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1996 Fiscal Year Final Research Report Summary

The rates of increase in weathered zones and decrease in rock strength

Research Project

Project/Area Number 07640609
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Geology
Research InstitutionCHUO UNIVERSITY

Principal Investigator

SUZUKI Takasuke  Chuo Univ. ; Fac.of Science and Engineering ; Professor, 理工学部, 教授 (60055168)

Co-Investigator(Kenkyū-buntansha) MATSUKURA Yukinori  Tsukuba Univ, ; Inst.of Geoscience ; Associate Professor, 地球科学系, 助教授 (80107341)
TAKAHASHI Ken-ichi  Chuo Univ, ; Fac.of Literature ; Professor, 文学部, 教授 (40129961)
Project Period (FY) 1995 – 1996
KeywordsWeathering / Weathered zones / Decrease in rock strength / Weathering rates / Rock properties / Mudstone / Sandstone
Research Abstract

The weathering rates of bedrock under dated erosional terraces were concluded as follows.
(1) The empirical equations were established to express the rates of increase in the thickness of each of four weathered zones, i.e.highly, moderately, slightly and faintly weathered zone. The relationships between the thickness of weathered zone (Z) and the weathering time (t) are expressed as Z=alphat^<beta>, Whera alpha and beta are constants. It is concluded that (1) the rates of increase in thickness of each weathered zone (dZ/dt) are not constant, but decelerate with time (t) gradually, and (2) the zones with lower weathering grades have a faster weathering rate.
(2) Comparism with mudstone and sandstone in the weathering rates (dZ/dt) shows that at first mudstone have larger weathering rates which increase in thickness of weathered zones than sandstone. The weathering rates of mudstone are decelerate with time and finally are passed by sandstone.
(3) The empirical equation that shows the rate of decrease in strength at arbitrary depth from the bedrock surface are established. Mudstone and sandstone have no change in strength from the start of weathering to the point where decrease in strength rapidly (t=7.8d^<1.2> in sandstone, t=4.2d^<1.4> in mudstone).
(4) Compare with mudstone and sandstone in the rate of decrease in strength (dR/dt), at the point near the bedrock surface, mudstone have larger than sandstone in weathering rates. On the order hand, at the deep point where deeper than 30cm from the surface, sandstone have lager than mudstone in weathering rates.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] 八戸昭一・平木信明・鈴木隆介: "ボーリングコアからみた侵食段丘面下の岩盤風化速度" 地形. 16巻. 75 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 八戸昭一・平木信明・鈴木隆介: "風化に伴う岩盤強度の経時的変化" 土質工学会発表講演集. 第2巻. 1179-1180 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hachinohe,Shoichi and Suzuki,Takasuke: "Weathering rates of bedrock forming marine terraces in Boso Peninsula,Japan." 地形. 16巻. 93-113 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hachinohe,Shoichi;Hiraki,Nobuaki and Suzuki,Takasuke: "Rates of decrease in bedrock strength due to weathering." Abst.of IAG-SEA conference. 44 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hachinohe,Shoichi;Hiraki,Nobuaki and Suzuki,Takasuke: "Rates of weathering and chanages in rock properties due to weathering." Abst.of IGC. (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hachinohe,Shoichi;Hiraki,Nobuaki and Suzuki,Takasuke: "Weathering Rates of Bedrockin Boso Peninsula,Japan" 中日地形総合大会論文集. 133-136 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hachinohe, Shoichi: "Hiraki Nobuaki and Suzuki, Takasuke, The weathering rates of bedrock under erosional surface with drilling core" TRANSACTIONS,JAPANESE GEOMORPHOLOGICAL UNION. VOL.16-1. 75 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hachinohe, Shoichi: "HirakiNobuaki and Suzuki, Takasuke, The temporal change in bedrock strength due to weathering" PROCEEDEING OF THIRTIETH JAPAN NATIONAL CONFERENCE ON SOIL MECHANICS AND FOUNDATION ENGINEERING. VOL.2. 1179-1180 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hachinohe, Shoichi and Suzuki, Takasuke: "Weathering rates of bedrock forming marine terraces in Boso Peninsula, Japan" TRANSACTION,JAPANESE GEOMORPHOLOGICAL UNION. VOL.16-2. 93-113 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hachinohe, Shoichi ; Hiraki Nobuaki and Suzuki, Takasuke: "Rates of decrease in bedrock strength due to weathering" Abst.of IAG-SEA conference. 44 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hachinohe, Shoichi ; Hiraki Nobuaki and Suzuki, Takasuke: "Rates of weathering and chanages in rock properties due to weathering" Abst.of IGC. (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hachinohe, Shoichi ; Hiraki Nobuaki and Suzuki, Takasuke: "Weathering Rates of Bedrock in Boso Peninsula, Japan" China-Japan Geomorphological Conference. 133-136 (1996)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1999-03-09  

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