CN111024926A - Ocean engineering rock mass quality scoring method based on simple test and fine test - Google Patents
Ocean engineering rock mass quality scoring method based on simple test and fine test Download PDFInfo
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Abstract
The invention discloses a method for grading the quality of a marine engineering rock mass based on simple and precise tests, and provides two specific methods for grading the marine engineering rock mass aiming at the particularity of the marine rock mass engineering, wherein a preliminary marine engineering rock mass quality grade can be quickly obtained based on site point load test, direct observation and longitudinal wave velocity test; and performing subsequent fine tests such as uniaxial compressive strength test, quantitative statistical test, qualitative description test, longitudinal wave velocity test, rock disintegration resistance test and the like on the ocean engineering rock mass to form more accurate ocean engineering rock mass quality score. The invention has the beneficial effects that: the method has sufficient theoretical basis and practical value, combines quick, simple and convenient test and accurate and fine test, provides reliable scoring parameters and technical support for the design and construction of the foundation of the marine rock mass engineering, and has strong operability and real and reliable scoring.
Description
Technical Field
The invention belongs to the technical field of ocean rock mass engineering, and particularly relates to an ocean engineering rock mass quality scoring method based on simple and convenient tests and fine tests.
Background
In the ocean rock engineering, because of the particularity of the existing seawater components, the ocean engineering rock generally has long-term interaction with seawater, and has a plurality of adverse effects on the strength and the discontinuous surface of the ocean engineering rock. Therefore, the method has profound engineering significance for evaluating the quality of the ocean engineering rock mass. The traditional rock mass quality classification method mainly aims at the rock mass of land engineering, and the complex construction environment and evaluation test conditions of ocean rock mass engineering have strong particularity, and the traditional method has weak applicability to the evaluation of the rock mass quality of ocean engineering and has many defects.
Disclosure of Invention
The invention aims to provide a marine engineering rock mass quality scoring method based on simple and precise tests aiming at the defects, the particularity of the marine rock mass engineering is considered on the basis of the traditional method, the preliminary quality scoring of the marine engineering rock mass can be quickly determined through the simple and convenient tests in an engineering field, the precise quality scoring of the marine engineering rock mass is obtained through various precise test means after field sampling, and reliable scoring parameters and technical support are provided for the basic design and construction of the subsequent marine rock mass engineering.
The technical solution comprises:
the ocean engineering rock mass quality grading method based on simple and convenient tests and fine tests comprises an ocean engineering rock mass quality grading method based on simple and convenient tests and an ocean engineering rock mass quality grading method based on fine tests. Ocean engineering rock mass quality scoring method based on simple test uses simple test index FORQ of ocean engineering rock mass quality to represent rockThe body mass, which considers three indexes, is respectively: fast rock strength scoring QF1Rock quality index RQD score QRQDAnd velocity score Q of longitudinal wavewThe simple and convenient test index FORQ calculation formula of the ocean engineering rock mass quality can be expressed as follows: FORQ ═ QF1+QRQD+Qw. The ocean engineering rock mass quality scoring method based on the fine test uses an ocean engineering rock mass quality index ORQ to represent the rock mass quality, and considers four indexes, namely: rock strength score Q1Number of discontinuous surfaces score Q2Discontinuous noodle piece scoring Q3And rock disintegration resistance index score Q4The calculation formula of the quality index ORQ of the ocean engineering rock mass can be expressed as follows: ORQ ═ Q1+Q2+Q3+Q4。
The ocean engineering rock mass quality grading method based on simple and convenient test specifically comprises the following steps:
① calculating rock strength quick score QF1The value range is 0 to 40, and the point load strength index I is obtained according to the site point load tests50And calculating to obtain the following formula: qF1＝1.12×(15.25×Is50)0.65When the calculation result is greater than 40, it is recorded as 40.
② calculating rock quality index RQD score QRQDAccording to field observation, calculating the ratio of the accumulated length of the columnar core equal to or larger than 10cm in each footage to each drilling footage to obtain an RQD value, and calculating according to the observation result value of a field rock quality index RQD, wherein the calculation formula is as follows: qRQD0.3 × RQD, said RQD scoring QRQDThe value ranges from 0 to 30.
③ calculating the wave velocity score QwObtaining the longitudinal wave velocity V of the engineering rock mass based on the on-site single-hole wave velocity testpmVelocity V of longitudinal wave of its entire rock massprComparing to obtain the rock wave velocity ratio Vpm/VprAccording to Vpm/VprQ is calculated by table lookup interpolation or wave velocity according to ocean engineering rock mass qualitywObtaining the wave velocity score Q by looking up the graph of the value schematic diagramwThe value ranges from 0 to 30.
④ simple and convenient test index FORQ for calculating the quality of oceanographic engineering rock massF1+QRQD+QwThe higher the score, the better the rock quality.
The ocean engineering rock mass quality grading method based on the fine test specifically comprises the following steps:
① calculate uniaxial compressive strength score Q1Obtaining the single-axis compressive strength UCS by carrying out the single-axis compressive strength test on the marine rock sample by using a formula Q1＝0.7×UCS0.65And calculating to obtain a score, and recording the score as 25 when the calculation result is more than 25.
② calculating the number of discontinuities score Q2The method can be obtained through quantitative statistical test, the field sketch means needs to test the discontinuous surface of the rock, the average discontinuous surface quantity per meter is counted, and the discontinuous surface quantity score Q is determined based on the average discontinuous surface quantity per meter by looking up a table2。
③ calculating a discontinuity condition score Q3Calculated by the following formula:
Q3＝A1+A2+A3
wherein A is1To take into account the score of the roughness of the rock surface, the greater the roughness, the higher the score of the term; a. the2To consider the score of the rock filler, the higher the degree of hardness of the filler, the higher the score; a. the3To consider the rock efflorescence degree score, the higher the efflorescence degree, the lower the term score; a. the1、A2、A3The method is determined by qualitatively describing the collected rock sample and then looking up the table.
④ calculating rock disintegration resistance index score Q4Performing a rock disintegration resistance test to obtain a rock disintegration resistance index Id2Looking up the table to obtain the rock collapse resistance index score Q4。
⑤ calculating the quality index ORQ of rock mass in ocean engineering1+Q2+Q3+Q4。
Optionally, parameters of a calculation formula in the ocean engineering rock mass quality scoring method based on the simple test and the fine test and reference values in a table are both experience values, and fine adjustment and improvement can be performed according to actual conditions.
Optionally, the ocean engineering rock mass quality scoring method based on simple and convenient tests can omit the wave velocity scoring Q under the condition that the relevant test means on site is insufficientwAt this time, the formula for the simple and convenient test index of the ocean engineering rock mass quality FORQ is FORQ 1.6 (Q)F1+QRQD)。
Optionally, in the ocean engineering rock mass quality scoring method based on simple and convenient tests, the number of discontinuous surfaces is scored to obtain Q2Or the longitudinal wave velocity V of the engineering rock mass can be obtained through the longitudinal wave velocity testpmVelocity V of longitudinal wave of its entire rock massprComparing to obtain the rock wave velocity ratio Vpm/VprAccording to Vpm/VprLooking up the table to obtain the wave velocity score QwThereby converting the number of discontinuous planes score Q2＝1.33×Qw。
The technical scheme has the following direct beneficial effects:
due to the particularity of the ocean rock mass engineering, the traditional rock quality evaluation method is not applicable and cannot truly and effectively reflect the quality condition of the ocean rock mass engineering, so that the rock mass quality evaluation method suitable for the ocean rock mass engineering needs to be researched. Meanwhile, the marine rock mass engineering has higher requirements on the timeliness and the precision of engineering survey, so a method for rapidly and accurately evaluating the quality of the marine engineering rock mass on an engineering site is also needed.
The invention provides an ocean engineering rock mass quality grading method based on simple and convenient test and a fine ocean engineering rock mass quality grading method based on consideration of the particularity of ocean rock mass engineering. The ocean engineering rock mass quality scoring method based on simple and convenient testing can quickly obtain relatively accurate engineering rock mass quality scoring through point load testing, direct observation and longitudinal wave velocity testing on an engineering site, and fills the blank of the field. Based on the method for finely testing the quality of the ocean engineering rock mass, the rock strength, the discontinuous surface condition and the rock collapse resistance are considered, the quality of the ocean engineering rock mass is comprehensively determined through fine testing means such as uniaxial compressive strength testing, quantitative statistical testing, qualitative description testing, longitudinal wave velocity testing, rock collapse resistance testing and the like, the considered factors are reasonable and comprehensive, the obtained grading accuracy is high, and the method is suitable for most of ocean rock mass engineering.
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The invention is further described below with reference to the accompanying drawings:
FIG. 1 is a schematic diagram of a simple and precise test method for the quality of an ocean engineering rock mass;
FIG. 2 shows the wave velocity score Q of the rock mass in ocean engineeringwAnd (4) value obtaining schematic diagrams.
Detailed Description
To more clearly describe the objects, techniques and advantages of this invention, a full and complete description of this invention is set forth in the following detailed description of the invention and the accompanying drawings. It should be noted that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments based on the embodiments of the present invention and without any other inventive work are within the scope of the present invention.
Example 1: taking the marine rock mass investigation of a certain practical engineering as an example, point load test, direct observation and longitudinal wave velocity test are carried out on an engineering site.
Aiming at the test result, the ocean engineering rock mass is simply tested and scored, and the method specifically comprises the following steps:
① calculating rock strength quick score QF1Point load strength index I obtained based on site point load tests50Is 6.84, calculate QF1＝1.12×(15.25×Is50)0.65＝23。
② calculating rock quality index score QRQDAccording to field observation, calculating the ratio of the accumulated length of the columnar core equal to or greater than 10cm in each footage to each drill return footage to obtain the RQD (maximum value) 67 of the rock sample, and calculating QRQD＝0.3×RQD＝20。
③ calculating the wave velocity score QwObtaining the elastic longitudinal wave velocity V of the on-site complete rock block based on the on-site single-hole wave velocity testpr3.437km/s, elastic longitudinal wave velocity V of rock masspmThe rock wave speed ratio V is obtained at 2.923km/spm/Vpr0.8461, obtaining a wave velocity score Q based on the rock wave velocity ratio table lookup interpolationw＝24。
④ simple and convenient test index FORQ for calculating the quality of oceanographic engineering rock massF1+QRQD+Qw23+20+ 24-67, which indicates better rock quality.
Through sampling rocks, respectively unfolding uniaxial compressive strength test, quantitative statistical test, qualitative description test, longitudinal wave velocity test and rock disintegration resistance test, thereby determining the fine test score of the quality of the oceanographic engineering rock mass, and the method comprises the following specific steps:
① calculating uniaxial compressive strength score Q of rock1Subjecting the rock sample to uniaxial compressive strength test to obtain uniaxial compressive strength UCS of 93MPa, and calculating Q1＝0.7×UCS0.65＝13。
② calculating the number of discontinuities score Q2Quantitatively describing and testing the discontinuous surfaces of the rock, counting that the average number of the discontinuous surfaces per meter is 3, and determining a discontinuous surface number score Q by looking up a table2Is 29。
③ calculating a discontinuity condition score Q3The roughness of the filler is flat and the filler is tested by qualitative description<5mm (hard) with moderate efflorescence, calculate Q3＝A1+A2+A3＝2+6+4＝12。
④ calculating rock disintegration resistance index score Q4: performing rock disintegration resistance test to obtain rock disintegration resistance index of 64%, and looking up table to obtain rock disintegration resistance index score Q4＝10。
⑤ calculating the quality index ORQ of rock mass in ocean engineering1+Q2+Q3+Q4＝13+29+12+10＝64。
Claims (8)
1. Ocean engineering rock mass quality scoring method based on simple test and fine test is characterized in that: the quality of the ocean engineering rock mass is graded by using an ocean engineering rock mass quality simple and convenient test index FORQ and an ocean engineering rock mass quality index ORQ, wherein the higher the numerical values of the ocean engineering rock mass quality simple and convenient test index FORQ and the ocean engineering rock mass quality index ORD are, the better the rock quality and the stability are;
the simple and convenient test index FORQ of the ocean engineering rock mass quality is obtained by a simple and convenient test-based ocean engineering rock mass quality grading method, and comprises three indexes, namely: fast rock strength scoring QF1Rock quality index score QRQDAnd velocity score Q of longitudinal wavewThe simple and convenient test index FORQ of the ocean engineering rock mass quality is represented by the following formula: FORQ ═ QF1+QRQD+Qw；
The quality index ORQ of the ocean engineering rock mass is obtained by an ocean engineering rock mass quality scoring method based on fine testing, and is composed of four parts of indexes, namely: rock strength score Q1Number of discontinuous surfaces score Q2Discontinuous noodle piece scoring Q3And rock disintegration resistance index score Q4The calculation formula of the ocean engineering rock mass quality index ORQ is as follows: ORQ ═ Q1+Q2+Q3+Q4。
2. The ocean engineering rock mass quality grading method based on simple test and fine test according to claim 1, characterized in that: quick grading Q for rock strength in simple and convenient test index FORQ of ocean engineering rock mass qualityF1The value range is 0 to 40, and the point load strength index I is obtained according to the point load tests50And calculating to obtain the following formula: qF1＝1.12×(15.25×Is50)0.65When the calculation result is greater than 40, it is recorded as 40.
3. The ocean engineering rock mass quality grading method based on simple test and fine test according to claim 1, characterized in that: the rock quality index RQD in the simple and convenient test index FORQ of the ocean engineering rock mass quality scores QRQDAnd the rock quality index RQD is obtained by calculation according to the observed result value of the rock quality index RQD, and the calculation formula is as follows: qRQD0.3 × RQD, said RQD scoring QRQDThe value ranges from 0 to 30.
4. The ocean engineering rock mass quality grading method based on simple test and fine test according to claim 1, characterized in that: simple and convenient test index FORQ medium wave velocity score Q of ocean engineering rock mass qualitywLongitudinal wave velocity V of engineering rock mass obtained based on single-hole wave velocity testpmCalculating the rock wave velocity ratio obtained by table lookup interpolation, wherein the rock wave velocity ratio is the longitudinal wave velocity V of the engineering rock mass of the area to be evaluatedpmAnd the longitudinal wave velocity V of the intact rock massprThe wave velocity score QwThe value ranges from 0 to 30.
5. The ocean engineering rock mass quality grading method based on simple test and fine test according to claim 1, characterized in that: rock strength score Q in ocean engineering rock mass quality index ORQ1Root of Chinese characterDetermining rock uniaxial compressive strength according to ocean rock sampling, wherein the value range is 0 to 25, and the rock strength score Q1Using the formula Q1＝0.7×UCS0.65And calculating to obtain the result, and recording the result as 25 when the calculation result is more than 25.
6. The ocean engineering rock mass quality grading method based on simple test and fine test according to claim 1, characterized in that: the number of discontinuous surfaces in the quality index ORQ of the ocean engineering rock mass is scored Q2The method is obtained by testing the quantity of the discontinuous surfaces in the ocean engineering rock mass, the average quantity of the discontinuous surfaces per meter needs to be counted in the discontinuous surface test, and the discontinuous surface quantity score Q is determined based on the lookup table of the average quantity of the discontinuous surfaces per meter2Said number of discontinuities score Q2The value range is 0 to 40 minutes.
7. The ocean engineering rock mass quality grading method based on simple test and fine test according to claim 1, characterized in that: discontinuous surface condition score Q in ocean engineering rock mass quality index ORQ3Said discontinuous noodle pieces score Q3Calculated by the following formula:
Q3＝A1+A2+A3
wherein A is1The method is used for scoring the roughness of the discontinuous surface of the ocean engineering rock mass, and the higher the roughness is, the higher the score is; a. the2The method is used for scoring the filler of the discontinuous surface of the ocean engineering rock mass, the smaller the thickness of the filler is, the higher the hardness degree is, and the higher the score is; a. the3Grading the weathering degree of the discontinuous surface of the ocean engineering rock mass, wherein the higher the weathering degree is, the lower the grading is; a. the1、A2、A3The value ranges from 0 to 7, from 0 to 6 and from 0 to 7 respectively, and the discontinuous surface condition score Q3The value ranges from 0 to 30.
8. The ocean engineering rock mass quality grading method based on simple test and fine test according to claim 1, characterized in that: rock collapse resistance index score Q in ocean engineering rock mass quality index ORQ4The index is obtained by looking up a table of rock disintegration resistance indexes obtained by a rock disintegration resistance test, and the rock disintegration resistance index score Q4The value ranges from 0 to 15.
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