Testing method for in-situ stress of weak rock mass based on hydraulic pillow monitoring
HAN Xiaoyu, DONG Zhihong, FU Ping, LIU Yuankun, YIN Jianmin, WANG Bin
(Key Laboratory of Geotechnical Mechanics and Engineering of the Ministry of Water Resources, Changjiang River Scientific Research Institute, Wuhan, Hubei 430010, China)
Abstract：In light of the significant impact of weak rock masses on engineering construction and the scarcity of applicable in-situ stress testing methods, an in-situ stress test method for weak rock mass based on hydraulic pillow monitoring was developed by applying the theory of rheological stress recovery. This paper provides a comprehensive summary of existing in-situ stress measurement methods for weak rock masses and their associated limitations. It discusses in detail the testing principles, devices, procedures, and result calculation processes of the proposed method. The measurement accuracy based on calibration test data is also estimated. The testing device is straightforward, allowing for in-situ stress or surrounding rock disturbance stress testing through probe combinations or distributed arrangements, thereby facilitating the acquisition of one-dimensional to three-dimensional in-situ stress data. The hydraulic pillow monitoring test has been successfully conducted in the fragmented powder rock formation of the Longpan—Qiaohou fault zone within the Xianglushan tunnel of the Central Yunnan Diversion Project, yielding monitoring data and borehole plane stress results over nearly three years. This marks the first implementation of in-situ stress testing directly within extremely soft rock in an active fault zone. A comparative test of hydraulic fracturing stress was performed at the edge of the same fault zone, with results indicating that the magnitudes of the principal stresses are relatively close. The application case and comparative testing results demonstrate the feasibility of the weak rock mass in-situ stress testing method based on hydraulic pillow monitoring. The developed hydraulic pillow device is well-designed, securely locked, and the testing procedures and calculation methods are reliable. The monitoring results from the engineering application case reflect the variations in disturbance stress within the surrounding rock, confirming that this method can be utilized for rock stress monitoring.
韩晓玉，董志宏，付 平，刘元坤，尹健民，王 斌. 一种基于液压枕监测的软弱岩体地应力测试方法[J]. 岩石力学与工程学报, 2025, 44(S2): 70-77.
HAN Xiaoyu, DONG Zhihong, FU Ping, LIU Yuankun, YIN Jianmin, WANG Bin.
Testing method for in-situ stress of weak rock mass based on hydraulic pillow monitoring
[1] 何满潮. 深部软岩工程的研究进展与挑战[J]. 煤炭学报，2014，39(8)：1 409–1 417.(HE Manchao. Progress and challenges of soft rock engineering in depth[J]. Journal of China Coal Society，2014，39(8)：1 409–1 417.(in Chinese))
[2] 丁秀丽，张雨霆，黄书岭，等. 隧洞围岩大变形机制、挤压大变形预测及应用[J]. 岩石力学与工程学报，2023，42(3)：521–544. (DING Xiuli，ZHANG Yuting，HUANG Shuling，et al. Large deformation mechanism of surrounding rock masses of tunnels，prediction method of squeezing large deformation and its application[J]. Chinese Journal of Rock Mechanics and Engineering，2023，42(3)：521–544.(in Chinese))
[3] 尚彦军，史永跃，曾庆利，等. 昆明上公山隧道复杂地质条件下TBM卡机及护盾变形问题分析和对策[J]. 岩石力学与工程学报，2005，24(21)：60–65.(SHANG Yanjun，SHI Yongyue，ZENG Qingli，et al. TBM jamming and deformation in complicated geological conditions and engineering measures[J]. Chinese Journal of Rock Mechanics and Engineering，2005，24(21)：60–65.(in Chinese))
[4] 刘泉声，刘 鹤，张鹏林，等. TBM卡机实时监测预警方法及其应用[J]. 岩石力学与工程学报，2019，38(增2)：3 354–3 361.(LIU Quansheng，LIU He，ZHANG Penglin，et al. Real-time monitoring and early warning approach of TBM jamming and its application[J]. Chinese Journal of Rock Mechanics and Engineering，2019，38(Supp.2)：3 354–3 361.(in Chinese))
[5] 王亚锋. 高黎贡山隧道TBM不良地质条件下卡机脱困施工关键技术[J]. 隧道建设(中英文)，2021，41(3)：441–448.(WANG Yafeng. Key technologies for TBM jamming release of Gaoligongshan tunnel under unfavorable geologies[J]. Tunnel Construction，2021，41(3)：441–448.(in Chinese))
[6] 蔡美峰. 地应力测量原理与技术[M]. 北京：科学出版社，2000：15–27.(CAI Meifeng. Principle and technology of Insitu stress measurement[M]. Beijing：Science Press，2000：15–27.(in Chinese))
[7] HUBBERT M K，WILLIS D. Mechanics of hydraulic fracturing[J]. Transactions of the AIME，1972，18(1)：369–390.
[8] ITO T，IGARASHI A，KATO H，et al. Crucial effect of system compliance on the maximum stress estimation in the hydrofracturing method：Theoretical considerations and field-test verification[J]. Earth Planets Space，2006，58：963–971.
[9] 蔡美峰. 不同岩石条件下地应力解除测量技术可靠性的试验研究[J]. 岩石力学与工程学报，1991，10(4)：339–353.(CAI Meifeng. Test and study of reliability of stress relief by overcoring techniques in different rock conditions[J]. Chinese Journal of Rock Mechanics and Engineering，1991，10(4)：339–353.(in Chinese))
[10] 韩晓玉，邬爱清，徐春敏. 地应力测量精度及其全要素量化表征研究[J]. 长江科学院院报，2021，38(8)：84–90.(HAN Xiaoyu，WU Aiqing，XU Chunmin. Geostress measurement accuracy and its extensive quantitative characterization[J]. Journal of Yangtze River Scientific Research Institute，2021，38(8)：84–90.(in Chinese))
[11] 乔 兰，张亦海，孔令鹏，等. 基于分段解除的深部空心包体应变计中非线性优化算法[J]. 煤炭学报，2019，44(5)：1 306–1 313. (QIAO Lan，ZHANG Yihai，KONG Lingpeng，et al. Non-linear optimization algorithm of hollow inclusion strain gauge measurement in deep rock based on section relieve[J]. Journal of China Coal Society，2019，44(5)：1 306–1 313.(in Chinese))
[12] 谷志孟，葛修润. 软岩地应力测量新方法的试验研究[J]. 岩石力学与工程学报，1994，13(4)：339–348.(GU Zhimeng，GE Xiurun. Testing study of new method for in-situ stress measurement in soft rock[J]. Chinese Journal of Rock Mechanics and Engineering，1994，13(4)：339–348.(in Chinese))
[13] 张 芳，刘泉声，张程远，等. 流变应力恢复法地应力测试及装置[J]. 岩土力学，2014，35(5)：1 506–1 513.(ZHANG Fang，LIU Quansheng，ZHANG Chengyuan，et al. Geostress measurement using rheological stress recovery method and its equipment[J]. Rock and Soil Mechanics，2014，35(5)：1 506–1 513.(in Chinese))
[14] MARTIN C D，LANYON G W. Measurement of in-situ stress in weak rocks at Mont Terri Rock Laboratory，Switzerland[J]. International Journal of Rock Mechanics and Mining Sciences，2003，40(7)：1 077–1 088.
[15] 韩晓玉，董志宏，付 平，等. 基于HI应变计的首次断裂带岩体地应力监测[J]. 长江科学院院报，2022，39(12)：1–7.(HAN Xiaoyu，DONG Zhihong，FU Ping，et al. Monitoring the geostress of rock mass in fault zone using Hollow inclusion strain gauge[J]. Journal of Yangtze River Scientific Research Institute，2022，39(12)：1–7.(in Chinese))
[16] 韩晓玉，付 平，邬爱清，等. 快速测定软岩地层地应力的测量装置及方法[P]. 中国：CN201910880351.9，2024–04–26.(HAN Xiaoyu，FU Ping，WU Aiqing，et al. Rapid determination of soft rock ground stress measurement device and method[P]. China：CN201910880351.9，2024–04–26.(in Chinese))
[17] 韩晓玉，董志宏，刘元坤，等. 钻孔用组合单向液压枕测深部断裂带地应力的装置及方法[P]. 中国：CN202110827116.2，2022–05–17.(HAN Xiaoyu，DONG Zhihong，LIU Yuankun，et al. The device and method of combined unidirectional hydraulic pillow for drilling to measure the ground stress of fault zone in depth[P]. China：CN202110827116.2，2022–05–17.(in Chinese))
[18] 刘 杰，王恩元，赵恩来，等. 深部工作面采动应力场分布变化规律实测研究[J]. 采矿与安全工程学报，2014，31(1)：61–65.(LIU Jie，WANG Enyuan，ZHAO Enlai，et al. Distribution and variation of mining-induced stress field in deep workface[J]. Journal of Mining and Safety Engineering，2014，31(1)：61–65.(in Chinese))
[19] 朱元广，刘泉声，蒋景东，等. 三向压力盒的嵌入效应及其应力测量特性模拟[J]. 岩土力学，2015，36(9)：2 728–2 736.(ZHU Yuanguang，LIU Quansheng，JIANG Jingdong，et al. Simulation of inclusion effect and stress measuring property of three-dimensional pressure cell[J]. Rock and Soil Mechanics，2015，36(9)：2 728–2 736. (in Chinese))
[20] 边智华，张利洁，景 锋，等. 软岩基本质量评价及强度特性试验方法研究[J]. 长江科学院院报，2008，25(5)：37–42.(BIAN Zhihua，ZHANG Lijie，JING Feng，et al. Study on base quality evaluation and strength characteristics test method about soft rock[J]. Journal of Yangtze River Scientific Research Institute，2008，25(5)：37–42.(in Chinese))
[21] 孙 钧. 岩石流变力学及其工程应用研究的若干进展[J]. 岩石力学与工程学报，2007，26(6)：1 081–1 106.(SUN Jun. Rock rheological mechanics and its advance in engineering applications[J]. Chinese Journal of Rock Mechanics and Engineering，2007，26(6)：1 081–1 106.(in Chinese))
[22] 中华人民共和国国家标准编写组. GB 50287—2016 水力发电工程地质勘察规范[S]. 北京：中国计划出版社，2016.(The National Standards Compilation Group of People?s Republic of China. GB50287—2016 Code for geological investigation on hydro-power engineering[S]. Beijing：China Planning Press，2016.(in Chinese))
[23] 刘允芳. 岩体地应力与工程建设[M]. 武汉：湖北科学技术出版社，2000：64–75.(LIU Yunfang. Geostress and engineering construction[M]. Wuhan：Hubei Science and Technology Press，2000：64–75.(in Chinese))
[24] 王旺盛，陈长生，王家祥，等. 滇中引水工程香炉山深埋长隧洞主要工程地质问题[J]. 长江科学院院报，2020，37(9)：154–159.(WANG Wangsheng，CHEN Changsheng，WANG Jiaxiang，et al. Major engineering geological problems of Xianglushan deep-buried long tunnel in central Yunnan water diversion project[J]. Journal of Yangtze River Scientific Research Institute，2020，37(9)：154–159.(in Chinese))
[25] 何 洵，李 铀. 隧道应力扰动区及其影响因素分析[J]. 铁道科学与工程学报，2019，16(11)：2 782–2 790.(HE Xun，LI Yu. Analysis of stress disturbance zone of tunnel and its influencing factors[J]. Journal of Railway Science and Engineering，2019，16(11)：2 782–2 790.(in Chinese))
2025, Vol. 44 
