CN1075523A - Seepage-proof wall building method using underground pure clay and material - Google Patents

Abstract

The present invention relates to a kind of at the new process construction method of underground construction continuous impervious wall and the new material of application.Solved that cement is difficult for solidifying in the prior art, the intersegmental connection of wall is unreliable and run into the technical problem that needs sealing, leak stopping and retaining wall in complexity boring.The present invention adopts pressurization input method in the plastic clay post hole, single hole Cheng Zhu, and a chain of boring, input clay column become wall, and selecting for use based on the clay mineral that contains montmorillonite is base-material, builds subterranean continuous imperviousing wall.The technical finesse that goes wrong in antiseepage of contaminated solution source and reservoir seepage-proofing and the complicated boring.Mechanical pressure that pressurization is thrown in the wellhole and hydraulic coupling adopt following formula calculating to determine:

Description

Seepage-proof wall building method using underground pure clay and material

The present invention relates to a kind of at the construction technique of underground construction pure clay continuous impervious wall and the material of application.

Prior art is to adopt casing perfusion and segmentation fluting connection method to build underground reinforced concrete continuous impervious wall.The concrete cement mortar of flow regime is poured into borehole bottom from tube, easily cause cement mortar to mix with flushing liquor (mud), make cement be difficult for solidifying, the intersegmental connection of wall is unreliable; In the geological prospecting borehole construction, run in the time of to carry out the technical problem of sealing, leak stopping and retaining wall, adopt full hole cement injection mortar and chemical grout at present usually, carry out open-work after waiting to condense again, or manually manufacture clay ball and drop in the wellhole, carry out tamping again, the numerous rope of operation, difficulty of construction is big, be difficult for grasping, and it is many to take equipment, and the scope of operation is big, long construction period, the expense height also exists cement paste and chemical grout to be difficult for solidifying and clay ball is thrown less than problems such as borehole bottom.

The objective of the invention is in order to solve the problems referred to above, the shortcoming that existing current techique exists.Adopt following new construction technique and use new material, it is simple and convenient construct, and short construction period, material are easily purchased and just, build guality height, the underground pure clay continuous impervious wall that the life-span is grown.

The present invention realizes like this, adopt pressurization input method in the wellhole, to contain montmorillonite and be main clay material adds water and gives and make clay column, render at the bottom of the wellhole, the distortion of pressurized generation plastic radial, natural clay is full of in wellhole and the crack,, throws in and form underground pure clay diaphragm wall by certain program boring.

Make with montmorillonite (AI ₂(SI ₄O ₁₀) (OH) ₂, nH ₂O) content is greater than 60% natural clay mineral, after adding suitable quantity of water and stacking, will " " the big mouth of the pre-tubbing (see figure 1) of shape is docked at (see figure 2) in the outlet of mud extruder, will add clay that water-water reactor puts and add in the mud extruder and extrude, and be crowded with this " " the shape bucket; be made into a barrel interior clay column; the liquidity index that makes this clay column is 1, allowable bearing is at 70～100Kpa, and 1 among Fig. 1 is staving; roll with thick 6mm steel plate and form; the burn-on steel plate garden disk ring 2 of stack pile of an end seals, the burn-on drilling rod latching connector 3 of Φ 89mm of centre, and 1 among Fig. 2 is mud extruder; 2 is clay, 3 be "

" shape gives tubbing.

Be equipped with clay column "

" shape gives tubbing and hang in the wellhole, connects drilling rod, (see figure 3) at the bottom of the wellhole down, 1 be boring tower among Fig. 3, and 2 be kelly water under high pressure halter, joins with water pump or slush pump, and 3 is the wire rope that pressurizes, and 4 is drilling rod, 5 be " " shape gives tubbing, 6 is a barrel interior clay column, 7 clay walls for having caused in the stratum, 8 be natural stratum, 9 for pressurization with paying a hoist engine, utilize a pair hoist engine to pressurize to drilling rod by wire rope, be called mechanical pressure (↓), make "

" shape gives that tubbing is tight-lipped to be touched at the bottom of the wellhole tightly, opens pumps water, circulating fluid pressure by be delivered in the drilling rod "

" clay column top in the shape bucket, is called hydraulic coupling (↓) and promotes clay column is powerful downwards, but the effect of mechanical pressure is not allow clay column release, promptly " " interior mechanical pressure of bucket and hydraulic coupling while adverse effect, clay column is released by force in the bucket when hydraulic coupling increases to a certain degree, and produces the warp-wise distortion, makes the clay column overstriking be full of wellhole or crack, and the interior clay column of bucket is released (↓) downwards, "

" the shape bucket moves upward (↑); that is pushed out at clay column is constantly; circulation fluid is discharged from outside the hole in the wellhole; this process is continuous; the circulation fluid tap also is outward continuous; so can not seal mud up for safekeeping in clay, in the hole, realize building the purpose of clay wall and sealing, leak stopping, retaining wall.

The size of its mechanical pressure and hydraulic coupling adopts concrete calculating of following formula to determine:

T＞1.53×10 ^-2πr ²〔R〕 $\mathrm{P\; ＞}\frac{\mathrm{98T}}{{\mathrm{\pi \; r}}^2\mathrm{-2\pi r\; ·\; h\; ·\; u\; ·\; tg\phi }}$

See Fig. 4 when carrying out sealing, leak stopping, retaining wall with aforesaid operations, its operate is with above-mentioned consistent, and 1 is wellhole, and 2 is natural stratum, 3 be "

" shape gives tubbing, 4 is a barrel interior clay column, and 5 is the crack in the natural stratum, and 6 is by the crack of clay shutoff, reaches the purpose of sealing, leak stopping, retaining wall.

When building underground pure clay diaphragm wall with above-mentioned method of operating, should at first make the body of wall axis, make the wellhole position along the line,, adopt conventional drilling process by the dress rig, break into wellhole, adopt above-mentioned two processes to carry out single hole Cheng Zhu, bore with a chain of boring and dig～" single hole advances three and moves back one " construction sequence (see figure 5), cause underground pure clay diaphragm wall, the clay wall of right side 7 for having caused among Fig. 3, left side 8 is a natural stratum.

Effect of the present invention is that employing pure natural clay mineral is a material, underground pure clay diaphragm wall with pressurization input method construction in the wellhole, because of carrying out continuously that pressurization is thrown in, circulation fluid (mud) can be discharged outside the wellhole continuously, mud can not mix with pure clay, throw in reliable, mechanized degree height, can share out the work and help one another, increase work efficiency more than four times, material is cheap, cost is low, and one-tenth wall quality is good, the body of wall continuity is good, plasticity is good, barrier properties is strong, antiseismic, resistance to deformation, weather resistance, anticorrosive, the clay wall life-span is long.When being used for the processing of geological prospecting complexity drilling technique (comprising sealing, leak stopping, retaining wall), simple and easy to do than prior art, short construction period, technical finesse is reliable for effect.

The pre-tubbing schematic diagram of Fig. 1

Fig. 2 mud extruder and pre-tubbing connection diagram

Fig. 3 wellhole underclay post pressurization input method becomes the wall schematic diagram

Fig. 4 sealing, leak stopping, retaining wall effect schematic diagram

Fig. 5 construction sequence schematic diagram

Embodiment

The present invention administers engineering in the antiseepage of San-Shan-Dao Gold Mine mine tailing storehouse, Shandong Province and be applied in August, 92, adopt above-mentioned process and material success construction long 180 meters, dark 6.5～8 meters, thick 0.3～0.5 meter underground pure clay diaphragm wall, through multimedia check, the body of wall technical data of being built is: 1. the anti-side direction hydrostatic pressure of body of wall difference is 250Kpa, and 2. strength of wall body is allowable bearing 70～100Kpa, and 3. wall permeability coefficient is 2 * 10 ^-7～4 * 10 ^-7Cm/S, 4. body of wall is a plastic state, liquidity index is 1.And consistently think that this engineering design is reasonable through checking and accepting, construction technology is reliable, the body of wall continuous whole is good, barrier properties is good, plasticity is good, antidetonation, weather resistance, corrosion resistance are good, permanent good, cost is low, can obtain wide popularization and application in polluting antiseepage improvement engineering, the antiseepage that can be used for modern New-type refuse vehicle field is handled, and can be used under the reservoir dam, the groundwater reservoir antiseepage handles.

Claims (4)

1, a kind of construction method of underground pure clay impervious wall, it is characterized in that with fill the plastic clay post "

" shape gives tubbing and hangs in the wellhole; adopt pressurization input method (promptly under the acting in conjunction of rig mechanical pressure and hydraulic coupling); the powerful plastic clay post of releasing; make it to produce the warp-wise distortion; be full of wellhole and crack, make body of wall axis and position, hole, adopt conventional drilling process to break into wellhole; single hole Cheng Zhu, bore by the chain of rings dig～" single hole advances three and moves back one " program builds underground purity clay diaphragm wall.

2, according to the described plastic clay post of claim 1, it is characterized in that selecting for use smectite content is base-material greater than 60% natural clay mineral, add suitable quantity of water and extrude with mud extruder, and be crowded with "

" shape gives tubbing, a clay column liquidity index is 1 in the bucket.

3,, it is characterized in that the mechanical pressure of rig and hydraulic coupling are definite with following two formula calculating: T＞1.53 * 10 according to pressurization input method in the described wellhole of claim 1 ^-2π r ²(R)

$\mathrm{P\; ＞}\frac{\mathrm{98T}}{{\mathrm{\pi \; r}}^2\mathrm{-2\pi r\; ·\; h\; ·\; u\; ·\; tg\phi }}$

Also can be used for the complicated drilling technique of geological prospecting and handle, comprise sealing, leak stopping, retaining wall.

4, according to the described underground pure clay diaphragm wall of claim 1, it is characterized in that the continuous body of wall parameter of underground pure clay that adopts claim 2,3 methods to build is: 1. the anti-side direction hydrostatic pressure of body of wall difference is 250Kpa, 2. strength of wall body is allowable bearing 70-100Kpa, and 3. wall permeability coefficient is 2 * 10 ^-7～4 * 10 ^-7Cm/S, 4. body of wall is a plastic state, liquidity index is 1.

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