Research on Soft Rocks for the Construction of Roadbeds for High-Speed Railroad: Effect of Water Soaking Environment

Author:

Zhang Xiangdong1,Geng Jie1ORCID,Xu Yuebo2,Zhou Zhongchao1,Pang Shuai1

Affiliation:

1. College of Civil Engineering, Liaoning Technical University, Fuxin, Liaoning 123000, China

2. China Railway Nine Bureau Group No. 4 Engineering Co.,Ltd., Shenyang, Liaoning 110000, China

Abstract

The strength of the roadbed composed of soft rock decreases following water immersion. Cement slurry is mixed with a soft rock to strengthen the soft rock roadbed to address this problem. The uniaxial compressive strength was determined, and the triaxial compression tests were conducted to analyze muddy sandstones mixed with different amounts of the cement slurry of the same composition. Some of the cured samples were soaked in water, and the samples were analyzed. The results were compared with the results obtained by analyzing unsoaked samples. The MIDAS/GTS NX software was used to develop a three-dimensional finite model to simulate the settlement patterns of roadbeds developed in the presence of natural water, saturated water, and muddy sandstone reinforcements. The experimental results have been presented and discussed. (1) When the filling rate corresponding to the cement slurry is 32%, the uniaxial compressive strength of muddy sandstone containing natural water reaches 3.32 MPa, which is approximately 5 times higher than the strength of muddy sandstone devoid of cement slurry. (2) The water absorption energy of the reinforced muddy sandstone was analyzed from the perspective of saturated water content. The water plugging effect observed after the addition of the cement slurry was studied, and the equations defining uniaxial compressive strength, elastic modulus, and free saturated water content were established. (3) An increase in the content of the cement slurry admixture resulted in a change in the nature of the partial stress–strain curves generated for muddy sandstone. The curve change from strain-hardening to strain-softening type and the deformation modulus and extent of cohesion realized increased exponentially with an increase in the cement slurry filling rate. A positive linear correlation was observed between the internal friction angle and the cement slurry filling rate. (4) An increase in the cement slurry filling rate corresponding to the saturated muddy sandstone resulted in an exponential decrease in the settlement deformation value. The vertical displacement decreased to 0.3497 mm when the grouting rate reached 32% under conditions of saturation. The deformation tended to converge and stabilize, indicating that the introduction of the admixture consisting of the cement slurry could help in effectively controlling the property of settlement deformation observed in the fully weathered muddy sandstone roadbed. The results helped in the scientific evaluation of the reinforcement effect. The reported results also helped develop a theoretical basis for the development of soft foundation reinforcement.

Funder

National Natural Science Foundation of China

Publisher

Hindawi Limited

Subject

General Engineering,General Materials Science

Reference21 articles.

1. Field Test on Controlled Grouting Technology for Soft Soil Subgrade of High-Speed Railway;X. N. Yang;Journal of Xi'an Jiaotong University,2018

2. Analysis of dynamic test load on filler of ballastless track subgrade of high speed railway;Q. Y. Wang;Railway Standard Design,2018

3. Construction technology of high-pressure jet-grouting pile for reinforcement of karst cavity soft foundation;Y. Z. Yang;CONSTRUCTION TECHNOLOGY,2021

4. Characteristic strength of cement-treated marine clay;F. Lee;Hazard Control in Tunnelling and Underground Engineering,2019

5. Experimental research on influentical factors of soft clay treated by cement;H. G. Fang;Resources Environment & Engineering,2013

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