Study on the Effect of Isotropic Initial Stress on the Anchoring Performance of Self-Expanding Bolts by Jie Liu, Hongya Li, Yunzhou Li, Yunan Yang, Tao Sun, Rui Song, Rongqi Sun

“…The strong restraint of the sealing section of the anchor hole causes the anchor solid to form a “shuttle-shaped” microexpanded head with thin ends and a middle drum under the expansion stress. …”
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La gestion de l’eau à Bibracte (Saône-et-Loire), avant et après la Conquête romaine by Laetitia Borau

“…They have similar construction techniques: either they had a wooden casing (generally these are vertical beams with notches into which fit wooden boards) surrounded by a sealing of raw clay, or they were made of stone and were waterproofed by clay sealing, or they were constructed using a combination of several techniques. …”
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