Method to protect structure built on clay ground against flooding

FIELD: mining, particularly to protect building structure built of clay ground against flooding in the case of bedded mineral deposit mining under the structure.

SUBSTANCE: method involves cutting dewatering wells in maximal ground subsidence zones over breakage heading center; drilling horizontal drainage wells from dewatering wells at depth, which is less than distance to neutral line at ground layer bent, but is greater than structure foundation erection depth. Well lengths are determined from mathematical expression with taking into consideration parameters of layer cutting and ground shifting process characteristics.

EFFECT: increased clay ground dewatering and structure protection against flooding.

2 dwg

 

The invention relates to mining and can be used to protect structures in areas with clay soils when developing under them bedded deposits of minerals.

There is a method of lowering of the groundwater in areas with low infiltration characteristics of soils by excavation dewatering wells and the drilling of them horizontal or inclined (at a small angle to the horizon) water wells (Reference drainage rocks. /Edited by Starchenko I.K. - M.: Nedra, 1984. - 572).

The disadvantage of this method of lowering the groundwater level is that it does not provide effective drainage of soils with low filtration characteristics, i.e. clays and loams.

The objective of this technical solution is to develop ways to effectively implement the water in the clay soils at the job mining works that will allow for protection of buildings from flooding.

To solve this problem is proposed, vodopadnyaya wells take place in the areas of maximum subsidence of the surface above the middle of cleaning formulation, and horizontal drainage wells to drill at a depth of hSLE.determined from the relation hf<hSLE<hnwhere hf- g is ubina of laying the foundations of structures, hnthe depth of the location of neutral axis in bending of the layer of soil, and the length of the wells lSLEbe determined from the equality

lSLE=(D/2+Hctgδ0)/sinαsinω,

where D is the width of longwall production;

H - depth of reservoir development;

δ0- edge corner of rock strata;

α - the angle of inclination of the borehole at the expense of undermining;

ω - the acute angle between the axis of the borehole and the boundary of the coal pillar.

The method is illustrated by drawings, where figure 1 shows a vertical section of the strata of rocks and graph horizontal deformations of the earth surface at a part-time job, and figure 2 - plan of mining operations and the earth's surface.

Above the middle of the treatment plan generation 1 (see figure 1) at the point of maximum subsidence of the surface 2 are the well 3 to the power of hSLElayer 4 soil. From the well at a depth of hSLEless than the distance hnfrom the earth surface to neutral (bending) of line 5, in layer 4 of the soil, but greater than the depth of the foundations of the hfprotected buildings (not shown)in the direction of the coal pillar (in the plan) 6 are drilling horizontal wells 7, positioning them with a fan (see figure 2) and obseive their perforated pipes. The length of each hole is determined by the formula

l=(D/2+Hctg δ0)/sinαsinω,

where D is the width of Estoi production;

H - depth of reservoir development;

δ - edge angle;

α - the angle of inclination of the borehole at the expense of undermining;

ω - the acute angle between the axis of the borehole and the boundary of the coal pillar (in the plan).

As the result of pumping water from a well, the initial groundwater level Δ0(see figure 1) will be reduced to the position of Δ1. After carrying out the cleaning formulation 1 surface 8 on it will settle and the well 3 drops on the highest compared with other areas of the mould displacement value. The dotted lines show the position of the earth surface of the well, wells and groundwater levels before processing, solid - after jobs.

After processing due to the bending of the ground layer 4 directly above the seam in the bottom layer (below the neutral line 5) a zone of horizontal strains. Over the entire 6 above the neutral line 5 is formed in the area of horizontal sprains εgraph which is shown in the drawing. In this zone cracks (microcracks) 9, oriented parallel to the boundary pillar 6. In areas sprains increase the porosity of the soil and the filtration coefficient. As a result, the groundwater level will decrease to a value of Δ2.

Thus, the declining groundwater levels in this way is provided by: first - sedan whom I am well on a maximum value; secondly, increasing the porosity of the soil in the zone of tension below the neutral line above longwall production in the elongation zone above the neutral line over the whole; thirdly, the formation of cracks (microcracks) in the area stretching over the whole, which perform the role of horizontal drains between wells.

The way to protect undermined structures from flooding in areas with clay soils, including excavation dewatering wells and the drilling of these drainage wells, characterized in that vodopadnyaya wells are in the areas of maximum subsidence of the surface above the middle of cleaning formulation, and horizontal drainage wells are drilled at a depth of hSLEdetermined from the relationship

hf<hSLE<hn,

where hfthe depth of foundations of structures;

hnthe depth of the location of neutral axis in bending of the layer of soil, and the length of the wells lSLEdetermined from the equation

lSLE=(D/2+Hctgδ0)/sinαsinω,

where D is the width of longwall production;

H - depth of reservoir development;

δ0- edge corner of rock strata;

α - the angle of inclination of the borehole at the expense of undermining;

ω - the acute angle between the axis of the borehole and the boundary of the coal pillar.



 

Same patents:

FIELD: land reclamation, particularly to lay drain collection system in zones having ground water level above drainage laying level.

SUBSTANCE: method involves loosening fertile ground layer along drain laying axis; digging out channel; forming kerbs of excavated fertile ground; developing trench with chain working tool performing reverse rotation without ground lifting to surface; laying drainage pipe; backfilling the trench and the channel. Pulp consisted of crashed ground and water is extracted from lower trench part during drainage laying and the extracted pulp is supplied into channel or to surface of material used for trench backfilling. Device comprises basic machine, active working tool rotated in reverse direction, drainage pipe tray, box-like hopper with front cutting part, namely knife including post and plowshare. Suction dredge is installed inside the plowshare. Suction dredge has suction line communicated with zone between active working tool and knife through windows formed in front plowshare section. Pressure supply pipeline is communicated with distribution pipelines through intermediate pipeline and bypass gate operated by lever mechanism.

EFFECT: increased productivity and quality of drainage laying in water-saturated ground.

2 cl, 2 dwg

Drainage system // 2273692

FIELD: building and irrigation and drainage construction, for agricultural land, underground building parts, roads, and slopes reclamation.

SUBSTANCE: drainage system comprises perforated drainage pipe connected to drain web having extensions, filtering diaphragm and thickened parts in joint areas. The thickened parts are provided with through orifices for bolts receiving. Nuts are screwed on the bolts. Drainage pipe has horizontal slot with bent upwards ends in which drain web in installed.

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4 cl, 4 dwg

FIELD: hydraulic and reclamation building, particularly in permafrost zones.

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7 dwg

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3 dwg

Kratovil // 2237777
The invention relates to the reclamation technique and is intended for the construction of mole drainage in the rice fields and regulation of water, air and salt regimes of soils

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Drainage system // 2233941
The invention relates to agriculture and can be used in drainage melioration of lands

FIELD: hydraulic structures, particularly to consolidate slopes or inclinations to be eroded by ground waters.

SUBSTANCE: method for slope protection against landslide by diverting ground water with the use of drainage mine tunnel, through filters and upward dewatering wells involves excavating mine tunnel beginning from lower point of original ground under water-bearing horizons with tunnel elevation for water gravity flow, wherein mine tunnel extends parallel to direction of water flow from water-bearing horizons; excavating mine tunnel in different directions perpendicular to above flow direction; performing drilling vertical venting wells at tunnel ends beginning from original ground; drilling upward dewatering wells in water-bearing horizons; drilling vertical wells from original ground used as through filters crossing all water-bearing horizons; connecting thereof with cross-headings excavated from mine tunnel; installing valves at through filter ends; providing filtering members at place of intersection between upward dewatering wells and vertical wells with water-bearing horizons; forming water removal channel in mine tunnel and connecting thereof with original ground; drilling hydraulic observing wells beginning from original ground along line of through filters to control water level in water-bearing horizons.

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3 dwg

FIELD: land-reclamation, particularly drainage building in flooded irrigated lands.

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EFFECT: increased efficiency due to prevention of trench wall compaction, reduced power inputs.

7 dwg

FIELD: land-reclamation, particularly drainage building in flooded irrigated lands.

SUBSTANCE: method involves digging out channel in a single drainage machine pass by plow-type ditcher; dumping dug out fertile ground on channel brows in banks; digging out trench by operative tool of drainage machine; laying drainage pipe and covering thereof with ground; filling channel with fertile ground. Fertile ground layer is loosened before trench digging out along drainage pipe laying axis, wherein width of loosened ground strip is not less than operative tool width. Loosened ground is laid on channel brows. Trench is dug out by chain operative tool of narrow drainage machine performing reverse rotation and extracted ground is placed between trench walls and drainage machine bunker to cover drainage pipe moved into trench by guiding means. Trench is backfilled with ground with the use of two pairs of banks, which provides successive filling trench with ground and loosened fertile ground.

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7 dwg

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EFFECT: simplified structure, reduced labor inputs, provision of stable and effective protective system operation.

6 cl, 2 dwg

FIELD: irrigation building, particularly for laying collector-and-drainage system in the case of high ground water level (which is below plough-layer).

SUBSTANCE: method involves erecting pits along drain lines having inclined walls, wherein pit wall inclination is less than natural filtering material slope; filling the pits with filtering material along drain-installing machine travel so that filtering material volume is equal to that of blinding material; laying drain lines along pit axes with narrow-trench drain-installing machine after drain-installing machine bin is filled with filtering material up to level above ground water one, wherein drain laying rate exceeds rate of water percolation from watered ground of trench backfill; maintaining constant filtering material level in the bin due to supplying thereof from pit; additionally leveling and compacting upper filtering material surface. Device comprises main machine, active working tool with reverse operating chain rotation, guiding draining pipe chute and bin. Bin has front cutting part, expandable transversal walls and longitudinal walls bending in vertical plane. Receiving windows are formed in longitudinal walls. Splitter located in front of working tool is mounted on working tool frame and may perform vertical displacement. Splitter comprises plough and side wings enclosing working tool from two sides and connected to plough in front wing parts and to hinges in rear parts thereof. The hinges are connected to bin in front of receiving windows having additional wings installed behind receiving windows to allow installation angle change. Device has gate extending at 3°-4° angle to drain line and located in lower bin part.

EFFECT: increased capacity and drain laying quality, as well as following drainage operational efficiency.

4 cl, 4 dwg

Drainage system // 2273692

FIELD: building and irrigation and drainage construction, for agricultural land, underground building parts, roads, and slopes reclamation.

SUBSTANCE: drainage system comprises perforated drainage pipe connected to drain web having extensions, filtering diaphragm and thickened parts in joint areas. The thickened parts are provided with through orifices for bolts receiving. Nuts are screwed on the bolts. Drainage pipe has horizontal slot with bent upwards ends in which drain web in installed.

EFFECT: improved draining efficiency and increased speed of excessive water draining from ground.

2 dwg

FIELD: land reclamation, particularly to lay drain collection system in zones having ground water level above drainage laying level.

SUBSTANCE: method involves loosening fertile ground layer along drain laying axis; digging out channel; forming kerbs of excavated fertile ground; developing trench with chain working tool performing reverse rotation without ground lifting to surface; laying drainage pipe; backfilling the trench and the channel. Pulp consisted of crashed ground and water is extracted from lower trench part during drainage laying and the extracted pulp is supplied into channel or to surface of material used for trench backfilling. Device comprises basic machine, active working tool rotated in reverse direction, drainage pipe tray, box-like hopper with front cutting part, namely knife including post and plowshare. Suction dredge is installed inside the plowshare. Suction dredge has suction line communicated with zone between active working tool and knife through windows formed in front plowshare section. Pressure supply pipeline is communicated with distribution pipelines through intermediate pipeline and bypass gate operated by lever mechanism.

EFFECT: increased productivity and quality of drainage laying in water-saturated ground.

2 cl, 2 dwg

FIELD: mining, particularly to protect building structure built of clay ground against flooding in the case of bedded mineral deposit mining under the structure.

SUBSTANCE: method involves cutting dewatering wells in maximal ground subsidence zones over breakage heading center; drilling horizontal drainage wells from dewatering wells at depth, which is less than distance to neutral line at ground layer bent, but is greater than structure foundation erection depth. Well lengths are determined from mathematical expression with taking into consideration parameters of layer cutting and ground shifting process characteristics.

EFFECT: increased clay ground dewatering and structure protection against flooding.

2 dwg

FIELD: agriculture.

SUBSTANCE: method comprises lying the drain system with the converging drains on the control section, making observation gates within the converging drains, observing the parameters of the operation of the drain system, and comparing the parameters with the permissible values. The drains are provided with mouth and source sections of parallel drains. The lengths of the source and mouth sections of the parallel drains are chosen to be no less than the half of maximum distances between the sources and mouths of the converging drains, respectively.

EFFECT: enhanced precision of control.

1 cl, 1 dwg

FIELD: agriculture.

SUBSTANCE: method comprises making diverging drainage canals in the area to be drained. The mouths of the bed sections are connected with the collector through the underground pipelines. The flow rates are measured and water is sampled in the mouths of the underground pipelines and in the mouths of the canal section beds connected to the collector. The concentrations of contaminants in the samples is measured, and the results are compared with the permissible values.

EFFECT: reduced labor consumptions.

1 dwg

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