Geotechnical investigations of sandy seafloors using dynamic penetrometers
Geotechnical investigations of sandy seafloors using dynamic penetrometers
复制标题
使用动态贯入仪对沙质海底进行岩土工程调查
作者：
N. Stark;A. Kopf;H. Hanff;S. Stegmann;R. Wilkens
最浅海底沉积物强度的岩土原位表征是近海工程中的一个重要因素（例如，风力发电厂的冲刷），海岸工程（例如，靠近海岸和海滩的沉积物侵蚀），海军应用（例如，地雷掩埋）和研究（例如，受潮汐影响地区的沙丘）。众所周知，动力沉积仪是一种节省时间和成本的手段，可用于现场获取沉积物物理特性，并检测浅海沉积物的分层或强度变化。然而，迄今为止，这种仪器很少用于硬桑迪海底，因为它们的穿透深度很小。本研究的目的是揭示如何适用于动态流速仪在沙子上，什么样的信息，他们可以提供。设备的减速-深度特征用于计算准静态承载能力，并与矿物成分、粒度分布和沉积分层等控制参数相关。
Geotechnical in-situ characterization of the strength of the shallowest sub-seafloor sediment is an important factor in offshore engineering (e.g., scouring at wind energy plants), coastal engineering (e.g., sediment erosion close to the shores and beaches), navy applications (e.g., mine burial) and research (e.g., dunes in tide-affected areas). Dynamic penetrometers are well known as time- and cost-saving means to derive sediment physical properties in-situ and to detect layering or changes of strength of the shallow marine deposits. However, until now such instruments were rarely used on hard sandy seafloor because of their small penetration depth. The aim of this study is to unravel how applicable dynamic penetrometers are on sand and what kind of information they can deliver. Deceleration — depth signatures of the devices are used to compute quasi-static bearing capacity and related to governing parameters such as mineralogical composition, grain size distribution and sedimentary layering.