毛乌素沙漠风积砂动强度特性试验研究

随着陕北油气资源的不断勘探和开发，毛乌素沙漠地区风积砂的岩土工程特性问题逐渐成为当地工程建设的制约因素。该文在均等固结条件下，采用孔压破坏标准，对毛乌素沙漠饱和风积砂进行了不同干密度和不同围压下的固结不排水等幅循环动三轴强度试验。在试验基础上，得到了不同密度不同围压下的风积砂动强度曲线和动孔隙水压力发展曲线。针对天然气压缩机的类无限循环动荷载特性，探讨了无限循环荷载作用下毛乌素沙漠饱和风积砂的动强度问题。并基于摩尔-库仑强度准则获得了适用于毛乌素沙漠风积砂在无限循环荷载作用下的等效动抗剪强度参数及破坏判据。

STUDY ON DYNAMIC STRENGTH OF THE AEOLIAN SAND IN MAOWUSU DESERT AREA

With the continuous exploration and development of oil and gas resources in Northern Shaanxi,the geotechnical characteristics of Maowusu Desert Aeolian sand has gradually become a problem haltering local engineering construction.This paper conducted consolidated undrained dynamic triaxial strength tests of the Maowusu Desert saturated Aeolian sand with different dry densities and confining pressures;The tests were made under isotropic consolidation condition,and pore water pressure failure criterion was used.Based on the experimental results,the dynamic strength curves and the dynamic pore water pressure developing curves were obtained.Considering the infinite loop dynamic load feature of natural gas compressor,the equivalent dynamic shear strength parameters were obtained and the corresponding failure criterion was established based on Mohr-Coulomb criterion.