岩土力学 ›› 2024, Vol. 45 ›› Issue (S1): 391-404.doi: 10.16285/j.rsm.2023.0468

• 基础理论与实验研究 • 上一篇    下一篇

裂隙型类岩竖井注浆帷幕试样开挖卸荷响应试验研究

周禹良1, 2, 3，侯公羽4，李生生2, 3，贺文2, 3, 4，杨雪2, 3，赵庆儒4，黄佳铭4   

  1. 1. 华北科技学院 安全工程学院，河北 廊坊 065201；2. 北京中煤矿山工程有限公司，北京 100013； 3. 矿山深井建设技术国家工程研究中心，北京 100013；4. 中国矿业大学（北京）力学与建筑工程学院，北京 100083
  • 收稿日期:2023-04-14 接受日期:2023-07-18 出版日期:2024-09-18 发布日期:2024-09-20
  • 作者简介:周禹良，男，1989年生，博士，助理研究员，主要从事矿山岩体力学、注浆堵水与加固方面的研究工作。E-mail: zhouylscbj@sina.com
  • 基金资助:
    国家自然科学基金面上项目（No.51574247，No.51874173）；国家自然科学基金联合基金重点项目（No.U2034205）；天地科技股份有限公司科技创新项目（No.2021-TD-QN004）。

Experimental study on excavation unloading response of fractured rock-like grouting curtain sample for vertical shaft

ZHOU Yu-liang1, 2, 3, HOU Gong-yu4, LI Sheng-sheng2, 3, HE Wen2, 3, 4, YANG Xue2, 3, ZHAO Qing-ru4, HUANG Jia-ming4   

  1. 1. School of Safety Engineering, North China University of Science and Technology, Langfang, Hebei 065201, China; 2. Beijing China Coal Mine Engineering Co., Ltd., Beijing 100013, China; 3. National Engineering Research Center of Deep Shaft Construction, Beijing 100013, China; 4. School of Mechanics and Civil Engineering, China University of Mining & Technology-Beijing, Beijing 100083, China
  • Received:2023-04-14 Accepted:2023-07-18 Online:2024-09-18 Published:2024-09-20
  • Supported by:
    This work was supported by the General Program of National Natural Science Foundation of China (51574247, 51874173), the Key Program of Joint Funds of the National Natural Science Foundation of China (U2034205) and the Technology Innovation Project of Tiandi Science & Technology Co., Ltd. (2021-TD-QN004).

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摘要： 为研究竖井注浆帷幕围岩开挖卸荷响应，利用裂隙型类岩竖井注浆帷幕试样进行三轴开挖卸荷模拟试验，测试了开挖卸荷过程中试样的应变响应，并采用CT扫描对开挖卸荷后试样的破裂模式和破坏范围进行分析。结果表明：开挖卸荷后试样应变响应随半径的增大而迅速衰减，且卸荷阶段的应变占主体；开挖卸荷后试样中浆液结石体和基质岩块的变形不连续，液结石体的变形大于基质岩块的变形；单液水泥浆充填的注浆帷幕试样抗变形能力强，试样中相同半径处的切向应变与径向应变都明显小于黏土水泥浆充填的注浆帷幕试样；应力水平对试样开挖卸荷响应具有重要影响，应力水平越高，卸荷阶段的变形越剧烈，卸荷阶段的应变占比更高。开挖卸荷后，单液水泥浆充填试样易沿着浆液结石体与预制裂隙的接触面发生开裂，破裂半径为开挖半径的1.2～1.5倍；黏土水泥浆充填试样破坏模式复杂，破裂半径为开挖半径的1.5～2.0倍。研究成果可为井筒水害防治中竖井注浆帷幕设计提供参考。

关键词: 深部开采, 竖井, 注浆帷幕, 开挖卸荷, 应变响应

Abstract: To study the excavation unloading response (EUR) of the surrounding rock of grouting curtain for vertical shaft, a triaxial excavation unloading test was conducted using fractured rock-like sample of vertical shaft grouting curtain (VSGC). The strain response of the VSGC sample was measured during the simulated excavation uloading process. Furthermore, the cracking mode and damage radius of the VSGC samples after excavation unloading were analyzed using CT scanning. Results indicate that the strain response of the VSGC sample after excavation unloading decreases rapidly with the increase of radius, with the strain during the excavation unloading stage dominating the total strain. Additionally, with the deformation of the grout stone being greater than that of the rock-like matrix. Moreover, the VSGC sample filled with cement grout exhibits has stronger deformation resistance than VSGC sample filled with clay cement grout. Hence, both the tangential and radial strains at the same radius in the sample filled with cement grout are significantly smaller than those sample filled with clay cement grout. Furtherly, the initial stress level significantly impacts the EUR of the VSGC sample, and the higher the stress level, the more severe the deformation during the excavation unloading stage, and the higher the proportion of strain during the excavation unloading stage. Finally, the VSGC samples filled with cement grout are prone to cracking along the contact surface between the grout stone and the prefabricated cracks, with the damage radius being 1.2 to 1.5 times the excavation radius. On the other hand, the cracking behavior of VSGC samples filled with clay-cement grout is complex, and the damage radius ranges from 1.5 to 2.0 times the excavation radius. The research findings can offer technical insights for designing grouting curtain for vertical shaft in the prevention and control of shaft water hazards.

Key words: deep mining, vertical shaft, grouting curtain, excavation unloading, strain response

中图分类号: TU452
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