CN1731141A - On-site testing device for pore space ratio of deep level saturated sand soil - Google Patents

Abstract

The invention discloses a deep layer zero air void ratio sampling apparatus. It comprises: inserting a probe into the sampling deep layer earth, inserting the other non-corrodible steel probes with long equation in parallel arrangement into the earth, fixing the top of the non-corrodible steel probe on the epoxide resin and connecting it with coaxial cable. The screwed steel pipe on the top of the probe and the pipe are connected with the earth. The other end of the coaxial cable is connected with the electromagnetic wave exciter and the electromagnetic wave receiver which is connected with the data storage.

Description

On-site testing device for pore space ratio of deep level saturated sand soil

Technical field

The present invention relates to a kind of on-site testing device for pore space ratio of deep level saturated sand soil.

Background technology

At present, the common employing ground penetrating radar method of domestic on-the-spot test saturated sand void ratio, this method utilizes frequency electromagnetic waves to send into underground by the ground emitting antenna form of broadband short pulse, utilize terrestrial receiving antenna to receive reflected signal, determine void ratio by measuring the velocity of propagation of electromagnetic wave in soil layer.Because the emitting antenna of this method and receiving antenna all are placed on ground, soil has attenuation to determine that the propagation distance of electromagnetic wave in soil can not be oversize to electromagnetic wave, so there is the shallow shortcoming that fathoms in this method.The domestic method of still not having on-the-spot test deep level saturated sand soil pores ratio.

Summary of the invention

The purpose of this invention is to provide a kind of on-site testing device for pore space ratio of deep level saturated sand soil, can measure the saturated sand void ratio of any degree of depth.

The technical solution used in the present invention is as follows:

The saturated cohesiveless soil void ratio of deep layer on-site testing device, it comprises three isometric stainless steel probes that are arranged in parallel, its top all is fixed in the epoxy resin box and through concentric cable and is connected with electromagnetic wave receiver with ground electromagnetic wave excites device, and electromagnetic wave receiver is connected with data-carrier store; Wherein:

1) three isometric stainless steel tips of probes that are arranged in parallel all have aperture, with fixed screw weld tabs is fixed on the stainless steel tips of probes, inner conductor is welded on the weld tabs of the stainless steel tips of probes in the middle of being arranged in, and coaxial cable outer conductor is connected on the weld tabs of stainless steel tips of probes of both sides through lead respectively;

2) be equipped with on epoxy resin box top and preset steel pipe, concentric cable passes from steel pipe, there are two apertures both sides, steel pipe lower end, lead is drawn from the hole respectively and is connected with the weld tabs and the coaxial cable outer conductor of the stainless steel tips of probes that is arranged in both sides, and fills space between lead and the hole with flexible material; Preset end, steel pipe lower end in length and breadth two to welding location steel disc; Preset steel pipe upper end and fill concentric cable with flexible material and preset space between the steel pipe, and use epoxy sealing; Presetting steel pipe and stainless steel probe all is fixed in the epoxy resin box;

3) the connection steel pipe of both end thread through butt junction be preset in the epoxy resin box in preset steel pipe and be connected steel pipe and connect, spreading is to preseting length continuously; Concentric cable passes from connect steel pipe and butt junction.

The beneficial effect that the present invention has is: by adopting such scheme, saturated cohesiveless soil void ratio that can any degree of depth of in-site measurement, and have good crushing resistance, resistance to plucking and water proofing property has that principle is clear and definite, simple in structure, convenience operation.

Description of drawings

Fig. 1 is a structural principle synoptic diagram of the present invention;

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

Fig. 3 is concentric cable and probe junction coaxial electrical cable-end connection layout;

Fig. 4 is concentric cable and probe junction sound end connection layout;

Schematic diagram of device when Fig. 5 is on-the-spot test.

Among the figure: 1, concentric cable, 2, connect steel pipe, 3, butt junction, 4, preset steel pipe, 5, the epoxy resin box, 6, lead, 7, weld tabs, 8, fixed screw, 9, the stainless steel probe, 10, inner conductor, 11, coaxial cable outer conductor, 12, the concentric cable sheath, 13, concentric cable packing material, 14, in length and breadth two to welding location steel disc, and 15, flexible packing material, 16, epoxy resin, 17, electromagnetic wave excites device, receiver, 18, Completion of Drilling Hole.

Embodiment

As Fig. 1, Fig. 2, Fig. 3, Fig. 4, shown in Figure 5, the on-site testing device of deep level saturated sand soil pores ratio, it comprises three isometric stainless steel probes 9 that are arranged in parallel that can insert at the scene in the deep level saturated sand soil, and its top is fixed in the epoxy resin box 5 and through concentric cable 1 and is connected with data-carrier store with ground electromagnetic wave excites device, electromagnetic wave receiver 17; Preset threaded aluminum pipe 4 on epoxy resin box 5 tops, can be connected with long duct 2 through butt junction 3.

As shown in Figure 4, aperture is all reserved on three isometric stainless steel probe 9 tops that are arranged in parallel, with fixed screw 8 weld tabs 7 is fixed on stainless steel probe 9 tops, on the weld tabs 7 of the stainless steel tips of probes in the middle of inner conductor 10 is welded in and is arranged in, coaxial cable outer conductor 11 is connected on the weld tabs 7 of the stainless steel tips of probes that is arranged in both sides through lead 6.

As shown in Figure 1, preset on epoxy resin box 5 tops and to preset steel pipe 4, concentric cable 1 passes from steel pipe 4, preset both sides, steel pipe 4 lower end and reserve two apertures, lead 6 is drawn from the hole respectively and is connected with the weld tabs 7 and the coaxial cable outer conductor 11 on stainless steel probe 9 tops that are arranged in both sides, and fills space between leads 6 and the hole with flexible material 15; Preset steel pipe 4 upper ends and fill concentric cable 1 and the space of presetting between the steel pipe 4, and seal with epoxy resin 16 with flexible material 15; Steel pipe and stainless steel probe 9 all are fixed in the epoxy resin box 5.

As shown in Figure 1, the connection steel pipe 2 of both end thread through butt junction 3 be preset in the epoxy resin box in preset steel pipe 4 and be connected steel pipe 2 and connect, spreading is to Len req continuously; Concentric cable 1 passes from connect steel pipe 2 and butt junction 3.Connecting steel pipe 2 and butt junction 3 ends should be smooth as far as possible, in case concentric cable 1 wearing and tearing.

That as shown in Figure 2, presets end, steel pipe 4 lower end two can improve resistance to compression of this proving installation and extraction-resistant behavior to welding location steel disc 14 in length and breadth.

The water-proofing treatment of test probe system is to fill concentric cable 1 with flexible material 15 and preset space between the steel pipe 4 presetting steel pipe 4 upper ends, and with epoxy resin 16 sealing, sealant is wanted evenly, should not be too thick, must not there be bubble to exist, to guarantee waterproof and dampproof property, toughness and the ageing resistance of sealant.

As shown in Figure 5, adopt rig in soil Completion of Drilling Hole 18 to set depth, connection steel pipe 2 to the respective length that connects some is inserted in the saturated sand with assurance probe 9 fully, the test probe that connects is inserted, and concentric cable 1 upper end is connected with ground electromagnetic wave excites device, electromagnetic wave receiver 17.Reflected signal receives and stores into data-carrier store, the DIELECTRIC CONSTANT of being read this saturated sand by data through the electromagnetic wave receptacle _r, try to achieve the void ratio of this saturated sand again according to following formula.

$(2\underset{i}{\mathrm{\&Sigma;}}{A}_i-3){{\mathrm{\&epsiv;}}_{\mathrm{<figure-callout\; id="2"\; label="r"\; filenames="A20051006056800061.png,A20051006056800091.png"\; state="\{\{state\}\}">r</figure-callout>}}}^2+(\underset{i}{\mathrm{\&Sigma;}}{A}_i{\mathrm{\&epsiv;}}_{\mathrm{ri}}+4\underset{i}{\mathrm{\&Sigma;}}{A}_i+3){\mathrm{\&epsiv;}}_r+2\underset{i}{\mathrm{\&Sigma;}}{A}_i{\mathrm{\&epsiv;}}_{\mathrm{ri}}=0$

Wherein, variable $A_i=\frac{{\mathrm{\&epsiv;}}_{\mathrm{ri}}-1}{{\mathrm{\&epsiv;}}_{\mathrm{ri}}+2}{v}_i,$ ε _RiBe respectively the soil particle DIELECTRIC CONSTANT _sWith the free water DIELECTRIC CONSTANT _Fwv _iBe respectively soil particle volume content and porosity in the saturated sand.

Claims (1)

1. on-site testing device for pore space ratio of deep level saturated sand soil, it comprises three isometric stainless steel probes (9) that are arranged in parallel, its top all is fixed in the epoxy resin box (5) and through concentric cable (1) and is connected with electromagnetic wave receiver with ground electromagnetic wave excites device, and electromagnetic wave receiver is connected with data-carrier store; It is characterized in that:

1) all there is aperture on three isometric stainless steel probe (9) tops that are arranged in parallel, with fixed screw (8) weld tabs (7) is fixed on stainless steel probe (9) top, inner conductor (10) is welded on the weld tabs (7) on stainless steel probe (9) top in the middle of being arranged in, and coaxial cable outer conductor (11) is connected on the weld tabs (7) on stainless steel probe (9) top of both sides through lead (6) respectively;

2) be equipped with on epoxy resin box (5) top and preset steel pipe (4), concentric cable (1) passes from steel pipe (4), there are two apertures steel pipe (4) both sides, lower end, lead (6) is drawn from the hole respectively and is connected with the weld tabs (7) and the coaxial cable outer conductor (11) on stainless steel probe (9) top that is arranged in both sides, and fills space between lead (6) and the hole with flexible material (15); Preset steel pipe (4) end, lower end in length and breadth two to welding location steel disc (14); Preset steel pipe (4) upper end with flexible material (15) filling concentric cable (1) and preset space between the steel pipe (4), and seal with epoxy resin (16); Presetting steel pipe (4) and stainless steel probe (9) all is fixed in the epoxy resin box (5);

3) the connection steel pipe (2) of both end thread through butt junction (3) be preset in the epoxy resin box in preset steel pipe (4) and be connected steel pipe (2) and connect, spreading is to preseting length continuously; Concentric cable (1) passes from connect steel pipe (2) and butt junction (3).

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