APPLICATION RESEARCH ON BAMBOO OF SUBGRADE IN PRELIMINARY ENGINEERING FOR DRILLING
ZHANG Lingling1，WEN Hua1，ZHANG Zhiwei2
(1. School of Civil Engineering and Architecture，Southwest University of Science and Technology，Mianyang，Sichuan 621010，China；2. School of Civil Engineering，Southwest Jiaotong University，Chengdu，Sichuan 610031，China)
Abstract：The road of preliminary engineering for drilling is characterized by short period，overloading and subgrade diseases seriously. So the bamboo，as the reinforced material，is instead of geogrid used to improve the subgrade. The applicability of bamboo is verified by interfacial friction test and triaxial test of reinforced earth. At the same time，there is a comparative analysis between bamboo and geogrid. The results show that：(1) The tensile strength of bamboo is about 20 times higher than that of geogrid and the elastic modulus is about 30 times than that of geogrid，but the elongation of bamboo is only 1/6 times smaller than that of geogrid. It is satisfied for tensil strength as the reinforced material. (2) For the same amount reinforced earth，the interfacial friction strength of bamboo reinforced earth is bigger than that of geogrid reinforced earth. Because the surface roughness of bamboo is relatively higher than geogrid，its certain radian and thickness can provide lateral restraint for soil and its high tensil strength and low elongation has good stability and binding character. And more，iron wire using for bending bamboo can enhance the connect between bamboo and earth. (3) Peak strength and residual strength of bamboo reinforced earth can greatly improve and the peak strain interval increases comparing with geogrid. For the same strength，the strain value of bamboo reinforced earth is smaller than geogrid reinforced earth.
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2014, Vol. 33 
