ThermoMechaLimestone

This data set gives more than 11 years of temperature and displacements recorded on and in a limestone cliff. An extensive presentation of the monitoring device can be found in (Gasc-Barbier et al., 2020, 2015) and is summarized below. Interpretation of data is proposed in Gasc-Barbier et al. (2021)
LaRG20102021_instrum.jpg displays the hazard zone. We can see a perched cave in a limestone cliff where a part of its roof had collapsed. On its roof an unstable beam reminds. This remaining beam is delimited by a horizontal interlayer thinning from East to West, hanging to the roof of the cave at the west and east-clamped in the rock mass. Opened fractures can be observed all around the beam. In order to assess the remaining hazard, 4 fissurometers (F1 to F4) and a thermal probe were installed on the roof of the cave and two borehole extensometers (D1 and D2) were drilled perpendicular to the face of the cliff, above the cave, to understand the global behaviour of the rock mass.
The four fissurometers were positioned around the remaining beam to quantify the aperture of the joints, in order to evaluate the relative movement of the blocks, according to changes in external conditions: F1 near the east-clamped end of the beam, and the three others on the west part: Two of them (F3 and F4) were fixed across a horizontal joint and a vertical joint respectively, F2 is positioned across the vertical joint in a 45° angle. The thermal probe was fixed on the roof of the cavity near the three. Fissurometers are LVDT strain gauges that measure displacements between their two extremes with a resolution of 1/10 th mm. LaRG20102021_fissurometer.xlsx gives a record per hour.
The borehole extensometers (D1 & D2) are RockTest / Télémac distofor@ anchored in the rock mass at the end of the borehole at a depth of 8 m from the cliff wall. Both were prepared with three displacement measuring points at depths of 2 m, 4 m and 6 m from the cliff wall and temperature measuring points at 2 m and 6 m depth. The supplier gives a measuring range of 100 mm, a resolution lower than 0.01 mm. Given the length of the rods used (8 m), the precision is about 0.05 mm. The operating temperature must remain between 0° and 50 °C. The devices were placed perpendicular to the rock face, about 4 m and 7.5 m above the roof of the cave cavity (see Gasc-Barbier et al. 2021). LaRG20102021_disto.xlsx gives a record per hour.
Measurements lasts between July 2010 until April 2015. They were stopped when reinforcement works were proceeded in the cave in order to secure the village.

Gasc-Barbier, M., Merrien-Soukatchoff, Virely, D. 2021. The role of natural thermal cycles on a limestone cliff mechanical behavior. Eng Geol. DOI 10.1016/j.enggeo.2021.106293.
Gasc-Barbier et al, 2020 https://doi.org/10.1051/geotech/2020013
Gasc-Barbier, M., Virely, D., Guittard, J., 2015. Thermal fatigue in rocks- la roque-gageac’ case study, in: 13th ISRM International Congress of Rock Mechanics. Montreal, Canada.

本数据集收录了超过11年之久的石灰岩峭壁及其内部温度和位移记录。关于监测设备的详细描述可参阅（Gasc-Barbier等，2020，2015）一文，以下为简要概述。数据解释方法见Gasc-Barbier等（2021）。LaRG20102021_instrum.jpg图展示了危险区域。图中可见一座位于石灰岩峭壁上的悬壁洞穴，其部分屋顶已坍塌。洞穴顶部的不稳定横梁引人注目，该横梁由从东向西逐渐变薄的水平夹层界定，悬挂于洞穴顶部，并在东西两侧被岩石体夹持。周围可见多处张开裂缝。为评估剩余的潜在危害，于洞穴顶部安装了4个裂缝计（F1至F4）和一个热探头，并在洞穴上方、垂直于峭壁面处钻探了两个钻孔应变计（D1和D2），以了解岩石体的整体行为。四个裂缝计围绕剩余横梁布置，以量化裂缝的开度，从而评估根据外部条件变化而产生的块体相对运动：F1位于横梁的东端夹持处，其余三个位于西侧：其中两个（F3和F4）分别固定于水平裂缝和垂直裂缝上，F2则以45°角固定于垂直裂缝上。热探头固定于靠近三个裂缝计的洞穴顶部。裂缝计为LVDT应变计，可测量其两端之间的位移，分辨率为0.1毫米。LaRG20102021_fissurometer.xlsx提供了每小时的记录。钻孔应变计（D1 & D2）为RockTest / Télémac distofor@型，锚固于钻孔底部岩石体内，距离峭壁8米，钻孔内设有三个位移测量点，分别位于距峭壁2米、4米和6米处，以及两个温度测量点，分别位于2米和6米深度。供应商提供的测量范围为100毫米，分辨率低于0.01毫米。鉴于所用杆件长度（8米），精度约为0.05毫米。操作温度必须保持在0°至50°C之间。设备被放置在垂直于岩石面的位置，距离洞穴顶部约4米和7.5米（见Gasc-Barbier等，2021）。LaRG20102021_disto.xlsx提供了每小时的记录。测量时间从2010年7月持续至2015年4月。当对洞穴进行加固工作以确保村庄安全时，测量工作终止。Gasc-Barbier, M.，Merrien-Soukatchoff, Virely, D. 2021. 自然热循环对石灰岩峭壁力学行为的作用。Eng Geol. DOI 10.1016/j.enggeo.2021.106293。Gasc-Barbier等，2020 https://doi.org/10.1051/geotech/2020013。Gasc-Barbier, M.，Virely, D.，Guittard, J. 2015. 岩石的热疲劳——罗克-热雅克案例研究，在：第13届国际岩石力学大会。加拿大蒙特利尔。