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On slope stability of expansive soil canal of Middle Route Project of S-N Water Transfer and countermeasures

BAO Cheng gang(Changjiang Scientific Research Institute, Changjiang Water Resources Commission, Wuhan 430010,China)  
The failure mechanism of unsaturated expansive soil slope is analyzed emphatically. Under the condition of rainfall infiltration, shallow layer expansive soil slide occurs frequently and this kind of slide mechanism is different from that of saturated soil. In order to make the mechanism of expansive soil slide clear, a large scale of artificial rainfall experiment was carried out near the canal area of Middle Route Project of S-N Water Transfer and meaningful conclusion was obtained. It was concluded that the stability verification results of unsaturated expansive soil slope by the method usually used for the stability analysis of saturated expansive soil is over safe for deep layer but insufficient for shallow layer, therefore, it is not applicable. According to the failure mechanism of unsaturated expansive soil slope, the countermeasures to prevent shallow layer soil slide are suggested.
【CateGory Index】: TV223
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