外文翻譯 --壓實處理對天然黃土力學(xué)性能的影響（英文）

1、 INFLUENCE OF FRACTURE FILLING ON MECHANICAL BEHAVIOR OF LOESS Mingjing Jiang1, Haijun Hu2, Jianbing Peng3, and Xinxin Wang4 1Professor, Department of Geotechnical Engineering, Tongji University, Shanghai, 200092, Chin

2、a; mingjing.jiang@#edu.cn 2Ph.D Candidate, Department of Geotechnical Engineering, Tongji University, Shanghai, 200092, China; hu.hai-jun@163.com 3Dean, School of Geological Engineering and Surveying, Chang’an

3、University, Xi’an, Shanxi, 710054, China; dicexy_1@chd.edu.cn 4Master Candidate, Department of Geotechnical Engineering, Tongji University, Shanghai, 200092, China; wangtian753214@163.com ABSTRACT: Natural loess and n

4、atural loess with filling at ground fissures in Jingyang, Shanxi province, China, were experimentally studied to investigate the effect of crack filling on the mechanical behavior of loess and the crack development by

5、 conventional triaxial compression test (CTC), reduced triaxial compression test (RTC) and reduced triaxial extension test (RTE) under constant water content condition. The tests were carried out at the consolidation p

6、ressure near in-situ stress. Different failure types were observed in the tests. In the CTC test, each soil demonstrates strain-hardening behaviour and shear failure plane is the interface between loess and filling fo

7、r the natural loess with filling sample. In RTC test, each soil behaves strain-softening. Shear failure planes are conjugate planes for the loess sample and shear failure plane is the interface between loess and fillin

8、g for the natural loess with filling sample. In RTE test, rupture is observed and the failure surface does not cross the filling for natural loess with filling, that is, the failure surface lies in loess totally. The

9、shear strength of loess with filling is almost the same as that of loess. INTRODUCTION A large number of ground fissures have been found in loess in China, especially in the Shanxi Province (Wang et al. 1989; Peng et a

10、l. 1992; Li et al.2000; Zhao et al.2009). Mechanical and physical properties of soils around ground fissure have been studied (Lu et al. 2009; Hu et al 2009). Lu et al. (2009) experimentally studied loess with filling

11、 by conventional triaxial compression tests and found that stress-strain relation changes from strain-softening to strain-hardening with the increase of consolidation pressure. The shear band often appears at the inter

12、face between loess and filling for the sample with the inclination angle of filling ?=60? under low consolidation pressure and the 117Pavement and Geotechnical Engineering for Transportation Downloaded from ascelibrary.

13、org by Tongji University on 02/05/15. Copyright ASCE. For personal use only; all rights reserved.SPECIMEN PREPARATION AND CHARACTERISTICS OF THE TESTED SOILS Sampling location and preparation of specimens The soils use

14、d in this research are natural loess and natural loess with filling at ground fissures in Jingyang, China. Blocks of samples were collected by the cutting method after stepped exploratory trenches had been excavated. F

15、ig.1 presents the cross section of geology, the distribution of fissures and the sampling location. The big dark region in bottom left of the map is big crack filling, which may forms after earthquake. Other fissures

16、form due to tension stress in horizontal direction after the formation of the big crack filing. These fissures are nearly vertical, and the width of fissures is about 1mm-200mm and decreases with depth. Loess sample co

17、ntaining fracture filling was collected at f12 (fissure 12) in depth of 10.5 m. The loess is Q3 loess (Malan loess) and the color is yellow. Filling about 5-7 mm in width exists in the sample of loess as illustrated i

18、n Fig.2. Natural loess specimens and natural loess with filling specimens were prepared for the triaxial test. And the angle between the plane of filling in loess and the end plane of specimen is 45? for triaxial sampl

19、es of loess with filling. Conventionally, the direction in which stress reduced is horizontal during excavation and construction of tunnel. The sampling direction is shown in Fig.3. For the CTC and the RTC samples, the

20、 sampling direction is nearly vertical. For the RTE samples, the sampling direction is horizontal. This can ensure the direction in which stress reduced is almost the same for the RTC test and the RTE test. During the

21、 specimen preparation, the initial water content of each specimen was measured. After preparation, the specimen was wrapped up in the plastic film and placed in the moist chamber. The water content of the specimen was

22、adjusted to 15% by air-drying the specimen or adding water to the specimen after its initial water content was known. Then the specimen was wrapped up in the plastic film again and stayed in the moist chamber for more

23、 than two days in order to ensure that the water distributes evenly in the sample. Many researchers (Zhang et al. 2006; Yang et al.2010) adopt this method to obtain the loess sample with specific water content. FIG. 1.

24、 Sampling location, geological FIG. 2. Collected sample profile and distribution of fissures FillingGEOTECHNICAL PRACTICE PUBLICATION NO. 8 119Pavement and Geotechnical Engineering for Transportation Downloaded f