三河尖矿井表土段,含粘土共九层,厚度1.6～16.9米,累计厚105.63米,占表土层总厚49％。最下-层为垂深188.57～205.47米,厚16.9米。岩性为灰白色为主,局部有灰绿,桔黄色,上下部质柔韧致密,可塑性强,具有滑面,失水易碎,膨胀特强。该矿主、付、风三个井筒表土段均采用冻结法施工。在膨胀粘土段三个井筒现浇混凝土 The topsoil section of Sanhejian Mine contains a total of nine layers of clay with a thickness of 1.6-16.9 meters and a cumulative thickness of 105.63 meters, accounting for 49% of the total thickness of the topsoil. The lowest layer is 188.57 ~ 205.47 meters deep, 16.9 meters thick. Lithology is mainly white gray, local gray green, orange, upper and lower tender and flexible, strong plasticity, with sliding surface, water loss fragile, particularly strong expansion. The main mine, pay, the wind three wellbore surface sections are frozen construction. Three wellbore cast-in-place concrete in expansive clay section