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Microstructure of Compacted Loess and Its Influence on the Soil-Water Characteristic Curve

Microstructure of Compacted Loess and Its Influence on the Soil-Water Characteristic Curve Soil-water characteristic curve (SWCC) is a key constitutive relationship for studying unsaturated soil, and as is known, microstructure of the soil has great influence on the mechanical behaviour of the soil. In this study, the wetting and drying soil-water characteristic curves (SWCCs) of loess compacted at three different water contents were measured using the filter paper method. And microproperties of compacted loess were obtained by the mercury intrusion method (MIP) and scanning electron microscope (SEM). Results show that the compaction water contents have significant influence on the SWCC and microstructure. The pore size distribution (PSD) curves have great differences in macropore range and are similar in micropore range. Loess compacted at optimum and dry of optimum are generally connected, while there are certain number of nonintruded pores in loess compacted at wet of optimum. The SWCC curves vary significantly in low suction (<svg xmlns:xlink="http://www.w3.org/1999/xlink" xmlns="http://www.w3.org/2000/svg" style="vertical-align:-3.29111pt" id="M1" height="9.25202pt" version="1.1" viewBox="-0.0498162 -5.96091 12.2477 9.25202" width="12.2477pt"><g transform="matrix(.013,0,0,-0.013,0,0)"><path id="g113-118" d="M515 96L502 119C471 88 431 62 423 62C416 62 411 70 417 101C440 223 469 341 497 448H486L412 422L380 277C330 188 210 57 152 57C137 57 126 69 139 124L195 366C210 431 205 448 182 448C155 448 89 413 23 350L36 326C73 354 103 376 112 376C118 376 118 365 113 340L61 118C54 90 52 68 52 51C52 0 75 -12 98 -12S151 -3 181 17C242 58 305 119 362 193H364L345 104C323 3 339 -12 359 -12C390 -12 464 35 515 96Z"/></g><g transform="matrix(.0091,0,0,-0.0091,6.929,3.132)"><path id="g50-98" d="M490 97L476 124C442 96 405 70 398 70C392 70 390 78 396 114C419 243 448 379 463 432L457 436C446 436 431 439 418 442C393 447 368 451 343 451C281 451 204 418 155 381C74 320 24 206 24 107C24 23 59 -12 88 -12C118 -12 155 5 191 34C236 70 290 122 328 177H330L312 84C296 0 311 -12 331 -12C355 -12 425 24 490 97ZM374 387C371 367 360 299 347 264C323 202 187 53 142 53C128 53 113 73 113 120C113 224 157 332 221 380C241 395 274 403 303 403C330 403 360 395 374 387Z"/></g></svg> − <svg xmlns:xlink="http://www.w3.org/1999/xlink" xmlns="http://www.w3.org/2000/svg" style="vertical-align:-3.29111pt" id="M2" height="9.25202pt" version="1.1" viewBox="-0.0498162 -5.96091 14.1476 9.25202" width="14.1476pt"><g transform="matrix(.013,0,0,-0.013,0,0)"><use xlink:href="#g113-118"/></g><g transform="matrix(.0091,0,0,-0.0091,6.929,3.132)"><path id="g50-120" d="M698 334C698 397 680 451 655 451C627 451 602 424 602 397C602 389 605 383 614 371C622 360 624 340 624 317C624 161 546 47 458 47C419 47 389 69 389 125C389 142 391 162 397 185L457 430L451 435L380 421L315 164C301 107 266 47 222 47C182 47 153 69 153 126C153 137 157 162 161 185C166 214 179 265 197 334C203 358 208 385 208 407C208 433 201 451 176 451C124 451 64 404 24 348L44 320C86 366 113 382 121 382C126 382 128 381 128 374C128 368 126 356 122 341C102 266 88 204 81 164C77 143 73 121 73 107C73 23 131 -12 187 -12C234 -12 281 10 322 45C343 5 383 -12 422 -12C559 -12 698 174 698 334Z"/></g></svg> &lt; 1000 kPa) and tend to converge together in high suction (<svg xmlns:xlink="http://www.w3.org/1999/xlink" xmlns="http://www.w3.org/2000/svg" style="vertical-align:-3.29111pt" id="M3" height="9.25202pt" version="1.1" viewBox="-0.0498162 -5.96091 12.2477 9.25202" width="12.2477pt"><g transform="matrix(.013,0,0,-0.013,0,0)"><use xlink:href="#g113-118"/></g><g transform="matrix(.0091,0,0,-0.0091,6.929,3.132)"><use xlink:href="#g50-98"/></g></svg> − <svg xmlns:xlink="http://www.w3.org/1999/xlink" xmlns="http://www.w3.org/2000/svg" style="vertical-align:-3.29111pt" id="M4" height="9.25202pt" version="1.1" viewBox="-0.0498162 -5.96091 14.1476 9.25202" width="14.1476pt"><g transform="matrix(.013,0,0,-0.013,0,0)"><use xlink:href="#g113-118"/></g><g transform="matrix(.0091,0,0,-0.0091,6.929,3.132)"><use xlink:href="#g50-120"/></g></svg> ≥ 1000 kPa). Hysteresis in the SWCCs is more obvious for loess compacted at optimum and dry of optimum in the matric suction of 0∼100 kPa; however, there is a pronounced hysteresis for loess compacted at wet of optimum in full matric suction range. The characteristic of the SWCCs including their hysteresis can be well interpreted from the loess microstructure. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Advances in Materials Science and Engineering Wiley

Microstructure of Compacted Loess and Its Influence on the Soil-Water Characteristic Curve

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Publisher
Wiley
Copyright
Copyright © 2020 Xiao Xie et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
ISSN
1687-8434
eISSN
1687-8442
DOI
10.1155/2020/3402607
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Abstract

Soil-water characteristic curve (SWCC) is a key constitutive relationship for studying unsaturated soil, and as is known, microstructure of the soil has great influence on the mechanical behaviour of the soil. In this study, the wetting and drying soil-water characteristic curves (SWCCs) of loess compacted at three different water contents were measured using the filter paper method. And microproperties of compacted loess were obtained by the mercury intrusion method (MIP) and scanning electron microscope (SEM). Results show that the compaction water contents have significant influence on the SWCC and microstructure. The pore size distribution (PSD) curves have great differences in macropore range and are similar in micropore range. Loess compacted at optimum and dry of optimum are generally connected, while there are certain number of nonintruded pores in loess compacted at wet of optimum. The SWCC curves vary significantly in low suction (<svg xmlns:xlink="http://www.w3.org/1999/xlink" xmlns="http://www.w3.org/2000/svg" style="vertical-align:-3.29111pt" id="M1" height="9.25202pt" version="1.1" viewBox="-0.0498162 -5.96091 12.2477 9.25202" width="12.2477pt"><g transform="matrix(.013,0,0,-0.013,0,0)"><path id="g113-118" d="M515 96L502 119C471 88 431 62 423 62C416 62 411 70 417 101C440 223 469 341 497 448H486L412 422L380 277C330 188 210 57 152 57C137 57 126 69 139 124L195 366C210 431 205 448 182 448C155 448 89 413 23 350L36 326C73 354 103 376 112 376C118 376 118 365 113 340L61 118C54 90 52 68 52 51C52 0 75 -12 98 -12S151 -3 181 17C242 58 305 119 362 193H364L345 104C323 3 339 -12 359 -12C390 -12 464 35 515 96Z"/></g><g transform="matrix(.0091,0,0,-0.0091,6.929,3.132)"><path id="g50-98" d="M490 97L476 124C442 96 405 70 398 70C392 70 390 78 396 114C419 243 448 379 463 432L457 436C446 436 431 439 418 442C393 447 368 451 343 451C281 451 204 418 155 381C74 320 24 206 24 107C24 23 59 -12 88 -12C118 -12 155 5 191 34C236 70 290 122 328 177H330L312 84C296 0 311 -12 331 -12C355 -12 425 24 490 97ZM374 387C371 367 360 299 347 264C323 202 187 53 142 53C128 53 113 73 113 120C113 224 157 332 221 380C241 395 274 403 303 403C330 403 360 395 374 387Z"/></g></svg> − <svg xmlns:xlink="http://www.w3.org/1999/xlink" xmlns="http://www.w3.org/2000/svg" style="vertical-align:-3.29111pt" id="M2" height="9.25202pt" version="1.1" viewBox="-0.0498162 -5.96091 14.1476 9.25202" width="14.1476pt"><g transform="matrix(.013,0,0,-0.013,0,0)"><use xlink:href="#g113-118"/></g><g transform="matrix(.0091,0,0,-0.0091,6.929,3.132)"><path id="g50-120" d="M698 334C698 397 680 451 655 451C627 451 602 424 602 397C602 389 605 383 614 371C622 360 624 340 624 317C624 161 546 47 458 47C419 47 389 69 389 125C389 142 391 162 397 185L457 430L451 435L380 421L315 164C301 107 266 47 222 47C182 47 153 69 153 126C153 137 157 162 161 185C166 214 179 265 197 334C203 358 208 385 208 407C208 433 201 451 176 451C124 451 64 404 24 348L44 320C86 366 113 382 121 382C126 382 128 381 128 374C128 368 126 356 122 341C102 266 88 204 81 164C77 143 73 121 73 107C73 23 131 -12 187 -12C234 -12 281 10 322 45C343 5 383 -12 422 -12C559 -12 698 174 698 334Z"/></g></svg> &lt; 1000 kPa) and tend to converge together in high suction (<svg xmlns:xlink="http://www.w3.org/1999/xlink" xmlns="http://www.w3.org/2000/svg" style="vertical-align:-3.29111pt" id="M3" height="9.25202pt" version="1.1" viewBox="-0.0498162 -5.96091 12.2477 9.25202" width="12.2477pt"><g transform="matrix(.013,0,0,-0.013,0,0)"><use xlink:href="#g113-118"/></g><g transform="matrix(.0091,0,0,-0.0091,6.929,3.132)"><use xlink:href="#g50-98"/></g></svg> − <svg xmlns:xlink="http://www.w3.org/1999/xlink" xmlns="http://www.w3.org/2000/svg" style="vertical-align:-3.29111pt" id="M4" height="9.25202pt" version="1.1" viewBox="-0.0498162 -5.96091 14.1476 9.25202" width="14.1476pt"><g transform="matrix(.013,0,0,-0.013,0,0)"><use xlink:href="#g113-118"/></g><g transform="matrix(.0091,0,0,-0.0091,6.929,3.132)"><use xlink:href="#g50-120"/></g></svg> ≥ 1000 kPa). Hysteresis in the SWCCs is more obvious for loess compacted at optimum and dry of optimum in the matric suction of 0∼100 kPa; however, there is a pronounced hysteresis for loess compacted at wet of optimum in full matric suction range. The characteristic of the SWCCs including their hysteresis can be well interpreted from the loess microstructure.

Journal

Advances in Materials Science and Engineering – Wiley

Published: Jan 8, 2020

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