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首页> 外文会议>International Symposium on Mine Safety Science and Engineering >Monitoring study of shaft lining concrete strain in freezing water-bearing soft rock during mine shaft construction period in West China
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Monitoring study of shaft lining concrete strain in freezing water-bearing soft rock during mine shaft construction period in West China

机译：西部矿井轴建设时期冷冻含水软岩中轴衬里混凝土应变的监测研究

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In the water-bearing soft rock strata of West China, a field measurement is carried out on the shaft lining in bedrock section. The shaft lining is built with freezing method. From the measurement, some changes of regularity in construction, thawing and post thawing period are obtained, including the temperature, freezing pressure and the vertical and hoop strain of the shaft lining. Measurement studies have shown that: during the plastic stage of shaft construction period, with the release of hydration heat, the thermal expansion occurs in the concrete and the strain gauge, leading to tensile strain. In the earlier stage, the elastic modulus and strength of concrete increases rapidly. When the shaft lining temperature reaches its maximum, the cooling and growth in the freezing pressure make the hoop strain increase sharply. However, the hoop strain is at lower tensile or compressive value. In the early stage and mature stage, the strain change is mainly affected by temperature. In the thawing and post thawing period, the concrete strain is also primarily influenced by temperature change. During the measurement, when the maximum compressive strain is less than ultimate value, the shaft lining is in a safe state. To ensure the security of the shaft lining, the concrete strength growth and sidewall temperature should be controlled in the similar shaft condition. In addition, the reinforcement ratio should not be too small for the shaft lining in frozen bedrock. And further, the fiber reinforced concrete, shrinkage-compensating concrete and low hydration heat concrete technology can also be adopted to reduce the cracks as much as possible and to avoid penetrating cracks. For the soft aquifers in West China, the further field measurement is still needed to obtain the stress and deformation regularities of the shaft lining, which can not only provide a basis for security assessment of the shaft, but also guide its design and optimization to improve the design theory.
机译：在西部的携带含水岩石地层中，在基岩部分的轴线上进行了田间测量。轴衬里采用冷冻方法构建。从测量中，获得了施工，解冻和后解冻期间规律性的一些变化，包括轴衬里的温度，冷冻压力和垂直和环箍应变。测量研究表明：在轴施工时段的塑料阶段，随着水化热的释放，热膨胀发生在混凝土和应变仪中，导致拉伸菌株。在早期的阶段，混凝土的弹性模量和强度迅速增加。当轴衬里温度达到其最大值时，冷冻压力的冷却和生长使得箍应变急剧增加。然而，箍菌株处于较低的拉伸或压缩值。在早期和成熟阶段，应变变化主要受温度的影响。在解冻和后解冻期间，混凝土应变也主要受温度变化的影响。在测量期间，当最大压缩应变小于最终值时，轴衬里处于安全状态。为确保轴衬砌的安全性，应在类似的轴状况下控制混凝土强度生长和侧壁温度。此外，加固比对于冷冻基岩中的轴衬里不宜太小。此外，还可以采用纤维增强混凝土，收缩补偿混凝土和低水合热混凝土技术，以尽可能地减少裂缝，避免渗透裂缝。对于西部的软含水层，仍然需要进一步的现场测量来获得轴衬里的应力和变形规律，这不仅可以为轴的安全评估提供基础，还可以指导其设计和优化来改善设计理论。

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