KR20040037395A - Construction method of stabilization the four sides of waste landfill - Google Patents

Abstract

PURPOSE: A stabilization method for a slope in a landfill is provided to prevent soil pollution and underground water pollution caused by the leakage of leachate. CONSTITUTION: The stabilization method for a slope in a landfill comprises the steps of surfacing a slope composed of soil or bedrock, then installing a geo-synthetic soil water stop, installing a smooth geo-membrane sheet on the geo-synthetic soil water stop, and installing a drainage member on the smooth geo-membrane sheet. The frictional geo-membrane is installed between the geo-synthetic soil water stop and the drainage member by placing bubble formed by extruding from a tubular sheet extruder or high-density polyethylene bubble formed by extruding from a tubular sheet extruder in an open cut sheet and welding thermoplastic resins to the surface.

Description

Construction method of stabilization the four sides of waste landfill}

The present invention relates to a method for stabilizing a waste landfill slope, and more specifically, to stabilize a slope system of a landfill and to steep slope slopes, thereby securing landfill capacity and preventing breakage of a civil fiber clay order material, which is a secondary order material. The present invention relates to a method for stabilizing a waste landfill slope in which a friction type geomembrane is buried to prevent acupuncture leakage.

Geosynthetics was used mainly in the early 1970s for the purpose of preventing and filtration of earth and sand. After that, its field of application was gradually expanded for the purpose of separating, reinforcing or draining the ground. It has been extended to the purpose of preventing cracks, protecting ground structures, and absorbing shock. In addition to expanding the usability of geosynthetic products, academia has tried to prevent soil contamination by leachate by applying geosynthetic materials to landfills. Leachate is a liquid formed by the landfill waste interacting with water generated by rain or snow. Leachate is a major cause of soil and groundwater contamination. It has been used in sanitary landfills as a barrier and drain.

The main functions of the geosynthetic fibers include drainage, filters, separation, reinforcement, and ordering functions, and geotextiles applied to the site perform one or more functions. In particular, as the field of application of geotextiles expands, complex geotextiles have been researched and developed in order to perform two or more functions. Recently, geomembrane and geotextile clay water repellents have been used as lower materials in landfills. It is prescribed to use. Most of the landfills that are being constructed in Korea are located in the valley areas of the mountains.

The construction process of the conventional geotextiles ordering system is to clean the surface of the slope of soil or rock without irregularities. After completion of the cleanup of the sloped surface as described above, install the geosynthetic clay liner and install the smooth smooth geomembrane sheet on the geotextile clay liner, and drainage material on the smooth smooth geomembrane sheet. It is constructed to prevent damage to the smooth and smooth geomembrane sheet.

Conventional waste landfill slope stabilizing construction method having the structure as described above is using a smooth geomembrane smooth surface due to the difficulty in manufacturing geomembrane used in geotextiles ordering system.

In addition, since the friction of the geotextile contact cannot be arbitrarily designed to induce the fracture surface, when the garbage is dumped in the geotextile ordering system, the geomembrane and the geotextile clay ordering material can be swept away at the same time, causing problems in the stability of the slope system and the ordering system May cause. This causes a problem that the landfill capacity of the waste is reduced by lowering the slope of the landfill.

The present invention has been made in view of the above-mentioned conventional problems, and its object is to randomly design the minimum shear friction cross section in the slope stabilization and ordering system of the waste landfill and induce shear failure in the geomembrane and geotextile clay fillers. It provides a construction method to prevent soil pollution and groundwater pollution caused by leakage of leachate by protecting the secondary water.

The object of the present invention is to install a geosynthetic clay ordering material after the surface clearing so that there is no irregularities on the slope of soil or rock, and to install the smooth smooth geomembrane sheet of the surface on the geotextile clay ordering material, the smooth smooth In the method of stabilizing construction of slopes of landfills where drainage materials are installed on geomembrane sheets

Friction type formed by fusion of thermoplastic resin powder on the surface of a sheet in which a bubble formed by extruding from a tubular sheet extrusion device or a bubble of high-density polyethylene material formed by extruding from a tubular sheet extrusion device is formed between a geotextile clay filler and a drain material. Waste landfill slope stabilization construction method characterized in that the geomembrane is installed.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

After clearing the surface of soil or rock without irregularities, install geotextile clay liner and install smooth geomembrane sheet with smooth surface on top of the geotextile liner, and on top of the smooth smooth geomembrane sheet In the landfill slope stabilization construction method, in which waste material is installed, a sheet formed by extruded from a tubular sheet extrusion device or a bubble of high-density polyethylene material extruded from a tubular sheet extrusion device is formed between a geotextile clay filler and a drain material. The friction type geomembrane is formed by fusion of thermoplastic resin powder on the surface.

The friction type geomembrane is cylindrically shaped in a closed circular die, blows compressed air from the center of the die, expands to a predetermined size, and is molded while blowing cooling air from an air ring from the outside. On the other hand, the cylindrical bubble during molding rises and cools, and the thermoplastic resin powder is fused at the cooling solidification line of the bubble. The thermoplastic resin powder may be made of a material such as a bubbled sheet, and PE may be used.

Surface roughness test results of the friction type geomembrane and the conventional smooth type geomembrane by the RTH FTSS device can be seen as shown in Table 1.

division Measurement result (㎛) maximum at least Average The present invention 356.27 50.79 225.73 Species 205.40 31.35 139.04

In the case of smooth geomembrane with a smooth surface of the conventional surface, the range of 0.36㎛ ~ 2.34㎛ was shown, and the frictional geomembrane constructed in the present invention increased about 140 times the surface roughness than the conventional smooth geomembrane. The range of 50.79 micrometers-356.27 micrometers was shown.

When friction type geomembrane having surface roughness as described above is installed, the contact friction characteristics with the geotex awning are shown in Table 2.

division Peak Residual Apparent adhesion (kg / cm ² ) Internal friction angle (°) Apparent adhesion (kg / cm ² ) Internal friction angle (°) The present invention 0.128 22.3 - - Species 0.024 6.6 0.029 5.4

When the friction type geomembrane having the surface roughness as described above, the contact friction characteristics with the geosynthetic clay liner are shown in Table 3.

Clay Order division Peak Ressidual Apparent adhesion (kg / cm ² ) Internal friction angle (°) Apparent adhesion (kg / cm ² ) Internal friction angle (°) B1- Immersion Species 0.167 9.490 0.156 8.870 B1- Immersion The present invention 0.161 21.49 0.093 16.84 B2- Immersion Species 0.079 5.130 0.080 4.320 B2- Immersion The present invention 0 19.76 0.006 14.96 B2-dry Species 0.080 17.42 0.075 14.09 B3- Immersion Species 0.055 3.944 0.039 3.091 B3- Immersion The present invention 0.243 6.365 0.186 5.113 B3-dry Zhong Le 0.025 14.17 0.045 8.222

In addition, when the centrifugal model test of the present invention, the conventional method and the friction type geomembrane is shown as shown in Table 4.

Slope (height: length) Conditions of Geomembrane Condition of Geosynthetic Clay Order Breaking g-level stability Vertical displacement (mm) 1: 3 Species dry 90 Destruction 31.53 Saturated 50 Destruction 25.16 This bill dry 90 Nondestructive 7.09 Saturated 95 Nondestructive 11.16 1: 1.5 Species dry 41 Destruction 26.92 Saturated 35 Destruction 32.95 The present invention dry 90 Nondestructive 8.42 Saturated 95 Nondestructive 17.91

The results shown in Table 4 show that when the friction type geomembrane according to the method of the present invention is installed, sliding does not occur, but only vertical displacement occurs. Occurred.

On the other hand, it can be seen that the analysis results by PS STABL5M, which is a program by the limit equilibrium analysis method, are shown in Table 5.

Slope 1: 1.5 1: 3 Geomembrane form Species The present invention Species The present invention Clay Order Conditions dry saturation dry saturation dry saturation dry saturation Breaking g-level 41 35 Nondestructive Nondestructive 90 50 Nondestructive Nondestructive Slope angle (β) 33.69 ° 18.43 ° Inner friction angle of soil (φ) 25 ° 25 ° Contact friction angle (δ) 8.22 2.4 22.3 16.84 8.22 2.4 22.3 16.84 Adhesion (c, kg / cm ² ) 0.045 0.01 0.128 0.093 0.045 0.01 0.128 0.093 a 11.67 8.5 35.92 32.41 18.73 16.52 28.14 25.48 b -9.62 -3.177 -43.21 -36.48 -16.51 -13.94 -45.37 -38.71 c 2.088 0.166 5.070 4.39 3.25 2.88 7.54 5.01 FS 0.412 0.311 0.071 1.000 0.585 0.483 1.485 1.376

Regardless of the conditions of the geosynthetic clay material, the safety factor is less than 1.0, and the construction method is applied in the worst case condition in which the slope is steep and the geosynthetic clay water repellent material is installed. Appeared to be stable.

The present invention constructed as described above randomly designed the minimum shear friction cross section in the slope stabilization and order system of the landfill and induces shear failure in the geomembrane and geotextile clay liner to protect the secondary liner by leaking leachate. It is effective in preventing soil pollution and groundwater pollution.

Claims (1)

After clearing the surface of soil or rock without irregularities, install geotextile clay liner and install smooth geomembrane sheet with smooth surface on top of the geotextile liner, and on top of the smooth smooth geomembrane sheet In the landfill slope stabilization construction method installed drainage material, Friction type geomembrane formed by fusion of thermoplastic resin powder on the surface of a sheet in which a bubble formed by extruding from a tubular sheet extruder or a bubble of high density polyethylene formed by extruding from a tubular sheet extruder is interposed between a geosynthetic clay filler and a drain material. Waste landfill slope stabilization construction method characterized in that the installation.