CN103174122B - Lateral stress pore pressure probe used for testing soil static lateral pressure coefficient - Google Patents

Lateral stress pore pressure probe used for testing soil static lateral pressure coefficient Download PDF

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Publication number
CN103174122B
CN103174122B CN201210305900.8A CN201210305900A CN103174122B CN 103174122 B CN103174122 B CN 103174122B CN 201210305900 A CN201210305900 A CN 201210305900A CN 103174122 B CN103174122 B CN 103174122B
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probe
lateral
sidewall
lateral stress
stress
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CN103174122A (en
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蔡国军
刘松玉
邹海峰
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Southeast University
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Southeast University
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Abstract

The invention discloses a lateral stress pore pressure probe used for testing a soil static lateral pressure coefficient. An analog-digital converter (2) is arranged on the top portion of the upper half section of the probe, a side wall upper friction drum (3.1), an upper pore pressure filtering ring (5.1) and a pair of lateral stress sensors (6) are sequentially arranged on the lower portion of the analog-digital converter (2) from top to bottom, the lateral stress sensors (6) are symmetrically arranged on the outer wall of a feeler lever, and an upper pore space water pressure sensor (4.1) is arranged in the middle of the side wall upper friction drum (3.1). A three-component seismic detector (7), a clinometer (8), a side wall lower friction drum (3.2), a lower pore pressure filtering ring (5.2) and a cone probe (9) are sequentially arranged on the lower half section of the probe from top to bottom, and a lower pore space water pressure sensor (4.2) is arranged on the middle portion of the side wall lower friction drum (3.2). Signal and data transmission is achieved through connection of a coaxial-cable (1) and the analog-digital converter (2) arranged on the top portion of the probe. The lateral stress pore pressure probe has the advantages of being in-situ, rapid, continuous, economical and the like.

Description

For testing the lateral stress hole pressure probe of soil static lateral pressure coefficient
Technical field
The present invention relates to a kind of lateral stress hole pressure touching methods probe for testing soil static lateral pressure coefficient, belong in geotechnical engineering field a kind of can directly, the static sounding device of analytical test soil layer original position static lateral pressure coefficient continuously.
Background technology
Static sounding technology refers to and utilizes pressure apparatus by the sounding rod indentation test soil layer with contact probe, the static point resistance, side friction power etc. of throughput examining system test soil, some basic physical mechanics properties of soil can be determined, as the modulus of deformation of soil, the allowable bearing etc. of soil.The static sounding technology history of existing more than 80 year so far.Extensive use static sounding in the world, partly or entirely instead of the probing in engineering investigation and sampling.First China succeed in developing electric measuring type static sounding in nineteen sixty-five and be applied to prospecting.In recent years along with the fast development of sensor technology, occurred a lot of new static sounding technology, these technology can obtain the pore water pressure of soil layer, seismic wave, pollutant proterties, temperature, even image quickly and accurately.It is widely used in environmental geotechnical field abroad.China is more late in the research starting of novel static sounding sensor, and the penetration resistance that current domestic widely used single Double lumen intubation only can be tested or specific penetration resistance, side friction power, confirmable soil layer basic physical mechanics properties is very limited.All soil layer mechanics index of physics are the function of in situ stress state, and therefore in geotechnical engineering practice, the determination of soil in-situ stress state is most important.Static lateral pressure coefficient is defined as level suffered by soil layer to the ratio of stress with vertical stress, is one of basic index describing soil in-situ stress state.The mensuration of current static lateral pressure coefficient depends on flat dilatometer, other pressure instrument or high-quality drill hole sampling and laboratory test analysis, and existing static sounding technology is difficult to effectively determine this parameter as the most widely used original position investigation way in geotechnical engineering field.The present invention is based on conventional static sounding probe, propose a kind of can convenient, fast, soil static lateral pressure coefficient in-situ test instrument that testing cost is cheap, for geotechnical engineering practice provides strong testing tool.
Summary of the invention
Technical problem: the technical problem to be solved in the present invention is the defect existed for the quiet spy technology of domestic existing single doube bridge, proposes a kind of lateral stress hole pressure touching methods probe directly can measuring soil static lateral pressure coefficient.
Technical scheme: the lateral stress hole pressure probe for testing soil static lateral pressure coefficient of the present invention, analog-digital converter is provided with at the upper semisection top of probe, the bottom of analog-digital converter is provided with friction cylinder on sidewall, upper hole press filtration ring and a pair lateral stress sensor from top to bottom successively, lateral stress sensor is symmetricly set on the outer wall of feeler lever, and on sidewall, the middle part of friction cylinder is provided with pore water pressure sensor; Friction cylinder, lower opening press filtration ring and circular cone probe under the lower semisection of probe is provided with 3-component earthquake detector, inclinometer, sidewall from top to bottom successively, under sidewall, the middle part of friction cylinder is provided with lower pore water pressure sensor; Adopt coaxial cable to connect with analog-digital converter transmission of signal and data at the top of this probe.
The surface of lateral stress sensor is circular, and its projected area is 400mm 2.
The cone angle of circular cone probe is 60 °, and cone basal cross section amasss as 10cm 2, on sidewall, under friction cylinder, sidewall, friction cylinder surface area is 150cm 2.
The thickness 5mm of upper hole press filtration ring, lower opening press filtration ring, be positioned at cone shoulder position, the effective area ratio of probe is 0.8.
The lateral stress hole pressure touching methods probe surveying soil static lateral pressure coefficient of the present invention, its static lateral pressure coefficient measure portion is primarily of the Circuits System composition of sidewall friction cylinder, hole press filtration ring, pore water pressure sensor and lateral stress sensor and inside thereof.A large amount of theoretical researches shows, side friction power is very responsive to stress to the level of soil layer, and therefore measured by sidewall friction cylinder, side friction power can reflect the horizontal stress state of soil layer to a great extent.Hole press filtration ring and pore water pressure sensor can determine the pore water pressure at MTD place, contribute to effective stress and the stress path of determining soil layer.The horizontal stress size of soil layer in lateral stress sensor determination penetration process.Measured each parameter is converted to after data signal through analog-digital converter preserves in co-axial cables transport to the Microcomputer Collecting and storage system on earth's surface, then according to the static lateral pressure coefficient of theoretical empirical formula draw calculation procedure calculation side to soil layer around strain gauge, the sectional drawing of real-time continuous is drawn.
Beneficial effect: in geotechnical engineering practice, the determination of native in situ stress state is most important.Static lateral pressure coefficient is defined as level suffered by soil layer to the ratio of stress with vertical stress, is one of basic index describing soil in-situ stress state.The mensuration of current static lateral pressure coefficient depends on flat dilatometer, other pressure instrument or high-quality drill hole sampling and laboratory test analysis, and existing static sounding technology is difficult to effectively determine this parameter as the most widely used original position investigation way in geotechnical engineering field.
The invention solves the defect that the quiet spy technology of domestic existing single doube bridge can not measure soil layer static lateral pressure coefficient, energy is convenient, fast, the original position static lateral pressure coefficient of continuous measurement conehead depth soil layer, makes static sounding technology to be engaged in geotechnical engineering field more accurately, all sidedly.This technology has the feature of continuity, reliability and repeatability.
Accompanying drawing explanation
Fig. 1 is component arrangement figure of the present invention;
Wherein have: coaxial cable 1, analog-digital converter 2, friction cylinder 3.1 on sidewall, friction cylinder 3.2 under sidewall, upper pore water pressure sensor 4.1, lower pore water pressure sensor 4.2, upper hole press filtration ring 5.1, lower opening press filtration ring 5.2, lateral stress sensor 6,3-component earthquake detector 7, inclinometer 8, circular cone probe 9.
Detailed description of the invention
The hole pressure touching methods probe surveying soil static lateral pressure coefficient of the present invention adopts coaxial cable 1 transmission of signal and data, analog-digital converter 2 is provided with at the upper semisection top of probe, the bottom of analog-digital converter 2 is provided with friction cylinder 3.1 on sidewall, upper hole press filtration ring 5.1 and a pair lateral stress sensor 6 from top to bottom successively, lateral stress sensor 6 opposes device on the outer wall of feeler lever, and on sidewall, the middle part of friction cylinder 3.1 is provided with pore water pressure sensor 4.1; Friction cylinder 3.2, lower pore water pressure sensor 4.2, lower opening press filtration ring 5.2 and circular cone probe 9 under the lower semisection of probe is provided with 3-component earthquake detector 7, inclinometer 8, sidewall from top to bottom successively.
The surface of lateral stress sensor is circular, and its projected area is 400mm 2.
Circular cone probe cone angle is 60 °, and cone basal cross section amasss as 10cm 2, sidewall friction cylinder surface area 150cm 2.
Hole press filtration ring thickness 5mm, the effective area ratio of probe is 0.8.
This probe is integrated with the function (can survey end resistance, frictional resistance) of conventional static sounding and the function of test beds original position static lateral pressure coefficient, has further developed the content of static sounding technology.
A large amount of theoretical researches shows, side friction power is very responsive to stress to the level of soil layer, and therefore measured by sidewall friction cylinder, side friction power can reflect the horizontal stress state of soil layer to a great extent.Hole press filtration ring and pore water pressure sensor can determine the pore water pressure at MTD place, contribute to effective stress and the stress path of determining soil layer.The horizontal stress size of soil layer in lateral stress sensor determination penetration process.Measured each parameter is converted to after data signal through analog-digital converter preserves in co-axial cables transport to the Microcomputer Collecting and storage system on earth's surface, then according to the static lateral pressure coefficient of theory-empirical formula factorization calculation side to soil layer around strain gauge, the sectional drawing of real-time continuous is drawn.
According to definition, static lateral pressure coefficient K 0be defined as original position level to stress σ h0with original position vertical stress σ v0ratio, i.e. K 0h0/ σ v0.In engineering practice, the value of original position vertical stress is often easily determined:
σ v 0 = Σ γ i · z i
γ in formula iand z ibe respectively i-th layer of native severe and thickness.Original position level is then difficult to determine to stress.
When in the injection soil body of popping one's head in, will produce the increase of lateral stress, therefore measured level is to stress σ hcfor original position lateral stress σ h0with lateral stress increment Delta σ hsum:
σ hc=σ h0+Δσ h
If the hydrostatic pressure at measured lateral stress sensor depth place is u 4, then each effective stress of this depth is respectively:
σ′ hc=σ hc-u 4σ′ h0=σ h0-u 4
For sand, the large result of index slot and laboratory test shows, the level of injection is to effective stress σ ' hcwith original position level to effective stress σ ' h0there is following relational expression:
σ hc ′ σ h 0 ′ = 0.000789 · [ q c - σ m σ m ′ ] 1.44
Q in formula cfor actual measurement static point resistance value, σ mwith σ ' mbe respectively original position mean stress and original position mean effective stress, calculate as follows respectively:
σ m = 2 3 ( 2 σ h 0 + σ v 0 ) σ′ m=σ m-u 4
Variously carry out iterative computation according to above-mentioned, the original position static lateral pressure coefficient of sand can be obtained.
For clay, theoretical according to cavity expansion, there is following relational expression to stress and injection level in the original position level of soil layer between stress:
σ h0=σ hc-s u(1+lnI r)
I in formula rfor the rigidity index of soil layer, constant be can be taken as to a certain soil; s ufor the undrained shear strength of clay, following formula can be adopted to calculate:
s u=(q cvo)/16
In conjunction with above-mentioned two formulas, can determine that the original position level of clay is to stress and original position static lateral pressure coefficient.In engineering practice, adopt computer process can obtain continuous print original position static lateral pressure coefficient section, more intuitively, fast.Method of the present invention has the feature of continuity, reliability and repeatability.

Claims (1)

1. pop one's head in for the lateral stress hole pressure of testing soil static lateral pressure coefficient for one kind, it is characterized in that being provided with analog-digital converter (2) at the upper semisection top of probe, the bottom of analog-digital converter (2) is provided with friction cylinder on sidewall (3.1), upper hole press filtration ring (5.1) and a pair lateral stress sensor (6) from top to bottom successively, lateral stress sensor (6) is symmetricly set on the outer wall of feeler lever, and on sidewall, the middle part of friction cylinder (3.1) is provided with upper pore water pressure sensor (4.1); Friction cylinder (3.2), lower opening press filtration ring (5.2) and circular cone probe (9) under the lower semisection of probe is provided with 3-component earthquake detector (7), inclinometer (8), sidewall from top to bottom successively, under sidewall, the middle part of friction cylinder (3.2) is provided with lower pore water pressure sensor (4.2); Connect with analog-digital converter (2) at the top of this probe employing coaxial cable (1) transmission of signal and data;
The surface of lateral stress sensor (6) is circular, and its projected area is 400mm 2;
The cone angle of circular cone probe (9) is 60 °, and cone basal cross section amasss as 10cm 2, on sidewall, under friction cylinder (3.1), sidewall, friction cylinder (3.2) surface area is 150cm 2;
The thickness of upper hole press filtration ring (5.1), lower opening press filtration ring (5.2) is 5mm, and lower opening press filtration ring (5.2) is positioned at cone shoulder position, and the effective area ratio of probe is 0.8.
CN201210305900.8A 2012-08-27 2012-08-27 Lateral stress pore pressure probe used for testing soil static lateral pressure coefficient Expired - Fee Related CN103174122B (en)

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CN103898890B (en) * 2014-03-20 2017-01-18 中冶集团武汉勘察研究院有限公司 Soil layer quantization layering method based on double-bridge static sounding data of BP neural network
CN104280166B (en) * 2014-09-23 2017-07-28 同济大学 Monitoring and warning Rock And Soil assigns the conduit tube component of water and safe condition
CN105507225B (en) * 2015-12-16 2017-03-29 东南大学 One kind can stop formula goalpost shape pore pressure probe
CN105804040B (en) * 2016-05-05 2017-09-15 中国能源建设集团江苏省电力设计院有限公司 A kind of small-sized cone penetration test two-bridge probe
CN106525596B (en) * 2016-11-04 2019-06-21 东南大学 Lateral bedding counter-force coefficient indoor test device under different stress paths
CN106759220B (en) * 2017-02-20 2019-02-05 中铁第四勘察设计院集团有限公司 The method of coefficient of static earth pressure is quickly measured using static cone penetration resistance
CN110144869A (en) * 2019-05-21 2019-08-20 东南大学 A kind of more sidewall friction cylinder CPTU devices and its measurement method with rectangular pyramid protrusion
CN110359441A (en) * 2019-06-20 2019-10-22 东南大学 Wireless hole pressure touching methods test macro based on sonic transmissions

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JP3820364B2 (en) * 2001-11-12 2006-09-13 株式会社共和電業 Penetration sensor for penetration test
CN1532547A (en) * 2003-03-25 2004-09-29 中国海洋大学 Detector for solibody in-situ hole pressure and affecting depth under wave action
CN1793917A (en) * 2005-12-09 2006-06-28 铁道第三勘察设计院 Probe for in-situ real time measuring saturated fine soil borizontal stress and measuring, calculating method
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