For basement construction in weathered mudstone in Melbourne, soldier piles and tensioned anchors are the usual support method. However, when the bedding is favourable, the highly jointed mudstone can often be excavated to form near vertical faces which remain relatively stable. The paper describes the support of a 20m deep basement excavation using both conventional support and also rock nails and shotcrete facing. A jointed rock model was used to confirm rock mass strength parameters adopted for design of the rock nails. Unfavourable bedding and the presence of a massive weak dyke structure prevented general use of the rock nail support system. Nevertheless, sufficient lengths of wall were successfully supported by the rock nails to demonstrate that this alternative means of retention is viable in highlyjointed rock, given suitable conditions.
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机译：用于消除后半部分热量的固定单元-具有可垂直移动的形状支撑的铰接式支架和夹紧机构AB FR2689373A固定装置。一块肉，颗粒状。后部悬挂用于去骨的四分之一由在一个围绕水平轴的上部铰接的托架组成，该托架具有至少一个用于肉面之一的支撑单元，以及至少一个作用在肉的相对面上的活动夹紧单元。支撑和夹紧系统均可垂直移动。后四分之一牛肉是优选的。通过将夹子直接放置在耻骨软骨关节下方来保持。使用/优点-可以将大块的肉悬空去骨。良好的操作条件可改善卫生状况。没有损坏切割设备的风险。鉴定得到改善。 AN 93379429 TI鲜鱼加工台-用于将托盘接收和排出到带有刺的工作站。和杂物输送机
