(1. Department of Geotechnical Engineering，Tongji University，Shanghai 200092，China；2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education，Tongji University，Shanghai 200092，China；3. College of Water Conservancy and Hydropower Engineering，Hohai University，Nanjing，Jiangsu 210098，China；4. CCCC Highway Consultants Co.，Ltd.，Beijing 100088，China；5. Hong Kong-Zhuhai-Macao Bridge Authority，Zhuhai，Guangdong 519015，China)
Abstract：Determination of coefficient of subgrade reaction is the key to solve the engineering problems with load-structure method. In order to study the distribution characteristics and statistical parameters of layered soils foundation with variability，a calculation method with the compression modulus of each layer soil as the input parameter was derived based on the principle of consistent final settlement，and the variability of soil was considered with the aid of Monte Carlo method. Besides，the proposed method was realized by using Matlab software. The results were applied to the Hong Kong-Zhuhai-Macao immersed tunnel，and a two-dimensional analytical model was established based on the load-structure method. The following conclusions can be drawn: (1) The equivalent coefficients of subgrade reaction of the typical section K9+843 approximately obey normal distribution. The mean value is 985 kPa/m，and the coefficient of variation is 0.265. (2) The settlements of this section approximately obey logarithmic normal distribution when taking the variability of soils into consideration， which has a significant difference. (3) The settlements of this section are close to those obtained from three-dimensional analysis model based on stratum-structure method under the same condition，which validates the rationality of the proposed method to calculate the equivalent coefficient of subgrade reaction.
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2014, Vol. 33 
