Guilai Highway Resign Research Of Guangxi In Expansive Soil Area

Guangxi is China’s expansive soil a wide distribution area, expansive soil properties alsohave bigger difference, because expansion land section roadbed design unreasonable land to theexpansion of the highway construction and maintenance bring great losses. So the guangxiexpansive soil area roadbed design has the very vital significance.This paper guangxi area of natural climate condition, traffic and roadbed status, roadmaterials and roadbed damage characteristics, expansive soil region of guangxi in a highwaydesign. The conclusion is as follows:1. Guangxi expansive soil mainly divided into three categories, then press the formationand the lithology, each of the groups and can be divided into two subgroups. Guangxi expansivesoil mineral composition mainly by illite and kaolinite is given priority to, montmorillonitecontent is not much, its chemical composition is characteristic of high aluminium high iron, richpotassium, magnesium and calcium, poor silicon aluminium is quite high.2. Guangxi expansive soil area of the main diseases have roadbed: erosion, mud flow, slipand fall and smooth, landslide, subsidence, longitudinal crack, and the shoulder; and smooth.Cause guangxi highway roadbed disease causes damage of mainly in the following aspects:1)the roadbed incorrect design,2) the poor quality of construction,3) bad engineering geologicalconditions, effects of4) construction bad management. Roadbed of main disease slope slide isand roadbed and uneven settlement.3. The region of guangxi is often used in pavement and cushion of materials: of the cementstable macadam, two ash stabilized macadam, cement stabilized sand gravel, two ash stabilizedsand gravel, gradation rubble fill in the gap rubble, natural sandy gravel and gradation of gravel.4. Guangxi highway subgrade expansive soil as road bed packing, main modification orblunt rare materials processing, make the packing meet with requirements road. In theconstruction of the main content and content to ash slag, the processing method of the subgradeconstruction and the design of expansive soil moisture seepage control long considered up close,make the soil from external climate, rain water effects.5. Sure the general cross-sectional roadbed, embankment height, low light dug and high embankment fill sections and the bridge sets back the design scheme of roadbed, etc, and theexistence of expansive soil road design principles and scheme selection was conducted. To fill inthe excavated one protection engineering, design principles and road surface and pavementdrainage design principles of subgrade scheme than the election demonstrates.