Research on Engineering Characteristics and Treatment of Expansive Soil in Subgrade on Chong-shang Second-grade Highway
|Course||Road and Railway Engineering|
|Keywords||Compacted expansive soils Discrimination and classification Deformation and strength Slope stability Improved Treatment|
Expansive soil as a special nature of clay , has widely distributed around the world and most of our region . In recent years, with the rapid development of China's national economy , a large number of high-grade highway construction , a lot of high-grade highways across the development areas of expansive soils . Since the expansion of the soil with water volume expansion , dehydration shrinkage cracking , poor engineering properties of subgrade can cause serious Subgrade Disease , and should not be directly used as roadbed filler . However , if simple the abandoned side processing , will increase the project cost , at the same time a large number of abandoned side along the road will pollute the surrounding environment is not conducive along environmental protection , and therefore is placed in front of the majority of our road builders a more expansive soil subgrade urgent task. To Guangxi Chongzuo first to think of two road construction projects as the basis, on the basis of on-site soil investigation , adverse expansive soil engineering properties of expansive soils Experimental Study . This paper, conventional highway engineering test indicators and SOM neural network model for identification and classification of expansive soils , reasonable assurance as to the level of expansive soil expansion and contraction along the highway , and verified by experiment . By extensive experimental research , to establish a quantitative relationship between the compacted expansive soil samples expansion deformation, swelling force and shear strength of the soil samples initial water content , dry density and pressure of the overlying as expansive soil slope the basis of stability analysis . Consider water content and expansion limit analysis of the stability of expansive soil slope safety factor formula is deduced , and the corresponding calculation . Experimental study of the physical and mechanical properties of expansive soils in different mixed with cement , mixed with sand , mixed with good soil proportion conditions , analysis of the variation of the nature of the engineering indicators under different mixing ratio and water content conditions , to determine the economic rational improved program, construction technology , construction , control measures provide a basis . The the geotextile cloth cover law and sandwiches interbedded law paving the test road . By tracking survey and performance testing , evaluate the actual effect of the test road test road site . Comprehensive analysis of expansive soil improved economic reinforcement , the results show that : the use of the the geotextile cloth cover method and sandwiches interbedded law subgrade Using , has obvious economic and social benefits .