CN1194146C

CN1194146C - Comprehensive control method for underground water resource after being immersed by sea water

Info

Publication number: CN1194146C
Application number: CNB031110509A
Authority: CN
Inventors: 孙继勇; 封作臣
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-02-21
Filing date: 2003-02-21
Publication date: 2005-03-23
Anticipated expiration: 2023-02-21
Also published as: CN1433971A

Abstract

The present invention relates to a comprehensive control method for underground water resources after seawater intrusion, which solves the problems of the seawater intrusion and the development and the utilization of the underground water resources after seawater intrusion. Terrain and ground objects in control areas are comprehensively surveyed; the main flow position and the direction of a quaternary system alluvial fan are found out; residual hills with the shortest distance from the left band to the right bank of the main flow position of the quaternary system alluvial fan are further found out; a connecting line between two residual hills is used as the central line of a curtain grouting wall; curtain grouting begins with bedrock until grouting reaches the height of the sea level; a river dam is arranged at the estuary of rivers in the control areas; a plurality of sunk wells with large water inflow are arranged on the upstream side of the curtain grouting wall and the main flow position of the quaternary system alluvial fan; underground water containing chloride, which is extracted from the sunk wells, is treated by a water treatment device. The comprehensive control method of the present integration combines the technology together, performs the functions of increasing income, decreasing expenditure, getting rid of the stale and taking in the fresh, fundamentally solves the problem that the underground water resources are polluted after seawater intrusion, and restores the original ecological environment of the control areas.

Description

The comprehensive processing method of groundwater resources after the seawater invasion

Technical field

The invention belongs to a kind of phreatic water quality renewal, purifying treatment method, the comprehensive processing method of groundwater resources after particularly a kind of seawater invasion.

Background technology

Along with expanding economy, human increasing to the demand of water.Underground water since water quality better, shelf-stable, be convenient to development and utilization, therefore, the main object that becomes people's exploitation and utilize.For a long time, because people's blindness, nothing plan, immoderate exploiting groundwater have been upset the equilibrium relation that occurring in nature exists, thereby have been caused a series of harm, caused groundwater level decline, and developing into permanent decline by the flexibility decrease that allows, the drawdown funnel promptly appears, and the long-term existence of hopper zone, can make soil produce drying shrinkage because of lack of water, form ground settlement, cause ground subsidence, cause geological disaster.Particularly in the coastal area, phreatic adopting mended imbalance, not only caused geological disaster, also caused seawater invasion, promptly usually said inwelling.After the seawater invasion, fresh groundwater is infected is degree of saltiness water, destroyed original phreatic water quality fully, can not be applied to industrial and agricultural production and people life again, and degree of saltiness water also can rise to the face of land by means of the capillarity in the soil, thereby the salinity in the seawater is also taken to top, make the soil salinization, the ground desertification, serious destruction the ecological environment of coastal area.

The essential condition of seawater invasion is: 1, groundwater level must be lower than the sea level, and promptly coastal land exists the drawdown funnel; The passage that 2, seawater invasion will be arranged, in the stratum of promptly bordering on the sea by water permeability extremely strong, by the loose lithologic character stratum that coarse granule is formed, promptly have Quaternary Period alluvial fan to exist.Simultaneously, this passage ocean of must an end ining succession, an end and land funnel join, and form the terminal of inwelling.Summary is got up, and one will have water-head to exist exactly, and another is exactly the geological conditions that seawater invasion will be arranged, and both are indispensable.Therefore, as long as in the coastal area alluvial fan existence in the Quaternary Period is arranged, in case groundwater mining, seawater invasion is inevitable.

In area, coastal plain, the world, particularly economic relatively developed regions, the seawater invasion phenomenon is ubiquitous, also is difficult to administer.According to the introduction of hydrology department of China Ministry of Water Resources, China goes back the effective measures that Shang Weiyou administers seawater invasion now, even it is also considerably less to do the unit of this respect research work.At present, there is not practicable improvement method in the world yet.The American National geological survey expert of office China fir Fil moral professor came China's investigation to give lectures in 1992, when speaking of seawater and infect, once pointed out: the U.S. nineteen fifties with regard to continuous generation seawater invasion problem, arrive the seventies and caused social concerns, and the control measures that begins one's study, but in a single day seawater is invaded into, can not find a kind of power it is back.He thinks that the marine invasion phenomenon is the geology " canceration " that mankind's activity causes, and the marine invasion phenomenon can only be more and more fiery, so that cause soil and geological disaster, what good way the present world of its improvement developed country is not had yet.

Summary of the invention

The objective of the invention is to solve the problem that groundwater resources development is utilized after seawater invasion and the seawater invasion, the existing water conservancy project aspect of utilization technology, cut off the passage of seawater invasion, and the groundwater resources after the seawater invasion are purified, upgrade, the comprehensive processing method of groundwater resources after a kind of seawater invasion is provided.

The present invention is achieved in that

1, landform, the atural object of administering in the zone is comprehensively surveyed, find out the position of mainstream and the direction of alluvial fan in the Quaternary Period, and then find the nearest monadnock of alluvial fan position of mainstream left and right banks in the Quaternary Period;

2, with the center line of the line between two monadnocks as the curtain grouting wall, on the center line of curtain grouting wall, hole, pitch-row is 3～3.5 meters, hole depth is decided with bedrock relief, curtain grouting is initial by basement rock, from bottom to top, irritates to the sea level elevation, should overlap mutually between the grouting of two holes, form the curtain wall of interception seawater invasion;

3, the estuary in the river in administering the zone is provided with barrage, and interception surface water, heading up, increase surface water infiltrate potential energy;

4, on the position of mainstream of curtain wall upstream side, Quaternary Period alluvial fan, the big open caisson of several water yields is set, 2000～2500 meters of well spacings, well depth is to the bottom of alluvial fan in the Quaternary Period;

5, with water treatment facilities the chloride underground water that extracts from open caisson is handled, made it to reach the industrial and agricultural production water supply standard.

In order to make underground water enter in the open caisson smoothly, also have the ingot-shaped treatment hole on the borehole wall circle of open caisson, the filler in the ingot-shaped treatment hole has three kinds, and what filled borehole wall circle inboard is melon seeds stone, what filled the centre is coarse sand, and what filled in the borehole wall circle outside is medium coarse sand.

The present invention combines curtain grouting wall, barrage, open caisson and water treatment facilities, constituted the multi-purpose project that development and use groundwater resources in the zone are administered in seawater invasion, curtain wall has thoroughly cut off the passage of seawater invasion, seawater can not be poured in down a chimney again infect underground water, and protection underground water, do not allow it flow into the sea; Barrage interception surface water has been raised water level, and what increased surface water infiltrates potential energy and surface water to the dynamics of underground conversion, has strengthened phreatic replenishing, and helps eliminating funnel, increases phreatic accumulating, the formation groundwater reservoir; The big open caisson of water yield is set on the passage of seawater invasion, can extracts chloride underground water in a large number, the seawater of invasion is got rid of as early as possible, accelerated phreatic water quality and upgraded; Water treatment facilities then makes underground water that can not utilize, salinization become available water, directly supplies with industrial and agricultural production and uses; The present invention with above-mentioned technological synthesis together, just played the effect of increasing income and decreasing expenditure, exhaling the old and inhale the new, and make the underground water that infected by seawater constantly by dense to light, until thorough renewal, thereby thoroughly changed the present situation of administering in the zone, fundamentally solved the contaminated problem of groundwater resources after the seawater invasion, made and administer the zone and recover original ecological environment.

Description of drawings

Fig. 1 is the distribution map of ingot-shaped treatment hole on the caisson wall circle of the present invention;

Fig. 2 is the A-A sectional view of Fig. 1.

The specific embodiment

1, inboard landform, the atural object of administering in the zone in coastline is comprehensively surveyed, find out the position of mainstream and the direction of alluvial fan in the Quaternary Period, this step can be finished in conjunction with the Information integration analysis of administering the interior civilian well in zone, irrigation Electrical Well according to drilling data, and then find the nearest monadnock of alluvial fan position of mainstream left and right banks in the Quaternary Period, monadnock is at the coastal area ubiquity, connect by vein between the monadnock, can dwindle the phreatic engineering quantity of interception greatly by monadnock, play a multiplier effect;

2, with the center line of the line between two monadnocks as the curtain grouting wall, on the center line of curtain grouting wall, hole, pitch-row is 3～3.5 meters, the aperture is 119～219mm, hole depth is decided with bedrock relief, curtain grouting is initial by basement rock, from bottom to top, irritate, should overlap mutually between the grouting of two holes to the sea level elevation, form the curtain wall of interception seawater invasion, the material of curtain grouting determines that according to the formation lithology situation anti-dashing should be selected in the coarse granule stratum, and the hydraulic material of certain intensity arranged, as cement, water glass etc., centering, the fine sand stratum can be selected clay or swell soil etc. for use;

3, the estuary in the river in administering the zone is provided with barrage, the interception surface water, heading up increases the potential energy that infiltrates of surface water, described river comprises river and the seasonal river that water is arranged that water is arranged all the year round, barrage adopts rubber dam, also can adopt common dam, and it mainly plays the interception surface water, the effect of heading up, simultaneously, do not bring pressure again, guarantee the normal flood passage of flood in flood season to flood control;

4, at the curtain wall upstream side, the Quaternary Period alluvial fan position of mainstream on the big open caisson of several water yields is set, what determine the quantity of open caisson according to administering region area size and water source, quantity is not limit, 2000～2500 meters of well spacings, well depth is to the bottom of alluvial fan in the Quaternary Period, described open caisson is made of several layers borehole wall circle 1, borehole wall circle 1 has two kinds, a kind of radiation well casing and treatment hole of having, a kind of radiation well casing and treatment hole be not with, at soil layer or mud layer with not with the borehole wall circle 1 of radiation well casing and treatment hole, at layer of sand and below groundwater table, with the borehole wall circle 1 that has radiation well casing and treatment hole, treatment hole is evenly arranged on borehole wall circle, on, stagger mutually between lower floor's treatment hole, as shown in Figure 1, described treatment hole is an ingot-shaped treatment hole 2, as shown in Figure 2, filler in the ingot-shaped treatment hole 2 has three kinds, what filled borehole wall circle 1 inboard is melon seeds stone, what filled the centre is coarse sand, what filled in borehole wall circle 1 outside is medium coarse sand, filler is bundled into a certain size sand pocket with gauze, is about to sink at this joint borehole wall circle 1 be filled in the ingot-shaped treatment hole 2 when underground, and described radiation well casing evenly is provided with 4 on every layer of borehole wall circle 1, on, radiant tube on lower floor's borehole wall circle 1 staggers 30 ° mutually, uniform inlet opening on the radiation well casing, its end is pointed, so that construction;

5, with water treatment facilities the chloride underground water that extracts from open caisson is handled, make it to reach the industrial and agricultural production water supply standard, use for industrial and agricultural production, described water treatment facilities is the reverse osmosis membrane water treatment facilities, this device just uses but not permanent works a period, and after the underground water in administering the zone was cleaned fully, upgrades, water treatment facilities could, but, also be difficult to upgrade phreatic water quality in the improvement zone if there is not it then to be difficult in the recent period be benefited.

Claims

1, the comprehensive processing method of groundwater resources after a kind of seawater invasion is characterized in that it is achieved in that

1.1, to administer the zone in landform, atural object comprehensively survey, find out the position of mainstream and the direction of alluvial fan in the Quaternary Period, and then find the nearest monadnock of alluvial fan position of mainstream left and right banks in the Quaternary Period;

1.2, with the center line of the line between two monadnocks as the curtain grouting wall, on the center line of curtain grouting wall, hole, pitch-row is 3～3.5 meters, hole depth is decided with bedrock relief, curtain grouting is initial by basement rock, from bottom to top, irritates to the sea level elevation, should overlap mutually between the grouting of two holes, form the curtain wall of interception seawater invasion;

1.3, the estuary in the river in administering the zone is provided with barrage, interception surface water, heading up, increase surface water infiltrate potential energy;

1.4, on the position of mainstream of curtain wall upstream side, Quaternary Period alluvial fan, the big open caisson of several water yields is set, 2000～2500 meters of well spacings, well depth is to the bottom of alluvial fan in the Quaternary Period;

1.5, with water treatment facilities the chloride underground water that extracts from open caisson is handled, make it to reach the industrial and agricultural production water supply standard.

2, the comprehensive processing method of groundwater resources after the seawater invasion according to claim 1, it is characterized in that, on the borehole wall circle of open caisson, also has the ingot-shaped treatment hole, filler in the ingot-shaped treatment hole has three kinds, what filled borehole wall circle inboard is melon seeds stone, what filled the centre is coarse sand, and what filled in the borehole wall circle outside is medium coarse sand.