This paper focuses on hydraulic-mechanical effects in the Mont Terri rock laboratory (Switzerland) and investigates their impact on pore pressure, the convergence of a niche and the evolution of pre-existing cracks in the wallrock of the niche. A comparison of measurements with numerical simulation results is conducted. The presented in situ measurements include long-term data on temperature, relative humidity, and niche convergence, as well as crackmeter and jointmeter measurements determining the aperture of a bedding-parallel crack. Furthermore, time-domain-reflectometry measurements were carried out in a borehole located in the niche wall close to the crack. They provide information on the water content of the claystone. The numerical simulation is carried out with OpenGeoSys. It contains a 2-dimensional coupled hydraulic-mechanical model considering orthotropy, swelling and shrinkage effects, linear elastic material behaviour and an excavation damaged zone characterized by a zone of lower rock strength. An additional focus is laid on the evolution of cracks in the wallrock of the niche. The presented model approach allows a prediction of the temporal evolution of a desaturated zone incorporating a seasonally influenced part. The comparison with measured water contents yields good agreement. Simulation results and measurements consistently predict a convergence of the niche. The evolution of the crack aperture is influenced by long-term as well as seasonallyinfluenced effects. Due to the convergence of the niche, the long-term trend is characterized by closure of the crack. Furthermore, the seasonally influenced desaturation in winter results in opening of the crack, while the resaturation in the warm and wet summer months leads to closure of the crack. Finally, the comparison of simulation results with measurements indicates qualitative agreement. As a matter of fact, the numerical model seems to represent significant effects concerning the evolution of the crack aperture of a single crack.

中文翻译：

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蒙特泰里岩石实验室（瑞士）中季节性诱发过程的水力-机械耦合模拟

本文重点研究了蒙特利岩石实验室（瑞士）中的水力-机械效应，并研究了它们对孔隙压力，小生境的收敛以及小生境围岩中预先存在的裂缝的演化的影响。将测量结果与数值模拟结果进行比较。提出的现场测量包括有关温度，相对湿度和生态位收敛的长期数据，以及确定平行平行裂缝孔径的裂缝计和接头计的测量值。此外，在位于靠近裂缝的壁iche壁中的钻孔中进行了时域反射测量。它们提供有关粘土岩含水量的信息。数值模拟是使用OpenGeoSys进行的。它包含二维耦合的水力-机械模型，其中考虑了正交各向异性，溶胀和收缩效应，线性弹性材料的行为以及以岩石强度较低的区域为特征的开挖损坏区域。另一个重点放在利基的围岩中裂缝的演变。提出的模型方法可以预测结合季节影响部分的不饱和带的时间演变。与测得的水含量进行比较可得出很好的一致性。仿真结果和测量结果一致地预测了利基市场的收敛性。裂纹孔的演变受长期以及季节性影响的影响。由于利基的收敛，长期趋势的特征是裂缝的闭合。此外，冬季受季节影响的去饱和会导致裂缝开裂，而在温暖潮湿的夏季月份会重新饱和，导致裂缝闭合。最后，仿真结果与测量结果的比较表明定性一致。实际上，数值模型似乎代表了有关单个裂纹的裂纹孔径演变的重大影响。