宁夏固原地区泥岩工程特性试验研究

为研究宁夏固原地区饮水工程中泥岩的工程特性,对该地区泥岩进行了基本物理试验、耐崩解性试验、膨胀性试验和单轴压缩试验.试验结果表明:二次循环耐崩解系数为77%⁹2%,而且随着泥质矿物含量的增加,耐崩解系数逐渐降低;轴向膨胀率约是径向膨胀率的2.9倍,且二者均比较离散;侧限膨胀率的范围为1.01%92%,而且随着泥质矿物含量的增加,耐崩解系数逐渐降低;轴向膨胀率约是径向膨胀率的2.9倍,且二者均比较离散;侧限膨胀率的范围为1.01%⁴.40%;膨胀力一般为104.40%;膨胀力一般为10⁴0 kPa,膨胀力离散性比较大;天然状态和饱和状态泥岩的抗压强度都比较低,属于软岩;在饱和状态下,该地区泥岩的抗压强度骤降约75%;岩样的泊松比在天然状态下比饱和状态下小,天然状态下的弹性模量约是饱和状态下的2.5倍.

Experimental Study on the Engineering Characteristics of the Mudstone in Guyuan Area,Ningxia Province

To research the engineering characteristics of the mudstone in Guyuan area of Ningxia, the mudstone in the region is made the basic physical test, the resistance to disintegration test, the swelling test and the uniaxial compression test. The test results show that： the secondary loop resistance disintegration coefficient is from 77% to 92% , and the resistance disintegrating coefficient gradually reduces with the content of the argillaceous minerals increasing; axial expansion rate is about 2.9 times than the radial, and the both are relatively discrete; unconfined expansion rate is generally from 1.01% to 4.40% ; expansion force in general is from 10 kPa to g0 kPa, and has a relatively large discreteness; the compressive strength of the mudstone in both the natural and saturated state is very low, it is classified as soft rock; in the saturated state, the compressive strength of the mudstone in the region plunges about 75% ; and the Poisson＇s ratio in the natural state is smaller than that in the saturated state, the elastic modulus in the natural state is 2.5 times than that in the saturated state.