JP5882181B2 - Stability evaluation method of rock mass in rock slope by sound measurement - Google Patents

Stability evaluation method of rock mass in rock slope by sound measurement Download PDF

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JP5882181B2
JP5882181B2 JP2012238804A JP2012238804A JP5882181B2 JP 5882181 B2 JP5882181 B2 JP 5882181B2 JP 2012238804 A JP2012238804 A JP 2012238804A JP 2012238804 A JP2012238804 A JP 2012238804A JP 5882181 B2 JP5882181 B2 JP 5882181B2
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朋和 石原
朋和 石原
岳洋 太田
岳洋 太田
章裕 蒲原
章裕 蒲原
横山　秀史
秀史 横山
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本発明は、打音測定による岩盤斜面中の岩塊の安定性評価方法に関するものである。   The present invention relates to a method for evaluating the stability of a rock mass in a rock slope by sound measurement.

落石は、その発生の誘因が明瞭ではないことから、発生箇所や発生時期を予測することが困難な災害である。落石災害を防止するために、鉄道事業者等では定期的な検査が実施されているが、その内容は専門家による定性的な評価を主体としているのが現状である（下記非特許文献１参照）。このことから、現場技術者が簡易かつ定量的に落石の安定性を評価できる手法の確立が求められている。   Rockfall is a disaster that makes it difficult to predict where and when it occurs because the cause of its occurrence is not clear. In order to prevent rockfall disasters, regular inspections are carried out by railway operators, etc., but the content is mainly based on qualitative evaluation by experts (see Non-Patent Document 1 below) ). For this reason, establishment of a method by which field engineers can easily and quantitatively evaluate the stability of falling rocks is required.

特開２００９−２８７９２３号公報JP 2009-287923 A

財団法人鉄道総合技術研究所：落石対策技術マニュアル，１５４ｐ，１９９９.Railway Technical Research Institute: Technical manual for rockfall countermeasures, 154p, 1999. 石原朋和・川越健・長谷川淳・浦越拓野，太田岳洋：岩盤斜面における浮き石の安定性評価手法に関する検討，研究発表会講演論文集，ｐｐ. ２３９−２４０, ２０１０.Ishihara, K., Kawagoe, K., Hasegawa, T., Urakoshi, T., Ota, T .: Examination on the stability evaluation method of floats on rock slopes, Proceedings of the Conference, pp. 239-240, 2010. 川越健・石原朋和・浦越拓野・太田岳洋：岩盤斜面における岩塊の安定性に関する評価手法，鉄道総研報告，Ｖｏｌ. ２５, Ｎｏ. ７, ｐｐ. ３１−３６, ２０１１．Takeshi Kawagoe, Yukazu Ishihara, Takuno Urakoshi, Takehiro Ota: Evaluation methods for rock mass stability on rock slopes, Railway Research Institute report, Vol. 25, No. 7, pp. 31-36, 2011. 太田岳洋：打音測定による落石危険岩塊の安定性評価手法，技術交流会講演要旨，２０１１．Takehiro Ota: Stability evaluation method of rock fall hazard rock mass by hammering sound measurement, abstract of technical exchange meeting, 2011. 石原朋和：打音測定による岩盤斜面中の岩塊の安定性評価手法の開発，鉄道総研月例発表会講演要旨，２０１２．Ishihara, Y .: Development of a stability evaluation method for rock masses on rock slopes by percussion measurement, Abstracts of the Railway Research Institute monthly presentation, 2012.

しかしながら、既往の研究では、打音測定により岩塊の安定性を定量的に評価する手法について検討し、打音測定から得られる音圧スペクトルの卓越周波数やその最大振幅から岩塊の安定性が推定できる可能性を報告している（上記特許文献１、非特許文献２〜５参照）。そこでは、岩塊の測定結果を基盤岩の測定結果で除すことで正規化することで、岩種によらず基盤岩に比べて岩塊（安定岩塊、不安定岩塊）の方が音圧スペクトルの最大振幅が小さいことがわかっている（上記非特許文献３〜５参照）。   However, in previous studies, we investigated a method for quantitatively evaluating rock mass stability by percussion measurement, and the stability of the rock mass was determined from the dominant frequency of the sound pressure spectrum obtained from percussion measurement and its maximum amplitude. The possibility of being able to be estimated is reported (refer the said patent document 1, nonpatent literature 2-5). There, by dividing the measurement result of the rock mass by the measurement result of the base rock, the rock mass (stable rock mass, unstable rock mass) is better than the base rock regardless of the rock type. It is known that the maximum amplitude of the sound pressure spectrum is small (see Non-Patent Documents 3 to 5 above).

図４は従来の岩塊の安定性評価方法による結果を示す図である。   FIG. 4 is a diagram showing the results of a conventional rock mass stability evaluation method.

この図において、横軸は基盤岩の値で正規化した卓越周波数、縦軸は基盤岩の値で正規化した振幅であり、□は基盤岩、○は安定岩塊、×は不安定岩塊を示している。また、Ａは専門家の判断を要する領域、Ｂは安定と判断される領域、Ｃは不安定と判断される領域である。   In this figure, the horizontal axis is the dominant frequency normalized by the value of the basement rock, the vertical axis is the amplitude normalized by the value of the basement rock, □ is the basement rock, ○ is the stable rock mass, and x is the unstable rock mass Is shown. A is an area that requires expert judgment, B is an area that is determined to be stable, and C is an area that is determined to be unstable.

しかし、この方法では、不安定岩塊を安定岩塊と判定する場合があるなど閾値付近の岩塊の安定性を簡便に、かつ客観的に判定するのが困難である。   However, with this method, it is difficult to easily and objectively determine the stability of a rock block near the threshold, such as determining an unstable rock block as a stable rock block.

本発明は、上記状況に鑑みて、２段階評価により簡便にかつ客観的に岩塊の安定性を評価することができる、打音測定による岩盤斜面中の岩塊の安定性評価方法を提供することを目的とする。   In view of the above situation, the present invention provides a method for evaluating the stability of a rock mass in a rock slope by sound measurement, which can easily and objectively evaluate the stability of a rock mass by two-step evaluation. For the purpose.

本発明は、上記目的を達成するために、
〔１〕打音測定による岩盤斜面中の岩塊の安定性評価方法において、（ａ）打音検査装置を用いた基盤岩上の評価対象となる岩塊の打音測定により、０〜２０００Ｈｚの範囲で最大振幅を示すピークを抽出し、（ｂ）０〜５００Ｈｚの範囲において、前記（ａ）で抽出した前記最大振幅の１／２以上の振幅を示すピークがあるか否かを判定し、（ｃ）前記（ｂ）で、０〜５００Ｈｚの範囲に前記（ａ）で抽出した前記最大振幅の１／２以上の振幅を示すピークがある場合、前記岩塊は不安定岩塊であると判定し、前記（ａ）で抽出した前記最大振幅の１／２以上の振幅を示すピークがない場合、前記岩塊は安定性が不明であると判定し、（ｄ）前記（ｃ）で安定性不明と判定された場合、０〜２０００Ｈｚの範囲における最大振幅が前記基盤岩の最大振幅の２倍以上か否かを判定し、（ｅ）０〜２０００Ｈｚの範囲における前記最大振幅が前記基盤岩の最大振幅の２倍以上である場合、前記岩塊は不安定岩塊であると判定し、２倍未満である場合、前記岩塊は安定乃至不安定岩塊であると判定することを特徴とする。 In order to achieve the above object, the present invention provides
[1] In the stability evaluation method of rock mass on rock slope by impact sound measurement, (a) Range of 0-2000Hz by impact sound measurement of rock mass to be evaluated on basement rock using impact sound inspection device And (b) in the range of 0 to 500 Hz, it is determined whether or not there is a peak indicating an amplitude of 1/2 or more of the maximum amplitude extracted in (a). c) In the case of (b), if there is a peak indicating an amplitude of 1/2 or more of the maximum amplitude extracted in (a) in the range of 0 to 500 Hz, the rock mass is determined to be an unstable rock mass. If there is no peak showing an amplitude of 1/2 or more of the maximum amplitude extracted in (a), it is determined that the rock mass has unknown stability, and (d) the stability in (c) If it is determined that the unknown, the foundation maximum amplitude in the range of 0~2000Hz (E) When the maximum amplitude in the range of 0 to 2000 Hz is more than twice the maximum amplitude of the basement rock, the rock mass is an unstable rock mass It is determined that the rock mass is less than twice, and the rock mass is determined to be a stable or unstable rock mass.

本発明によれば、岩盤斜面中の不安定岩塊を簡便に、かつ、客観的に抽出することができる。   According to the present invention, an unstable rock mass in a rock slope can be extracted easily and objectively.

本発明による岩塊の安定性評価フローを示す図である。It is a figure which shows the stability evaluation flow of the rock block by this invention. 本発明の具体的適用例において０〜５００Ｈｚの範囲のピークに注目した判定結果を示す図である。It is a figure which shows the determination result which paid its attention to the peak of the range of 0-500 Hz in the specific application example of this invention. 本発明の具体的適用例において０〜２０００Ｈｚの範囲のピークに注目した判定結果を示す図である。It is a figure which shows the determination result which paid its attention to the peak of the range of 0-2000 Hz in the specific application example of this invention. 従来の岩塊の安定性評価方法による結果を示す図である。It is a figure which shows the result by the stability evaluation method of the conventional rock block.

岩塊の安定性評価方法において、（ａ）打音検査装置を用いた基盤岩上の評価対象となる岩塊の打音測定により、０〜２０００Ｈｚの範囲で最大振幅を示すピークを抽出し、（ｂ）０〜５００Ｈｚの範囲において、前記（ａ）で抽出した前記最大振幅の１／２以上の振幅を示すピークがあるか否かを判定し、（ｃ）前記（ｂ）で、０〜５００Ｈｚの範囲に前記（ａ）で抽出した前記最大振幅の１／２以上の振幅を示すピークがある場合、前記岩塊は不安定岩塊であると判定し、前記（ａ）で抽出した前記最大振幅の１／２以上の振幅を示すピークがない場合、前記岩塊は安定性が不明であると判定し、（ｄ）前記（ｃ）で安定性不明と判定された場合、０〜２０００Ｈｚの範囲における最大振幅が前記基盤岩の最大振幅の２倍以上か否かを判定し、（ｅ）０〜２０００Ｈｚの範囲における前記最大振幅が前記基盤岩の最大振幅の２倍以上である場合、前記岩塊は不安定岩塊であると判定し、２倍未満である場合、前記岩塊は安定乃至不安定岩塊であると判定する。 In the rock mass stability evaluation method, (a) the peak showing the maximum amplitude in the range of 0 to 2000 Hz is extracted by the sound measurement of the rock mass to be evaluated on the basement rock using the hammering test device, b) In the range of 0 to 500 Hz, it is determined whether or not there is a peak indicating an amplitude of 1/2 or more of the maximum amplitude extracted in (a), and (c) in (b), 0 to 500 Hz. If there is a peak showing an amplitude of 1/2 or more of the maximum amplitude extracted in (a) in the range, the rock mass is determined to be an unstable rock mass, and the maximum extracted in (a) When there is no peak indicating an amplitude of 1/2 or more of the amplitude, the rock mass is determined to have unknown stability. (D) When it is determined that the stability is unknown in (c), the rock mass is 0 to 2000 Hz. determine the maximum amplitude is whether more than twice the maximum amplitude of the bedrock in the region (E) When the maximum amplitude in the range of 0 to 2000 Hz is twice or more the maximum amplitude of the basement rock, the rock mass is determined to be an unstable rock mass, and when it is less than twice, The rock mass is determined to be a stable or unstable rock mass.

以下、本発明の実施の形態について詳細に説明する。   Hereinafter, embodiments of the present invention will be described in detail.

本発明による安定性評価方法は、次のように２段階に分割することができる。   The stability evaluation method according to the present invention can be divided into two stages as follows.

判定の第１段階では、岩塊の振動に関わる情報を含むと考えられる０〜５００Ｈｚのピークに注目し、０〜２０００Ｈｚの範囲の最大振幅に対する０〜５００Ｈｚの範囲の最大振幅の比を、岩塊の安定性評価の指標として判定を行う。後述する適用例では、０〜５００Ｈｚの範囲に振動測定の速度スペクトルの卓越周波数と一致する音圧スペクトルのピークが認められる。この値が、安定岩塊の場合は１０〜５０％、不安定岩塊の場合は１０〜１００％を示すことから、「不安定」、「安定性不明」の閾値を暫定的に５０％と設定した。   In the first stage of judgment, attention is paid to a peak of 0 to 500 Hz considered to include information related to rock mass vibration, and the ratio of the maximum amplitude in the range of 0 to 500 Hz to the maximum amplitude in the range of 0 to 2000 Hz is calculated. Judgment is performed as an index for evaluating the stability of the lump. In an application example to be described later, a peak of the sound pressure spectrum that matches the dominant frequency of the velocity spectrum of vibration measurement is recognized in the range of 0 to 500 Hz. Since this value is 10 to 50% for stable rock blocks and 10 to 100% for unstable rock blocks, the thresholds of “unstable” and “unstable stability” are temporarily set to 50%. Set.

次に、判定の第２段階では、基盤岩の最大振幅に対する岩塊の最大振幅の比を、岩塊の安定性評価の指標として更なる判定を行う。上述したように、岩塊の測定結果を基盤岩の測定結果で除することで正規化することにより、岩種によらず基盤岩に比べて岩塊（安定岩塊、不安定岩塊）の方が音圧スペクトルの最大振幅が大きいことがわかっている。そこで、本発明では、「不安定」、「安定〜不安定」の閾値を暫定的に基盤岩の振幅の２倍に設定した。   Next, in the second determination stage, the ratio of the maximum amplitude of the rock mass to the maximum amplitude of the basement rock is further used as an index for evaluating the stability of the rock mass. As mentioned above, by dividing the rock mass measurement result by the basement rock measurement result, the rock mass (stable rock mass, unstable rock mass) can be compared with the base rock regardless of the rock type. It is known that the maximum amplitude of the sound pressure spectrum is larger. Therefore, in the present invention, the thresholds of “unstable” and “stable to unstable” are provisionally set to twice the amplitude of the basement rock.

次に、本発明による安定性評価方法のフローについて具体的に説明する。   Next, the flow of the stability evaluation method according to the present invention will be specifically described.

図１は本発明による岩塊の安定性評価フローを示す図である。
（ａ）打音検査装置を用いた岩塊の打音測定により、０〜２０００Ｈｚの範囲で最大振幅を示すピークを抽出する（ステップＳ１）。
（ｂ）０〜５００Ｈｚの範囲において、ステップＳ１で抽出した最大振幅の１／２以上の振幅を示すピークがあるか否かを判定する（ステップＳ２）。
（ｃ）０〜５００Ｈｚの範囲に最大振幅の１／２以上の振幅を示すピークがある場合（ステップＳ２のＹＥＳ）、不安定岩塊と判定する（ステップＳ３）。あるいは、最大振幅の１／２以上の振幅を示すピークがない場合（ステップＳ２のＮＯ）、岩塊の安定性が不明であると判定する（ステップＳ４）。
（ｄ）安定性不明と判定された場合、０〜２０００Ｈｚの範囲における最大振幅が基盤岩の最大振幅の２倍以上か否かを判定する（ステップＳ５）。
（ｅ）０〜２０００Ｈｚの範囲における最大振幅が基盤岩の２倍以上である場合（ステップＳ５のＹＥＳ）、不安定岩塊と判定する（ステップＳ６）。あるいは、最大振幅が基盤岩の２倍未満である場合（ステップＳ５のＮＯ）、安定〜不安定岩塊と判定する（ステップＳ７）。 FIG. 1 is a diagram showing a rock mass stability evaluation flow according to the present invention.
(A) The peak which shows the maximum amplitude in the range of 0-2000 Hz is extracted by the impact sound measurement of the rock block using the impact sound inspection device (step S1).
(B) In the range of 0 to 500 Hz, it is determined whether or not there is a peak indicating an amplitude of 1/2 or more of the maximum amplitude extracted in step S1 (step S2).
(C) When there is a peak indicating an amplitude of 1/2 or more of the maximum amplitude in the range of 0 to 500 Hz (YES in step S2), it is determined as an unstable rock mass (step S3). Or when there is no peak which shows an amplitude more than 1/2 of the maximum amplitude (NO of step S2), it determines with the stability of a rock mass being unknown (step S4).
(D) When it is determined that the stability is unknown, it is determined whether or not the maximum amplitude in the range of 0 to 2000 Hz is at least twice the maximum amplitude of the basement rock (step S5).
(E) When the maximum amplitude in the range of 0 to 2000 Hz is twice or more that of the basement rock (YES in step S5), it is determined as an unstable rock mass (step S6). Alternatively, when the maximum amplitude is less than twice that of the basement rock (NO in step S5), it is determined as a stable to unstable rock mass (step S7).

なお、この安定性評価フローにおいて、ステップＳ１〜Ｓ４が上述した第１段階に相当し、ステップＳ５〜Ｓ７が第２段階に相当する。   In this stability evaluation flow, steps S1 to S4 correspond to the first stage described above, and steps S5 to S7 correspond to the second stage.

以下、本発明の具体的な適用例について説明する。   Hereinafter, specific application examples of the present invention will be described.

表１は具体的な適用例による判定結果を示しており、図２は本発明の具体的な適用例において０〜５００Ｈｚの範囲のピークに注目した判定結果を示す図、図３は本発明の具体的な適用例において０〜２０００Ｈｚの範囲のピークに注目した判定結果を示す図である。   Table 1 shows determination results according to specific application examples, FIG. 2 is a diagram showing determination results focusing on a peak in the range of 0 to 500 Hz in a specific application example of the present invention, and FIG. It is a figure which shows the determination result which paid its attention to the peak of the range of 0-2000 Hz in a specific application example.

Figure 0005882181
Figure 0005882181

ここでは、安山岩からなる斜面で適用した結果を示す。   Here, the result applied to the slope made of andesite is shown.

適用の結果、ハンマー打診および目視観察による定性的評価により不安定と判断された岩塊は、本発明の評価方法によっても全て不安定と判定された。   As a result of the application, all the rock blocks determined to be unstable by qualitative evaluation by hammering and visual observation were also determined to be unstable by the evaluation method of the present invention.

まず、不安定と判定された岩塊（岩塊９〜３３）のうち１０岩塊（岩塊１０，１４，１５，１７，１８，２２，２４，２５，２９，３３）で、０〜５００Ｈｚの範囲に最大振幅の１／２以上の振幅を示すピークが認められた。これは、本発明の安定性評価方法の第１段階で不安定岩塊と判定されたことを意味し、表１および図２においてＢ／Ａ（ここで、Ａは０〜２０００Ｈｚの最大振幅、Ｂは０〜５００Ｈｚの最大振幅）比は０．５０以上の値を示している。また、そのうち２岩塊（岩塊１８，２４）は、０〜５００Ｈｚの範囲のピークが０〜２０００Ｈｚの範囲の最大振幅と等しく、即ちＢ／Ａの値が１．００となっている。   First, 10 rock blocks (rock blocks 10, 14, 15, 17, 18, 22, 24, 25, 29, 33) among the rock blocks determined to be unstable (rock blocks 9 to 33), 0 to 500 Hz. A peak showing an amplitude of ½ or more of the maximum amplitude was observed in the range. This means that it was determined as an unstable rock mass in the first stage of the stability evaluation method of the present invention. In Table 1 and FIG. 2, B / A (where A is the maximum amplitude of 0 to 2000 Hz, (B is the maximum amplitude of 0 to 500 Hz) The ratio is 0.50 or more. Of the two rock masses (rock masses 18 and 24), the peak in the range of 0 to 500 Hz is equal to the maximum amplitude in the range of 0 to 2000 Hz, that is, the value of B / A is 1.00.

不安定と判定された岩塊のうち残りの１５岩塊（岩塊９，１１〜１３，１６，１９〜２１，２３，２６〜２８，３０〜３２）は、基盤岩の振幅との比較によって不安定と判定された。これは、本発明の安定性評価方法の第１段階では安定性不明と判定され、第２段階で不安定岩塊と判定されたことを意味し、表１および図３においてＡ／〔基盤岩の最大振幅〕の比は２．０以上の値を示している。また、そのうち１１岩塊（岩塊９，１２，１３，１６，１９，２０，２６〜２８，３０，３１）は、基盤岩の５倍以上の振幅を示し、即ちＡ／〔基盤岩の最大振幅〕の値が５．０以上となっている。   Of the rock masses determined to be unstable, the remaining 15 rock masses (rock masses 9, 11-13, 16, 19-21, 23, 26-28, 30-32) are compared with the amplitude of the basement rock. Judged to be unstable. This means that it was determined that the stability was unknown in the first stage of the stability evaluation method of the present invention, and that it was determined as an unstable rock mass in the second stage. In Table 1 and FIG. The ratio of the maximum amplitude] is 2.0 or more. Of these, 11 rock blocks (rock blocks 9, 12, 13, 16, 19, 20, 26-28, 30, 31) show amplitudes more than five times that of the basement rock, that is, A / [maximum of the basement rock] Amplitude] is 5.0 or more.

一方、定性的評価により安定と判断された岩塊（岩塊１〜８）は、本発明の評価方法では、３岩塊（岩塊５，６，８）が安定と判定され、５岩塊（岩塊１〜４，７）は不安定と判定された。   On the other hand, the rock blocks (rock blocks 1 to 8) determined to be stable by the qualitative evaluation are determined to be stable in the three rock blocks (rock blocks 5, 6, and 8) in the evaluation method of the present invention. (Rock blocks 1-4, 7) were determined to be unstable.

不安定と判定された５岩塊のうち１岩塊（岩塊１）は、０〜５００Ｈｚの範囲に最大振幅の１／２以上の振幅を示すピークが認められた（表１、図２参照）。残りの４岩塊（岩塊２〜４，７）は、Ａ／〔基盤岩の最大振幅〕の比が３．７〜５．２の値を示したが、これらの値は、定性的評価によっても不安定と判断された岩塊（岩塊９〜３３）に比べて低い傾向がある（図３参照）。   Among the 5 rock blocks judged to be unstable, 1 rock block (Block 1) showed a peak showing an amplitude of 1/2 or more of the maximum amplitude in the range of 0 to 500 Hz (see Table 1 and FIG. 2). ). The remaining four rock blocks (rock blocks 2 to 4 and 7) showed A / [maximum amplitude of basement rock] values of 3.7 to 5.2. These values were qualitatively evaluated. There is a tendency to be lower than the rock mass judged to be unstable (rock masses 9 to 33) (see FIG. 3).

以上のことから、本発明による打音測定による岩盤斜面中の岩塊の安定性評価方法によれば、目視観察等の定性的評価により不安定と判断される岩塊を全て不安定岩塊と判定することができ、さらに、定性的評価では安定と判断される岩塊についても不安定岩塊か否かを評価することができる。   From the above, according to the stability evaluation method of a rock mass in a rock slope by hammering sound measurement according to the present invention, all rock masses judged to be unstable by qualitative evaluation such as visual observation are all unstable rock masses. Further, it is possible to evaluate whether or not a rock block that is determined to be stable in the qualitative evaluation is an unstable rock block.

なお、本発明は上記実施例に限定されるものではなく、本発明の趣旨に基づき種々の変形が可能であり、これらを本発明の範囲から排除するものではない。   In addition, this invention is not limited to the said Example, Based on the meaning of this invention, a various deformation | transformation is possible and these are not excluded from the scope of the present invention.

本発明の打音測定による岩盤斜面中の岩塊の安定性評価方法は、２段階評価により簡便に、かつ、客観的に岩盤斜面中の岩塊の安定性を評価することができる、打音測定による岩盤斜面中の岩塊の安定性評価方法として利用可能である。   The method for evaluating the stability of a rock mass in a rock slope by the sound measurement according to the present invention can easily and objectively evaluate the stability of a rock mass in a rock slope by a two-step evaluation. It can be used as a method for evaluating the stability of rock masses in rock slopes by measurement.

Claims (1)

（ａ）打音検査装置を用いた基盤岩上の評価対象となる岩塊の打音測定により、０〜２０００Ｈｚの範囲で最大振幅を示すピークを抽出し、
（ｂ）０〜５００Ｈｚの範囲において、前記（ａ）で抽出した前記最大振幅の１／２以上の振幅を示すピークがあるか否かを判定し、
（ｃ）前記（ｂ）で、０〜５００Ｈｚの範囲に前記（ａ）で抽出した前記最大振幅の１／２以上の振幅を示すピークがある場合、前記岩塊は不安定岩塊であると判定し、前記（ａ）で抽出した前記最大振幅の１／２以上の振幅を示すピークがない場合、前記岩塊は安定性が不明であると判定し、
（ｄ）前記（ｃ）で安定性不明と判定された場合、０〜２０００Ｈｚの範囲における最大振幅が前記基盤岩の最大振幅の２倍以上か否かを判定し、
（ｅ）０〜２０００Ｈｚの範囲における前記最大振幅が前記基盤岩の最大振幅の２倍以上である場合、前記岩塊は不安定岩塊であると判定し、２倍未満である場合、前記岩塊は安定乃至不安定岩塊であると判定することを特徴とする打音測定による岩盤斜面中の岩塊の安定性評価方法。 (A) By the sound measurement of the rock mass to be evaluated on the basement rock using the sound inspection device, a peak showing the maximum amplitude in the range of 0 to 2000 Hz is extracted,
(B) In the range of 0 to 500 Hz, it is determined whether or not there is a peak indicating an amplitude of 1/2 or more of the maximum amplitude extracted in (a).
(C) In the case (b), when there is a peak showing an amplitude of 1/2 or more of the maximum amplitude extracted in the above (a) in the range of 0 to 500 Hz, the rock mass is an unstable rock mass And if there is no peak showing an amplitude greater than or equal to half of the maximum amplitude extracted in (a), the rock mass is determined to have unknown stability,
; (D) if it is determined that the stability unknown in (c), and determines whether or not the maximum amplitude is more than 2 times the maximum amplitude of the bedrock in the range of 0～2000Hz,
(E) When the maximum amplitude in the range of 0 to 2000 Hz is twice or more the maximum amplitude of the basement rock, the rock mass is determined to be an unstable rock mass, and when the rock mass is less than twice, the rock A method for evaluating the stability of a rock mass in a rock slope by sound measurement, wherein the mass is determined to be a stable or unstable rock mass.
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