Development of Downward Compact Conical-ended Borehole Overcoring Method for In-situ Stress Measurement at Great Depth.

开发用于大深度原地应力测量的向下紧凑锥端钻孔超取芯方法。

• 批准号: 09555317
• 负责人: MATSUKI Koji
• 金额: $ 5.12万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09555317/
• 关键词: Stress relief method; Compact Conical-ended Borehole Overcoring Method; Vertical borehole; Great depth; 大深度; 深部地圧測定; 地圧測定

Knowledge of in-situ stress at great depth is of fundamental importance for geothermal energy extraction and underground disposal of nuclear waste. In order to estimate In-situ stress at great depth with a high accuracy, Downward Compact Conical-ended Borehole Overcoring Method(DCCBO), which is one of stress relief method was developed. DCCBO method is applicable to a mud water-filled vertical/sub-vertical borehole.Main results obtained in this study are summarized as follows :1) An adhesive which is applicable lo a water-filled vertical/sub-vertical borehole bottom was selected.2) Diving-bell type bonding device which is applicable to a water-filled borehole at a depth of 500m was developed.3) 16-elements conical strain cell for DCCBO which contained nitrogen gas cylinder was developed.4) The usefulness of the developed 16-elements conical strain cell in the isotropic rock is verified by loading and unloading tests to the cubic specimen with a borehole.5) The usefulness of the gushing system of nitrogen gas from the tip of 16-elements conical strain cell is verified by laboratory test using a borehole model made of acrylic.6) Bonding test of 16-elements conical strain cell to a rock specimen under water-filled condition was successful.7) Specification of a multi-channel data logger for DCCBO was proposed.

对地热能量提取和核废料的地下处置，对原位压力的了解至关重要。为了以高精度，向下紧凑的锥形钻孔过度测量方法（DCCBO）的高精度估计原位应力，这是应力缓解方法之一。 DCCBO方法适用于充满泥水的垂直/垂直孔洞。在本研究中获得的结果总结如下：1）选择了一种适用于水填充水的垂直/次视孔孔底部的粘合剂。 2）开发适用于在500m深度的水井眼孔的潜水铃型粘合装置。3）16个元素DCCBO的圆锥应变电池，其中包含氮气缸。4） 16元素在各向同性岩石中的锥形应变电池通过用钻孔进行装载和卸载测试来验证立方样品。5）从16个元件锥形圆锥形菌株尖端的氮气涌入氮气的有用性通过实验室验证使用丙烯酸制成的钻孔模型。6）在水填充条件下对16个元素应变电池的键合测试成功。7）提出了DCCBO多通道数据记录仪的规范。

项目成果

相澤 勝: "深部地圧計測のための下向き円錐孔底ひずみ法の開発" 資源・素材学会平成11年度春季大会にて発表予定. (1999)

Masaru Aizawa：“开发用于测量深层地面压力的向下圆锥孔底部应变方法” 计划在日本自然资源和材料学会 1999 年春季会议上发表（1999 年）。

2) K.Sakaguchi, W.Iino, K.Matsuki: "Damage of Rock Core due to Tensile Stresses during Boring under In-situ Stresses and its Relation to DSCA."Proc.of Seminar on Rock Eng.and Rock Mech.in Int.Symp.on Research and Education in the 21st Century. 27-33 (2000

2) K.Sakaguchi、W.Iino、K.Matsuki：“原位应力下钻孔过程中因拉伸应力引起的岩芯损坏及其与 DSCA 的关系”。《岩石工程与岩石机械研讨会论文集》

K.Sakaguchi: "Damage of Rock Core due to Tensile Stress during Boring under Iin-situ Stresses and its Rclation to DSCA."Proc.of Seminar on Rock Eng.& Rock Mech.Int.symp.on Research and Education in the 21st Century. 27-33 (2000)

K.Sakaguchi：“原位应力下钻孔过程中因拉应力引起的岩芯损坏及其与 DSCA 的关系。”岩石工程研讨会论文集。

松木 浩二: "引張主応力解析に基づくコアディスキング形状と三次元地圧の関係" 資源と素材. 113・5. 317-324 (1997)

Koji Matsuki：“基于拉伸主应力分析的岩心盘形与三维地面压力之间的关系”资源与材料 113・5（1997）。

坂口 清敏: "円錐孔底ひずみ法との比較に基づくエアを用いた地圧測定法の石灰岩への適用性評価"資源と素材. 115. 517-524 (1999)

Kiyotoshi Sakaguchi：“基于与锥形孔底应变法的比较，评估使用空气到石灰石的地面压力测量方法的适用性”资源和材料 115. 517-524 (1999)。