CN102253178B

CN102253178B - Test method of soil body dynamic consolidation model

Info

Publication number: CN102253178B
Application number: CN201110100459.5A
Authority: CN
Inventors: 李志清; 胡瑞林
Original assignee: Institute of Geology and Geophysics of CAS
Current assignee: Institute of Geology and Geophysics of CAS
Priority date: 2008-09-25
Filing date: 2008-09-25
Publication date: 2014-11-12
Anticipated expiration: 2028-09-25
Also published as: CN102253178A

Abstract

The invention discloses a test method of a soil body dynamic consolidation model. A test device is adopted in the test method. The test device comprises a tamping box, a tamping rack and a heavy hammer. The test method by utilizing the device comprises the following steps: (1) folding a side plate 1, a rear plate 2 and an organic glass plate 3 together; (2) laying premixed soil with a certain amount of water content and mass into the tamping box in layers; (3) tamping in a half model or in a complete model mode by beating the heavy hammer at one side or the middle part of the tamping rack; and (4) measuring change characteristics of the soil and water pressures as well as soil and water characteristic curves in the soil body tamping process. The test method provided by the invention has the following advantages: the tamping box, the tamping rack and the heavy hammer are designed according to the similarity coefficients required in the actual engineering; the change characteristics of the soil and water pressures as well as the soil and water characteristic curves in the site construction work can reappear by embedding a minitype soil pressure gage, a pore water pressure gauge, a water-containing probe and a suction probe in advance; and the indicators, such as consolidation coefficients and tamping degree of the tamping soil are measured.

Description

A kind of test method of soil body dynamic consolidation model

Technical field

The present invention is a kind of geotechnological experimental technique, belongs to technical field of civil engineering.

Background technology

China is used hits the real soil processing highway subgrade history of existing decades.As everyone knows, this method can improve subgrade rating and modulus in compression, and the method has the advantages such as easy construction, remarkable in economical benefits, obtains applying more and more widely.Yet the method does not also have theory and the design system of a set of maturation, be more to rely on Experience Design.Field construction complicated condition, develops an indoor soil tamp device to reproduce site operation situation, most important for physical mechanics mechanism and pore water pressure variation characteristic after research soil tamp.At present, domestic only be the compaction test apparatus of research soil body maximum dry density, the test unit and the test method thereof that also do not have a research soil body scene to hit true property.

Summary of the invention

The object of the present invention is to provide a kind of soil body dynamic consolidation test method, solve modulus in compression and mechanics index of physics test after soil tamp.

Technical solution of the present invention, it is characterized in that the method adopts a kind of soil body dynamic consolidation model test apparatus, this device is by hitting real case, hitting real frame and weight forms, hit real case and surround a cube by three iron plates and a poly (methyl methacrylate) plate, base plate be one with the iron plate of drainage groove, it is skewed that groove is, one of them angle point has weep hole, for groove draining, base plate and the surrounding of casing are provided with O-ring seal, together with three iron plates connect with hinge with base plate, poly (methyl methacrylate) plate and base plate riveted joint are sealed, the film with coordinate grid is posted on poly (methyl methacrylate) plate surface, be used for reading and hit real settling data, hit real frame and be placed on and hit above real case, and fixedly hit real case position with fixed pin, hit on real frame pulley is installed, for suspending weight in midair, hit on real frame ruler is installed, for measuring weight height, weight is rectangular parallelepiped derby, for the hammering soil body.

Test method is: (1) packs the soil body layering of certain water cut, quality to hit real case into, miniature earth pressure gauge, pore pressure gauge, water cut probe, suction probe are put into soil layer by testing requirement, suitably densification, can sense data from poly (methyl methacrylate) plate film scale, calculate compactness; (2) will hit real case and advance and hit real frame below, and hit on real frame weight by one group of suspended and the soil body is carried out to half module hit real or carry out full mould and hit reality by hitting weight that real frame intermediate pulley hangs; (3) weight suspension height is read by ruler, and the hammering soil body after weight drop produces displacement sedimentation and read by the film with coordinate grid; (4) hit in real process, soil body soil pressure, water pressure, water cut and suction change by probe to be read by readout instrument, to study physical mechanics mechanism and the pore water pressure variation characteristic that hits real soil; (5) moisture of the soil body in hitting real consolidation process is discharged by the weep hole of corner point by base plate drainage groove; (6) according to hitting real case volume markings, soil body quality, the indexs such as water cut can be calculated the mechanics index of physics such as compressibility coefficient after soil tamp and compactness.

Advantage of the present invention: real case is hit in the similarity coefficient design requiring according to Practical Project, hit real frame and weight, by pre-buried miniature earth pressure gauge, pore pressure gauge, water cut probe and suction probe, can reproduce soil water pressure and native water characteristic curve variation characteristic in site operation engineering, the indexs such as the real native coefficient of consolidation and compactness are hit in measurement, physical mechanics mechanism and pore water pressure variation characteristic after research soil tamp, and the method is simple, easily row, workable.

The present invention is suitable for the fields such as highway embankment, underground works.

Accompanying drawing explanation

Fig. 1 is the stereographic map that actual load is put that hits of the method use.In figure: 1 side plate, 2 rear plates, 3 connection hinges, 4 base plates, 5 castors, 6 poly (methyl methacrylate) plates, 7 blocks.

Fig. 2 is the front view that hits actual load bottom set plate 4.In figure: 8 rhones, 9 caulking grooves, 10 weep holes.

Fig. 3 is the A-A cut-open view of base plate front view.In figure: 8 rhones, vergence direction from top to bottom.

Fig. 4 is base plate front view B-B cut-open view.In figure: 8 rhones, vergence direction is from right and left.

Fig. 5 hits real frame front view.In figure: 11 pulleys.

Fig. 6 hits real frame C-C cut-open view.In figure: 11 pulleys, can be positioned at a side or centre, 12 fixed pins.

Embodiment

Embodiment: (1) by side plate 1, rear plate 2, poly (methyl methacrylate) plate 3 is close together, and embedding sealing becomes casing mutually, and whole casing embeds in base plate caulking groove 9, and with hinge 3 connections; (2) permeable stone is placed on base plate, the native place Min layers for preparing in advance certain water cut and quality is entered to hit real case, at diverse location, bury miniature earth pressure gauge underground, pore pressure gauge, water cut probe, suction probe, and apply certain pressure and meet the requirements of initial compactness, compactness is controlled by poly (methyl methacrylate) plate film scale reading; (3) will hit real frame is placed on and hits above real case, by fixed pin 12, fixedly hit real case, cube weight hangs by pulley 11, height is controlled by hitting ruler fixing on real frame, by hitting real frame one side or centre, fall that weight carries out half module or full mould hits reality, excessive moisture drains into weep hole 10 by base plate 4 inclination rhones 8; (4) by watching poly (methyl methacrylate) plate gluing sheet scale, control the soil body sedimentation degree of depth, to control the compactness after soil tamp, and read pre-buried earth pressure gauge, WG, the measurement data of water cut probe and suction probe, measures soil water pressure and native water characteristic curve variation characteristic in soil tamp process, to study physical mechanics mechanism and the pore water pressure variation characteristic that hits real soil.

Claims

1. a test method of soil body dynamic consolidation model, it is characterized in that the method adopts a kind of test unit, this device is by hitting real case, hitting real frame and weight forms, hit real case by two blocks of side plates (1), plate after one (2) and a poly (methyl methacrylate) plate (6) surround a cube case, base plate (4) be one with the iron plate of rhone (8), it is skewed that groove is, the angle point of the lowest point of groove vergence direction has weep hole (10), cube case passes through caulking groove (9) build-in on base plate, base plate and surrounding are provided with O-ring seal, side plate (1), rear plate (2) links together with hinge (3) with base plate (4), poly (methyl methacrylate) plate (6) is sealed with base plate (4) riveted joint, the film with coordinate grid is posted on poly (methyl methacrylate) plate (6) surface, hitting real frame is placed on and hits above real case, and fixedly hit real case position with being positioned at the fixed pin (12) hitting in the middle of real frame lower beam, hit pulley (11) is installed on real frame, side is provided with ruler, weight is rectangular parallelepiped derby, with this device, carry out test method of soil body dynamic consolidation model as follows:

1. by side plate (1), rear plate (2), poly (methyl methacrylate) plate (6) is close together, and embedding sealing becomes casing mutually, and whole casing embeds in base plate caulking groove (9), and connects with hinge (3);

2. permeable stone is placed on base plate, the native place Min layers for preparing in advance certain water cut and quality is entered to hit real case, at diverse location, bury miniature earth pressure gauge underground, pore pressure gauge, water cut probe, suction probe, and apply certain pressure and meet the requirements of initial compactness, compactness is controlled by the film scale reading on poly (methyl methacrylate) plate (6);

3. will hit real frame is placed on and hits above real case, by fixed pin (12), fixedly hit real case, rectangular parallelepiped weight hangs by pulley (11), height is controlled by hitting ruler fixing on real frame, by hitting real frame one side or centre, fall that weight carries out half module or full mould hits reality, hit the moisture producing after real and drain into weep hole (10) by base plate (4) inclination rhone (8);

4. by watching the film scale on poly (methyl methacrylate) plate (6), control the soil body sedimentation degree of depth, to control the compactness after soil tamp, and read pre-buried earth pressure gauge, WG, the measurement data of water cut probe and suction probe, measures soil water pressure and native water characteristic curve variation characteristic in soil tamp process, to study physical mechanics mechanism and the pore water pressure variation characteristic that hits real soil.