CN102926390A - Method of shallow reinforcement and surface reinforcement of loess slope - Google Patents
Method of shallow reinforcement and surface reinforcement of loess slope Download PDFInfo
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- CN102926390A CN102926390A CN2012104484137A CN201210448413A CN102926390A CN 102926390 A CN102926390 A CN 102926390A CN 2012104484137 A CN2012104484137 A CN 2012104484137A CN 201210448413 A CN201210448413 A CN 201210448413A CN 102926390 A CN102926390 A CN 102926390A
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Abstract
The invention provides a method of shallow reinforcement and surface reinforcement of a loess slope. The method of shallow reinforcement and surface reinforcement of the loess slope comprises steps as below: excavation of intercepting drains, molding of intercepting drains, hole-drilling, grouting and preparation of a consolidation layer, wherein the molding of the intercepting drains means that waterborne polyurethane resin is sprayed on the surfaces of the intercepting drains. The hole-drilling means that holes are drilled perpendicularly to a slope surface. The grouting means that after drilling, the holes are grouted. The preparation of the consolidation layer means that the waterborne polyurethane is sprayed on the slope face with shallow drilling grouting reinforcement and a consolidation layer is formed on the slope surface. Due to the fact that shallow reinforcement and surface reinforcement of silty loess, the stability of the slope is effectively enhanced, shear strength of soil body of the reinforcement layer is improved almost three times than the shear strength of raw soils, and the consolidation layer with good elasticity, strength, cold resistance and anti-leakage functions is formed on the slope surface. The problems of efflorescing off of the surface and slope erosion are solved.
Description
Technical field
The invention belongs to the upper soll layer field of reinforcement, be specially a kind of reinforcement means of loess slope.
Background technology
China is the country that loess distribution is the widest in the world, thickness is maximum, loess geomorphy mainly is distributed between 30 °～48 ° of north latitude westerly and on the bar shaped area in east, about 640,000 square kilometres of area, and wherein the provinces such as Shanxi, Shaanxi, Gansu are typical the distributional region of the Loess, distribution area is wide, and thickness is large.Not only the loess area is large in this area, and the surface water salt content is more, and vegetation is not abundant.
The vertical joints that loess has visual visible macropore and grows, when soil layer soaks or under the impact of Action of Gravity Field, loess formation itself has just lost fixed performance, usually causes strong depression and distortion.During the infrastructure constructions such as the public railway of Canal in Loess Area, irrigation and water conservancy, form a large amount of multilevel cutting side slopes, for improving the stability of side slope, ensure and usually adopt the measure of stone masonry traditional bank by the infrastructure safe operation.Particularly for the opaque loess slope, during domatic just formation, domatic overall structure is basicly stable, affected by Exposure to Sunlight, weathering, rainfall etc., weathering off will appear in a short time, the outstanding problems such as outstanding domatic unstability and whole destruction such as subside, take the measure of stone masonry traditional bank, not only long in time limit, cost is high, and the stone masonry bank protection is subject to the impact of inhomogeneous modification, low temperature freeze thawing, rainfall erosion, and ruptures, collapses.
The loess of the provinces such as northern China Shanxi, Shaanxi, Gansu is mainly opaque loess, soil desertification is serious, and the phenology condition is dry, and the four seasons temperature difference is large, the reinforcing difficulty of side slope is large, has the demand to more effective reinforcing side slope technique in highway construction, water conservancy construction field always.
Summary of the invention
For solving the existing outstanding problem of above-mentioned Canal in Loess Area side slope protection, the present invention proposes the fixed method in loess slope shallow layer reinforcement and top layer.
For achieving the above object, concrete technical scheme is:
The fixed method of a kind of loess slope shallow layer reinforcement and top layer comprises step:
1) excavation drain dyke: at side slope outer rim excavation catchwater.In the inboard excavation of platform transverse drain ditch, and/or at domatic excavation longitudinal drainage ditch;
2) drain dyke plastotype: at drain dyke surface spraying waterborne polyurethane resin, the catchwater and the gutter surface spraying waterborne polyurethane resin that namely excavate in step 1);
3) boring: perpendicular to domatic boring;
4) reinforce: after the boring, grouting and reinforcing in the hole, used reinforcing slurries are cement-bentonite grout, superfine cement slurries, a kind of in cement-water glass slurries, water glass-calcium chloride slurry, waterborne polyurethane resin slurries or the acrylamide slurries;
5) preparation bonding course: on shallow layer drilling grouting and reinforcing domatic, the spraying aqueous polyurethane is at the domatic bonding course that forms.
Wherein, the step that also comprises cleaning loess slope layer weathering unconsolidated formation before the described step 1).Adopt mode artificial and that machinery combines to clear up domatic top layer weathering unconsolidated formation, clear up for domatic then need not of the engineering of new formation.
Wherein, the drain dyke furrow width 30-100cm in the described step 1), ditch depth 20-50cm.
Wherein, described drain dyke comprises catchwater and gutter, catchwater furrow width 40-100cm wherein, ditch depth 20-50cm; Draining furrow width 30-80cm, ditch depth 20-40cm.
Wherein, described catchwater is positioned at domatic outward flange 1.5-3m scope; The gutter is the platform transverse drain ditch, and/or domatic longitudinal drainage ditch; The platform transverse drain ditch communicates with catchwater, and domatic longitudinal drainage ditch communicates with the platform transverse drain ditch is vertical.
Wherein, the degree of depth of infiltrating of spraying waterborne polyurethane resin is 3-7cm described step 2).Aqueous polyurethane is take water as decentralized medium, and concentration is in the 8-20%(volume ratio), in preparation and use procedure not with an organic solvent, have do not fire, the advantage such as nontoxic, free from environmental pollution, easy processing.Waterborne polyurethane resin domatic form have good elasticity, the bonding course of intensity, cold-resistant and antiseepage function, structure does not change when being low to moderate-20 ℃ at temperature.This loess slope reinforcement means is applicable to various Loess Surfaces, is particularly suited for the reinforcing of opaque Loess Surface, efficiently solves Loess Surface weathering, freeze thawing and rainfall erosion, the difficult problems such as domatic shallow-layer settlement by soaking slump.
Wherein, the distance of the in length and breadth spacing 0.8-1.5m that holes in the described step 3), aperture 3-10cm.
Wherein, the reinforcing slurries in the described step 4) are water glass-calcium chloride or waterborne polyurethane resin.Slurry injection technique is the engineering of practical a, applied range, it is with hydraulic pressure, air pressure or electrochemical method, the fixed slurries of Rock And Soil are injected in hole, crack or the boring of Rock And Soil, strengthen intensity, impermeability, the stability of Rock And Soil, thereby reach the purpose of the physico-mechanical properties that improves Rock And Soil.
Wherein, in the described step 5) spraying aqueous polyurethane infiltrate degree of depth 2-5cm, aqueous polyurethane concentration 5-15%.
Beneficial effect of the present invention is:
By fixed to this domatic enforcement opaque loess shallow layer reinforcement and top layer, effectively strengthened the above domatic stability of retaining face, the shear strength of the back-up coat soil body has improved nearly 3 times than the native shear strength of essence, form on domatic top layer have good elasticity, the bonding course of intensity, cold-resistant and antiseepage function, thoroughly solved top layer weathering off, slope erosion problem.
Description of drawings
Fig. 1 is domatic front schematic view.Fig. 2 is domatic cross sectional side view.
Among the figure, 1 is catchwater, and 2 is platform, and 3 is domatic, and 4 are boring, and 5 is domatic longitudinal drainage ditch, and 6 is the platform transverse drain ditch.
The specific embodiment
Following examples are used for explanation the present invention, but are not used for limiting the scope of the invention.
Among the embodiment, used aqueous polyurethane is available from Jiangsu ATK Environmental Engineering Design ﹠ Research Institute Co., Ltd..
Embodiment 1: Zhongweiof Ningxia, northwest China city open-air reservoir loess slope shallow layer reinforcement and top layer fixed
Ningxia autonomous region Zhongwei City open-air reservoir loess slope shallow-layer anti-seepage reinforcing, domatic high 4m, the slope is than 1:0.6, and domatic weathering off phenomenon is serious.Belong to the continental monsoon climate in north temperate zone, 8.4 ℃ of average temperatures of the whole year, the lowest temperature-20 ℃, 33 ℃ of the highest temperatures.For the edaphic condition of this opaque loess, the reinforcing step is as follows:
1, domatic cleaning.Adopt mode artificial and that machinery combines to clear up domatic top layer weathering unconsolidated formation.
2, excavation drain dyke.At side slope outer rim excavation catchwater, the catchwater section is nature arc gutter, and furrow width is 60cm, and ditch depth is 40cm.Domatic upper spacing 50m excavation longitudinal drainage ditch, longitudinal drainage ditch section is nature arc gutter, furrow width is 40cm, ditch depth 20cm.
3, drain dyke plastotype.At catchwater and the longitudinal drainage ditch surface spraying waterborne polyurethane resin of new excavation, concentration 10% is infiltrated degree of depth 4cm.Formation has the bonding course of good elasticity, intensity, cold-resistant and antiseepage function.
4, be the default position, hole of distance of 0.8m according to spacing in length and breadth on domatic, adopt hand-held core drill to get out boring perpendicular to domatic on predetermined position, hole, the aperture is 5cm, and drilling depth is 70cm.
5, after the boring, take two component slurry injection techniques (referring to standard JGJ211-2010), in the hole, inject the cement-sodium silicate slurry.
6, on shallow layer drilling grouting and reinforcing domatic, the spraying aqueous polyurethane, concentration 8% is infiltrated degree of depth 3cm.
By fixed to this domatic enforcement opaque loess shallow layer reinforcement and top layer, effectively strengthened the above domatic stability of retaining face, the shear strength of the back-up coat soil body has improved nearly 3 times than the native shear strength of essence, form on domatic top layer have good elasticity, the bonding course of intensity, cold-resistant and antiseepage function, thoroughly solved top layer weathering off, slope erosion problem.This bonding course was made 3 years, did not observe breakage.
Embodiment 2: City of Ningxia Highway Loess Slope shallow layer reinforcement and top layer are fixed
Three grades of side slopes of this domatic genus, domatic weathering off phenomenon is serious.For the edaphic condition of this opaque loess, reinforce step following (referring to Fig. 1 and Fig. 2):
1, domatic cleaning.Adopt mode artificial and that machinery combines to clear up domatic 3 top layer weathering unconsolidated formations.
2, excavation drain dyke.At side slope outward flange excavation catchwater 1, catchwater 1 section is nature arc gutter, and furrow width W2 is 60cm, and ditch depth is 40cm.In the inboard excavation of platform platform transverse drain ditch 6, the transverse drain ditch section is nature arc gutter, and furrow width is 50cm, ditch depth 30cm.Spacing 50m excavation longitudinal drainage ditch 5 on domatic, longitudinal drainage ditch 5 sections are nature arc gutter, furrow width W1 is 40cm, ditch depth 20cm.Longitudinal drainage ditch 5 communicates with platform transverse drain ditch 6.
3, drain dyke plastotype.At catchwater 1 and the gutter surface spraying waterborne polyurethane resin of new excavation, concentration 10% is infiltrated degree of depth 4cm.Formation has the bonding course of good elasticity, intensity, cold-resistant and antiseepage function.
4, be the default position, hole of distance of 0.8m according to space D in length and breadth on domatic, adopt hand-held core drill to hole 4 perpendicular to domatic getting out on predetermined position, hole, the aperture is 5cm, and drilling depth L is 70cm.
5, after the boring, take two component slurry injection techniques, in the hole, inject the cement-sodium silicate slurry.
6, on shallow layer drilling grouting and reinforcing domatic, the spraying aqueous polyurethane, concentration 8% is infiltrated degree of depth 3cm.
By fixed to this domatic enforcement opaque loess shallow layer reinforcement and top layer, effectively strengthened domatic stability, form on domatic top layer have good elasticity, the bonding course of intensity, cold-resistant and antiseepage function, thoroughly solved top layer weathering off, slope erosion problem.
Embodiment 3: Gansu Province's highway opaque loess slope is reinforced
11.5 ℃ of this ground average temperatures of the whole year, year lowest temperature-20 ℃.
This is domatic to be the secondary road side slope, 7580 square metres of domatic areas, and the high 8m in one-level slope, the high 6.5m in secondary slope, sloping than 1:0.75, the wide 2.5m of platform.
The slope reinforcement step comprises:
1, adopts mode artificial and that machinery combines to clear up domatic top layer weathering unconsolidated formation, keep slope leveling.
2, excavation drain dyke.At side slope outward flange excavation catchwater, the catchwater section is nature arc gutter, furrow width 80cm, ditch depth 45cm.In the inboard excavation of platform transverse drain ditch, discharge section is nature arc gutter, and furrow width is 50cm, ditch depth 30cm; Every 50m excavation longitudinal drainage ditch domatic, longitudinal drainage ditch section is nature arc gutter, furrow width 40cm, ditch depth 20cm, the longitudinal drainage ditch communicates with the platform transverse drain ditch.
3, drain dyke plastotype.At the novel aqueous polyurethane resin of drain dyke surface spraying of new excavation, concentration is 15%, infiltrates degree of depth 3cm.
4, on domatic according to the default position, hole of distance of spacing 1m in length and breadth, adopt hand-held core drill on predetermined position, hole perpendicular to domatic boring, aperture 8cm, degree of depth 100cm.
5, after the boring, take two component slurry injection techniques, injected water glass in the hole-calcium chloride slurry.
6, on shallow layer drilling grouting and reinforcing domatic, spray novel aqueous polyurethane, concentration is 12%, infiltrates degree of depth 5cm.
By implementing opaque loess slope shallow layer reinforcement, Effective Raise domatic resistance to overturning, anti-shearing and the tensile strength of back-up coat has improved nearly 2.5 and 3.4 times than the anti-shearing and tensile strength of essence soil respectively, efficiently solves the outstanding problems such as opaque Loess Surface weathering off, precipitation erosion, domatic slippage.Compare with traditional stone masonry safeguard procedures, avoided the exploitation of stone environmental disruption, reduce the building stones long-distance transportation and manually build every square meter saving cost nearly 20% by laying bricks or stones.After stabilization works is finished 3 years, do not observe breakage.
Claims (10)
1. fixed method of loess slope shallow layer reinforcement and top layer comprises step:
1) excavation drain dyke: at side slope outward flange excavation catchwater; In the inboard excavation of platform transverse drain ditch, and/or at domatic excavation longitudinal drainage ditch;
2) drain dyke plastotype: at drain dyke surface spraying waterborne polyurethane resin;
3) boring: perpendicular to domatic boring;
4) reinforce: after the boring, grouting and reinforcing in the hole, used reinforcing slurries are cement-bentonite grout, superfine cement slurries, a kind of in cement-water glass slurries, water glass-calcium chloride slurry, waterborne polyurethane resin slurries or the acrylamide slurries;
5) preparation bonding course: on shallow layer drilling grouting and reinforcing domatic, the spraying aqueous polyurethane is at the domatic bonding course that forms.
2. the method for claim 1 is characterized in that, also comprises the step of cleaning loess slope layer weathering unconsolidated formation before the described step 1).
3. the method for claim 1 is characterized in that, the furrow width 30-100cm in the catchwater in the described step 1) and gutter, and ditch depth 20-50cm, furrow width and the ditch depth in catchwater and gutter are identical or different.
4. method as claimed in claim 3 is characterized in that, described catchwater furrow width 40-100cm, ditch depth 20-50cm; Draining furrow width 30-80cm, ditch depth 20-40cm.
5. such as the arbitrary described method of claim 1-4, it is characterized in that described catchwater is positioned at domatic outward flange 1.5-3m scope; The gutter is the platform transverse drain ditch, and/or domatic longitudinal drainage ditch; The platform transverse drain ditch communicates with catchwater, and domatic longitudinal drainage ditch communicates with the platform transverse drain ditch is vertical.
6. the method for claim 1 is characterized in that, described step 2) in the spraying waterborne polyurethane resin the degree of depth of infiltrating be 3-7cm.
7. the method for claim 1 is characterized in that, described step 2) in the spraying aqueous polyurethane volumetric concentration be 8-20%.
8. the method for claim 1 is characterized in that, the distance of the in length and breadth spacing 0.8-1.5m that holes in the described step 3).
9. the method for claim 1 is characterized in that, the reinforcing slurries in the described step 4) are water glass-calcium chloride or waterborne polyurethane resin.
10. the method for claim 1 is characterized in that, the degree of depth of infiltrating of spraying aqueous polyurethane is 2-5cm in the described step 5), and aqueous polyurethane concentration is 5-15%.
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Cited By (9)
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| CN103821153A (en) * | 2014-01-10 | 2014-05-28 | 东南大学 | Arsenic sandstone slope treating method |
| CN104452781A (en) * | 2014-10-21 | 2015-03-25 | 深圳市东华园林绿化有限公司 | High and steep rock slope ecological restoration structure and method |
| CN105275002A (en) * | 2015-11-17 | 2016-01-27 | 中国铁道科学研究院铁道建筑研究所 | Slope protection structure |
| CN108104096A (en) * | 2018-01-09 | 2018-06-01 | 中国电建集团华东勘测设计研究院有限公司 | It is a kind of to prevent the construction method on the runoff plots side ridge of runoff lateral leakage and runoff plots Bian Geng |
| CN109296216A (en) * | 2018-11-09 | 2019-02-01 | 西北大学 | A kind of in-situ remediation method of Analysis of Loess Cave Dwellings |
| CN110326496A (en) * | 2019-08-16 | 2019-10-15 | 福建省岚禹建设工程有限公司 | A kind of Topographic factor comprehensive processing method |
| CN113186951A (en) * | 2021-04-28 | 2021-07-30 | 西藏农牧学院 | Ecological reinforcing method for loose coarse-grained mixed soil slope |
| CN113373951A (en) * | 2021-05-20 | 2021-09-10 | 杭州交投建设工程有限公司 | Silt slope stability control method for slope stabilization by using chemical improvement reagent |
| CN113622995A (en) * | 2021-08-23 | 2021-11-09 | 西安理工大学 | Expansion-preventing method for expansive loess plateau through expansive loess tunnel |
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| CN110326496A (en) * | 2019-08-16 | 2019-10-15 | 福建省岚禹建设工程有限公司 | A kind of Topographic factor comprehensive processing method |
| CN113186951A (en) * | 2021-04-28 | 2021-07-30 | 西藏农牧学院 | Ecological reinforcing method for loose coarse-grained mixed soil slope |
| CN113186951B (en) * | 2021-04-28 | 2022-10-14 | 西藏农牧学院 | Ecological reinforcing method for loose coarse-grained mixed soil slope |
| CN113373951A (en) * | 2021-05-20 | 2021-09-10 | 杭州交投建设工程有限公司 | Silt slope stability control method for slope stabilization by using chemical improvement reagent |
| CN113622995A (en) * | 2021-08-23 | 2021-11-09 | 西安理工大学 | Expansion-preventing method for expansive loess plateau through expansive loess tunnel |
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Effective date of registration: 20180410 Address after: No. 58-9, embroidery Creek Road, Wuxi City, Jiangsu, Jiangsu Patentee after: Jiangsu lvzhiyuan Ecological Construction Co. Ltd. Address before: 100190 C, century trade building, No. 66, Zhongguancun East Road, Beijing, Haidian District, 2004 Patentee before: Beijing Beilinlvyuan Ecology Technology Research Institute Co., Ltd. |
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Address after: 214125 West 12 floor, K-Park business center, 50 embroidery Road, Binhu District, Wuxi, Jiangsu, China, 1 Patentee after: Jiangsu lvzhiyuan Ecological Construction Co. Ltd. Address before: 214125 No. 58-9 embroidery Road, Binhu District, Wuxi, Jiangsu Patentee before: Jiangsu lvzhiyuan Ecological Construction Co. Ltd. |