CN105823718A - Method for confirming water injection level of drilling hole and constant head water injection test - Google Patents
Method for confirming water injection level of drilling hole and constant head water injection test Download PDFInfo
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- CN105823718A CN105823718A CN201610220686.4A CN201610220686A CN105823718A CN 105823718 A CN105823718 A CN 105823718A CN 201610220686 A CN201610220686 A CN 201610220686A CN 105823718 A CN105823718 A CN 105823718A
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- test
- water injection
- test section
- constant head
- confirming
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 41
- 238000002347 injection Methods 0.000 title claims abstract description 30
- 239000007924 injection Substances 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000005553 drilling Methods 0.000 title abstract description 6
- 239000002689 soil Substances 0.000 claims abstract description 6
- 238000001764 infiltration Methods 0.000 claims description 14
- 230000008595 infiltration Effects 0.000 claims description 14
- 230000035699 permeability Effects 0.000 abstract description 5
- 238000011065 in-situ storage Methods 0.000 abstract description 2
- 239000003673 groundwater Substances 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000205 computational method Methods 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
Landscapes
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention relates to the field of in-situ permeability tests of a rock-soil body and provides a method for confirming the water injection level of a drilling hole and constant head water injection test. The method is convenient for on site operation and meets application conditions of a permeability computing formula. The method comprises the steps summarized as follows: a, confirming the radius of a test section according to the bit diameter; b, confirming the length of the test section according to the revealing situation of a drilling rock-soil layer; c, when the test section is above the underground water level, confirming the height difference between the water injection level and the top of the test section according to a computing formula of the test water head value of a constant head water injection test and an application condition expression of a permeability coefficient computing formula of the constant head water injection test; d, confirming the water injection level according to the height difference and the test section length. The method provided by the invention is suitable for confirming the water injection level of the drilling hole and constant head water injection test when the test section is above the underground water level.
Description
Technical field
The present invention relates to Rock And Soil permeability in-situ test field, particularly to the determination method of boring constant head water injection test fill level.
Background technology
At present, the existing code of drilling hole and injecting water experiment and associated specifications, the requirement of constant head water injection test fill level of holing time more than water level located underground to test section is: higher than level of ground water certain altitude or to cannula tip.Inside this requirement, the saying " higher than level of ground water " is wrong, should be " higher than test section top "；Inside this requirement, " certain altitude or to cannula tip " saying is indefinite, and current scene determines that fill level has real randomness, does not meets the applicable elements of infiltration coefficient computing formula when fill level is too high or too low, affects the accuracy of result of the test.Therefore it is necessary for studying a kind of method determining fill level.
Summary of the invention
The technical problem to be solved in the present invention is: provides a kind of determination method of constant head water injection test fill level of holing, it is simple to execute-in-place, meets the applicable elements of permeability computing formula, it is ensured that the reliability of test result.
For solving the problems referred to above, the technical solution used in the present invention is: the determination method of boring constant head water injection test fill level, comprises the steps:
A. according to bit diameter, determine that test section radius, test section radius are designated as r；
B. disclose situation according to boring rock-soil layer, determine that test section length, test section length are designated as L；
C. time more than test section water level located underground, the computing formula of the test head value according to constant head water injection test, and the applicable elements formula of the infiltration coefficient computing formula of constant head water injection test, determine that the difference in height of fill level and test section top, described difference in height are designated as Δ H；
D. fill level is determined according to described difference in height and described test section length.Difference in height Δ H is the fill level higher than test section top.
Specifically, the computing formula of the test head value of constant head water injection test described in step c is: H=Δ H+L/2, and wherein, H is test head value.
For further, the applicable elements formula of infiltration coefficient computing formula described in step c is: 50 ＜ H/r ＜ 200, H≤L.
The present invention is by calculating and analyze computing formula H=Δ H+L/2 and applicable elements formula 50 ＜ H/r ＜ 200, the H≤L of infiltration coefficient computing formula of constant head test head value, obtain suitable Δ H, finally determine the height of the fill level meeting requirement.
The invention has the beneficial effects as follows: on the basis of the computational methods that specify that test section radius, test section length, test head, the present invention is according to the applicable elements of infiltration coefficient computing formula, draw clear and definite, suitable fill level, push away owing to gained fill level is that the applicable elements according to infiltration coefficient computing formula is counter, therefore gained water filling condition disclosure satisfy that the applicable elements of infiltration coefficient computing formula, it is easy to execute-in-place, and advantageously ensures that the reliability of result of the test.
Accompanying drawing explanation
Fig. 1 is water injection test water level structure schematic diagram.
Figure is numbered: A fill level；B head zequin (i.e. test section midpoint)；C level of ground water；Δ H fill level and the test section top discrepancy in elevation；L tests segment length；H test head value；R test section radius.
Detailed description of the invention
In conjunction with the water injection test water level structure schematic diagram shown in Fig. 1, the present invention specifically comprises the following steps that
A. according to bit diameter, test section radius r is determined；
B. disclose situation according to boring rock-soil layer, determine test section length L；
C. during test section more than water level C located underground, the computing formula H=Δ H+L/2 of the test head value according to constant head water injection test, and the applicable elements formula of the infiltration coefficient computing formula of constant head water injection test, determine the difference in height Δ H of fill level and test section top；
D. determine that fill level A, difference in height Δ H are the fill level higher than test section top according to described difference in height and described test section length.Total height=the fill level of fill level and difference in height Δ H+ test section length L at test section top.
For ease of understanding, below by embodiment, the present invention is further described.
A diameter of 59mm～158mm of certain engineer geological prospecting drill, according to engineering experience, drilling hole and injecting water experiment is suitable > 91mm, i.e. 91mm≤test section diameter≤158mm, obtain 0.0455m≤test section radius r≤0.079m；According to engineering experience, test section length is preferably 3m～5m, i.e. 3m≤L≤5m.And, it is known that infiltration coefficient computing formulaApplicable elements be " 50 ＜ H/r ＜ 200, H≤L ", wherein K be infiltration coefficient, Q be injection flow, owing to pertaining only to the applicable elements formula of infiltration coefficient computing formula in the present invention, therefore infiltration coefficient computing formula and K, Q therein are not done too much explanation.
Certain water injection test:
First, based on above-mentioned scope, we determined that the test section radius r=0.07m of this time test, test section length L=5m；
Then, according to the computing formula H=Δ H+L/2 of known test head value, we derive Δ H=H-L/2 further；
Then, according to applicable elements " 50 ＜ H/r ＜ 200, H≤L ", and the formula Δ H=H-L/2 of above-mentioned derivation, carry out calculating, analyzing, draw suitable fill level, be specifically calculated as follows:
(1) L=5m, H≤L and Δ H=H-L/2 is drawn Δ H≤2.5 by mathematical calculation；
(2) by r=0.07m, L=5m, 50 ＜ H/r ＜ 200 and Δ H=H-L/2,1 ＜ Δ H ＜ 11.5 is drawn by mathematical calculation.
Comprehensively (1) (2), show that 1 ＜ Δ H≤2.5, i.e. fill level A are preferably higher than test section top 1～2.5m.
The foregoing describe the ultimate principle of embodiment and main feature; the principle describing the simply explanation present invention of description; without departing from the spirit and scope of the present invention, the present invention also has various changes and modifications, and these changes and improvements both fall within scope of the claimed invention.
Claims (3)
1. the determination method of constant head water injection test fill level of holing, it is characterised in that comprise the following steps:
A. according to bit diameter, determine that test section radius, test section radius are designated as r；
B. disclose situation according to boring rock-soil layer, determine that test section length, test section length are designated as L；
C. time more than test section water level located underground, the computing formula of the test head value according to constant head water injection test, and the applicable elements formula of the infiltration coefficient computing formula of constant head water injection test, determine that the difference in height of fill level and test section top, described difference in height are designated as Δ H；
D. fill level is determined according to described difference in height and described test section length.
The determination method of boring constant head water injection test fill level the most according to claim 1, it is characterised in that the computing formula of described constant head water injection test test head value is: H=Δ H+L/2, wherein, H is test head value.
The determination method of boring constant head water injection test fill level the most according to claim 2, it is characterised in that the applicable elements formula of described infiltration coefficient computing formula is: 50 ＜ H/r ＜ 200, H≤L.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610220686.4A CN105823718A (en) | 2016-04-11 | 2016-04-11 | Method for confirming water injection level of drilling hole and constant head water injection test |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610220686.4A CN105823718A (en) | 2016-04-11 | 2016-04-11 | Method for confirming water injection level of drilling hole and constant head water injection test |
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| CN105823718A true CN105823718A (en) | 2016-08-03 |
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| CN201610220686.4A Pending CN105823718A (en) | 2016-04-11 | 2016-04-11 | Method for confirming water injection level of drilling hole and constant head water injection test |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109958434A (en) * | 2017-12-25 | 2019-07-02 | 核工业北京地质研究院 | The constant-pressure unsteady flow that drills drilling Hydrogeological Test Method |
| CN113791013A (en) * | 2021-08-31 | 2021-12-14 | 长江岩土工程有限公司 | Continuous water injection test method for drilling holes in soil impervious body of dam of dangerous reservoir |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001132375A (en) * | 1999-10-29 | 2001-05-15 | Nishi Nippon Chishitsu Chiyousashiyo:Kk | Double tube type on-site permeability test method and device |
| CN101858074A (en) * | 2010-06-10 | 2010-10-13 | 上海市城市建设设计研究院 | Construction method and device for on-site water injection test |
| CN203373718U (en) * | 2013-06-09 | 2014-01-01 | 机械工业勘察设计研究院 | Double-ring water filling experiment device |
-
2016
- 2016-04-11 CN CN201610220686.4A patent/CN105823718A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001132375A (en) * | 1999-10-29 | 2001-05-15 | Nishi Nippon Chishitsu Chiyousashiyo:Kk | Double tube type on-site permeability test method and device |
| CN101858074A (en) * | 2010-06-10 | 2010-10-13 | 上海市城市建设设计研究院 | Construction method and device for on-site water injection test |
| CN203373718U (en) * | 2013-06-09 | 2014-01-01 | 机械工业勘察设计研究院 | Double-ring water filling experiment device |
Non-Patent Citations (4)
| Title |
|---|
| 中华人民共和国水利部: "《中华人民共和国水利行业标准SL345-2007》", 26 November 2007 * |
| 沈建: "常水头与变水头注水试验的对比分析", 《江苏水利》 * |
| 盛林: "常水头注水试验不同水头对渗透系数的影响", 《小水电》 * |
| 魏志范: "粉性土地区钻孔常水头注水试验求取渗透系数", 《岩土工程界》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109958434A (en) * | 2017-12-25 | 2019-07-02 | 核工业北京地质研究院 | The constant-pressure unsteady flow that drills drilling Hydrogeological Test Method |
| CN109958434B (en) * | 2017-12-25 | 2022-11-22 | 核工业北京地质研究院 | Drilling hydrogeological test method for drilling hole under constant pressure and unsteady flow |
| CN113791013A (en) * | 2021-08-31 | 2021-12-14 | 长江岩土工程有限公司 | Continuous water injection test method for drilling holes in soil impervious body of dam of dangerous reservoir |
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Application publication date: 20160803 |
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