CN112030936A - Construction method for treating soft soil foundation of hydraulic reclamation project - Google Patents
Construction method for treating soft soil foundation of hydraulic reclamation project Download PDFInfo
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- CN112030936A CN112030936A CN202010922890.7A CN202010922890A CN112030936A CN 112030936 A CN112030936 A CN 112030936A CN 202010922890 A CN202010922890 A CN 202010922890A CN 112030936 A CN112030936 A CN 112030936A
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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
Abstract
The invention relates to a construction method for treating a soft soil foundation of a hydraulic filling project. The method comprises the following steps of (1) measuring site elevation and paying off; (2) excavating a temporary drainage ditch; (3) disturbing and rolling, namely, inserting a backhoe of a backhoe type land and water excavator into the soil layer to a certain depth, then shaking for vibration, and then rolling the construction area by the land and water excavator or a bulldozer in sections; (4) airing and draining the field; (5) a step of establishing a drainage system; (6) laying light well points; (7) a step of precipitation; (8) turning the earthwork outwards and transporting the earthwork; (9) carrying out secondary precipitation on the light well point and the pipe well; (10) dynamic compaction; (11) and detecting the bearing capacity. The construction method provided by the invention has the advantages that the processing capacity of the soft soil foundation is improved, the water content of the soft soil foundation is quickly and effectively reduced, the bearing capacity of the soft soil foundation is improved, and the smooth proceeding of subsequent construction is ensured.
Description
Technical Field
The invention belongs to the technical field of hydraulic reclamation engineering, and particularly relates to a construction method for treating a soft soil foundation of the hydraulic reclamation engineering.
Background
In the hydraulic filling construction engineering, the treatment of a soft soil foundation is usually involved, and the soft soil foundation treatment is a front foundation of the subsequent engineering. The hydraulic reclamation land area is obtained by hydraulic reclamation construction engineering, wherein the hydraulic reclamation construction engineering is to hydraulically fill water-containing slurry into a hydraulic reclamation area defined by a cofferdam, discharge water and settle the slurry. The characteristics of the hydraulic filling construction determine that the formed hydraulic filling land area has the following characteristics: the soil is usually silt soil mixed with silt clay and silt clay; the water content is high, the water content is in a saturated state, and the bearing capacity is low; the method has the difficult technical problems that open water and pore water are discharged, the surface layer bearing capacity does not meet the passing conditions of earthwork equipment and vehicles, and the like. Due to the characteristics, construction such as subsequent site leveling and elevation reduction cannot follow in time by taking 'surface cleaning (namely foundation surface layer cleaning)' as a front process, and under the condition that the construction period is short, if the soft soil foundation is not properly treated, subsequent engineering cannot be smoothly carried out, so that the construction cost of engineering projects is increased, and the construction efficiency is reduced.
Therefore, effective treatment of the soft soil foundation obtained in the hydraulic filling construction project becomes the key of the project. By applying a reasonable construction process to the soft soil foundation, the water content of the soft soil foundation is reduced, and meanwhile, the bearing capacity of the soft soil foundation is improved, so that the method has a positive effect on subsequent construction. The subsequent construction is smoothly performed by reasonably disposing the soft soil foundation, so that the cost is reduced, and the method also becomes one of the key points of project management.
The existing soft soil foundation treatment process can be generally summarized as a method combining light well point drainage and natural drainage, and specifically comprises the following steps: a light well point is arranged on the soft soil foundation, the water in the foundation is discharged by adopting a mode of vacuumizing a pipeline of the well point, and the discharged water enters the pre-excavated side ditch to be naturally discharged.
The above treatment process has certain problems when applied to soft soil foundations formed in hydraulic fill land areas: the soil of the soft soil foundation obtained by hydraulic filling is silt-mixed mucky soil and silty clay, the number of interlayers is large, the division is uneven, and the water content is high, so that the open water and pore water/ultra-pore water in the soft soil foundation are difficult to discharge, namely the water content of the soft soil foundation is difficult to effectively reduce by adopting the existing construction process, the bearing capacity of the foundation is difficult to effectively improve, and the subsequent construction is greatly influenced.
Therefore, it is necessary to provide reasonable improvement to the treatment process of soft soil foundation in hydraulic filling engineering to solve the above technical problems.
Disclosure of Invention
The invention provides a construction method for treating a soft soil foundation of a hydraulic filling project for solving the technical problems in the prior art, which improves the treatment capacity of the soft soil foundation obtained by the hydraulic filling project, quickly and effectively reduces the water content of the soft soil foundation, quickly and effectively improves the bearing capacity of the soft soil foundation and ensures the smooth proceeding of subsequent construction.
The technical scheme adopted by the invention for solving the technical problems in the prior art is as follows: a construction method for treating a soft soil foundation of a hydraulic reclamation project comprises the following steps of (1) measuring the elevation of a site and setting off, wherein the elevation of the site to be treated is measured, the setting off is carried out according to the construction process requirement, and the positions of a vibration application point and a light well point are determined; (2) excavating a temporary drainage ditch, namely excavating the temporary drainage ditch in the field to be treated to discharge open water in the field; (3) disturbing and rolling, namely, inserting a back shovel of a back shovel type land and water excavator into the soil layer for a certain depth, then shaking for vibration, breaking the impervious layer and liquefying the silt layer, and then rolling the construction area by the land excavator or the bulldozer in sections; (4) a step of airing and draining the field, in which the field is stood and aired, and water drained in the step of disturbing and rolling is drained through a temporary drainage ditch; (5) a step of establishing a drainage system; (6) laying a light well point, namely laying the light well point and a related pipeline system in the field; (7) dewatering, namely enabling water in a soil layer to enter a light well point and a pipeline system thereof and enter a drainage system by vacuumizing the light well point; (8) turning the earthwork outwards and transporting the earthwork; (9) performing secondary precipitation by combining the light well point with the pipe well, arranging a precipitation pipe well in a field area, applying combined precipitation operation of light well point precipitation and pipe well precipitation to the field, and enabling water in a soil layer to enter a drainage system; (10) a step of dynamic compaction, which is to adopt a rammer device to carry out dynamic compaction operation on a construction area; (11) and detecting the bearing capacity, namely detecting the bearing capacity of the foundation and evaluating whether the engineering requirements are met.
The invention has the advantages and positive effects that: the invention provides a construction method for treating a soft soil foundation of a hydraulic filling project, and compared with the existing construction method, the construction method adopts a method of 'combining' shaking, vibrating and rolling of construction machinery and 'promoting pore water release by a light well point and a pipe well', so that soil consolidation drainage of the soft soil foundation is accelerated. Through adopting construction machinery to destroy the impervious bed in construction place and make the silt layer liquefaction, the cooperation rolls the effect, has guaranteed that the pore water in the soft soil foundation obtains effective and quick row of discharging. The light well point and the pipe well are combined to perform precipitation on the pore water/super pore water in the foundation, so that the bearing capacity of the soil body is rapidly improved. The construction method disclosed by the invention well solves the problem of pre-treatment of the near-saturation hydraulic filling soft soil foundation with silt and silt mixed with mucky soil and silty clay layers obtained in hydraulic filling engineering, improves the bearing capacity of the soft soil foundation, enables subsequent earthwork operation and dynamic compaction construction to be smoothly carried out, simultaneously strives for time for short construction period arrangement, reduces the cost of engineering projects and improves the benefits of the engineering projects.
Preferably: the step (1) is also preceded by a step of preparation before construction, in which the cleaning of the construction site, the parking of construction equipment and the preparation of construction materials are carried out.
Preferably: the distance between the vibration points determined in the step (1) is less than or equal to 2.0m, the light well points are arranged in a rectangular lattice mode, the transverse distance between every two adjacent light well points is 2.0m, and the longitudinal distance is 4.0 m.
Preferably: in the step (3), the depth of the back shovel type land and water excavator inserted into the soil layer is more than or equal to 1.5m, and the vibration retention time of each vibration application point is 2 min.
Preferably: the drainage system established in the step (5) comprises a drainage open channel and a drainage side channel which are communicated; the drainage open channels are arranged in the construction site and comprise a plurality of transverse open channels and longitudinal open channels, the drainage side channels are arranged on the outer side of the construction site, and the channel bottom elevation of each drainage open channel is excavated according to a certain slope ratio.
Preferably: the width of the open drainage channel is more than or equal to 4m, and the depth of the open drainage channel is 3-4 m.
Preferably: and (4) the light well point in the step (6) comprises a well pipe inserted into the soil layer of the site, wherein a filter screen is arranged at the lower end of the well pipe, four layers of 100-mesh nylon nets are selected as the filter screen, and the filter screen is bound and fixed at the lower end of the well pipe.
Preferably: in the step (8), the drainage side ditch is continuously excavated and deepened along with the earthwork construction, and the depth of the finally formed drainage side ditch is more than or equal to 4 m.
Preferably: the distance between the tube wells in the step (9) is 18-22 m, and the depth of the tube wells is 18-22 m.
Preferably: and (11) detecting the bearing capacity of the foundation by adopting a static sounding method.
Detailed Description
In order to further understand the contents, features and effects of the present invention, the following embodiments are described in detail.
The construction method for treating the soft soil foundation of the hydraulic filling engineering adopts the following principle:
the saturated silt is changed into a liquid-like state under the action of dynamic load due to the loss of original strength, and is a special phenomenon represented by the great sudden loss of strength. When vibration acts on the soil body, the soil body framework can be influenced by certain inertia force and interference force due to the vibration. They cause dynamic additional stresses on the individual grains of different sizes and directions, which, when exceeding a certain value, destroy the original connection strength and structural state between the grains of earth, leaving the grains of sand separated from each other. The effective pressure previously transmitted by the sand grains through their points of contact is transmitted to the pore water to take over, causing an abrupt increase in the pore water pressure. In this case, on the one hand, pore water is discharged upwards under a certain super-hydrostatic pressure, and on the other hand, soil particles tend to sink downwards under the action of gravity, so that the soil is in a suspended state within a certain time of structural failure, and the shear strength of the soil is reduced or lost. Then, as the pore water is gradually squeezed out, the pressure of the pore water is gradually reduced, the soil particles are gradually settled and rearranged, the pressure is transmitted to the soil particles by the pore water again to bear, and the sandy soil reaches a new stable state.
Therefore, the liquefaction phenomenon of the saturated sandy soil must simultaneously meet two basic conditions: (1) the vibration action is enough to damage the structure of the soil body; (2) after the soil structure is damaged, the soil particles tend not to be loose but to be compacted. The construction method of the invention fully utilizes the principle, applies dynamic load to the soft soil foundation, leads the saturated sandy soil to generate liquefaction, and accelerates the discharge of water in the soil body.
The invention utilizes the characteristic that saturated silt is easy to liquefy under the action of continuous vibration load, firstly adopts mechanical equipment to actively disturb soil and destroy a waterproof interlayer of the soil, improves a longitudinal drainage channel, and then liquefies and drains water by the continuous vibration load. Through many times of static sounding effect comparison, the bearing capacity of the surface layer of the foundation can be improved in a short time, and effective guarantee is provided for subsequent earthwork construction and foundation drainage consolidation.
The final scheme is as follows: the method of 'shaking, vibrating and rolling' combined with light well points to promote pore water release is adopted to accelerate soil consolidation drainage. Briefly stated as follows: firstly, inserting a back shovel of the amphibious excavator into a soil body for a certain depth, then shaking and vibrating to break a watertight layer and liquefy a silt layer; then, rolling the construction area in sections by adopting an amphibious excavator or a bulldozer, compacting and draining; and then laying light well points for dewatering, and combining with the pipe well for dewatering to promote the dissipation and release of pore water.
The construction method for treating the soft soil foundation of the hydraulic filling engineering adopts the following steps:
(1) measuring the elevation of a field to be processed, paying off according to the construction process requirement, and determining the positions of a vibration application point and a light well point;
before the step, a step of preparation before working is also included, and the cleaning of the construction site, the parking of construction equipment and the preparation operation of construction materials are carried out in the step.
In the step, the distance between the determined vibration points is less than or equal to 2.0m, the light well points are arranged in a rectangular lattice mode, the transverse distance between every two adjacent light well points is 2.0m, and the longitudinal distance is 4.0 m.
(2) Excavating a temporary drainage ditch, namely excavating the temporary drainage ditch in the field to be treated to discharge open water in the field;
(3) disturbing and rolling, namely, inserting a back shovel of a back shovel type land and water excavator into the soil layer for a certain depth, then shaking for vibration, breaking the impervious layer and liquefying the silt layer, and then rolling the construction area by the land excavator or the bulldozer in sections;
in this step, the depth of the backhoe type amphibious excavator inserted into the soil layer is more than or equal to 1.5m, preferably 1.5m, and the vibration-remaining time of each vibration-applying point is 2 min.
The spacing arrangement of the vibration application points and the vibration retention time of each vibration application point are obtained through experiments, and the experimental conditions are shown in table 1.
TABLE 1 static sounding effect table
As can be seen from Table 1, both the vibration remaining time and the vibration applying point spacing have influence on the test result, particularly the vibration applying point spacing is not more than 2m, and most vibration applying points can meet the requirements; according to the calculation of the on-site equipment capacity, the vibration-applying time is preferably 2min, if the vibration-applying time is too short, the vibration-applying effect is poor, and if the vibration-applying time is too long, the construction efficiency of the equipment is affected.
(4) A step of airing and draining the field, in which the field is stood and aired, and water drained in the step of disturbing and rolling is drained through a temporary drainage ditch;
(5) a step of establishing a drainage system;
in the step, the established drainage system comprises a drainage open channel and a drainage side channel which are communicated; the drainage open channels are arranged in the construction site and comprise a plurality of transverse open channels and longitudinal open channels, the drainage side channels are arranged outside the construction site, the elevation of the open channel bottom of each drainage open channel is excavated according to a certain slope ratio, and the drainage open channels with a certain slope ratio at the open channel bottom are favorable for forming self-flow and increasing the drainage efficiency. In the same way, the elevation of the bottom of the drainage side ditch should be excavated according to a certain slope ratio to form self-flow and increase the drainage efficiency.
Furthermore, the width of the drainage open channel is more than or equal to 4m, and the depth is 3-4 m.
In order to avoid collapse and siltation of the drainage system in the construction process, the well-established drainage system needs to be maintained frequently, and the drainage capacity of the drainage system is guaranteed.
(6) Laying a light well point, namely laying the light well point and a related pipeline system in the field;
in the step, the light well point comprises a well pipe inserted into a soil layer of the field, a filter screen is arranged at the lower end of the well pipe, four layers of 100-mesh nylon nets are selected as the filter screen, and the filter screen is bound and fixed at the lower end of the well pipe.
(7) Dewatering, namely enabling water in a soil layer to enter a light well point and a pipeline system thereof and enter a drainage system by vacuumizing the light well point;
(8) turning the earthwork outwards and transporting the earthwork;
in the step, the drainage side ditch is continuously excavated and deepened along with the earthwork construction, and the depth of the finally formed drainage side ditch is more than or equal to 4 m.
(9) Performing secondary precipitation by combining the light well point with the pipe well, arranging a precipitation pipe well in a field area, applying combined precipitation operation of light well point precipitation and pipe well precipitation to the field, and enabling water in a soil layer to enter a drainage system;
in the step, the distance between the tube wells is 18-22 m, preferably 20m, and the depth of the tube wells is 18-22 m, preferably 20 m.
(10) A step of dynamic compaction, which is to adopt a rammer device to carry out dynamic compaction operation on a construction area;
(11) and detecting the bearing capacity, namely detecting the bearing capacity of the foundation and evaluating whether the engineering requirements are met.
In the step, the bearing capacity of the foundation is detected by adopting a static sounding method.
Claims (10)
1. A construction method for treating a soft soil foundation of a hydraulic filling project is characterized by comprising the following steps: comprises the following steps of (a) carrying out,
(1) measuring the elevation of a field to be processed, paying off according to the construction process requirement, and determining the positions of a vibration application point and a light well point;
(2) excavating a temporary drainage ditch, namely excavating the temporary drainage ditch in the field to be treated to discharge open water in the field;
(3) disturbing and rolling, namely, inserting a back shovel of a back shovel type land and water excavator into the soil layer for a certain depth, then shaking for vibration, breaking the impervious layer and liquefying the silt layer, and then rolling the construction area by the land excavator or the bulldozer in sections;
(4) a step of airing and draining the field, in which the field is stood and aired, and water drained in the step of disturbing and rolling is drained through a temporary drainage ditch;
(5) a step of establishing a drainage system;
(6) laying a light well point, namely laying the light well point and a related pipeline system in the field;
(7) dewatering, namely enabling water in a soil layer to enter a light well point and a pipeline system thereof and enter a drainage system by vacuumizing the light well point;
(8) turning the earthwork outwards and transporting the earthwork;
(9) performing secondary precipitation by combining the light well point with the pipe well, arranging a precipitation pipe well in a field area, applying combined precipitation operation of light well point precipitation and pipe well precipitation to the field, and enabling water in a soil layer to enter a drainage system;
(10) a step of dynamic compaction, which is to adopt a rammer device to carry out dynamic compaction operation on a construction area;
(11) and detecting the bearing capacity, namely detecting the bearing capacity of the foundation and evaluating whether the engineering requirements are met.
2. A construction method for treating a soft soil foundation of a hydraulic reclamation project as recited in claim 1, wherein: the step (1) is also preceded by a step of preparation before construction, in which the cleaning of the construction site, the parking of construction equipment and the preparation of construction materials are carried out.
3. A construction method for treating a soft soil foundation of a hydraulic reclamation project as recited in claim 1, wherein: the distance between the vibration points determined in the step (1) is less than or equal to 2.0m, the light well points are arranged in a rectangular lattice mode, the transverse distance between every two adjacent light well points is 2.0m, and the longitudinal distance is 4.0 m.
4. A construction method for treating a soft soil foundation of a hydraulic reclamation project as recited in claim 1, wherein: in the step (3), the depth of the back shovel type land and water excavator inserted into the soil layer is more than or equal to 1.5m, and the vibration retention time of each vibration application point is 2 min.
5. A construction method for treating a soft soil foundation of a hydraulic reclamation project as recited in claim 1, wherein: the drainage system established in the step (5) comprises a drainage open channel and a drainage side channel which are communicated; the drainage open channels are arranged in the construction site and comprise a plurality of transverse open channels and longitudinal open channels, the drainage side channels are arranged on the outer side of the construction site, and the channel bottom elevation of each drainage open channel is excavated according to a certain slope ratio.
6. The construction method for treating the soft soil foundation of the hydraulic reclamation project as recited in claim 5, wherein the construction method comprises the following steps: the width of the open drainage channel is more than or equal to 4m, and the depth of the open drainage channel is 3-4 m.
7. A construction method for treating a soft soil foundation of a hydraulic reclamation project as recited in claim 1, wherein: and (4) the light well point in the step (6) comprises a well pipe inserted into the soil layer of the site, wherein a filter screen is arranged at the lower end of the well pipe, four layers of 100-mesh nylon nets are selected as the filter screen, and the filter screen is bound and fixed at the lower end of the well pipe.
8. A construction method for treating a soft soil foundation of a hydraulic reclamation project as recited in claim 1, wherein: in the step (8), the drainage side ditch is continuously excavated and deepened along with the earthwork construction, and the depth of the finally formed drainage side ditch is more than or equal to 4 m.
9. A construction method for treating a soft soil foundation of a hydraulic reclamation project as recited in claim 1, wherein: the distance between the tube wells in the step (9) is 18-22 m, and the depth of the tube wells is 18-22 m.
10. A construction method for treating a soft soil foundation of a hydraulic reclamation project as recited in claim 1, wherein: and (11) detecting the bearing capacity of the foundation by adopting a static sounding method.
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| CN112726556A (en) * | 2021-02-02 | 2021-04-30 | 东营市勘察测绘院 | Dredger fill foundation treatment construction method |
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