CN103397625A - Test technology for filling original position of giant grained mixed soil - Google Patents

Abstract

The invention discloses a test technology for filling original position of giant grained mixed soil. The test technology is characterized in that a drop hammer is in the weight of 200 kg; a probe is a standard probe; the feeling and inspecting rod is a 50 mm drill rod. The test technology comprises the following steps: continuous feeling and inspecting for the soil layer to be tested is performed; the drop distance of the hammer during the test is 1 m, the hammer performs free falling, and the striking number of the hammer for each 10 cm in soil layer is recorded; if dense and hard soil layer causes the required striking number higher than 50, a drilling tool is used for drilling a hole thoroughly before the penetration is started again. The test technology has the advantages that the N200 power feeling and inspecting can penetrate rock and soil layer with large thickness, and the data can be used directly.

Description

A kind of soil mixtures with giant grains plain fill in-situ testing technique

Technical field

The present invention is that the probe that utilizes certain energy that drops hammer to be connected with sounding rod is squeezed in soil, is expressed as pile penetration or penetration resistance according to the complexity of squeezing into and judges a kind of home position testing method of the engineering properties of soil.

Background technology

At present both at home and abroad few to digging the banket soil mixtures with giant grains plain fill research that causes of mountain; because the physico-mechanical properties of soil mixtures with giant grains plain fill is very special; again because some soil mixtures with giant grains plain fill layer thickness is larger; 12 meters left and right; less running at home, its treatment technology are in the blank stage at home.Design parameters is because the particularity of soil mixtures with giant grains plain fill also is difficult to obtain.Detection means can not solve with conventional method, and to contain piece stone more due to soil mixtures with giant grains plain fill inside.Use load test method, detect the degree of depth and only have 2 meters left and right,, with superduty gravity feeler inspection, can not penetrate so thick piece stone fill stratum.

Summary of the invention

The purpose of this invention is to provide a kind of soil mixtures with giant grains plain fill in-situ testing technique, design a kind of soil mixtures with giant grains plain fill in-situ test instrument, the heavy 200kg of the hammer that drops hammer, pop one's head in as standard probe, and sounding rod is the 50mm drilling rod; The N200 dynamic sounding can penetrate thick piece stone fill stratum.

The object of the present invention is achieved like this:

A kind of soil mixtures with giant grains plain fill in-situ testing technique, design a kind of soil mixtures with giant grains plain fill in-situ test instrument, and the heavy 200kg of the hammer that drops hammer, pop one's head in as standard probe, and sounding rod is the 50mm drilling rod; Concrete operation step is as follows: required test soil layer is carried out feeler inspection continuously, the test hour hammer falls apart from for 1m, makes its free-falling, required hammering number when 10cm in soil layer often squeezed in record, hit when the required hammering number of injection surpasses 50 as closely knit hard soil layer, continue again injection after drawing hole clearly with drilling tool.

The inventive method has the following advantages:

At present both at home and abroad few to digging the banket soil mixtures with giant grains plain fill research that causes of mountain; to contain piece stone more due to soil mixtures with giant grains plain fill inside; because some soil mixtures with giant grains plain fill layer thickness is larger, 12 meters left and right, the conventionally test means can not penetrate so thick piece stone fill stratum again.The N200 dynamic sounding can penetrate so thick piece stone fill stratum, and data are directly available.

Description of drawings

Fig. 1 is the structure chart of soil mixtures with giant grains plain fill in-situ test instrument.

In figure: drop hammer 3-sounding rod 4-probe of 1-wire rope 2-

The specific embodiment

Dynamic sounding device in a kind of soil mixtures with giant grains plain fill in-situ testing technique comprises wire rope 1, drops hammer 2, sounding rod 3, feeler inspection probe 4 that the heavy 200kg of the described hammer that drops hammer, pop one's head in as standard probe, and sounding rod is the 50mm drilling rod; Wire rope 12 is connected with dropping hammer, and sounding rod 3 ends are connected with feeler inspection probe 4, drop hammer and sounding rod between be provided with the distance that falls of 1m.Concrete operation step is as follows: required test soil layer is carried out feeler inspection continuously, and the test hour hammer falls apart from for 1m, makes its free-falling, and required hammering number when 10cm in soil layer often squeezed in record, hit when the required hammering number of injection surpasses 50 as closely knit hard soil layer.

This steel enterprise of saddle situ Piles in Rock Filled Stratum in Bayuquan defrozing silo engineering strong rammer is processed artificial earth fill's dynamic sounding examining report

One, place overview

Defrozing silo is between Huaneng Group power plant and sintering plant.Ram head of district 228m, wide 38.4m.Be artificial smooth formation, more smooth, the earth's surface absolute altitude is between 16m-17m on-the-spotly, and backfill thickness is about between 10m-14m, and the backfill time was about about 2 years.The tamping energy of this strong rammer is 500tm, and the main purpose of strong rammer is to process loose fill, to reach designing requirement.

Owing to there is no complete geological mapping report before detection, we find in the dynamic sounding testing process, banket be substantially by middle decomposed granite matter migmatite rock blasting produce take bulk rubble (maximum rubble is about 2m) as main, contain a small amount of weathering rock dust and soil and wait the foreign material composition.

Two, checkout equipment and result

Heavy dynamic penetration N _63.5With superduty dynamic sounding N ₁₂₀All to estimate the checkout equipment that rubble bankets.From the situation in this place, the intensity of sillar is high, particle diameter is large, and particularly after large tamping energy was processed, the said equipment just can't detect banketing after processing.Construction quality inspection center is recognized from Dalian, in Dalian for many years, fill out on a large scale in extra large strong rammer detection, the dynamic sounding checkout equipment that standard often occurs can't pass through the problem of banketing, and for addressing this problem, they have used the jump bit on percussion drilling or soil sampler top for dropping hammer, its quality is at 200kg, fall apart from for 1m, there is no automatic decoupling device, elevator one direct sum of rig is dropped hammer connected.Can obtain like this backfill layer in compactness situation of change longitudinally, refer again to the dynamic loading experiment result, can be estimated the effect of strong rammer., because the hammer that uses is heavy and the distance that falls is all different, in order to find an evaluation index,, in order to these testing results can be compared, quote moving penetration resistance q here _d, the suffered resistance in penetration process of namely popping one's head in.Its design formulas is as follows

$q_d=-1.1+\sqrt{1.21+\mathrm{MgH}\frac{2.2(M+0.3M^{\′})}{\mathrm{Ae}(M+M^{\′})}}$

q _d: moving penetration resistance (MPa);

M: the quality of dropping hammer (kg);

M ': the quality (kg) of detector (comprising probe, sounding rod, hammer seat and guide peg);

H: height of the fall (m);

G: acceleration of gravity (m/s ²);

A: probe sectional area (cm ²);

E: penetration per blow (cm).

In practical application, we also will give to the use of this design formulas following explanation: the quality of 1, dropping hammer is owing to being to be connected with elevator, and the gravity of the mass formation of hammer 10～15% is to offset the loss of this part.2, the probe sectional area is 43 cm ²3, M ' changes with the long variation of bar, and general 3m-4m adds bar No. one time.

This detection quality 150kg that drops hammer, height of the fall H press 0.70m and calculate, and M ' changes between 50kg～110kg because of the increase of sounding rod.

0～3m： $q_d=-1.1+\sqrt{1.21+\frac{42.98}{e}}$

3m～7m： $q_d=-1.1+\sqrt{1.21+\frac{37.81}{e}}$

7m～9m： $q_d=-1.1+\sqrt{1.21+\frac{34.31}{e}}$

This dynamic sounding detects and has arranged altogether 6 test points, but because Equestrian-Jumping is too many, actually completes 3, numbering 1#, 5#, 6#.

Q after 1# rams _dValue

Q after 5# rams _dValue

Q after 6# rams _dValue

From above statistical computation result as seen, ram the rear thick q that bankets of upper strata 7m _dValue is 6.22 MPa～8.23 MPa.According to the local area experience, when tamping energy was 500tm, effectively affecting the degree of depth was 7m～8m left and right.Effectively affecting in the degree of depth, characteristic load bearing capacity is not less than 180kPa.There are two weak intercalated layers in the 5# hole at buried depth 0m～0.5m, 3.8m～4.5m, and characteristic load bearing capacity is in the 120kPa left and right.

Three, conclusion and suggestion

1, because Equestrian-Jumping is too many, Kong Weijun moves, and after repeatedly moving, has become three holes, and hole number is respectively 1#, 5#, 6#.So this detection can only provide the feeler inspection data of three points for design reference.

2, according to the local area experience, when tamping energy was 500tm, effectively affecting the degree of depth was 7m～8m left and right.At the q of the 7m degree of depth with interior rammer soil _dValue generally is not less than 6MPa, and characteristic load bearing capacity is not less than 180kPa.The effect of the strong rammer of banketing of 7m～8m is general, and characteristic load bearing capacity is not less than 120kPa.There are two weak intercalated layers in the 5# hole at buried depth 0m～0.5m, 3.8m～4.5m, and characteristic load bearing capacity is in the 120kPa left and right.

3, from place on the whole, the southeast, place side bulk rubble is more, and it is less that the northwest side contains the bulk rubble, and part contains weak intercalated layer.Banketing after strong rammer is heterogeneous.

Claims (1)

1. a soil mixtures with giant grains plain fill in-situ testing technique, is characterized in that, designs a kind of soil mixtures with giant grains plain fill in-situ test instrument, and the heavy 200kg of the hammer that drops hammer, pop one's head in as standard probe, and sounding rod is the 50mm drilling rod; Concrete operation step is as follows: required test soil layer is carried out feeler inspection continuously, the test hour hammer falls apart from for 1m, makes its free-falling, required hammering number when 10cm in soil layer often squeezed in record, hit when the required hammering number of injection surpasses 50 as closely knit hard soil layer, continue again injection after drawing hole clearly with drilling tool.

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