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Lines in lahar

机译：在拉哈尔行

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The neighbouring bores on the Pando-Monte Lirio-EI Alto hydro cascade scheme in Panama were set to present the possibilites for unsual challenges for TBMs. The geology consists of highly variable lahar volcanic rock, an uncommon barrier for shields to penetrate. There was potential for quite different experiences within as well as between the drives, and that has proved to be so as excavation has started. Where the lahar so far has been good, on Pando, there has been the benefit of consistent progress for tunnelling contractor and TBM manufacturer Seli in the west of the country. The Italian firm supplied three TBMs and crews for the three projects in the Chiriqui Viejo Valley where Pando and Monte Lirio are being built just upstream of El Alto, which has a different developer (see figure 1, below). All three projects are being constructed under very long, 50-year, concessions, awarded by Autoridad Nacional de los Servicos Publicos (ASEP). Seli supplied three mixed-face EPBMs under two separate contracts for the projects, which will see a total of almost 16.5km of tunnel boring through lahars.
机译：巴拿马Pando-Monte Lirio-EI Alto水电梯级计划中的相邻钻孔将为可能出现的TBM带来挑战。地质学由高度变化的拉哈尔火山岩组成，这是盾牌穿透的罕见障碍。驱动器内部和驱动器之间可能会出现完全不同的体验，并且事实证明，这种挖掘已经开始。到目前为止，在潘多（Pando）表现良好的地区，隧道承包商和TBM制造商Seli在该国西部一直取得了持续进步。这家意大利公司为Chiriqui Viejo谷地的三个项目提供了三个TBM和工作人员，Paldo和Monte Lirio都在El Alto的上游建造，后者有不同的开发商（请参见下图1）。这三个项目都是由Autoridad Nacional de los Servicos Publicos（ASEP）授予的，为期50年的长期特许权。 Seli在两个单独的合同下为该项目提供了三台混合式EPBM，这将使总共约16.5公里的隧道钻通拉哈尔。

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