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A platform for research: civil engineering, architecture and urbanism
Collapsible loess area highway reinforced bridgehead roadbed and construction method
The invention discloses a collapsible loess area highway reinforced bridgehead roadbed and a construction method. The roadbed sequentially comprises a sand-doped lime-soil pile composite foundation, areinforced sand-doped lime-soil mattress layer, a reinforced sand-stone-ash-doped improved loess backfill layer, a composite geomembrane, a graded broken stone hardcore and a bridgehead approach slabfrom bottom to top. According to the sand-doped lime-soil pile composite foundation, sand-doped lime soil serves as a pile body material to be filled into pile holes in a layered mode. The reinforcedsand-doped lime-soil mattress layer is formed by mixing river sand, lime and loess in proportion to form a filler; bidirectional geogrids are evenly laid at the vertical interval of 0.2 m for reinforcement, the reinforced sand-gravel-ash-doped improved loess backfill layer is formed by mixing river sand, lime and loess in proportion to form filler, and bidirectional geogrids are evenly laid at the vertical interval of 0.6 m in the filling process. The bridgehead roadbed is high in compression resistance, tensile strength, shearing strength and stability, the problem of 'bridgehead bump' caused by differential settlement and deformation of the bridgehead roadbed can be eliminated to the maximum extent, and meanwhile, the water stability and the frost resistance of the bridgehead roadbed are enhanced.
本发明公开了一种湿陷性黄土地区高速公路加筋桥头路基及施工方法，路基由下至上依次包括掺砂灰土桩复合地基、加筋掺砂灰土褥垫层、加筋掺砂石灰改良黄土回填层，复合土工膜，级配碎石垫层和桥头搭板。掺砂灰土桩复合地基采用掺砂的灰土作为桩身材料分层填筑至桩孔中，加筋掺砂灰土褥垫层由河砂、石灰和黄土按比例混合组成填料，填筑中按竖向间距0.2m均匀铺设双向土工格栅进行加筋，加筋掺砂石灰改良黄土回填层由河砂、石灰和黄土按比例混合组成填料，填筑中按竖向间距0.6m均匀铺设双向土工格栅。此桥头路基的抗压、抗拉、抗剪强度及稳定性好，能最大限度的消除桥头路基的不均匀沉降和变形引起的“桥头跳车”问题，同时增强桥头路基的水稳及抗冻性能。
Collapsible loess area highway reinforced bridgehead roadbed and construction method
The invention discloses a collapsible loess area highway reinforced bridgehead roadbed and a construction method. The roadbed sequentially comprises a sand-doped lime-soil pile composite foundation, areinforced sand-doped lime-soil mattress layer, a reinforced sand-stone-ash-doped improved loess backfill layer, a composite geomembrane, a graded broken stone hardcore and a bridgehead approach slabfrom bottom to top. According to the sand-doped lime-soil pile composite foundation, sand-doped lime soil serves as a pile body material to be filled into pile holes in a layered mode. The reinforcedsand-doped lime-soil mattress layer is formed by mixing river sand, lime and loess in proportion to form a filler; bidirectional geogrids are evenly laid at the vertical interval of 0.2 m for reinforcement, the reinforced sand-gravel-ash-doped improved loess backfill layer is formed by mixing river sand, lime and loess in proportion to form filler, and bidirectional geogrids are evenly laid at the vertical interval of 0.6 m in the filling process. The bridgehead roadbed is high in compression resistance, tensile strength, shearing strength and stability, the problem of 'bridgehead bump' caused by differential settlement and deformation of the bridgehead roadbed can be eliminated to the maximum extent, and meanwhile, the water stability and the frost resistance of the bridgehead roadbed are enhanced.
本发明公开了一种湿陷性黄土地区高速公路加筋桥头路基及施工方法，路基由下至上依次包括掺砂灰土桩复合地基、加筋掺砂灰土褥垫层、加筋掺砂石灰改良黄土回填层，复合土工膜，级配碎石垫层和桥头搭板。掺砂灰土桩复合地基采用掺砂的灰土作为桩身材料分层填筑至桩孔中，加筋掺砂灰土褥垫层由河砂、石灰和黄土按比例混合组成填料，填筑中按竖向间距0.2m均匀铺设双向土工格栅进行加筋，加筋掺砂石灰改良黄土回填层由河砂、石灰和黄土按比例混合组成填料，填筑中按竖向间距0.6m均匀铺设双向土工格栅。此桥头路基的抗压、抗拉、抗剪强度及稳定性好，能最大限度的消除桥头路基的不均匀沉降和变形引起的“桥头跳车”问题，同时增强桥头路基的水稳及抗冻性能。
Collapsible loess area highway reinforced bridgehead roadbed and construction method
一种湿陷性黄土地区高速公路加筋桥头路基及施工方法
HE XIONGJUN (author) / DU YANG (author) / HE JIA (author) / CAI WANG (author) / ZHU ANDONG (author) / WU WEIWEI (author) / ZENG ZHIYUAN (author) / ZHOU HUIDONG (author) / LIU XIAOWU (author)
2020-08-18
Patent
Electronic Resource
Chinese
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