CN1025923C - Combination of explosion with strong tamping for compacting saturated open sand stratum - Google Patents
Combination of explosion with strong tamping for compacting saturated open sand stratum Download PDFInfo
- Publication number
- CN1025923C CN1025923C CN 92100099 CN92100099A CN1025923C CN 1025923 C CN1025923 C CN 1025923C CN 92100099 CN92100099 CN 92100099 CN 92100099 A CN92100099 A CN 92100099A CN 1025923 C CN1025923 C CN 1025923C
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- China
- Prior art keywords
- sand
- cartridge bag
- closely knit
- meters
- rammer
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- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The present invention relates to a method for compact saturation loose sand. An explosion technique and a heavy tamping technique are effectively combined; firstly, a lower layer of sand foundation is compacted through explosive vibration with gunpowder quantity and compaction action; an upper layer of the sand foundation is compacted by the heavy tamping action and the joint power compaction action of both; and therefore, a saturated loose sand foundation is compact within the range of full depth to perform actions of enhancing the bearing capacity of the foundation and reducing foundation settlement quantity. Compaction quality is superior to that of a vibroflotation method, and 50 % cost is lowered.
Description
The invention belongs to the civil engineering groundwork processing method, mainly be used for waterborne or saturated loose sand under water closely knit.
What mainly adopt in the engineering of handling the saturated loose sand ground at present is vibroflotation method.This method be by vibrating impacter generation level to vibration force, shake and squeeze sand body and reach the raising bearing capacity of foundation soil, reduce settling amount.The problem that this method exists is closely knit second-rate to the layer of sand bottom, difficulty of construction is big, needs vibrating impacter, stepped type boom hoisting, pumps water system during simultaneously owing to this method of enforcement, equipment such as motor that power is 50～75 kilowatts and control system are so construction cost is higher.
The densification process (SU850801 certificate of invention) of another kind of spongiosa soil is: blast with linear charges is imbedded in punching in spongiosa soil, form the blast cavity behind the explosive initiation, again with in the sand injection cavity and be full of cavity, then beat shallow eye and charging explosion, make its cavity charges closely knit on the cavity top that is full of sand.The quick-fried back of this densification process soil sample unit weight can reach 1.68～2.19 gram per centimeters
3, improve 9% before average volume to weight ratio is handled.This method requires to carry out twice punching on same position, twice charging explosion and injection sand in the cavity of quick-fried back once, and in order to form effective cavity, its dosage is very big, and the while does not clearly provide dosage yet and concerns in the invention of having announced.
The object of the present invention is to provide and a kind ofly make saturated loose sandy ground base in full depth bounds, all can bring up to medium dense state, its operation is simple, can reach simultaneously and improve bearing capacity of foundation soil and reduce settlement of foundation, a kind of new job practices of close sand base designing requirement in satisfying fully.
Be to realize the invention described above purpose, the method for closely knit saturated loose sand ground of the present invention comprises, ground through explode closely knit after, tamp at the sand primary surface with strong the rammer again.
Fig. 1 is combination of explosion with strong tamping encryption principle figure.
Fig. 2 is 5 meters＜H of sand base thickness
0Single cartridge bag cloth medicine figure of＜8 meters.
Fig. 3 is 8 meters≤H of sand base thickness
0＜15 meters double-deck cartridge bag cloth medicine figure.
Now by reference to the accompanying drawings principle of the present invention is introduced in detail, check sand base is closely knit fair with standard blow number N method, the undressed natural or common N=3 of artificial sand base～10 are hit, and the examination requirements of close sand base (N＞15 are hit) is 5 to thickness in can not satisfying The sand base of rice, in 5 meters, assay is shown in curve among Fig. 1 (2) with closely knit its effective (N＞15 are hit) compacting depth of heavy-tamping method. Below 6 meters, assay is shown in Fig. 1 curve (1) with closely knit its effective (N＞15 are hit) compacting depth of explosion method.
The present invention adopts and holes in the closely knit sand base of need earlier, in the hole, place the little dose blasting charge, utilize explosion vibration and compaction effect to make the sand base of the degree of depth below 6 meters obtain effectively closely knit (N＞15 are hit), adopt then strong rammer to make 5 meters of the degree of depth obtain effectively closely knit (N＞15 are hit) with interior sand base; The layer of sand that the degree of depth is 4 meters～7 meters is because the double action of blast and strong rammer also obtains effectively closely knit (N＞15 are hit). So just make the sand base in the full degree of depth is I, II, III district among Fig. 1, reach in close (N＞15 are hit) requirement.
The present invention can adopt two kinds of cloth prescription formulas of embedding single cartridge bag or two cartridge bags in force, when the thickness of sand base is 5 meters＜H
0In the time of＜8 meters, can select single cartridge bag cloth prescription formula for use.Its cloth medicine figure as shown in Figure 2.Hole (4) with cartridge bag V at the sand base earlier
1Imbed cartridge bag V
1Buried depth H
1With sand groundwork thickness H
0The pass be H
1=(0.5～0.7) H
0(rice).Single cartridge bag V
1Dose Q
1With its buried depth H
1The pass be Q
1=(0.03～0.08) H
3 1(kilogram).Distance between the adjacent powder charge hole (4)
Thick at layer of sand is 8 meters≤H
0In the time of＜15 meters, adopt double-deck cartridge bag cloth prescription formula as shown in Figure 3, upper strata cartridge bag V
2To the distance H between the sand primary surface (5)
1With the cartridge bag V of lower floor
3Distance H to required encryption sand base substrate (3)
2Substantially equal, with sand base thickness H
0Between the pass be H
1≈ H
2≈ (0.35～0.45) H
0, and (H
1+ H
2)＞0.75H
0, upper and lower layer cartridge bag V
2, V
3Between distance H
3Should satisfy following relational expression H
3＜(H
1+ H
2)/3.Upper strata cartridge bag V
2Dose Q
2With its buried depth H
1The pass be: Q
2=(0.03～0.08) H
3 1(kilogram), the cartridge bag V of lower floor
3Dose Q
3With its distance H to sand base substrate (3)
2The pass be: Q
3=(0.08～0.16) H
3 2(kilogram), the distance between the adjacent powder charge hole (4)
(rice).No matter adopt individual layer cartridge bag cloth medicine or double-deck cartridge bag cloth prescription formula, all adopt hole-by-hole initiation by row, adjacent two hole burst periods were separated by more than 20 minutes.After the end of constructing is encrypted in blast, adopt strong the rammer to carry out the encryption of secondary dynamic load, ram by force to encrypt and carry out in two steps.Carry out a rammer earlier, adopt full the rammer that the sand base is encrypted then.When point rams, single-point is rammed energy (300～400) T-m, grid spacing (3-5) rice, divide twice rammer, be no less than (2～4) sky twice blanking time, and the single-click number is no less than (10～15) and hits, point rams and finishes to carry out full rammer behind (3～5) sky, full ram energy (150～250) T-m, completely ram the single-click number and be no less than (2～3) and hit, adjacent two hammer into shape suitably overlapping.Sign (6) is a waterline among Fig. 2, Fig. 3.
After adopting the present invention that the saturated sand base is encrypted, with the check of standard blow number method, the sand base is in full depth bounds, and the average N value is hit greater than 25, the designing requirement of close sand base in satisfying fully.Simultaneously, adopt the present invention to compare and to reduce cost 50% with existing vibrocompaction.
One embodiment of the present of invention are as follows, and institute's works area sand base thickness is 12～15m, adopts layer cloth prescription formula shown in Figure 3, powder charge pitch of holes a
2 Be 5m, 2 of single hole cartridge bags, upper strata cartridge bag V
2Distance H to layer of sand surface (5)
1Be 4.5 meters, upper strata cartridge bag V
2With the cartridge bag V of lower floor
3Between distance H
3=3～3.5m, the cartridge bag V of lower floor
3Dose Q
3=10kg adopts hole-by-hole initiation by row, adopts strong the rammer to encrypt after the explosive treatment, the heavy 19.6T of hammer, and hammer footpath 2.2m, point rams and hangs high 18.6m.Single-point tamping point energy 365T-m, point rams spacing 4 * 4m, divides twice rammer, twice three days at interval.The first pass single-point is rammed 15 times, and second time single-point is rammed 12 times.The full rammer hung high 10.2m, and single-point is rammed energy 200T-m, the overlapping 1/4 hammer footpath of adjacent two hammers, several 3 times of single-click.
Claims (6)
1, a kind of method of closely knit saturated loose sand ground, its step comprise that earlier little cartridge bag is imbedded in boring in the sand base, it is characterized in that little cartridge bag is ignited by certain hole preface by row by the hole, ground through explode closely knit after, tamp at the sand primary surface with strong the rammer again.
2, the method for closely knit saturated loose sand ground according to claim 1 is characterized in that the thick H of sand basic unit that encrypts when needing
0Be 5 meters＜H
0In the time of＜8 meters, embedding single cartridge bag V in the sand base
1; Cartridge bag V
1Buried depth H
1With sand layer thickness H
0The pass be:
H
1=(0.5～0.7) H
0(rice);
Single cartridge bag V
1Dose Q
1With its buried depth H
1The pass be:
Q
1=(0.03～0.08) H
3 1(kilogram)
Between the adjacent powder charge hole (4) apart from a
1With single cartridge bag dose Q
1The pass be:
a
1＝（2～3）
<math><ROOT>3<OF><msub><mi>Q</mi><mi> 1</mi></msub></ROOT></math> (rice).
3, the method for closely knit saturated loose sand ground according to claim 1 is characterized in that as the thick H of layer of sand
0Be 8 meters≤H
0In the time of＜15 meters, adopt double-deck cartridge bag; Upper strata cartridge bag V
2Distance H to sand primary surface (5)
1With the cartridge bag V of lower floor
3Distance H to sand substrate (3)
2With sand layer thickness H
0Between the pass be: H
1≈ H
2=(0.35～0.45) H
0, and (H
1+ H
2)＞0.75H
0, upper strata cartridge bag V
2With the cartridge bag V of lower floor
3Between distance H
3Should satisfy following relational expression: H
3＜(H
1+ H
2)/3, upper strata cartridge bag V
2Dose Q
2With its buried depth H
1The pass be:
Q
2=(0.03～0.08) H
3 1(kilogram)
The cartridge bag V of lower floor
3Dose Q
3And it is to the distance H between the sand base substrate (3)
2The pass be:
Q
3=(0.08～0.16) H
3 2(kilogram)
Between the adjacent powder charge hole (4) apart from a
2For:
a
2=(2～3)
(rice).
4, the method for closely knit saturated loose sand ground according to claim 1 is characterized in that carrying out earlier a rammer, adopts full the rammer that the sand base is encrypted then.
5, according to the method for claim 1 and 4 described closely knit saturated loose sand grounds, to ram energy be 300～400T-m to single-point when it is characterized in that ramming, and grid spacing is 3～5 meters, divides twice rammer, be no less than 2～4 days at interval twice, the single-click number is no less than 10～15 and hits.
6, according to the method for claim 1 and 4 described closely knit saturated loose sand grounds, it is characterized in that it is 150～250T-m that full rammer is rammed energy, the single-click number is no less than 2～3 and hits, and adjacent two hammers are suitably overlapping.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92100099 CN1025923C (en) | 1992-01-17 | 1992-01-17 | Combination of explosion with strong tamping for compacting saturated open sand stratum |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 92100099 CN1025923C (en) | 1992-01-17 | 1992-01-17 | Combination of explosion with strong tamping for compacting saturated open sand stratum |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1065503A CN1065503A (en) | 1992-10-21 |
| CN1025923C true CN1025923C (en) | 1994-09-14 |
Family
ID=4938367
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 92100099 Expired - Fee Related CN1025923C (en) | 1992-01-17 | 1992-01-17 | Combination of explosion with strong tamping for compacting saturated open sand stratum |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1025923C (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100350103C (en) * | 2003-01-23 | 2007-11-21 | 上海国际港务（集团）股份有限公司 | Filling free vibroflotation method |
| CN100374655C (en) * | 2005-11-17 | 2008-03-12 | 中国矿业大学 | Synchronous blast-enlarging treatment method for liquified soil foundation of highway |
| CN100532729C (en) * | 2007-06-28 | 2009-08-26 | 刘汉龙 | High vacuum well-points dewatering groundwork treatment method by shallow ramming compaction and deep blasting compaction |
| CN108360499B (en) * | 2018-02-11 | 2020-10-02 | 北京中科力爆炸技术工程有限公司 | Large-area blasting compaction treatment method for runway foundation |
| CN111910614A (en) * | 2020-08-14 | 2020-11-10 | 大连万鹏基础工程有限公司 | Blasting compaction combined dynamic compaction foundation treatment method |
-
1992
- 1992-01-17 CN CN 92100099 patent/CN1025923C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1065503A (en) | 1992-10-21 |
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| Date | Code | Title | Description |
|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C15 | Extension of patent right duration from 15 to 20 years for appl. with date before 31.12.1992 and still valid on 11.12.2001 (patent law change 1993) | ||
| OR01 | Other related matters | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |