高速铁路技术
高速鐵路技術
고속철로기술
HIGH SPEED RAILWAY TECHNOLOGY
2014年
4期
41-47
,共7页
山区铁路%路基工程%高陡边坡%不良地质体
山區鐵路%路基工程%高陡邊坡%不良地質體
산구철로%로기공정%고두변파%불량지질체
mountain railway%subgrade engineering%high and steep slope%unfavorable geologic body
大理西站位于西耳河右岸，属典型的剥蚀中山峡谷地貌。地震烈度高，地形、地质条件极其复杂，路基工程修建难度大是本站路基工程设计最大的特点。在地震烈度高达8度的短短1 km范围的路基工程，受1条区域大断层及2条支断层的影响，不良地质及特殊岩土发育有泥石流、滑坡、岩堆、顺层、危岩落石、人工坑洞、陡坡人工弃土等不良地质体。针对如此复杂的地形、地质条件，路基工程灵活采用环形柔性防护网，锚索(杆)框架梁轻型柔性加固防护技术，土钉墙原位加固技术，锚索桩板墙加锚索框架梁，桩基托梁衡重式挡墙等新型组合式支挡结构，实现了工程结构设计合理的多样化、组合化、新型化、轻型化、柔性化的工程设计理念。在技术方案研究中“总体着眼、专业入手冶并突出路基工程系统风险控制，合理选择了明洞方案穿过泥石流沟，适当缩短了地震时难以修复的傍山桥工程，做到了工程选择合理化、综合化、系统化。
大理西站位于西耳河右岸，屬典型的剝蝕中山峽穀地貌。地震烈度高，地形、地質條件極其複雜，路基工程脩建難度大是本站路基工程設計最大的特點。在地震烈度高達8度的短短1 km範圍的路基工程，受1條區域大斷層及2條支斷層的影響，不良地質及特殊巖土髮育有泥石流、滑坡、巖堆、順層、危巖落石、人工坑洞、陡坡人工棄土等不良地質體。針對如此複雜的地形、地質條件，路基工程靈活採用環形柔性防護網，錨索(桿)框架樑輕型柔性加固防護技術，土釘牆原位加固技術，錨索樁闆牆加錨索框架樑，樁基託樑衡重式擋牆等新型組閤式支擋結構，實現瞭工程結構設計閤理的多樣化、組閤化、新型化、輕型化、柔性化的工程設計理唸。在技術方案研究中“總體著眼、專業入手冶併突齣路基工程繫統風險控製，閤理選擇瞭明洞方案穿過泥石流溝，適噹縮短瞭地震時難以脩複的傍山橋工程，做到瞭工程選擇閤理化、綜閤化、繫統化。
대리서참위우서이하우안，속전형적박식중산협곡지모。지진열도고，지형、지질조건겁기복잡，로기공정수건난도대시본참로기공정설계최대적특점。재지진열도고체8도적단단1 km범위적로기공정，수1조구역대단층급2조지단층적영향，불량지질급특수암토발육유니석류、활파、암퇴、순층、위암낙석、인공갱동、두파인공기토등불량지질체。침대여차복잡적지형、지질조건，로기공정령활채용배형유성방호망，묘색(간)광가량경형유성가고방호기술，토정장원위가고기술，묘색장판장가묘색광가량，장기탁량형중식당장등신형조합식지당결구，실현료공정결구설계합리적다양화、조합화、신형화、경형화、유성화적공정설계이념。재기술방안연구중“총체착안、전업입수야병돌출로기공정계통풍험공제，합리선택료명동방안천과니석류구，괄당축단료지진시난이수복적방산교공정，주도료공정선택합이화、종합화、계통화。
Dali West Station is located on the right bank of Xi'er River that belongs to the typical denuded ravine land-form. The design of subgrade is strongly featured by high seismic intensity, extremely complicated landform and geology. This subgrade works in the range of only 1 km, where the seismic intensity reaches 8 degree, are impacted by a large re-gional fault and two branch faults. Unfavorable geology and special geotechnical development include mud-rock flow, landslide, talus, bedding, overhanging rock and rock fall, pothole and steep hill spoil. In view of such complex land-form and geology, annular protecting net, lightweight and flexible reinforcement and protection technology of anchor ( rockbolt) ,in-situ reinforcement technology of soil nailing wall, slab-pile wall with anchor and frame beam with anchor, weight balanced retaining wall on the supported beam of pile foundation and other new combined retaining structures are adopted for subgrade works to realize the engineering design ideas of diversity, combination, new type orientation, light-weight trend and flexibility. In the study of the technical proposals, we focus on the overall things and start with the spe-cialties. Besides, systematic risk control of subgrade construction is highlighted, and open-cut tunnel is reasonably cho-sen for passing mud-rock flow gully, which greatly reduces the renovation construction of bridges by the side of mountains. Rationalization, integration and systematization of engineering choice are achieved.
