【摘要】 沙漠的工程地质问题随工程类型的不同而不同。本文以输水工程为例,概要地论述了沙漠工程地质问题。风沙危害是沙漠中带有普遍性的问题,频繁而强劲的风力和地表充足的砂粒为风沙危害提供了条件;砂土湿陷性主要与其密度大小有关,当砂的干密度达到1 64g cm3时,湿陷性系数均小于0 015,即可消除湿陷性;渗透变形的形式为流土,破坏临界比降为0 9～1 73,属抗渗能力低的细粒砂土;天然沙漠砂为不冻胀砂,当含水量≤18%时为不冻胀—弱冻胀砂,饱和时为冻胀砂;挖方形成的高边坡在风蚀作用下使坡面增长,裸砂面积加大,加剧对渠道的淤积。更多还原

【Abstract】 The diverse issues of engineering geology in a desert vary with the types of engineering. As an illustration of a water conducting engineering, some engineering geological issues in desert are briefly discussed in the paper. Harm of sand blown by wind is an issue with universality in desert. A strong wind power with high frequency and abundance of granulated sand are the reason to cause the harm. Because collapsibility of sand and soil is associated with density, only when a dry density is up to 1.64g/cm~3 and a coefficient of collapsibility is less than 0.015, the collapsibility can be eliminated. Flow soil is a deformation caused by seepage. The fine sandy soil whose critical ratio to wreck is between 0.9 to 1.73 has a low ability of anti-seeping. Natural sand in a desert is the sand with non-frost heaving. When water content is less than 18%, it is the sand with non-frost heaving to weak frost heaving and saturated sand is the sand with frost heaving feature. Due to a corrosion of wind a high slope caused by excavation will increase its sloping surface and exposed sand area, which will result in filling up in a water channel.更多还原