CN111733763A - Landscape river landslide treatment method - Google Patents
Landscape river landslide treatment method Download PDFInfo
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- CN111733763A CN111733763A CN202010426524.2A CN202010426524A CN111733763A CN 111733763 A CN111733763 A CN 111733763A CN 202010426524 A CN202010426524 A CN 202010426524A CN 111733763 A CN111733763 A CN 111733763A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
- E02B3/04—Structures or apparatus for, or methods of, protecting banks, coasts, or harbours
- E02B3/12—Revetment of banks, dams, watercourses, or the like, e.g. the sea-floor
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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
- E02D3/005—Soil-conditioning by mixing with fibrous materials, filaments, open mesh or the like
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/46—Concrete or concrete-like piles cast in position ; Apparatus for making same making in situ by forcing bonding agents into gravel fillings or the soil
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Civil Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Soil Sciences (AREA)
- Agronomy & Crop Science (AREA)
- Ocean & Marine Engineering (AREA)
- Mechanical Engineering (AREA)
- Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)
Abstract
The invention relates to a landslide treatment method of a landscape river, adopting layered soil-piling and layered rolling for miscellaneous filling soil filled in a soil slope, wherein the thickness of the soil-piling at one time is not more than 0.5m, laying geogrids in layers, the filling rate is not more than 1.0 m/week along the height direction, and one layer is laid on each geogrid every 2m along the height direction; and (3) for the soft soil foundation under the soil slope, adopting cement mixing piles to carry out reinforcement treatment, and checking the stability of the slip arcs of all the sections. When the soil slope cannot reach self-stable balance in a natural state, the soil slope is kept stable under the condition of normal use.
Description
Technical Field
The invention relates to the technical field of slope or slope stabilization, in particular to a landslide treatment method for a landscape river channel.
Background
Currently, the green corridor mainly refers to a vegetation zone which is structurally different from surrounding vegetation and connects a plurality of vegetation patches which are isolated from each other. The green galleries are used for connecting the habitat islands together, so that the influence of landscape fragmentation on biodiversity can be reduced or even eliminated.
The green corridor has multiple functions, and the most important is the ecological protection function of the green corridor, namely (1) the ecological process of the nature is maintained, and the green corridor has the functions of flood control, soil fixation, water source cleaning, air purification and the like; (2) protecting the internal habitat from external interference and becoming a habitat for biological protection; (3) according to the collective population theory and the island geographic theory, the green road can reduce the fragmentation degree of the landscape; (4) the dispersed fragmented animal habitats are connected to provide a channel for the movement of animals, so that the animals can freely diffuse and migrate, the species gene communication is increased, the population isolation is prevented, the minimum population number is maintained, and the biodiversity is protected; (5) animals are adapted to global climate changes by migrating between different habitats.
In the prior art, in order to establish an ecological corridor on a river landslide in a certain area, a plurality of artificial soil slopes with different heights and slopes need to be piled in the area, and the piling material is miscellaneous filling soil. However, the artificial soil slope cannot achieve self-stable balance in a natural state, and a certain treatment is required to keep the soil slope stable under the condition of normal use.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a landslide treatment method for a landscape river, which has the function of keeping the soil slope stable under the condition of normal use.
The above object of the present invention is achieved by the following technical solutions:
a method for treating landslide of a landscape river, the method comprising: adopting layered soil filling and layered rolling for the miscellaneous filling soil filled in the soil slope, wherein the thickness of the soil filling at one time is not more than 0.5m, laying geogrids in layers, the filling rate is not more than 1.0 m/week along the height direction, and one layer of geogrid is laid every 2m along the height direction; and (3) for the soft soil foundation under the soil slope, adopting cement mixing piles to carry out reinforcement treatment, and checking the stability of the slip arcs of all the sections.
Further, the geogrid design parameters include: (1) adopting a bidirectional geogrid; (2) the tensile strength of the geogrid is not lower than 50 kN/m; (3) the miscellaneous fill layer must be leveled and spread the geogrid after can't have sharp edges and corners; (4) adopting a horizontal laying direction, wherein the geogrid is smoothly straightened along the height direction of 2 m/layer and is tightly attached to the bottom layer without distortion, wrinkles and overlapping; (5) in order to ensure the integrity of the geosynthetic material, the width of the geotechnical lap joint is 0.3m, and the lap joint is bound by an iron wire; (6) when two layers of geogrids are laid on the upper layer and the lower layer, the staggered width of the upper layer and the lower layer is not less than 0.5 m; (7) the geogrid should be prevented from being exposed to the sun or exposed for a long time as much as possible in the storage and construction laying engineering so as to avoid performance degradation; (8) mechanical equipment is strictly prohibited from rolling directly on the geogrid.
Further, the cement mixing pile design parameters include: (1) temporarily setting the pile top elevation of the cement mixing pile to be +2.0 m; (2) the pile diameter of the cement mixing pile is 0.6 m; (3) the cement is 42.5 ordinary Portland cement, and the doping amount is 15% by mass; (4) the water-cement ratio is 0.45-0.55; (5) calcium lignosulphonate accounting for 0.2 percent of the weight of the cement and gypsum powder accounting for 2 percent of the weight of the cement are mixed; (6) adopting a bidirectional cement mixing pile process, and carrying out secondary mixing and primary spraying; the sinking speed of the drill rod is 0.5-0.6 m/min, and the lifting speed is 0.7-0.8 m/min; (7) the rotating speed of the inner drill rod is not lower than 50 revolutions per minute, and the rotating speed of the outer drill rod is not lower than 70 revolutions per minute; (8) the guniting pressure is 0.3-0.4 MPa when sinking; (9) the unconfined compressive strength of the pile body is not lower than 0.8MPa after 28 days; (10) during construction, the pile position deviation is not more than 5cm, and the verticality deviation is not more than 1%; (11) if the pile machine cannot penetrate through the existing miscellaneous fill layer, construction needs to be carried out after excavation; (12) coring all the pile sections of the cement mixing piles to be detected, wherein the detection number is 0.5-1% of the total pile number; if the construction quality is doubtful, the detection quantity can be increased properly; (13) and (4) testing the pile before formal construction so as to check the process feasibility and the matching of construction parameters.
Further, the soil piling construction parameters comprise: (1) before construction, a special soil piling construction scheme is compiled by related construction units, and construction can be carried out after the verification is passed; (2) after the cement mixing pile meets the 28-day maintenance period and is detected to be qualified, soil piling operation can be carried out; (3) layering and stacking soil, layering and rolling, wherein the thickness of the soil stacking at one time is not more than 0.5m, and layering and paving geogrids; (4) stacking to a design elevation according to design requirements without exceeding the stack; (5) the filling speed is not more than 1.0 m/week along the height direction; (6) the slope of the soil slope required by the design is required to be met, and a man-made steep slope cannot be manufactured; (7) during soil piling, information construction is carried out, and soil slope stability monitoring is carried out; (8) the periphery close to the municipal road cannot be used as a temporary transfer site for miscellaneous filling of a field area, so that adverse effects on the peripheral road and municipal pipelines are avoided; (9) construction machinery such as excavators should keep sufficient safe distance from the edge of the hillside, prevent the unstability of hillside and mechanical side tumbling.
Further, the method further comprises displacement detection: observing for 2-3 times before filling the soil slope, wherein the observation result is used as an initial value of each observation period; observing the soil slope once every day from the beginning of filling to the end of filling; when the monitoring warning value is reached, increasing the observation times; observation may be made every two days or more after half a month of completion of the pack.
Further, the method also comprises the following steps of monitoring the construction of the soil slope: (1) the first observation result is an initial value observed in each period, and has more accurate and reliable observation precision than the observation result in each period, and measures for properly increasing the number of measured returns are preferably adopted; (2) the stability detection is carried out on the used reference points or working base points at regular intervals, and after the point positions are stable, the detection period can be properly prolonged; when the deformation result is suspected, checking at any time; (3) before observation, all instruments and equipment must be checked according to relevant regulations and recorded; (4) fixing the observers by using the same instrument and equipment and adopting the same observation route and observation method; (5) operate as much as possible under substantially the same environment and conditions; (6) in rainy days, the monitoring density is increased; (7) and (4) entrusting a qualified professional monitoring unit to compile a monitoring scheme and implement monitoring.
Further, the method also comprises monitoring an alarm value, wherein (1) the displacement deformation rate of the deep soil is more than 5mm/d for 3 consecutive days; (2) the horizontal displacement rate of the slope toe is more than 5 mm/d; (3) the ground settlement rate of the center point of the soil slope is more than 10 mm/d; (4) the settlement rate of the road surface is more than 2 mm/d; when one of the four conditions is observed, the filling is stopped immediately.
In summary, the invention includes at least one of the following beneficial technical effects:
for the miscellaneous fill filled in the soil slope, adopting a bidirectional geogrid to horizontally lay in multiple layers; for a soft soil foundation under a soil slope, adopting cement mixing piles to carry out reinforcement treatment, and checking the stability of the sliding arc of each section; when the soil slope cannot reach self-stable balance in a natural state, the soil slope is kept stable under the condition of normal use.
Detailed Description
The present invention is described in further detail below with reference to the accompanying drawings.
The invention provides a landscape river landslide treatment method, when an earth slope cannot achieve self-stable balance in a natural state, in order to keep the earth slope stable under the condition of normal use, the following measures are taken:
firstly, aiming at the miscellaneous filling soil filled in the soil slope, laying a plurality of layers of bidirectional geogrids horizontally, and laying one layer of geogrids every 2m along the height direction;
secondly, for soft soil foundation under the soil slope, adopting cement mixing piles to carry out reinforcement treatment, and checking the stability of sliding arcs of all the sections.
Design parameters of cement mixing pile and geogrid
(1) Design parameters of cement mixing pile
1. Temporarily setting the pile top elevation of the cement mixing pile to be +2.0m (yellow sea elevation);
2. the pile diameter of the cement mixing pile is 0.6 m;
3. the cement is 42.5 ordinary portland cement, and the mixing amount is 15% (mass ratio);
4. the water-cement ratio is 0.45-0.55;
5. if the early strength of the pile body is improved, calcium lignosulphonate accounting for 0.2 percent of the weight of the cement and gypsum powder accounting for 2 percent of the weight of the cement can be doped;
6. adopting a bidirectional cement mixing pile process, and carrying out secondary mixing and primary spraying; the sinking speed of the drill rod is 0.5-0.6 m/min, and the lifting speed is 0.7-0.8 m/min;
7. the rotating speed of the inner drill rod is not lower than 50 revolutions per minute, and the rotating speed of the outer drill rod is not lower than 70 revolutions per minute;
8. the guniting pressure is 0.3-0.4 MPa when sinking;
9. the unconfined compressive strength of the pile body is not lower than 0.8MPa after 28 days;
10. during construction, the pile position deviation is not more than 5cm, and the verticality deviation is not more than 1%;
11. if the pile machine cannot penetrate through the existing miscellaneous fill layer, construction needs to be carried out after excavation;
12. coring all the pile sections of the cement mixing piles to be detected, wherein the detection number is 0.5-1% of the total pile number; if the construction quality is doubtful, the detection quantity can be increased properly;
13. and (4) testing the pile before formal construction so as to check the process feasibility and the matching of construction parameters.
(1) Geogrid design parameters
1. Adopting a bidirectional geogrid;
2. the tensile strength of the geogrid is not lower than 50 kN/m;
3. the miscellaneous fill layer must be leveled and spread the geogrid after can't have sharp edges and corners;
4. adopting a horizontal laying direction, wherein the geogrid is smoothly straightened along the height direction of 2 m/layer and is tightly attached to the bottom layer without distortion, wrinkles and overlapping;
5. in order to ensure the integrity of the geosynthetic material, the width of the geotechnical lap joint is 0.3m, and the lap joint is bound by an iron wire;
6. when two layers of geogrids are laid on the upper layer and the lower layer, the staggered width of the upper layer and the lower layer is not less than 0.5 m;
7. the geogrid should be prevented from being exposed to the sun or exposed for a long time as much as possible in the storage and construction laying engineering so as to avoid performance degradation;
8. mechanical equipment is strictly prohibited from rolling directly on the geogrid.
Second, the construction parameters of soil piling
(1) Before construction, a special soil piling construction scheme is compiled by related construction units, and construction can be carried out after the verification is passed;
(2) after the cement mixing pile meets the 28-day maintenance period and is detected to be qualified, soil piling operation can be carried out;
(3) layering and stacking soil, layering and rolling, wherein the thickness of the soil stacking at one time is not more than 0.5m, and layering and paving geogrids;
(4) stacking to a design elevation according to design requirements without exceeding the stack;
(5) the filling speed is not more than 1.0 m/week along the height direction;
(6) the slope of the soil slope required by the design is required to be met, and a man-made steep slope cannot be manufactured;
(7) during soil piling, information construction is carried out, and soil slope stability monitoring is carried out;
(8) the periphery close to the municipal road cannot be used as a temporary transfer site for miscellaneous filling of a field area, so that adverse effects on the peripheral road and municipal pipelines are avoided;
(9) construction machinery such as excavators should keep sufficient safe distance from the edge of the hillside, prevent the unstability of hillside and mechanical side tumbling.
Thirdly, monitoring the construction of the soil slope:
in order to ensure the whole construction safety of the soil slope, settlement and stable monitoring are carried out. The fill rate should be tightly controlled to avoid foundation damage due to too fast loading.
1. Monitoring content
(1) Soil slope deep soil displacement monitoring
The observation of the lateral deformation of the soil slope is a more intuitive and effective method in the monitoring of the construction process, and the measurement is carried out by a common inclinometer, which is an engineering measuring instrument capable of accurately measuring the horizontal displacement of the soil layer along the vertical direction. The deep soil displacement observation can be carried out by adopting a CX-03D type inclinometer (the probe sensitivity is 0.02mm/500mm, and the reading precision of a data inclinometer is 0.01 mm) in the engineering. And measuring in two directions by taking each 0.5m of the inclination measuring hole as a measuring point.
(2) Observing the horizontal slope toe and the vertical displacement of the center point of the soil slope;
(3) and (5) observing the vertical displacement of the road.
2. Monitoring requirements
(1) The first observation result is an initial value observed in each period, and has more accurate and reliable observation precision than the observation result in each period, and measures for properly increasing the number of measured returns are preferably adopted;
(2) the stability detection is carried out on the used reference points or working base points at regular intervals, and after the point positions are stable, the detection period can be properly prolonged; when the deformation result is suspected, checking at any time;
(3) before observation, all instruments and equipment must be checked according to relevant regulations and recorded;
(4) fixing the observers by using the same instrument and equipment and adopting the same observation route and observation method;
(5) operate as much as possible under substantially the same environment and conditions;
(6) in rainy days, the monitoring density is increased;
(7) and (4) entrusting a qualified professional monitoring unit to compile a monitoring scheme and implement monitoring.
3. Monitoring arrangement
And (3) displacement detection: before the soil slope is filled, observation is carried out for 2-3 times, and the observation result is used as the initial value of each observation period.
Observing the soil slope once every day from the beginning of filling to the end of filling; and when the monitoring warning value is reached, increasing the observation times. Observation may be made every two days or more after half a month of completion of the pack.
4. Monitoring alarm values
(1) The displacement deformation rate of the deep soil body is more than 5mm/d for 3 consecutive days;
(2) the horizontal displacement rate of the slope toe is not more than 5 mm/d;
(3) the ground settlement rate of the center point of the soil slope is not more than 10 mm/d;
(4) the settlement rate of the road pavement is not more than 2 mm/d.
The observation results should be comprehensively analyzed in combination with the development trends of sedimentation and displacement. The filling rate should be controlled mainly by the horizontal displacement, and if the limit is exceeded, the filling should be stopped immediately.
Four, test pile
The cement mixing pile is tested before construction, and the feasibility of the process and the matching of various construction parameters are checked.
Fifthly, others
1. The scheme only considers the stability problem of the soil slope, and the problems of settlement of the soil slope, foundation reinforcement of structures in landscape engineering and the like are not considered;
2. because the silt soft soil layer is large in thickness and poor in property, under the action of the dead load of the backfill soil of the upper soil slope, the settlement after construction is large, and the settlement amount can bring adverse effects to the landscape effect of the soil slope;
3. peripheral roads and pipelines can generate certain additional settlement and horizontal displacement and have certain influence on the use function of the pipelines;
4. mucky soil cannot be directly piled up; if mucky soil is required to be used as a backfill material, the mucky soil is required to be dried in the sun and can be used; the existing large-volume mucky soil in the site backfill soil is removed;
5. filling cohesive soil into the existing mud pit area for layering compaction, wherein the compaction degree is not lower than 0.9;
6. during the construction of the cement mixing pile, attention should be paid to avoiding the bridge foundation, and the concrete site construction is determined;
7. the construction of the bidirectional cement mixing pile requires the consent of the original patent unit;
8. in the construction process, if an abnormal condition occurs, the design unit is required to be contacted in time;
9. and (5) executing according to relevant specifications and regulations when the matters are not in the best. .
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (7)
1. A landslide treatment method for a landscape river, the method comprising:
adopting layered soil filling and layered rolling for the miscellaneous filling soil filled in the soil slope, wherein the thickness of the soil filling at one time is not more than 0.5m, laying geogrids in layers, the filling rate is not more than 1.0 m/week along the height direction, and one layer of geogrid is laid every 2m along the height direction;
and (3) for the soft soil foundation under the soil slope, adopting cement mixing piles to carry out reinforcement treatment, and checking the stability of the slip arcs of all the sections.
2. The method of claim 1, wherein the geogrid design parameters include:
(1) adopting a bidirectional geogrid;
(2) the tensile strength of the geogrid is not lower than 50 kN/m;
(3) the miscellaneous fill layer must be leveled and spread the geogrid after can't have sharp edges and corners;
(4) adopting a horizontal laying direction, wherein the geogrid is smoothly straightened along the height direction of 2 m/layer and is tightly attached to the bottom layer without distortion, wrinkles and overlapping;
(5) in order to ensure the integrity of the geosynthetic material, the width of the geotechnical lap joint is 0.3m, and the lap joint is bound by an iron wire;
(6) when two layers of geogrids are laid on the upper layer and the lower layer, the staggered width of the upper layer and the lower layer is not less than 0.5 m;
(7) the geogrid should be prevented from being exposed to the sun or exposed for a long time as much as possible in the storage and construction laying engineering so as to avoid performance degradation;
(8) mechanical equipment is strictly prohibited from rolling directly on the geogrid.
3. The method for treating landslide of claim 1, wherein the cement mixing pile design parameters comprise:
(1) temporarily setting the pile top elevation of the cement mixing pile to be +2.0 m;
(2) the pile diameter of the cement mixing pile is 0.6 m;
(3) the cement is 42.5 ordinary Portland cement, and the doping amount is 15% by mass;
(4) the water-cement ratio is 0.45-0.55;
(5) calcium lignosulphonate accounting for 0.2 percent of the weight of the cement and gypsum powder accounting for 2 percent of the weight of the cement are mixed;
(6) adopting a bidirectional cement mixing pile process, and carrying out secondary mixing and primary spraying; the sinking speed of the drill rod is 0.5-0.6 m/min, and the lifting speed is 0.7-0.8 m/min;
(7) the rotating speed of the inner drill rod is not lower than 50 revolutions per minute, and the rotating speed of the outer drill rod is not lower than 70 revolutions per minute;
(8) the guniting pressure is 0.3-0.4 MPa when sinking;
(9) the unconfined compressive strength of the pile body is not lower than 0.8MPa after 28 days;
(10) during construction, the pile position deviation is not more than 5cm, and the verticality deviation is not more than 1%;
(11) if the pile machine cannot penetrate through the existing miscellaneous fill layer, construction needs to be carried out after excavation;
(12) coring all the pile sections of the cement mixing piles to be detected, wherein the detection number is 0.5-1% of the total pile number; if the construction quality is doubtful, the detection quantity can be increased properly;
(13) and (4) testing the pile before formal construction so as to check the process feasibility and the matching of construction parameters.
4. The method of claim 1, wherein the mound construction parameters comprise:
(1) before construction, a special soil piling construction scheme is compiled by related construction units, and construction can be carried out after the verification is passed;
(2) after the cement mixing pile meets the 28-day maintenance period and is detected to be qualified, soil piling operation can be carried out;
(3) layering and stacking soil, layering and rolling, wherein the thickness of the soil stacking at one time is not more than 0.5m, and layering and paving geogrids;
(4) stacking to a design elevation according to design requirements without exceeding the stack;
(5) the filling speed is not more than 1.0 m/week along the height direction;
(6) the slope of the soil slope required by the design is required to be met, and a man-made steep slope cannot be manufactured;
(7) during soil piling, information construction is carried out, and soil slope stability monitoring is carried out;
(8) the periphery close to the municipal road cannot be used as a temporary transfer site for miscellaneous filling of a field area, so that adverse effects on the peripheral road and municipal pipelines are avoided;
(9) construction machinery such as excavators should keep sufficient safe distance from the edge of the hillside, prevent the unstability of hillside and mechanical side tumbling.
5. The method of claim 1, further comprising displacement detection: observing for 2-3 times before filling the soil slope, wherein the observation result is used as an initial value of each observation period; observing the soil slope once every day from the beginning of filling to the end of filling; when the monitoring warning value is reached, increasing the observation times; observation may be made every two days or more after half a month of completion of the pack.
6. The method for treating landslide of claim 1, further comprising monitoring of landslide construction:
(1) the first observation result is an initial value observed in each period, and has more accurate and reliable observation precision than the observation result in each period, and measures for properly increasing the number of measured returns are preferably adopted;
(2) the stability detection is carried out on the used reference points or working base points at regular intervals, and after the point positions are stable, the detection period can be properly prolonged; when the deformation result is suspected, checking at any time;
(3) before observation, all instruments and equipment must be checked according to relevant regulations and recorded;
(4) fixing the observers by using the same instrument and equipment and adopting the same observation route and observation method;
(5) operate as much as possible under substantially the same environment and conditions;
(6) in rainy days, the monitoring density is increased;
(7) and (4) entrusting a qualified professional monitoring unit to compile a monitoring scheme and implement monitoring.
7. The method of claim 6, further comprising monitoring an alarm value:
(1) the displacement deformation rate of the deep soil body is more than 5mm/d for 3 consecutive days;
(2) the horizontal displacement rate of the slope toe is more than 5 mm/d;
(3) the ground settlement rate of the center point of the soil slope is more than 10 mm/d;
(4) the settlement rate of the road surface is more than 2 mm/d;
when one of the four conditions is observed, the filling is stopped immediately.
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