四川南部城市群主要环境工程地质问题

Main Problems of Environmental Engineering Geology in Southern Sichuan City Group

四川南部城市群为成渝经济区区域规划中四大城市群之一,有望成为四川省第二大增长极。区内多为丘陵山地型城市,有限的发展空间迫使城市建设活动中频繁的削坡、回填,在获得发展空间的同时也引发了大量的环境工程地质问题。地震活动、红层风化,地质灾害是区内最主要的环境工程地质问题。通过分析前人研究成果结合收集资料分析得出:华(?)山断裂及荥经-马边-盐津断裂在区内均表现为强活动性,地震活动频繁。侏罗系-白垩系红层泥岩具有快速风化的特性,红层边坡具有剥落、崩塌、落石、表层溜塌、滑塌、浅层滑坡六大破坏方式。区内地质灾害频发,发育密度达7.81处/100km^2,地质灾害类型以滑坡、崩塌为主。

Southern Sichuan city group is one of the four city groups in Cheng-Yu economic zone. Most of cites are constructed in hill and beyond the rivers. The limited developing space force cutting slope and backfill in the city construction activities frequently. Lots of problems are triggered along with the city development. Seismic activity, red-bed weathering and geological hazard are the major problems of environmental engineering geology in southern Sichuan city group. Huayingshan fault and Yingjing- Mabian-Yanjin fault are strongly active in this area. Jurassic and Cretaceous red-bed mudstones are of fast weathering. The red-bed slope has six failure types, including weathering spalling, rockfall, collapse, topsoil slip, slump and shallow landslide. Landslide and rockfall are the major geological hazards in southern Sichuan city group, the distribution density reach to 7.81 per one hundred square kilometers.