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首页> 外文会议>Annual highway geology symposium >Case Histories on Mitigating Geologic Hazards in Mountainous Areas of California’s Intrastate Highway System
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Case Histories on Mitigating Geologic Hazards in Mountainous Areas of California’s Intrastate Highway System

机译：案例历史减轻加利福尼亚州内山区山区地质灾害的历史

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Maintenance of highways in the mountainous areas of California is challenged by a multitude of geologic hazards which include slumps (small scale rotational slides) and rock fall to deep seated failures comprised of landslides and rockslides. This paper primarily focuses on rock fall and the mitigation measures employed to reduce that hazard. Various options are available to the Engineering Geologist at Caltrans (California Department of Transportation) to mitigate rock fall hazards in a cost efficient yet professionally suitable basis. Mitigation options selected for this review consist of temporary solutions such as hand scaling (removal of loose rock on a slope surface with hand operated equipment) as well as permanent solutions such as grading, blasting and realignment. This paper will look at five locations, the rock fall hazards posed, and the measures employed to mitigate those hazards. The sites are presented from north to south and are situated in the Sierra Nevada and Basin and Range Geomorphic Provinces. The sites extend from Alpine County in the north through Kern County in the south, and from Inyo County in the east to Fresno County in the west. The locations include Highway 88 at Carson Pass where three projects have been performed to mitigate recurrent rock fall issues, as well as hand scaling of multiple slopes on Highway 198 east of Visalia to prevent weather induced rock fall. Other locations include an earthwork mitigation of a rockslide on Highway 168 east of Fresno; blasting to prevent a rockslide on Highway 180 in Kings Canyon, and realignment of Highway 190 at Towne Pass in Death Valley National Monument to mitigate recurrent rock fall. The locations have been chosen to show a range in mitigation options for rock fall related hazards on California’s highway transportation system in mountainous areas. Due to the short time frame (about 10 years) encompassed in this case history, as well as the localized area (primarily central and south Sierra), all mitigation methods currently employed by Caltrans could not be documented in this one area alone. Other mitigation options that are not discussed in this paper include wire mesh and cable net draperies, and flexible and rigid barriers.
机译：加利福尼亚山区山区的高速公路的维护受到多种地质危害的挑战，包括坍落度（小规模旋转幻灯片）和岩石落到了由滑坡和岩石滑坡组成的深层坐着的故障。本文主要侧重于岩石跌倒，采用缓解措施，减少这种危害。 Caltrans（加利福尼亚州运输部）的工程地质学家可以提供各种选择，以减轻岩石灾害的成本效率且专业合适的基础。为该评论选择的缓解选项包括临时解决方案，如手缩放（用手操作设备的斜坡表面上的松散岩石）以及诸如分级，爆破和重新调整等永久解决方案。本文将研究五个地点，岩石秋季危险提出，采用措施减轻这些危害。该地点从北到南颁发，位于塞拉尼亚达和盆地和盆地省份。该地点从南部的北北部的高山县延伸，从东方inyo县到了西部的弗雷斯诺县。该地点包括Carson Pass的88号高速公路，其中已经进行了三个项目，以减轻反复性岩石秋季问题，以及198年东部的高速公路上的多个斜坡的缩放，以防止天气诱导的岩石落下。其他地点包括弗雷斯诺东部168号高速公路上的岩石下的土工减缓;爆炸以防止在金峡谷180号高速公路上的岩石滑动，以及190年高速公路的调整，Towne在Death Valley国家纪念碑中降低了反复摇滚岩。已选择该地区显示加州在山区的高速公路运输系统上的岩石坠入灾害的缓解方案中的一个范围。由于在这种情况下历史上所包括的短时间（大约10年），以及本地化区域（主要是中央和南塞拉），CALTRANS目前雇用的所有缓解方法都无法单独记录在这一领域。本文未讨论的其他缓解选项包括电线网和电缆网帷幔，灵活且刚性障碍。

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