CN113863335A - Methods to control the slope collapse of drainage channel in quicksand formation and purify and reuse channel water - Google Patents
Methods to control the slope collapse of drainage channel in quicksand formation and purify and reuse channel water Download PDFInfo
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/20—Securing of slopes or inclines
- E02D17/207—Securing of slopes or inclines with means incorporating sheet piles or piles
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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
- E02D5/74—Means for anchoring structural elements or bulkheads
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Abstract
本发明属于排水沟道边坡治理技术领域，公开了治理流砂地层排水沟道边坡坍塌与沟水净化回用的方法，利用土工织物缝制土工袋，在袋内填充相应的填充物形成土工充填袋，在排水沟道边坡进行砌护，具体包括以下步骤：土工充填袋填充准备：选取白色人革基布作为土工织物缝制土工袋，袋内填充相应的填充物形成土工充填袋，用于在排水沟道边坡进行砌护；基础铺砌。本发明成功的将土工合成新材料、塑钢组合板桩新材料、微型混凝土桩、木桩与农田排水沟道边坡的治理相结合，有效的治理了灌区内沟道坍塌滑移等问题，并能够对排入沟道的田间入渗水进行滤水净化，实现沟水回用。
The invention belongs to the technical field of drainage channel slope treatment, and discloses a method for treating the collapse of drainage channel slope in quicksand strata and for purifying and reusing ditch water. The filling bag is used for laying protection on the slope of the drainage channel, which includes the following steps: Preparation for filling the geotechnical filling bag: Select the white artificial leather base cloth as the geotextile to sew the geotechnical bag, and fill the bag with the corresponding filler to form the geotechnical filling bag. It is used for masonry protection on the slope of the drainage channel; foundation laying. The invention successfully combines new geosynthetic materials, new plastic-steel composite sheet pile materials, micro-concrete piles, and wood piles with the treatment of farmland drainage channel slopes, and effectively solves the problems of channel collapse and slippage in the irrigation area, and reduces the risk of failure. It can filter and purify the field infiltration water discharged into the ditch, and realize the reuse of ditch water.
Description
Technical Field
The invention belongs to the technical field of drainage channel slope treatment, and particularly relates to a method for treating quicksand stratum drainage channel slope collapse and purifying and recycling channel water.
Background
The geotextile bag is a geotextile bag packaging technology and a derivative technology for paving the geotextile bag according to a certain arrangement mode and used for reinforcing the foundation, wherein materials such as soil, stone and the like are filled into a geosynthetic material to form a bag object meeting the engineering filling requirement, the geotextile woven bag formed by sewing is filled with soil, sand, broken stone, building waste or other materials to form a bag body.
Land salinization is a serious problem faced by the development of agriculture in the world and is also one of important reasons for land degradation and soil desertification. In arid and semiarid regions, a dynamic salinity balance must be maintained in the root zone of the crop in order to ensure the development of irrigation agriculture. The agricultural drainage system discharges excessive water in soil according to the principles of soil physics and hydraulics to remove salt in a soil profile and maintain the air permeability of the soil, thereby achieving the purpose of improving water and soil conditions to improve the production efficiency of cultivated land. Therefore, agricultural drainage is a prerequisite for controlling soil salinity and ensuring sustainable development of irrigation agriculture, and well-drained soil is beneficial to improving farmland cultivation efficiency in the whole season, but various salts, chemical fertilizers, pesticides and the like eluted from the soil in the drainage process can become pollution sources of surface water bodies such as surrounding rivers or lakes. In the field hydraulic engineering, the drainage channels at all levels play an important role in flood control, drainage and groundwater level reduction and guarantee of the normal growth of crops. However, the problem of local slippage and collapse of the side slope of the drainage channel; and the natural filtering and purifying effect of the irrigation water by the irrigation and drainage recycling middle drainage ditch implemented for solving the problem of water resource shortage, and the like, become outstanding problems to be solved urgently in the matched reconstruction engineering of farmland water conservancy in arid and semiarid regions in northwest China.
Taking the yellow irrigation district in northern Ningxia as an example, on one hand, due to special geographical environment and geological conditions, the drainage channel is influenced by flowing sand layers and alternate circulation of dry, wet and freeze thawing, and has to be renovated once in two years on average, and some places or even years need to be repaired. At present, some treatment measures are also taken, for example, a commonly used grass soil and timber pile slope protection technology is adopted, but after the operation is carried out for 2-3 years, damages such as local slippage, slope collapse and the like can occur; the dry stone slope protection technology is adopted, and the defects of high construction cost and deficient stone are also existed. Research finds that channel management is a bottleneck for restricting the construction of farmland water conservancy supporting facilities and agricultural sustainable development in Ningxia yellow river irrigation areas for many years. On the other hand, the control of drainage and the implementation of ditch water recycling also have important research and application values for irrigation agriculture in northwest arid and semi-arid regions. At the middle and upper reaches of the yellow river in Ningxia, three quarters of the territorial area of China belongs to a drought zone, and the area has small quantity and poor quality of self-produced water resources, and is a typical resource type water-deficient area. For a long time, the contradiction between the apparent water resource shortage and the water resource supply and demand caused by the hidden resource waste caused by the low efficiency of agricultural irrigation water is increasingly sharp, and the continuous and stable development of Ningxia economy and society is severely restricted. A large number of production practices show that the control of drainage and the implementation of ditch water recycling are an effective way for the open source throttling of irrigation agriculture.
The soil body is an aggregation of weakly consolidated particles, and sometimes two-dimensional or three-dimensional continuous media are needed to improve the integrity of the soil body and improve the tensile property and the shear resistance of the soil body. The geosynthetic material is used as a novel geotechnical engineering material and is placed in the soil body, on the surface or between soil bodies of all layers to play a role in strengthening or protecting the soil body. The geotextile woven bags made by sewing are filled with soil, sand, broken stone, construction waste or other materials to form bags, and then the geotextile bag filling technology and derivative technology for reinforcing the foundation are laid according to a certain arrangement mode, are rapidly developed in recent years, and become one of the hotspots of the research and application of geosynthetic material subjects. The plastic steel sheet pile has the advantages of light weight, ageing resistance, corrosion resistance, quick construction, long service life and the like, also has the advantages of small construction occupied area, convenient transportation and stacking, environmental protection, no pollution, small influence on the surrounding environment and contribution to protecting the ecological environment, and is widely applied to natural disaster rescue and relief work and engineering construction such as flood control, waterlogging drainage, landslide prevention, debris flow prevention and the like. The micro-pile has the advantages of simple technology, convenient construction, suitability for narrow construction operation areas, strong adaptability to soil layers, flexible pile position arrangement and high bearing capacity, is widely applied to various civil and architectural engineering in recent years, and is successfully applied to foundation pit excavation and support, ground subsidence repair, roadbed reinforcement, slope reinforcement and the like.
Therefore, the geosynthetic material is combined with the plastic steel sheet pile, the concrete micro pile and the timber pile, a new method for treating the drainage channel side slope containing the quicksand layer is explored, a stable agricultural irrigation drainage system is constructed, and the purpose of ditch water recycling is achieved by means of good drainage and filtration performances of geotextiles.
Disclosure of Invention
The invention mainly aims to provide a method for treating collapse of a drainage channel side slope in a quicksand stratum and purifying and recycling drainage water, which can effectively solve the problems in the background technology.
In order to achieve the purpose, the invention adopts the technical scheme that:
the method for treating quicksand stratum drainage channel side slope collapse and ditch water purification and reuse comprises the following steps of sewing a geotextile bag, filling corresponding fillers into the geotextile bag to form a geotextile filling bag, and building and protecting the drainage channel side slope, and specifically comprises the following steps:
the method comprises the following steps: filling preparation of the geotechnical filling bag: selecting white artificial leather base cloth as geotextile to sew the geotextile bags, and filling corresponding fillers in the geotextile bags to form geotextile filling bags for building and protecting the drainage channel slopes;
step two: paving a foundation:
for the side slope containing the quicksand stratum, 3 types of high-strength plastic steel composite sheet piles, concrete micro piles or wood piles can be selected according to specific conditions to support and block the foundation;
s1, adopting a plastic steel sheet pile with the length of 2.5m and the thickness of 6mm, punching the plastic steel sheet pile, vertically driving the plastic steel sheet pile into a side slope at the lowest water level of a channel, exposing a slope surface by 40cm, and preferably adopting a pile-feeding driving method for driving the plastic steel sheet pile, wherein the positioning deviation of the plastic steel sheet pile is less than 30mm, the marking deviation of the positioning points of the pile-feeding pile and the plastic steel sheet pile is not more than 50mm during pile driving positioning, the perpendicularity deviation in the pile driving process is not more than 5H/100, and a high-strength plastic steel combined sheet pile supporting geotextile bag foundation is laid behind the plastic steel sheet pile;
s2, the diameter of the concrete micro-pile is 0.1m, the height of the concrete micro-pile is 2.5m, the pile body is composed of cement mortar poured under pressure and stiffening materials, the stiffening materials are reinforcing steel bars, a row of reinforcing steel bars are vertically arranged at the lowest water level of the trench, the distance between the top of the pile and the bottom of the trench is 35cm, a bamboo board is laid close to the pile, the length of the bamboo board is 70cm, and a concrete micro-pile supporting and retaining geotextile bag foundation is laid behind the bamboo board;
s3, driving wood piles with the diameter of 0.1m and the height of 2m at the position 0.7m away from the groove toe every 35cm along the water flow direction of the groove, laying a bamboo plate with the length of 70cm close to the wood piles with the top of the pile 40cm away from the groove bottom, and laying a wood pile retaining geotextile bag foundation behind the bamboo plate;
for the side slope without the quicksand stratum, digging the foundation part to a position 15cm below a water level, taking the three soil engineering bags as a paving unit, and paving the side slope in a cross joint mode, wherein the thickness of the building protection layer is four layers of soil engineering filling bags;
step three: after the foundation part is paved, rolling and leveling are carried out, then the geotextile bags of the part above the foundation are paved, each layer is retracted by 20cm, 6 layers are paved, staggered joints are paved among the layers, manual leveling work is carried out when each layer is paved, a staggered joint paving mode is adopted among the geotextile bag layers, gaps of about 4-8cm are reserved among the bag bodies, the gaps are backfilled by soil materials with the same lithology as the filling materials, and the adjacent bag bodies are connected by adopting specific connecting buckles, and the connecting buckles form a triangular connecting structure;
step four: and after paving is finished, leveling the side slope.
Further, in the step one, white artificial leather base cloth is selected as geotextile, which has the performances of salt and alkali corrosion resistance, ultraviolet corrosion resistance and resistance to dry, wet and freeze thawing influences, and corresponding fillers in the geotextile filling bag are respectively as follows: fill material in the part geotechnical bag of bank protection basis mainly uses the grit material of no edges and corners as the main, and the material in the part geotechnical bag above the bank protection basis is for purifying matrix.
Further, the purification substrate is raw soil for slope excavation, and 4% of corncob grinding mixture is added.
Furthermore, in the second step, the slope containing the quicksand stratum is subjected to foundation support by adopting the high-strength plastic-steel composite sheet pile, the concrete micro pile and the wood pile, so that the purposes of improving the stability of the slope containing the quicksand layer drainage channel and purifying and recycling ditch water are achieved, the geotextile bags are paved between the slope and the piles, the structural layers are two-layer double-row paving, the paving mode is staggered paving of an upper layer and a lower layer, and the paving thickness is three layers.
Further, in step S1, holes are punched in the cross section of the plastic steel sheet pile in a staggered manner, the holes are vertically punched in the side slope at the lowest water level of the trench along the water flow direction of the trench, the hole diameter is 1.5cm, the distance between the hole and the connection position of the plastic steel sheet pile is larger than 2cm, the drainage requirement of the trench of the farmland can be met, the stability of the side slope of the trench containing a flowing sand layer can be improved, and 3 geotextile bags with the width of 70cm and the height of 15cm are laid behind the plastic steel sheet pile to form a foundation of the concrete micro-pile retaining geotextile bag.
Further, in step S3, the geotextile bag foundation structure is laid in two layers and two rows, the laying mode is staggered laying of the upper layer and the lower layer, and the laying thickness is three layers.
Further, in the second step, for the side slope without the quicksand stratum, 4 layers of soil engineering bags are staggeredly built at the groove toe position to form a toe supporting and retaining soil engineering bag foundation, wherein the width is 105cm, and the height is 60 cm.
Further, in step three, basic part paves the back of accomplishing, rolls the flattening, adopts the butt joint overlap joint mode to step and protects 6 layers, and height 90cm, every layer indentation 20cm, the mode of paving of the 4 lower layers of geotechnological bags is: the long side is vertical to the water flow direction of the channel, and the long side of the upper 2 layers is parallel to the water flow direction of the channel.
Compared with the prior art, the invention has the following beneficial effects:
1. for the channel with the quicksand stratum, wood (willow) piles, concrete micro piles or plastic steel plate piles are combined with soil engineering bags for building and protecting, so that the stability of the channel side slope with the quicksand stratum can be effectively improved.
2. The plastic steel composite sheet pile is applied to farmland drainage channel management, the cross section of the plastic steel composite sheet pile is punched in a staggered mode, and the plastic steel composite sheet pile is combined with the soil engineering bag to manage the channel side slope, so that the drainage requirement of the farmland channel can be met, and the stability of the channel side slope containing the flowing sand layer can be enhanced.
3. The woven bag made of the new material is adopted, and the raw soil is excavated on site and mixed with a machine to be filled to prepare the geotechnical filling bag with the functions of adsorption, filtration and water purification, so that the technical problem of purification and reuse of the drainage ditch water of the farmland drainage ditch is successfully solved.
4. Adopt special triangle-shaped connector link to overlap joint between bag layer and the bag layer, strengthened the overall stability of loose single bag body originally.
5. The geotextile bag made of the new material has strong advantages in saline-alkali corrosion resistance, dry-wet and freeze-thaw cycle corrosion resistance, ultraviolet corrosion resistance and other aspects, and the durability and the deterioration index of the geotextile bag are far higher than those of common bag bodies made of other materials.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.
In the drawings:
fig. 1 is a cross section view of a bag-type masonry protection for a side slope retaining geotextile bag foundation with a quicksand layer channel according to an embodiment of the invention.
FIG. 2 is a schematic diagram of cross-sectional staggered punching of a high-strength plastic-steel composite sheet pile according to an embodiment of the invention.
Fig. 3 is a longitudinal sectional view of the geotextile bag building shield of the high-strength plastic-steel composite sheet pile retaining geotextile bag foundation according to the embodiment of the invention.
Fig. 4 is a longitudinal sectional view of the geotextile bag building shield for supporting and retaining the geotextile bag foundation by the concrete micro-pile according to the embodiment of the invention.
Fig. 5 is a longitudinal sectional view of the geotextile bag building protection of the geotextile bag foundation supported by the wood (willow) piles according to the embodiment of the invention.
Fig. 6 is a schematic view of laying of the 1 st and 3 rd layers of the side slope retaining masonry bag foundation with the quicksand layer channel in the embodiment of the invention.
Fig. 7 is a schematic view of laying the 2 nd layer of the side slope retaining masonry protection bag foundation with the quicksand layer channel in the embodiment of the invention.
Fig. 8 is a cross-sectional view of a foundation bag of a retaining geobag of a geobag for a side slope without a quicksand trench according to an embodiment of the invention.
Fig. 9 is a schematic view of laying of the 1 st and 3 rd layers of the retaining and masonry foundation without the sandflow layer trench slope geotextile bags in the embodiment of the invention.
Fig. 10 is a schematic view of laying of the 2 nd and 4 th layers of retaining and protecting foundations made of geotextile bags for side slopes without quicksand layers in the embodiment of the invention.
Fig. 11 is a longitudinal sectional view of the geotextile bag retaining geotextile bag foundation geotextile bag protector of the embodiment of the invention.
Fig. 12 is a top view of the geotextile bag arrangement above the foundation of the embodiment of the present invention.
Fig. 13 is a schematic view of a geotextile bag connection structure according to an embodiment of the present invention.
Labeling components: 1. a soil engineering filling bag; 2. a connecting buckle; 3. a trench side slope; 4. a channel; 5. a wood pile is used for supporting and retaining the foundation of the soil engineering bag; 6. a triangular connecting structure; 7. a high-strength plastic steel composite sheet pile retaining geotextile bag foundation; 8. high-strength plastic steel composite sheet piles; 9. piling wood; 10. a concrete micro pile supports and blocks a geotextile bag foundation; 11. concrete micro-piles; 12. four layers of geotechnical filling bags.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
As shown in fig. 1-13, the method for treating quicksand stratum drain channel slope collapse and channel water purification and reuse, which comprises the following steps of sewing a geotextile into a geotextile bag, filling corresponding fillers into the geotextile bag to form a geotextile filling bag 1, and building and protecting a drain channel slope 3:
the method comprises the following steps: filling preparation of the geotechnical filling bag 1: selecting white artificial leather base cloth as geotextile to sew the geotextile bags, and filling corresponding fillers in the geotextile bags to form geotextile filling bags 1 for building and protecting the drainage channel side slopes 3; the white artificial leather base cloth is selected as the geotextile, has the performances of salt and alkali erosion resistance, ultraviolet erosion resistance and resistance to dry, wet and freeze thawing influences, and the corresponding fillers in the geotextile filling bag 1 are respectively as follows: filling materials in the geotechnical bags on the slope protection foundation mainly comprise sandstone materials without edges and corners, and materials in the geotechnical bags on the slope protection foundation are used as purification substrates; the purification substrate is the original soil excavated from the side slope, and 4% of corncob crushed mixture is added;
the woven bag sewn by the new material is adopted, and the raw soil is excavated on site and mixed and filled by a machine to prepare the geotechnical filling bag with the functions of adsorption, filtration and water purification, so that the technical problem of purification and reuse of the drainage ditch water of the farmland drainage ditch is successfully solved; the geotextile bag made of the new material has strong advantages in saline-alkali corrosion resistance, dry-wet and freeze-thaw cycle corrosion resistance, ultraviolet corrosion resistance and other aspects, and the durability and the deterioration index of the geotextile bag are far higher than those of common bag bodies made of other materials;
step two: paving a foundation:
for the side slope containing the quicksand stratum, a high-strength plastic steel composite sheet pile 8, a concrete miniature pile 11 or a timber pile 93 type can be selected according to specific conditions to support and block the foundation; the side slope containing the quicksand stratum adopts a high-strength plastic steel combined sheet pile 8, a concrete micro pile 11 and a wood pile 9 to support and block the foundation, so as to achieve the purposes of improving the stability of the side slope containing the quicksand stratum drainage channel 4 and purifying and recycling ditch water, a soil engineering bag is paved between the side slope and the piles, the structural layers are two-layer double-row paving, the paving mode is staggered and staggered paving of an upper layer and a lower layer, and the paving thickness is three layers;
for the channel with the quicksand stratum, wood (willow) piles, concrete micro piles or plastic steel sheet piles are combined with soil bags for building and protecting, so that the stability of the channel side slope with the quicksand stratum can be effectively improved;
s1, adopting a plastic steel sheet pile with the length of 2.5m and the thickness of 6mm, punching the plastic steel sheet pile, vertically driving the plastic steel sheet pile into a side slope at the lowest water level of the trench 4, exposing a slope surface by 40cm, and preferably adopting a pile feeding driving method for driving the plastic steel sheet pile, wherein the positioning deviation of the plastic steel sheet pile is less than 30mm, the marking deviation of the positioning points of the pile feeding and the plastic steel sheet pile is not more than 50mm when in driving positioning, the verticality deviation in the driving process is not more than 5H/100, and a high-strength plastic steel combined sheet pile supporting and blocking geotextile bag foundation 7 is laid behind the plastic steel sheet pile; the cross section of the plastic steel sheet pile is punched in a staggered mode, the plastic steel sheet pile is vertically driven into a side slope at the lowest water level of the trench 4 along the water flow direction of the trench 4, the aperture is 1.5cm, the distance between every two adjacent plastic steel sheet piles is 2cm, the distance between every two adjacent plastic steel sheet piles is more than 2cm, the drainage requirement of the trench 4 of a farmland can be met, the stability of the side slope of the trench 4 containing a sand layer can be improved, 3 layers of soil bags with the width of 70cm and the height of 15cm are paved behind the plastic steel sheet piles, and a concrete micro-pile supporting and blocking soil bag foundation 10 is formed;
the plastic steel composite sheet pile is applied to farmland drainage channel management, holes are formed in the cross section of the plastic steel composite sheet pile in a staggered mode, and the plastic steel composite sheet pile is combined with a soil engineering bag to manage a channel side slope, so that the drainage requirement of a farmland channel can be met, and the stability of the channel side slope containing a quicksand layer can be enhanced;
s2, the diameter of the concrete micro-pile 11 is 0.1m, the height is 2.5m, the pile body is composed of cement mortar poured under pressure and stiffening materials, the stiffening materials are reinforcing steel bars, a row of reinforcing steel bars are vertically arranged at the lowest water level of the trench 4, the distance between the top of the pile and the bottom of the trench is 35cm, a bamboo board is laid close to the pile, the length of the bamboo board is 70cm, and the concrete micro-pile supporting earth bag foundation 10 is laid behind the bamboo board;
s3, driving a timber pile 9 into the position 0.7m away from the toe of a groove 4 along the water flow direction of the groove 4 at a distance of 0.1m and a height of 2m at intervals of 35cm, wherein the distance between the top of the pile and the bottom of the groove is 40cm, laying a bamboo board close to the timber pile 9, the length of the bamboo board is 70cm, and laying a timber pile retaining geotextile bag foundation 5 behind the bamboo board; the geotextile bag foundation structure is paved in two layers and two rows, the paving mode is staggered paving of an upper layer and a lower layer, and the paving thickness is three layers;
for the side slope without quicksand stratum, digging the foundation part to 15cm below the water level, taking three geotextile bags as a paving unit, and paving in a cross joint way, wherein the thickness of the building protection is four layers of geotextile filling bags 12; for the side slope without the quicksand stratum, building and protecting 4 layers at the toe of the trench 4 by using soil engineering bags in a staggered manner to form a toe retaining soil engineering bag foundation, wherein the width is 105cm, and the height is 60 cm;
step three: after the foundation part is paved, rolling and leveling are carried out, then the geotextile bags of the part above the foundation are paved, each layer is retracted by 20cm, 6 layers are paved, staggered joints are paved among the layers, manual leveling work is carried out when each layer is paved, a staggered joint paving mode is adopted among the geotextile bag layers, gaps of about 4-8cm are reserved among the bag bodies, the gaps are backfilled by soil materials with the same lithology as the filling materials, the adjacent bag bodies are connected by adopting specific connecting buckles 2, and the connecting buckles 2 form a triangular connecting structure 6; after basic part laid is accomplished, roll the flattening, adopt the butt joint overlap joint mode to protect 6 layers, high 90cm, every layer indentation 20cm, the mode of laying of 4 layers of geotechnological bags of basement does: the long side is vertical to the water flow direction of the channel 4, and the long side of the upper 2 layers is parallel to the water flow direction of the channel 4;
the bag layers are lapped by adopting special triangular connecting buckles, so that the integral stability of the original loose single bag body is enhanced;
step four: and after paving is finished, leveling the side slope.
The present invention will be further described with reference to the accompanying drawings.
As shown in fig. 1-13, the method comprises a quicksand stratum plastic-steel composite sheet pile 8, a concrete micro pile 11, a wood pile retaining geotextile bag foundation 5 building and protecting mode and a non-quicksand stratum geotextile bag retaining geotextile bag foundation building and protecting mode.
FIGS. 1 to 7 show the supporting and retaining method of quicksand stratum foundation, and FIG. 3 shows the vertical section of the high-strength plastic-steel composite sheet pile supporting and retaining geotextile bag foundation 7, which uses a plastic-steel sheet pile with a length of 2.5m and a thickness of 6mm, the cross section of the plastic steel sheet pile is punched in a staggered mode, the plastic steel sheet pile is vertically driven into the side slope at the lowest water level of the channel 4 along the water flow direction of the channel 4, the drainage requirement of the farmland channel 4 can be met, the stability of the channel side slope 3 containing the flowing sand layer can be improved, the slope surface is exposed by 40cm, the plastic steel sheet pile driving method is adopted, the plastic steel sheet pile positioning deviation is smaller than 30mm, when the pile is driven and positioned, the mark deviation of the positioning points of the pile feeding and the plastic steel sheet pile is not more than 50mm, the verticality deviation in the pile driving process is not more than 5H/100, 3 layers of soil bags with the width of 70cm and the height of 15cm are paved behind the plastic steel sheet pile, and the concrete micro-pile retaining soil bag foundation 10 is formed. Fig. 4 is a longitudinal sectional view of a geotechnical bag foundation 10 for supporting and retaining concrete micro-piles, wherein the diameter of each concrete micro-pile 11 is 0.1m, the height of each concrete micro-pile is 2.5m, a pile body is composed of pressure-poured cement mortar and stiffening materials, a row of the concrete micro-piles is vertically arranged at the lowest water level of a channel 4, the distance between the concrete micro-piles and the groove bottom is 35cm, a bamboo plate is laid close to each pile, the length of the bamboo plate is 70cm, and the geotechnical bag foundation is laid behind the bamboo plate. Fig. 5 is a longitudinal sectional view of the timber pile retaining geotextile bag foundation 5, wherein timber piles 9 are 0.1m in diameter and 2m in height, timber piles 9 are driven into the position 0.7m away from the toe of a trench 4 at intervals of 35cm along the water flow direction of the trench 4, the tops of the timber piles are 40cm away from the bottom of the trench, bamboo boards are laid close to the timber piles 9, the length of the bamboo boards is 70cm, and the geotextile bag foundation is laid behind the bamboo boards. The geotextile bag foundation structure is laid in two layers and two rows, the laying mode is staggered laying of an upper layer and a lower layer, and the laying thickness is three layers.
Fig. 8-11 show a non-quicksand stratum geobag supporting and retaining geobag foundation building and protecting mode, wherein 4 layers are built at the groove 4 toe by means of the staggered geobag seam and protection, so that a toe supporting and retaining geobag foundation is formed, the width is 105cm, and the height is 60 cm.
Fig. 12 is a top view of the geotextile bag arrangement above the foundation of the embodiment of the present invention. After basic part laid is accomplished, roll the flattening, adopt the butt joint overlap joint mode to protect 6 layers, high 90cm, every layer indentation 20cm, the mode of laying of 4 layers of geotechnological bags of basement does: the long side is perpendicular to the water flow direction of the channel 4, and the long side of the upper 2 layers is parallel to the water flow direction of the channel 4. And carrying out manual leveling work every time when one layer is paved, and carrying out the leveling work of the side slope after the paving is finished. Fig. 13 is a schematic view of a geotextile bag connection structure according to an embodiment of the present invention.
Experiments prove that the permeability coefficient of the combination structure of the geotextile bags can reach 1.45 multiplied by 10-2cm﹒s-1Far greater than the permeability coefficient of soil 4.63 multiplied by 10-5cm﹒s-1. The prototype monitoring test of building and protecting the side slope of the farmland drainage ditch in different building and protecting modes is carried out in a typical test section selected in the bronze gorge city, comprehensive verification and analysis show that the geotextile bag building and protecting mode can limit the deformation of the side slope, and the effect of improving the overall stability of the side slope is better.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
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