in the horizontal drain pipe 42 water of each vertical drainage plate 41 discharges on bed course 2 and the horizontal drain pipe 42 by covering, and cover the effect that bed course 2 has played infiltration at this; Simultaneously, cover horizontal drain pipe 42 and plasm pouring in plane pipe 52 with covering bed course 2, can prevent that horizontal drain pipe 42 and plasm pouring in plane pipe 52 from poking film 3, cover the effect that bed course 2 has played protective film 3 at this.
In this specific embodiment, covering bed course 2 generally can select sand to form sand covering bed course as material, it is not only economical that sand covers bed course, and permeability performance is good, certainly in the practice of construction process, also can adopt mud or haydite to form as material and cover bed course, but it is poor than the permeability performance that sand covers bed course that mud covers the permeability performance of bed course, and haydite covers the price comparison height of bed course.
In this specific embodiment, the thickness that require to cover bed course 2 be more than or equal to 2 times of the external diameter of horizontal drain pipe 42 or plasm pouring in plane pipe 52 or more than, so just the effective ensuring coverage bed course 2 of energy cover horizontal drain pipe 42 and plasm pouring in plane pipe 52 fully.
1.-4, around the processing region on the surface of pending soft foundation 1, offer the degree of depth greater than the trench 6 of 1m, then covering bed course 2 covering thin films 3, as shown in the figure, and utilize trench 6 as the border of the edge seal of film 3 edge of film 3 to be carried out encapsulation process to form vacuum state under the film.
In the practice of construction process, it is too shallow that trench 6 should not dig, because if too shallow, then the edge of film 3 is run out of easily, so just can't guarantee to be in vacuum state under the film.
The bearing capacity that 2. will reach according to the ground after the consolidation process, then the grouting agent of selection economical rationality makes slurries.
At this, because the general organic content of tidal land barged-in fill is high, utilize that bearing capacity of foundation soil after vacuum method is processed is not high (generally to be lower than 60kN/m
2), therefore according to the purposes of the ground after the consolidation process (such as: as stockyard, road foundation, park, land use for greening etc.), select suitable grouting agent.For requiring not too high ground (more than or equal to 60kN/m as park, land use for greening equivalent-load power
2And be less than or equal to 70kN/m
2), can select high strength clay class grouting agent; For the ground of having relatively high expectations as stockyard, road foundation equivalent-load power (greater than 70kN/m
2), the optional cement-based grouting material of using is such as cement-fly ash, cement-slag mixture etc.
At this, prior art is adopted in the preparation of slurries, and the configuration proportion of slurries can be determined according to actual conditions.
3. utilizing existing vacuum method by low-pressure drainage system soft foundation to be carried out draining processes, the settling amount of relative pressure in drainage procedure in the Real-Time Monitoring low-pressure drainage system, the water yield of discharging from soft foundation, soft foundation every day is so that the time started of grouting valve grouting is opened in control.
4. the relative pressure when the link place of the vertical grout pipe in the grouting system and plasm pouring in plane pipe be less than or equal to-during 30kPa, in soft foundation, pour into slurries by the grouting tank in the grouting system, grouting valve, plasm pouring in plane pipe and vertical grout pipe; But when the settling amount of soft foundation begins to accelerate when the settling amount of soft foundation every day surpasses 10mm, even the relative pressure at vertical grout pipe and the link place of plasm pouring in plane pipe greater than-30kPa also should by the grouting tank in the grouting system, grouting valve, plasm pouring in plane pipe and vertically grout pipe in soft foundation, pour into slurries.
5. in the time can't pouring into slurries when the relative pressure at the link place of the vertical grout pipe in the grouting system and plasm pouring in plane pipe is 0Pa, close the grouting valve and stop grouting; The relative pressure at the vertical grout pipe in the post-grouting system that stops to be in the milk and the link place of plasm pouring in plane pipe can descend, when the relative pressure at the link place of the vertical grout pipe in the grouting system and plasm pouring in plane pipe no longer descends in this decline process, namely open the grouting valve by grouting system again and in soft foundation, pour into slurries.
6. repeating step filling process 5. until the relative pressure at the link place of the vertical grout pipe in the post-grouting system that stops to be in the milk and plasm pouring in plane pipe no longer descends, finishes filling process.
Claims (7)
1. method that improves bearing capacity of foundation soil is characterized in that may further comprise the steps:
1. in pending soft foundation, make up low-pressure drainage system and grouting system, then lay one deck on the surface of pending soft foundation and cover bed course, cover thin film at the covering bed course again;
The bearing capacity that 2. will reach according to the ground after the consolidation process is selected grouting agent, then makes slurries;
3. utilizing vacuum method by low-pressure drainage system soft foundation to be carried out draining processes, the settling amount of relative pressure in drainage procedure in the Real-Time Monitoring low-pressure drainage system, the water yield of discharging from soft foundation, soft foundation every day is so that the time started of controlled grouting;
4. when the relative pressure in the grouting system be less than or equal to-during 30kPa or when the settling amount of soft foundation every day surpasses 10mm, in soft foundation, pour into slurries by grouting system;
5. when the relative pressure in the grouting system is 0Pa, stop grouting; Relative pressure in the post-grouting system that stops to be in the milk descends, and pours into slurries by grouting system in soft foundation again when the relative pressure in the grouting system no longer descends in this decline process;
6. repeating step filling process 5. until the relative pressure in the post-grouting system that stops to be in the milk no longer descends, finishes filling process.
2. a kind of method that improves bearing capacity of foundation soil according to claim 1 is characterized in that described step detailed process 1. is:
1.-1, the structure of low-pressure drainage system: plug many row's vertical drainage plates in pending soft foundation, every row's vertical drainage plate comprises a plurality of vertical drainage plates; Then lay many horizontal drain pipes on the surface of pending soft foundation, every horizontal drain pipe forms drainage channel with many row's vertical drainage plates; On many horizontal drain pipes, jointly connect again a vacuum pump that is used for the water and air of discharge soft foundation;
1.-2, the structure of grouting system: in pending soft foundation, plug many vertical grout pipes, spacing when plugging vertical grout pipe between each vertical drainage plate of every vertical grout pipe of requirement and its periphery is equidistantly, and requires to be positioned at along a plurality of grout outlets of its axial distribution on the every vertical grout pipe middle and lower part of pending soft foundation; Then lay many plasm pouring in plane pipes on the surface of pending soft foundation, and make the plasm pouring in plane pipe formation grouting channel that is connected with many vertical grout pipes; Be connected a pressure vacuum gauge that is used for measuring the relative pressure in the grouting system at the plasm pouring in plane pipe with the link of vertical grout pipe again; Last jointly on the grouting mouth of many plasm pouring in plane pipes connect a grouting valve, connect a grouting tank that is used for filling slurries at the slurries arrival end of each grouting valve;
1.-3, lay one deck on the surface of pending soft foundation and cover bed course, and make and cover bed course and cover all horizontal drain pipes and all plasm pouring in plane pipes;
1.-4, cover thin film covering bed course, and the edge of film is carried out encapsulation process form vacuum state under the film.
3. a kind of method that improves bearing capacity of foundation soil according to claim 2 is characterized in that in the building process of described low-pressure drainage system, and the spacing between adjacent two described vertical drainage plates is 0.9m～1.5m.
4. a kind of method that improves bearing capacity of foundation soil according to claim 3, the thickness that it is characterized in that the described covering bed course during described step 1.-3 for more than or equal to 2 times of the external diameter of described horizontal drain pipe or described plasm pouring in plane pipe or more than; Described covering bed course is for adopting sand to cover bed course as the sand that material forms.
5. a kind of method that improves bearing capacity of foundation soil according to claim 4, it is characterized in that during described step 1.-4 covering on the bed course before the cover film, around the processing region on the surface of pending soft foundation, offer the degree of depth greater than the trench of 1m, be used for the border as the edge seal of film.
6. each described a kind of method that improves bearing capacity of foundation soil in 5 according to claim 1 is characterized in that the selection course of grouting agent was during described step 2.: if the bearing capacity that the foundation requirement after the consolidation process reaches is for more than or equal to 60kN/m
2And be less than or equal to 70kN/m
2, then select high strength clay class grouting agent; If the bearing capacity that the foundation requirement after the consolidation process reaches is greater than 70kN/m
2, then select cement-based grouting material.
7. a kind of method that improves bearing capacity of foundation soil according to claim 6 is characterized in that described cement-based grouting material is cement-fly ash or cement-slag mixture.
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| CN103336105A (en) * | 2013-06-18 | 2013-10-02 | 浙江工业大学 | Soft foundation treatment experiment device and method |
| CN104452740A (en) * | 2014-11-21 | 2015-03-25 | 淮海工学院 | Method for reinforcing and treating liquefied sandy soil foundation |
| CN105239556A (en) * | 2015-10-14 | 2016-01-13 | 水利部交通运输部国家能源局南京水利科学研究院 | Method for processing super-soft soil foundation through one time of plate insertion sealing and two times of suction vacuumizing water drainage |
| CN106869109A (en) * | 2017-03-30 | 2017-06-20 | 吴慧明 | A kind of aerosol generating device supporting for soft soil foundation disturbance treatment operation |
| CN107255705A (en) * | 2017-07-24 | 2017-10-17 | 河海大学 | Microorganism grouting test device and test method for uniform curing silt |
| CN108824113A (en) * | 2018-07-20 | 2018-11-16 | 四川瑞通工程建设集团有限公司 | A kind of soft-soil foundation treatment method |
| CN109778826A (en) * | 2019-01-29 | 2019-05-21 | 程桂香 | A kind of construction of soft soil treatment method based on Novel foam concrete |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103336105A (en) * | 2013-06-18 | 2013-10-02 | 浙江工业大学 | Soft foundation treatment experiment device and method |
| CN103336105B (en) * | 2013-06-18 | 2015-03-25 | 浙江工业大学 | Soft foundation treatment experiment device and method |
| CN104452740A (en) * | 2014-11-21 | 2015-03-25 | 淮海工学院 | Method for reinforcing and treating liquefied sandy soil foundation |
| CN105239556A (en) * | 2015-10-14 | 2016-01-13 | 水利部交通运输部国家能源局南京水利科学研究院 | Method for processing super-soft soil foundation through one time of plate insertion sealing and two times of suction vacuumizing water drainage |
| CN106869109A (en) * | 2017-03-30 | 2017-06-20 | 吴慧明 | A kind of aerosol generating device supporting for soft soil foundation disturbance treatment operation |
| CN107255705A (en) * | 2017-07-24 | 2017-10-17 | 河海大学 | Microorganism grouting test device and test method for uniform curing silt |
| CN107255705B (en) * | 2017-07-24 | 2023-07-21 | 河海大学 | Microbial grouting test device and method for uniformly curing silt |
| CN108824113A (en) * | 2018-07-20 | 2018-11-16 | 四川瑞通工程建设集团有限公司 | A kind of soft-soil foundation treatment method |
| CN109778826A (en) * | 2019-01-29 | 2019-05-21 | 程桂香 | A kind of construction of soft soil treatment method based on Novel foam concrete |
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|---|---|
| CN103031835B (en) | 2014-11-12 |
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