ISSN 2096-4498
CN 44-1745/U
Tunnel Construction ›› 2017, Vol. 37 ›› Issue (S2): 54-59.DOI: 10.3973/j.issn.2096-4498.2017.S2.008
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SUN Liangqian
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Abstract:
The Weihe Tunnel on BaojiLanzhou Passengerdedicated Line passes through the Neogene mudstone for a long distance in Tianshui, Gansu. The strength and stability of rock are poor and the infiltration of the river has great influence on the construction and operation of the tunnel. In order to put forward reasonable tunnel construction countermeasures, the compressive strength, compression deformation, expansibility, disintegration and water permeability of the Neogene mudstone in Tianshui, Gansu are carried out by laboratory tests. The results show that: 1) The Neogene mudstone is extremely soft, which is not expansibile but is with disintegration after water absorption. 2)The infiltration coefficient of the Neogene mudstone is very small, which belongs to the micropermeable stratum, and the water separation effect is good. During the tunnel construction, nonblasting excavation methods are recommended and the formation displacement is strictly controlled. The principle of strong support and early closure should be followed and the surrounding rock should not be soaked by construction water.
Key words: Neogene weak weathered mudstone, swelling, disintegration, water permeability
CLC Number:
U 45
SUN Liangqian. Experimental Study of Engineering Properties of Neogene Mudstone in Tianshui, Gansu[J]. Tunnel Construction, 2017, 37(S2): 54-59.
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URL: http://www.suidaojs.com/EN/10.3973/j.issn.2096-4498.2017.S2.008
http://www.suidaojs.com/EN/Y2017/V37/IS2/54