共查询到12条相似文献,搜索用时 62 毫秒
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北岭煤矿地应力测量及其特征分析 总被引:1,自引:0,他引:1
为弄清北岭煤矿浅部应力状态及分布特征,采用空心包体应力解除法进行地应力测量。结果表明:该区的地应力以水平构造应力为主,且均为压应力;最大主应力位于近水平方向,为近东西向;各测点均有两个主应力接近水平方向,另一个主应力接近垂直方向,垂直主应力值基本等于自重应力;位于近水平面内的两个主应力值相差较大,三个测点近水平面内的两个主应力的比值分别为1.83、1.88、1.84;在同一平面内,地应力的大小和方向没有出现突变现象,说明矿区的地应力场比较均匀。此次地应力测量为矿区进行围岩稳定性分析及开挖设计科学化提供了理论依据。 相似文献
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方祖烈;路长全 《岩石力学与工程学报》1992,11(1):96-096
本文通过西石门铁矿的地应力量测和应力场的反分析,对该矿区地应力场首次进行了系统的研究,提出了西石门铁矿的应力场是以水平应力为主的旋转压应力场,从南到北,其水平主应力方向为北东→北南→北西向;揭示了水平主应力随深度变化的规律以及平均水平主应力与垂直主应力之比“K”值随深度变化的规律;并从力学角度探讨了应力场与井下巷道稳定、采矿工程设计之间的关系,为地下采矿科学化提供了理论依据。 相似文献
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地应力测量中温度补偿方法的研究 总被引:14,自引:6,他引:8
蔡美峰 《岩石力学与工程学报》1991,10(3):227-227
许多地应力测量技术和仪器使用电阻应变片作为传感元件,温度补偿是影响该类仪器工作性能的重要因素.传统的温度补偿片方法效果很差,本文介绍了一套新的技术和系统,可以实现非常有效的温度补偿,从而基本上消除温度变化对测量结果的影响,大幅度提高测量精度. 相似文献
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简要介绍了当前各种地应力测量方法,对其工作原理、优缺点及适用条件进行了阐述.对地应力测量中存在的问题及应注意事项进行深入探讨,最后就地应力测量今后的发展趋势进行了展望. 相似文献
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水压致裂法三维地应力测量 总被引:23,自引:17,他引:23
刘允芳 《岩石力学与工程学报》1991,10(3):246-246
水压致裂法地应力测量,具有突出的优点,已被国内外广泛应用,但历来只是在单钻孔内测量平面应力场.本文首先简单地介绍了这种地应力测量的测试技术,然后在钻孔围岩的力学分析的基础上,提出了三维地应力测量的原理和方法,严格地推导了计算公式,并举有算例. 相似文献
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深孔水压致裂地应力测量及应力场反演分析 总被引:2,自引:1,他引:2
万福煤矿是一座拟建特大型矿井,上覆冲积层厚度高达700 m,主煤层平均埋深达1 004.12 m。选择7个勘探钻孔、37个试验段进行深孔水压致裂地应力测量。为保证超千米深孔地应力测量的成功,对传统水压致裂法的测试技术和设备进行改进,提高系统的耐压能力和测试精度。测孔最大水平主应力与垂直主应力的比值较大,平均为1.97,说明勘探区现今应力场以水平应力为主导。测得的21个印模中有18个点位于NEE-SWW向,3个点位于NW-SE向,符合本区震源机制解得出的挤压应力场方向,且与新构造活动所反映的区域构造应力场方向一致。结合实际的地质条件和地层参数,在实测地应力结果的基础上,提出基于有限元三维地应力拟合分析法反演勘探区现今地应力场,给出煤层顶板主应力分布曲线并分析井下可能出现的各类不良地质现象。 相似文献
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《Soils and Foundations》2022,62(6):101223
Granulated bentonite mixtures (GBMs) have been regarded as effective buffer materials in the deep geological disposal of radioactive waste due to their operational advantages, such as ease of transportation and in-situ placement/backfilling. Many studies have been done to characterize the hydraulic and thermal properties of GBMs as well as their swelling properties. Only limited studies, however, have investigated their gas transport properties, even though these properties affect their compactness during in-situ placement/backfilling and subsequent gas diffusion and advection in the buffer zone. The aim of this study is to understand the gas transport parameters, i.e., air permeability (ka) and gas diffusivity (Dp/Do), of tested samples compacted at different dry densities (DDs) under air-dried conditions, linking them with the measured density distribution characteristics determined by microfocus X-ray computed tomography (MFXCT) analysis. Two types of GBMs were used in this study: 1) FE-GBM (prepared from National Standard® bentonite, Wyoming, USA): this material was used in the Full-scale Emplacement (FE) experiment at the Mont Terri rock laboratory, Switzerland) and 2) OK-GBM (prepared from a bentonite, originating from Japan, with the trade name of OK bentonite, Kunimine Industries). The tested samples were firstly packed in a 100-cm3 acrylic core with different DDs, ranging from loose to dense (1.09 to 1.75 g/cm3), and scanned by MFXCT. The weighting factors, wf (fine fraction; lower density) and wc (coarse fraction; higher density) (wf + wc = 1), were determined after the peak separation of the measured CT brightness histograms from the reconstructed three-dimensional multiplanar reconstruction (MPR) images of the MFXCT analysis. The measured ka and Dp/Do were highly dependent on the DDs, the ka (?) values fitted well with a power law model, and the Dp/Do (?) was predicted accurately by several previously proposed models. For both FE-GBM and OK-GBM, there were good linear relationships between the gas transport parameters and wc × DD, implying that the weight of the coarse fraction controlled ka and Dp/Do. Moreover, the Kozeny-Carman model, incorporating the measured volumetric surfaces from the MFXCT analysis, was able to predict the ka values well. 相似文献